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Overview
Comment:linenoise: Update to support multiline mode.

Updated to: https://github.com/msteveb/linenoise/commit/ad5172e99520e2fe2a35b4bbd7fbc74d9df36df1

Now supports multiline mode (by setting $history::multiline to 1) Improved windows support

Signed-off-by: Steve Bennett <steveb@workware.net.au>

Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1:4f1592c24edf9b1ca46af19917a1ea8bb5bc8577
User & Date: steveb@workware.net.au 2018-03-25 00:47:53
Context
2018-06-03
06:18
jim.c: Jim_Length/Jim_String internal checks

Perform the same internal checks as Jim_GetString() when the string rep needs to be generated by calling Jim_GetString()

Reported-by: Stuart Cassoff <stwo@bell.net> Signed-off-by: Steve Bennett <steveb@workware.net.au> check-in: 876c29d3a8 user: steveb@workware.net.au tags: trunk

2018-03-25
00:47
linenoise: Update to support multiline mode.

Updated to: https://github.com/msteveb/linenoise/commit/ad5172e99520e2fe2a35b4bbd7fbc74d9df36df1

Now supports multiline mode (by setting $history::multiline to 1) Improved windows support

Signed-off-by: Steve Bennett <steveb@workware.net.au> check-in: 4f1592c24e user: steveb@workware.net.au tags: trunk

2018-01-18
01:01
expr: prevent stack overflow

Limit the depth of the expressions to a reasonable level to prevent stack overflow

Signed-off-by: Steve Bennett <steveb@workware.net.au> check-in: b878884ca8 user: steveb@workware.net.au tags: trunk

Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to jim-interactive.c.

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 * Returns an allocated line, or NULL if EOF.
 */
char *Jim_HistoryGetline(Jim_Interp *interp, const char *prompt)
{
#ifdef USE_LINENOISE
    struct JimCompletionInfo *compinfo = Jim_GetAssocData(interp, completion_callback_assoc_key);
    char *result;


    /* Set any completion callback just during the call to linenoise()
     * to allow for per-interp settings
     */
    if (compinfo) {
        linenoiseSetCompletionCallback(JimCompletionCallback, compinfo);
    }





    result = linenoise(prompt);
    /* unset the callback */
    linenoiseSetCompletionCallback(NULL, NULL);
    return result;
#else
    int len;
    char *line = malloc(MAX_LINE_LEN);







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 * Returns an allocated line, or NULL if EOF.
 */
char *Jim_HistoryGetline(Jim_Interp *interp, const char *prompt)
{
#ifdef USE_LINENOISE
    struct JimCompletionInfo *compinfo = Jim_GetAssocData(interp, completion_callback_assoc_key);
    char *result;
    Jim_Obj *objPtr;
    long mlmode = 0;
    /* Set any completion callback just during the call to linenoise()
     * to allow for per-interp settings
     */
    if (compinfo) {
        linenoiseSetCompletionCallback(JimCompletionCallback, compinfo);
    }
    objPtr = Jim_GetVariableStr(interp, "history::multiline", JIM_NONE);
    if (objPtr && Jim_GetLong(interp, objPtr, &mlmode) == JIM_NONE) {
        linenoiseSetMultiLine(mlmode);
    }

    result = linenoise(prompt);
    /* unset the callback */
    linenoiseSetCompletionCallback(NULL, NULL);
    return result;
#else
    int len;
    char *line = malloc(MAX_LINE_LEN);

Changes to jim_tcl.txt.

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6. Add scriptable autocompletion support with `history completion`
7. Add support for `tree delete`
8. Add support for `defer` and '$jim::defer'
9. Renamed `os.wait` to `wait`, now more Tcl-compatible and compatible with `exec ... &`
10. `pipe` is now a synonym for `socket pipe`
11. Closing a pipe open with `open |...` now returns Tcl-like status
12. It is now possible to used `exec` redirection with a pipe opened with `open |...`


Changes between 0.76 and 0.77
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1. Add support for `aio sync`
2. Add SSL and TLS support in aio
3. Added `zlib`
4. Added support for boolean constants in `expr`
................................................................................
The following variables have special meaning to Jim Tcl:

+*jim::defer*+::
    If this variable is set, it is considered to be a list of scripts to evaluate
	when the current proc exits (local variables), or the interpreter exits (global variable).
	See `defer`.






CHANGES IN PREVIOUS RELEASES
----------------------------

=== In v0.70 ===

1. +platform_tcl()+ settings are now automatically determined







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6. Add scriptable autocompletion support with `history completion`
7. Add support for `tree delete`
8. Add support for `defer` and '$jim::defer'
9. Renamed `os.wait` to `wait`, now more Tcl-compatible and compatible with `exec ... &`
10. `pipe` is now a synonym for `socket pipe`
11. Closing a pipe open with `open |...` now returns Tcl-like status
12. It is now possible to used `exec` redirection with a pipe opened with `open |...`
13. Interactive line editing now supports multiline mode if $::history::multiline is set

Changes between 0.76 and 0.77
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1. Add support for `aio sync`
2. Add SSL and TLS support in aio
3. Added `zlib`
4. Added support for boolean constants in `expr`
................................................................................
The following variables have special meaning to Jim Tcl:

+*jim::defer*+::
    If this variable is set, it is considered to be a list of scripts to evaluate
	when the current proc exits (local variables), or the interpreter exits (global variable).
	See `defer`.

+*history::multiline*+::
    If this variable is set to "1", interactive line editing operates in multiline mode.
	That is, long lines will wrap across multiple lines rather than scrolling within a
	single line.

CHANGES IN PREVIOUS RELEASES
----------------------------

=== In v0.70 ===

1. +platform_tcl()+ settings are now automatically determined

Added linenoise-win32.c.















































































































































































































































































































































































































































































































































































































































































































































































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/* this code is not standalone
 * it is included into linenoise.c
 * for windows.
 * It is deliberately kept separate so that
 * applications that have no need for windows
 * support can omit this
 */
static DWORD orig_consolemode = 0;

static int flushOutput(struct current *current);
static void outputNewline(struct current *current);

static void refreshStart(struct current *current)
{
}

static void refreshEnd(struct current *current)
{
}

static void refreshStartChars(struct current *current)
{
    assert(current->output == NULL);
    /* We accumulate all output here */
    current->output = sb_alloc();
#ifdef USE_UTF8
    current->ubuflen = 0;
#endif
}

static void refreshNewline(struct current *current)
{
    DRL("<nl>");
    outputNewline(current);
}

static void refreshEndChars(struct current *current)
{
    assert(current->output);
    flushOutput(current);
    sb_free(current->output);
    current->output = NULL;
}

static int enableRawMode(struct current *current) {
    DWORD n;
    INPUT_RECORD irec;

    current->outh = GetStdHandle(STD_OUTPUT_HANDLE);
    current->inh = GetStdHandle(STD_INPUT_HANDLE);

    if (!PeekConsoleInput(current->inh, &irec, 1, &n)) {
        return -1;
    }
    if (getWindowSize(current) != 0) {
        return -1;
    }
    if (GetConsoleMode(current->inh, &orig_consolemode)) {
        SetConsoleMode(current->inh, ENABLE_PROCESSED_INPUT);
    }
#ifdef USE_UTF8
    /* XXX is this the right thing to do? */
    SetConsoleCP(65001);
#endif
    return 0;
}

static void disableRawMode(struct current *current)
{
    SetConsoleMode(current->inh, orig_consolemode);
}

void linenoiseClearScreen(void)
{
    /* XXX: This is ugly. Should just have the caller pass a handle */
    struct current current;

    current.outh = GetStdHandle(STD_OUTPUT_HANDLE);

    if (getWindowSize(&current) == 0) {
        COORD topleft = { 0, 0 };
        DWORD n;

        FillConsoleOutputCharacter(current.outh, ' ',
            current.cols * current.rows, topleft, &n);
        FillConsoleOutputAttribute(current.outh,
            FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_GREEN,
            current.cols * current.rows, topleft, &n);
        SetConsoleCursorPosition(current.outh, topleft);
    }
}

static void cursorToLeft(struct current *current)
{
    COORD pos;
    DWORD n;

    pos.X = 0;
    pos.Y = (SHORT)current->y;

    FillConsoleOutputAttribute(current->outh,
        FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_GREEN, current->cols, pos, &n);
    current->x = 0;
}

#ifdef USE_UTF8
static void flush_ubuf(struct current *current)
{
    COORD pos;
    DWORD nwritten;
    pos.Y = (SHORT)current->y;
    pos.X = (SHORT)current->x;
    SetConsoleCursorPosition(current->outh, pos);
    WriteConsoleW(current->outh, current->ubuf, current->ubuflen, &nwritten, 0);
    current->x += current->ubufcols;
    current->ubuflen = 0;
    current->ubufcols = 0;
}

static void add_ubuf(struct current *current, int ch)
{
    /* This code originally by: Author: Mark E. Davis, 1994. */
    static const int halfShift  = 10; /* used for shifting by 10 bits */

    static const DWORD halfBase = 0x0010000UL;
    static const DWORD halfMask = 0x3FFUL;

    #define UNI_SUR_HIGH_START  0xD800
    #define UNI_SUR_HIGH_END    0xDBFF
    #define UNI_SUR_LOW_START   0xDC00
    #define UNI_SUR_LOW_END     0xDFFF

    #define UNI_MAX_BMP 0x0000FFFF

    if (ch > UNI_MAX_BMP) {
        /* convert from unicode to utf16 surrogate pairs
         * There is always space for one extra word in ubuf
         */
        ch -= halfBase;
        current->ubuf[current->ubuflen++] = (WORD)((ch >> halfShift) + UNI_SUR_HIGH_START);
        current->ubuf[current->ubuflen++] = (WORD)((ch & halfMask) + UNI_SUR_LOW_START);
    }
    else {
        current->ubuf[current->ubuflen++] = ch;
    }
    current->ubufcols += utf8_width(ch);
    if (current->ubuflen >= UBUF_MAX_CHARS) {
        flush_ubuf(current);
    }
}
#endif

static int flushOutput(struct current *current)
{
    const char *pt = sb_str(current->output);
    int len = sb_len(current->output);

#ifdef USE_UTF8
    /* convert utf8 in current->output into utf16 in current->ubuf
     */
    while (len) {
        int ch;
        int n = utf8_tounicode(pt, &ch);

        pt += n;
        len -= n;

        add_ubuf(current, ch);
    }
    flush_ubuf(current);
#else
    DWORD nwritten;
    COORD pos;

    pos.Y = (SHORT)current->y;
    pos.X = (SHORT)current->x;

    SetConsoleCursorPosition(current->outh, pos);
    WriteConsoleA(current->outh, pt, len, &nwritten, 0);

    current->x += len;
#endif

    sb_clear(current->output);

    return 0;
}

static int outputChars(struct current *current, const char *buf, int len)
{
    if (len < 0) {
        len = strlen(buf);
    }
    assert(current->output);

    sb_append_len(current->output, buf, len);

    return 0;
}

static void outputNewline(struct current *current)
{
    /* On the last row output a newline to force a scroll */
    if (current->y + 1 == current->rows) {
        outputChars(current, "\n", 1);
    }
    flushOutput(current);
    current->x = 0;
    current->y++;
}

static void setOutputHighlight(struct current *current, const int *props, int nprops)
{
    int colour = FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_GREEN;
    int bold = 0;
    int reverse = 0;
    int i;

    for (i = 0; i < nprops; i++) {
        switch (props[i]) {
            case 0:
               colour = FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_GREEN;
               bold = 0;
               reverse = 0;
               break;
            case 1:
               bold = FOREGROUND_INTENSITY;
               break;
            case 7:
               reverse = 1;
               break;
            case 30:
               colour = 0;
               break;
            case 31:
               colour = FOREGROUND_RED;
               break;
            case 32:
               colour = FOREGROUND_GREEN;
               break;
            case 33:
               colour = FOREGROUND_RED | FOREGROUND_GREEN;
               break;
            case 34:
               colour = FOREGROUND_BLUE;
               break;
            case 35:
               colour = FOREGROUND_RED | FOREGROUND_BLUE;
               break;
            case 36:
               colour = FOREGROUND_BLUE | FOREGROUND_GREEN;
               break;
            case 37:
               colour = FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_GREEN;
               break;
        }
    }

    flushOutput(current);

    if (reverse) {
        SetConsoleTextAttribute(current->outh, BACKGROUND_INTENSITY);
    }
    else {
        SetConsoleTextAttribute(current->outh, colour | bold);
    }
}

static void eraseEol(struct current *current)
{
    COORD pos;
    DWORD n;

    pos.X = (SHORT) current->x;
    pos.Y = (SHORT) current->y;

    FillConsoleOutputCharacter(current->outh, ' ', current->cols - current->x, pos, &n);
}

static void setCursorXY(struct current *current)
{
    COORD pos;

    pos.X = (SHORT) current->x;
    pos.Y = (SHORT) current->y;

    SetConsoleCursorPosition(current->outh, pos);
}


static void setCursorPos(struct current *current, int x)
{
    current->x = x;
    setCursorXY(current);
}

static void cursorUp(struct current *current, int n)
{
    current->y -= n;
    setCursorXY(current);
}

static void cursorDown(struct current *current, int n)
{
    current->y += n;
    setCursorXY(current);
}

static int fd_read(struct current *current)
{
    while (1) {
        INPUT_RECORD irec;
        DWORD n;
        if (WaitForSingleObject(current->inh, INFINITE) != WAIT_OBJECT_0) {
            break;
        }
        if (!ReadConsoleInputW(current->inh, &irec, 1, &n)) {
            break;
        }
        if (irec.EventType == KEY_EVENT) {
            KEY_EVENT_RECORD *k = &irec.Event.KeyEvent;
            if (k->bKeyDown || k->wVirtualKeyCode == VK_MENU) {
                if (k->dwControlKeyState & ENHANCED_KEY) {
                    switch (k->wVirtualKeyCode) {
                     case VK_LEFT:
                        return SPECIAL_LEFT;
                     case VK_RIGHT:
                        return SPECIAL_RIGHT;
                     case VK_UP:
                        return SPECIAL_UP;
                     case VK_DOWN:
                        return SPECIAL_DOWN;
                     case VK_INSERT:
                        return SPECIAL_INSERT;
                     case VK_DELETE:
                        return SPECIAL_DELETE;
                     case VK_HOME:
                        return SPECIAL_HOME;
                     case VK_END:
                        return SPECIAL_END;
                     case VK_PRIOR:
                        return SPECIAL_PAGE_UP;
                     case VK_NEXT:
                        return SPECIAL_PAGE_DOWN;
                    }
                }
                /* Note that control characters are already translated in AsciiChar */
                else if (k->wVirtualKeyCode == VK_CONTROL)
                    continue;
                else {
                    return k->uChar.UnicodeChar;
                }
            }
        }
    }
    return -1;
}

static int getWindowSize(struct current *current)
{
    CONSOLE_SCREEN_BUFFER_INFO info;
    if (!GetConsoleScreenBufferInfo(current->outh, &info)) {
        return -1;
    }
    current->cols = info.dwSize.X;
    current->rows = info.dwSize.Y;
    if (current->cols <= 0 || current->rows <= 0) {
        current->cols = 80;
        return -1;
    }
    current->y = info.dwCursorPosition.Y;
    current->x = info.dwCursorPosition.X;
    return 0;
}

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/* linenoise.c -- guerrilla line editing library against the idea that a
 * line editing lib needs to be 20,000 lines of C code.
 *
 * You can find the latest source code at:
 *
 *   http://github.com/msteveb/linenoise
 *   (forked from http://github.com/antirez/linenoise)
................................................................................
 * ------------
 * List of escape sequences used by this program, we do everything just
 * a few sequences. In order to be so cheap we may have some
 * flickering effect with some slow terminal, but the lesser sequences
 * the more compatible.
 *
 * EL (Erase Line)
 *    Sequence: ESC [ n K
 *    Effect: if n is 0 or missing, clear from cursor to end of line
 *    Effect: if n is 1, clear from beginning of line to cursor
 *    Effect: if n is 2, clear entire line
 *
 * CUF (CUrsor Forward)
 *    Sequence: ESC [ n C
 *    Effect: moves cursor forward of n chars
 *
 * CR (Carriage Return)
 *    Sequence: \r
 *    Effect: moves cursor to column 1
 *
 * The following are used to clear the screen: ESC [ H ESC [ 2 J
 * This is actually composed of two sequences:
................................................................................
 *    Effect: Exit standout mode
 *
 * == Only used if TIOCGWINSZ fails ==
 * DSR/CPR (Report cursor position)
 *    Sequence: ESC [ 6 n
 *    Effect: reports current cursor position as ESC [ NNN ; MMM R
 *









 * win32/console
 * -------------
 * If __MINGW32__ is defined, the win32 console API is used.
 * This could probably be made to work for the msvc compiler too.
 * This support based in part on work by Jon Griffiths.
 */

................................................................................
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <stdlib.h>
#include <sys/types.h>

#include "linenoise.h"



#include "utf8.h"

#define LINENOISE_DEFAULT_HISTORY_MAX_LEN 100
#define LINENOISE_MAX_LINE 4096

#define ctrl(C) ((C) - '@')

/* Use -ve numbers here to co-exist with normal unicode chars */
enum {
    SPECIAL_NONE,

    SPECIAL_UP = -20,
    SPECIAL_DOWN = -21,
    SPECIAL_LEFT = -22,
    SPECIAL_RIGHT = -23,
    SPECIAL_DELETE = -24,
    SPECIAL_HOME = -25,
    SPECIAL_END = -26,
    SPECIAL_INSERT = -27,
    SPECIAL_PAGE_UP = -28,
    SPECIAL_PAGE_DOWN = -29




};

static int history_max_len = LINENOISE_DEFAULT_HISTORY_MAX_LEN;
static int history_len = 0;
static char **history = NULL;

/* Structure to contain the status of the current (being edited) line */
struct current {
    char *buf;  /* Current buffer. Always null terminated */
    int bufmax; /* Size of the buffer, including space for the null termination */
    int len;    /* Number of bytes in 'buf' */
    int chars;  /* Number of chars in 'buf' (utf-8 chars) */
    int pos;    /* Cursor position, measured in chars */
    int cols;   /* Size of the window, in chars */


    const char *prompt;
    char *capture; /* Allocated capture buffer, or NULL for none. Always null terminated */

#if defined(USE_TERMIOS)
    int fd;     /* Terminal fd */
#elif defined(USE_WINCONSOLE)
    HANDLE outh; /* Console output handle */
    HANDLE inh; /* Console input handle */
    int rows;   /* Screen rows */
    int x;      /* Current column during output */
    int y;      /* Current row */






#endif
};

static int fd_read(struct current *current);
static int getWindowSize(struct current *current);









void linenoiseHistoryFree(void) {
    if (history) {
        int j;

        for (j = 0; j < history_len; j++)
            free(history[j]);
        free(history);
        history = NULL;
        history_len = 0;
    }
}





























































































































#if defined(USE_TERMIOS)
static void linenoiseAtExit(void);
static struct termios orig_termios; /* in order to restore at exit */
static int rawmode = 0; /* for atexit() function to check if restore is needed*/
static int atexit_registered = 0; /* register atexit just 1 time */

static const char *unsupported_term[] = {"dumb","cons25",NULL};

static int isUnsupportedTerm(void) {
    char *term = getenv("TERM");

    if (term) {
        int j;
        for (j = 0; unsupported_term[j]; j++) {
................................................................................

/* gcc/glibc insists that we care about the return code of write!
 * Clarification: This means that a void-cast like "(void) (EXPR)"
 * does not work.
 */
#define IGNORE_RC(EXPR) if (EXPR) {}

/* This is fdprintf() on some systems, but use a different
 * name to avoid conflicts
 */















static void fd_printf(int fd, const char *format, ...)
{
    va_list args;
    char buf[64];
    int n;

    va_start(args, format);
    n = vsnprintf(buf, sizeof(buf), format, args);
    /* This will never happen because we are sure to use fd_printf() for short sequences */
    assert(n < sizeof(buf));
    va_end(args);
    IGNORE_RC(write(fd, buf, n));
}

void linenoiseClearScreen(void)
{
    fd_printf(STDOUT_FILENO, "\x1b[H\x1b[2J");
}

static void cursorToLeft(struct current *current)
{
    fd_printf(current->fd, "\r");
}

static int outputChars(struct current *current, const char *buf, int len)
{
    return write(current->fd, buf, len);



}

static void outputControlChar(struct current *current, char ch)
{
    fd_printf(current->fd, "\x1b[7m^%c\x1b[0m", ch);
}

static void eraseEol(struct current *current)
{
    fd_printf(current->fd, "\x1b[0K");
}

static void setCursorPos(struct current *current, int x)
{
    if (x == 0) {
        cursorToLeft(current);
    }
    else {
        fd_printf(current->fd, "\r\x1b[%dC", x);
    }
}




















/**
 * Reads a char from 'fd', waiting at most 'timeout' milliseconds.
 *
 * A timeout of -1 means to wait forever.
 *
 * Returns -1 if no char is received within the time or an error occurs.
................................................................................
    utf8_tounicode(buf, &c);
    return c;
#else
    return fd_read_char(current->fd, -1);
#endif
}

static int countColorControlChars(const char* prompt)
{
    /* ANSI color control sequences have the form:
     * "\x1b" "[" [0-9;]* "m"
     * We parse them with a simple state machine.
     */

    enum {
        search_esc,
        expect_bracket,
        expect_trail
    } state = search_esc;
    int len = 0, found = 0;
    char ch;

    /* XXX: Strictly we should be checking utf8 chars rather than
     *      bytes in case of the extremely unlikely scenario where
     *      an ANSI sequence is part of a utf8 sequence.
     */
    while ((ch = *prompt++) != 0) {
        switch (state) {
        case search_esc:
            if (ch == '\x1b') {
                state = expect_bracket;
            }
            break;
        case expect_bracket:
            if (ch == '[') {
                state = expect_trail;
                /* 3 for "\e[ ... m" */
                len = 3;
                break;
            }
            state = search_esc;
            break;
        case expect_trail:
            if ((ch == ';') || ((ch >= '0' && ch <= '9'))) {
                /* 0-9, or semicolon */
                len++;
                break;
            }
            if (ch == 'm') {
                found += len;
            }
            state = search_esc;
            break;
        }
    }

    return found;
}

/**
 * Stores the current cursor column in '*cols'.
 * Returns 1 if OK, or 0 if failed to determine cursor pos.
 */
static int queryCursor(int fd, int* cols)
{






    /* control sequence - report cursor location */
    fd_printf(fd, "\x1b[6n");

    /* Parse the response: ESC [ rows ; cols R */
    if (fd_read_char(fd, 100) == 0x1b &&
        fd_read_char(fd, 100) == '[') {

        int n = 0;
        while (1) {

            int ch = fd_read_char(fd, 100);
            if (ch == ';') {
                /* Ignore rows */
                n = 0;
            }
            else if (ch == 'R') {
                /* Got cols */
                if (n != 0 && n < 1000) {





                    *cols = n;

                }
                break;


            }
            else if (ch >= 0 && ch <= '9') {
                n = n * 10 + ch - '0';
            }
            else {

                break;
            }
        }
        return 1;
    }

    return 0;
}

/**
 * Updates current->cols with the current window size (width)
 */
static int getWindowSize(struct current *current)
................................................................................
     * This gives us the width without messing with the externally
     * visible cursor position.
     */

    if (current->cols == 0) {
        int here;


        current->cols = 80;

        /* (a) */
        if (queryCursor (current->fd, &here)) {
            /* (b) */
            fd_printf(current->fd, "\x1b[999C");

            /* (c). Note: If (a) succeeded, then (c) should as well.
             * For paranoia we still check and have a fallback action
             * for (d) in case of failure..
             */
            if (!queryCursor (current->fd, &current->cols)) {
                /* (d') Unable to get accurate position data, reset
                 * the cursor to the far left. While this may not
                 * restore the exact original position it should not
                 * be too bad.
                 */
                fd_printf(current->fd, "\r");
            } else {
                /* (d) Reset the cursor back to the original location. */
                if (current->cols > here) {
                    fd_printf(current->fd, "\x1b[%dD", current->cols - here);

                }
            }
        } /* 1st query failed, doing nothing => default 80 */

    }

    return 0;
}

/**
 * If escape (27) was received, reads subsequent
 * chars to determine if this is a known special key.
 *
 * Returns SPECIAL_NONE if unrecognised, or -1 if EOF.
 *
 * If no additional char is received within a short time,
 * 27 is returned.
 */
static int check_special(int fd)
{
    int c = fd_read_char(fd, 50);
    int c2;

    if (c < 0) {
        return 27;
    }

    c2 = fd_read_char(fd, 50);
    if (c2 < 0) {
        return c2;
    }
    if (c == '[' || c == 'O') {
................................................................................
            /* .e.g \e[12~ or '\e[11;2~   discard the complete sequence */
            c = fd_read_char(fd, 50);
        }
    }

    return SPECIAL_NONE;
}
#elif defined(USE_WINCONSOLE)

static DWORD orig_consolemode = 0;

static int enableRawMode(struct current *current) {
    DWORD n;
    INPUT_RECORD irec;

    current->outh = GetStdHandle(STD_OUTPUT_HANDLE);
    current->inh = GetStdHandle(STD_INPUT_HANDLE);

    if (!PeekConsoleInput(current->inh, &irec, 1, &n)) {
        return -1;
    }
    if (getWindowSize(current) != 0) {
        return -1;
    }
    if (GetConsoleMode(current->inh, &orig_consolemode)) {
        SetConsoleMode(current->inh, ENABLE_PROCESSED_INPUT);
    }
    return 0;
}

static void disableRawMode(struct current *current)
{
    SetConsoleMode(current->inh, orig_consolemode);
}

void linenoiseClearScreen(void)
{
    /* XXX: This is ugly. Should just have the caller pass a handle */
    struct current current;

    current.outh = GetStdHandle(STD_OUTPUT_HANDLE);

    if (getWindowSize(&current) == 0) {
        COORD topleft = { 0, 0 };
        DWORD n;

        FillConsoleOutputCharacter(current.outh, ' ',
            current.cols * current.rows, topleft, &n);
        FillConsoleOutputAttribute(current.outh,
            FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_GREEN,
            current.cols * current.rows, topleft, &n);
        SetConsoleCursorPosition(current.outh, topleft);
    }
}

static void cursorToLeft(struct current *current)
{
    COORD pos;
    DWORD n;



    pos.X = 0;
    pos.Y = (SHORT)current->y;

    FillConsoleOutputAttribute(current->outh,
        FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_GREEN, current->cols, pos, &n);
    current->x = 0;
}

static int outputChars(struct current *current, const char *buf, int len)
{
    COORD pos;
    DWORD n;

    pos.Y = (SHORT)current->y;

#ifdef USE_UTF8
    while ( len > 0 ) {
        int c, s;
        wchar_t wc;

        s = utf8_tounicode(buf, &c);

        len -= s;
        buf += s;

        wc = (wchar_t)c;

        pos.X = (SHORT)current->x;

        /* fixed display utf8 character */
        WriteConsoleOutputCharacterW(current->outh, &wc, 1, pos, &n);

        current->x += utf8_width(c);
    }
#else
    pos.X = (SHORT)current->x;

    WriteConsoleOutputCharacterA(current->outh, buf, len, pos, &n);
    current->x += len;
#endif

    return 0;
}

static void outputControlChar(struct current *current, char ch)
{
    COORD pos;
    DWORD n;

    pos.X = (SHORT) current->x;
    pos.Y = (SHORT) current->y;

    FillConsoleOutputAttribute(current->outh, BACKGROUND_INTENSITY, 2, pos, &n);


    outputChars(current, "^", 1);
    outputChars(current, &ch, 1);

}

static void eraseEol(struct current *current)
{
    COORD pos;
    DWORD n;

    pos.X = (SHORT) current->x;
    pos.Y = (SHORT) current->y;

    FillConsoleOutputCharacter(current->outh, ' ', current->cols - current->x, pos, &n);
}

static void setCursorPos(struct current *current, int x)
{
    COORD pos;

    pos.X = (SHORT)x;
    pos.Y = (SHORT) current->y;

    SetConsoleCursorPosition(current->outh, pos);
    current->x = x;
}

static int fd_read(struct current *current)
{
    while (1) {
        INPUT_RECORD irec;
        DWORD n;
        if (WaitForSingleObject(current->inh, INFINITE) != WAIT_OBJECT_0) {
            break;
        }
        if (!ReadConsoleInput (current->inh, &irec, 1, &n)) {
            break;
        }
        if (irec.EventType == KEY_EVENT && irec.Event.KeyEvent.bKeyDown) {
            KEY_EVENT_RECORD *k = &irec.Event.KeyEvent;
            if (k->dwControlKeyState & ENHANCED_KEY) {
                switch (k->wVirtualKeyCode) {
                 case VK_LEFT:
                    return SPECIAL_LEFT;
                 case VK_RIGHT:
                    return SPECIAL_RIGHT;
                 case VK_UP:
                    return SPECIAL_UP;
                 case VK_DOWN:
                    return SPECIAL_DOWN;
                 case VK_INSERT:
                    return SPECIAL_INSERT;
                 case VK_DELETE:
                    return SPECIAL_DELETE;
                 case VK_HOME:
                    return SPECIAL_HOME;
                 case VK_END:
                    return SPECIAL_END;
                 case VK_PRIOR:
                    return SPECIAL_PAGE_UP;
                 case VK_NEXT:
                    return SPECIAL_PAGE_DOWN;
                }
            }
            /* Note that control characters are already translated in AsciiChar */
            else if (k->wVirtualKeyCode == VK_CONTROL)
                continue;
            else {
#ifdef USE_UTF8
                return k->uChar.UnicodeChar;
#else
                return k->uChar.AsciiChar;
#endif
            }
        }
    }
    return -1;
}

static int countColorControlChars(const char* prompt)
{
    /* For windows we assume that there are no embedded ansi color
     * control sequences.
     */
    return 0;
}

static int getWindowSize(struct current *current)
{
    CONSOLE_SCREEN_BUFFER_INFO info;
    if (!GetConsoleScreenBufferInfo(current->outh, &info)) {
        return -1;
    }
    current->cols = info.dwSize.X;
    current->rows = info.dwSize.Y;
    if (current->cols <= 0 || current->rows <= 0) {
        current->cols = 80;
        return -1;
    }
    current->y = info.dwCursorPosition.Y;
    current->x = info.dwCursorPosition.X;
    return 0;
}
#endif

#ifndef utf8_getchars
static int utf8_getchars(char *buf, int c)
{
#ifdef USE_UTF8
    return utf8_fromunicode(buf, c);
#else
    *buf = c;
................................................................................

/**
 * Returns the unicode character at the given offset,
 * or -1 if none.
 */
static int get_char(struct current *current, int pos)
{
    if (pos >= 0 && pos < current->chars) {
        int c;
        int i = utf8_index(current->buf, pos);
        (void)utf8_tounicode(current->buf + i, &c);
        return c;
    }
    return -1;
}

static void refreshLine(const char *prompt, struct current *current)
{

































    int plen;




















































































    int pchars;






    int backup = 0;





















































    int i;



    const char *buf = current->buf;
    int chars = current->chars;
    int pos = current->pos;






    int b;

    int ch;























































    int n;



    int width;
    int bufwidth;










    /* Should intercept SIGWINCH. For now, just get the size every time */
    getWindowSize(current);

    plen = strlen(prompt);
    pchars = utf8_strwidth(prompt, utf8_strlen(prompt, plen));

    /* Scan the prompt for embedded ansi color control sequences and
     * discount them as characters/columns.
     */
    pchars -= countColorControlChars(prompt);






    /* Account for a line which is too long to fit in the window.
     * Note that control chars require an extra column



     */

    /* How many cols are required to the left of 'pos'?
     * The prompt, plus one extra for each control char
     */
    n = pchars + utf8_strwidth(buf, utf8_strlen(buf, current->len));
    b = 0;



    for (i = 0; i < pos; i++) {





















        b += utf8_tounicode(buf + b, &ch);
        if (ch < ' ') {
            n++;
        }





    }

    /* Pluse one if the current char is a control character */
    if (current->pos < current->chars && get_char(current, current->pos) < ' ') {




        n++;
    }



    /* If too many are needed, strip chars off the front of 'buf'
     * until it fits. Note that if the current char is a control character,
     * we need one extra col.




     */
    while (n >= current->cols && pos > 0) {
        b = utf8_tounicode(buf, &ch);
        if (ch < ' ') {
            n--;



        }
        n -= utf8_width(ch);
        buf += b;
        pos--;
        chars--;
    }





    /* Cursor to left edge, then the prompt */
    cursorToLeft(current);

    outputChars(current, prompt, plen);


    /* Now the current buffer content */


    /* Need special handling for control characters.
     * If we hit 'cols', stop.























     */
    b = 0; /* unwritted bytes */
    n = 0; /* How many control chars were written */
    width = 0; /* current display width */
    bufwidth = utf8_strwidth(buf, pos);


    for (i = 0; i < chars; i++) {








        int ch;
        int w = utf8_tounicode(buf + b, &ch);
        if (ch < ' ') {
            n++;

        }




        width += utf8_width(ch);

        if (pchars + width + n >= current->cols) {



            break;
        }
















        if (ch < ' ') {
            /* A control character, so write the buffer so far */
            outputChars(current, buf, b);
            buf += b + w;
            b = 0;
            outputControlChar(current, ch + '@');
            if (i < pos) {
                backup++;
            }
        }
        else {







            b += w;

        }
    }










    outputChars(current, buf, b);

    /* Erase to right, move cursor to original position */
    eraseEol(current);



    setCursorPos(current, bufwidth + pchars + backup);
}














static void set_current(struct current *current, const char *str)
{
    strncpy(current->buf, str, current->bufmax);
    current->buf[current->bufmax - 1] = 0;
    current->len = strlen(current->buf);
    current->pos = current->chars = utf8_strlen(current->buf, current->len);

}

static int has_room(struct current *current, int bytes)
{
    return current->len + bytes < current->bufmax - 1;



}

/**
 * Removes the char at 'pos'.
 *
 * Returns 1 if the line needs to be refreshed, 2 if not
 * and 0 if nothing was removed
 */
static int remove_char(struct current *current, int pos)
{
    if (pos >= 0 && pos < current->chars) {
        int p1, p2;
        int ret = 1;
        p1 = utf8_index(current->buf, pos);
        p2 = p1 + utf8_index(current->buf + p1, 1);



#ifdef USE_TERMIOS
        /* optimise remove char in the case of removing the last char */
        if (current->pos == pos + 1 && current->pos == current->chars) {
            if (current->buf[pos] >= ' ' && utf8_strlen(current->prompt, -1) + utf8_strlen(current->buf, current->len) < current->cols - 1) {
                ret = 2;
                fd_printf(current->fd, "\b \b");
            }
        }
#endif

        /* Move the null char too */
        memmove(current->buf + p1, current->buf + p2, current->len - p2 + 1);
        current->len -= (p2 - p1);
        current->chars--;

        if (current->pos > pos) {
            current->pos--;
        }
        return ret;
    }
    return 0;
}

/**
 * Insert 'ch' at position 'pos'
 *
 * Returns 1 if the line needs to be refreshed, 2 if not
 * and 0 if nothing was inserted (no room)
 */
static int insert_char(struct current *current, int pos, int ch)
{

    char buf[MAX_UTF8_LEN];

    int n = utf8_getchars(buf, ch);

    if (has_room(current, n) && pos >= 0 && pos <= current->chars) {
        int p1, p2;
        int ret = 1;
        p1 = utf8_index(current->buf, pos);
        p2 = p1 + n;

#ifdef USE_TERMIOS
        /* optimise the case where adding a single char to the end and no scrolling is needed */
        if (current->pos == pos && current->chars == pos) {
            if (ch >= ' ' && utf8_strlen(current->prompt, -1) + utf8_strlen(current->buf, current->len) < current->cols - 1) {
                IGNORE_RC(write(current->fd, buf, n));
                ret = 2;

            }
        }
#endif

        memmove(current->buf + p2, current->buf + p1, current->len - p1);
        memcpy(current->buf + p1, buf, n);
        current->len += n;

        current->chars++;
        if (current->pos >= pos) {
            current->pos++;
        }
        return ret;
    }
    return 0;
}

/**
 * Captures up to 'n' characters starting at 'pos' for the cut buffer.
 *
 * This replaces any existing characters in the cut buffer.
 */
static void capture_chars(struct current *current, int pos, int n)
{
    if (pos >= 0 && (pos + n - 1) < current->chars) {
        int p1 = utf8_index(current->buf, pos);
        int nbytes = utf8_index(current->buf + p1, n);

        if (nbytes) {
            free(current->capture);
            /* Include space for the null terminator */
            current->capture = (char *)malloc(nbytes + 1);

            memcpy(current->capture, current->buf + p1, nbytes);
            current->capture[nbytes] = '\0';


        }
    }
}

/**
 * Removes up to 'n' characters at cursor position 'pos'.
 *
................................................................................
        inserted++;
        pos++;
        chars += n;
    }
    return inserted;
}

#ifndef NO_COMPLETION

static linenoiseCompletionCallback *completionCallback = NULL;
static void *completionUserdata = NULL;


static void beep() {


























#ifdef USE_TERMIOS
    fprintf(stderr, "\x7");
    fflush(stderr);



#endif




}


static void freeCompletions(linenoiseCompletions *lc) {
    size_t i;
    for (i = 0; i < lc->len; i++)
        free(lc->cvec[i]);
    free(lc->cvec);




}



static int completeLine(struct current *current) {
    linenoiseCompletions lc = { 0, NULL };
    int c = 0;





    completionCallback(current->buf,&lc,completionUserdata);
    if (lc.len == 0) {
        beep();
    } else {
        size_t stop = 0, i = 0;

        while(!stop) {
            /* Show completion or original buffer */
            if (i < lc.len) {
                struct current tmp = *current;
                tmp.buf = lc.cvec[i];
                tmp.pos = tmp.len = strlen(tmp.buf);
                tmp.chars = utf8_strlen(tmp.buf, tmp.len);
                refreshLine(current->prompt, &tmp);
            } else {
                refreshLine(current->prompt, current);




            }



            c = fd_read(current);
            if (c == -1) {


                break;
            }

            switch(c) {
                case '\t': /* tab */
                    i = (i+1) % (lc.len+1);
                    if (i == lc.len) beep();
                    break;
                case 27: /* escape */
                    /* Re-show original buffer */
                    if (i < lc.len) {
                        refreshLine(current->prompt, current);








                    }
                    stop = 1;



                    break;
                default:
                    /* Update buffer and return */
                    if (i < lc.len) {
                        set_current(current,lc.cvec[i]);
                    }
                    stop = 1;
                    break;
            }





        }
    }





    freeCompletions(&lc);
    return c; /* Return last read character */



}

/* Register a callback function to be called for tab-completion.
   Returns the prior callback so that the caller may (if needed)
   restore it when done. */
linenoiseCompletionCallback * linenoiseSetCompletionCallback(linenoiseCompletionCallback *fn, void *userdata) {
    linenoiseCompletionCallback * old = completionCallback;
    completionCallback = fn;
    completionUserdata = userdata;


    return old;
}

void linenoiseAddCompletion(linenoiseCompletions *lc, const char *str) {
    lc->cvec = (char **)realloc(lc->cvec,sizeof(char*)*(lc->len+1));
    lc->cvec[lc->len++] = strdup(str);
}

#endif

static int linenoiseEdit(struct current *current) {
    int history_index = 0;

    /* The latest history entry is always our current buffer, that
     * initially is just an empty string. */
    linenoiseHistoryAdd("");

    set_current(current, "");
    refreshLine(current->prompt, current);

    while(1) {
        int dir = -1;
        int c = fd_read(current);

#ifndef NO_COMPLETION
        /* Only autocomplete when the callback is set. It returns < 0 when
         * there was an error reading from fd. Otherwise it will return the
         * character that should be handled next. */
        if (c == '\t' && current->pos == current->chars && completionCallback != NULL) {
            c = completeLine(current);
            /* Return on errors */
            if (c < 0) return current->len;
            /* Read next character when 0 */
            if (c == 0) continue;
        }
#endif





process_char:
        if (c == -1) return current->len;

#ifdef USE_TERMIOS
        if (c == 27) {   /* escape sequence */
            c = check_special(current->fd);
        }
#endif





        switch(c) {


        case '\r':    /* enter */
            history_len--;
            free(history[history_len]);






            return current->len;
        case ctrl('C'):     /* ctrl-c */
            errno = EAGAIN;
            return -1;
        case ctrl('Z'):     /* ctrl-z */
#ifdef SIGTSTP
            /* send ourselves SIGSUSP */
            disableRawMode(current);
            raise(SIGTSTP);
            /* and resume */
            enableRawMode(current);
            refreshLine(current->prompt, current);
#endif
            continue;
        case 127:   /* backspace */
        case ctrl('H'):
            if (remove_char(current, current->pos - 1) == 1) {
                refreshLine(current->prompt, current);
            }
            break;
        case ctrl('D'):     /* ctrl-d */
            if (current->len == 0) {
                /* Empty line, so EOF */
                history_len--;
                free(history[history_len]);
                return -1;
            }
            /* Otherwise fall through to delete char to right of cursor */
        case SPECIAL_DELETE:
            if (remove_char(current, current->pos) == 1) {
                refreshLine(current->prompt, current);
            }
            break;
        case SPECIAL_INSERT:
            /* Ignore. Expansion Hook.
             * Future possibility: Toggle Insert/Overwrite Modes
             */
            break;
................................................................................

                /* now eat any non-spaces on the left */
                while (pos > 0 && get_char(current, pos - 1) != ' ') {
                    pos--;
                }

                if (remove_chars(current, pos, current->pos - pos)) {
                    refreshLine(current->prompt, current);
                }
            }
            break;
        case ctrl('R'):    /* ctrl-r */
            {
                /* Display the reverse-i-search prompt and process chars */
                char rbuf[50];
                char rprompt[80];
                int rchars = 0;
                int rlen = 0;
                int searchpos = history_len - 1;

                rbuf[0] = 0;
                while (1) {
                    int n = 0;
                    const char *p = NULL;
                    int skipsame = 0;
                    int searchdir = -1;

                    snprintf(rprompt, sizeof(rprompt), "(reverse-i-search)'%s': ", rbuf);
                    refreshLine(rprompt, current);
                    c = fd_read(current);
                    if (c == ctrl('H') || c == 127) {
                        if (rchars) {
                            int p = utf8_index(rbuf, --rchars);
                            rbuf[p] = 0;
                            rlen = strlen(rbuf);
                        }
                        continue;
                    }
#ifdef USE_TERMIOS
                    if (c == 27) {
                        c = check_special(current->fd);
                    }
#endif
                    if (c == ctrl('P') || c == SPECIAL_UP) {
                        /* Search for the previous (earlier) match */
                        if (searchpos > 0) {
                            searchpos--;
                        }
                        skipsame = 1;
                    }
                    else if (c == ctrl('N') || c == SPECIAL_DOWN) {
                        /* Search for the next (later) match */
                        if (searchpos < history_len) {
                            searchpos++;
                        }
                        searchdir = 1;
                        skipsame = 1;
                    }
                    else if (c >= ' ') {
                        /* >= here to allow for null terminator */
                        if (rlen >= (int)sizeof(rbuf) - MAX_UTF8_LEN) {
                            continue;
                        }

                        n = utf8_getchars(rbuf + rlen, c);
                        rlen += n;
                        rchars++;
                        rbuf[rlen] = 0;

                        /* Adding a new char resets the search location */
                        searchpos = history_len - 1;
                    }
                    else {
                        /* Exit from incremental search mode */
                        break;
                    }

                    /* Now search through the history for a match */
                    for (; searchpos >= 0 && searchpos < history_len; searchpos += searchdir) {
                        p = strstr(history[searchpos], rbuf);
                        if (p) {
                            /* Found a match */
                            if (skipsame && strcmp(history[searchpos], current->buf) == 0) {
                                /* But it is identical, so skip it */
                                continue;
                            }
                            /* Copy the matching line and set the cursor position */
                            set_current(current,history[searchpos]);
                            current->pos = utf8_strlen(history[searchpos], p - history[searchpos]);
                            break;
                        }
                    }
                    if (!p && n) {
                        /* No match, so don't add it */
                        rchars--;
                        rlen -= n;
                        rbuf[rlen] = 0;
                    }
                }
                if (c == ctrl('G') || c == ctrl('C')) {
                    /* ctrl-g terminates the search with no effect */
                    set_current(current, "");
                    c = 0;
                }
                else if (c == ctrl('J')) {
                    /* ctrl-j terminates the search leaving the buffer in place */
                    c = 0;
                }
                /* Go process the char normally */
                refreshLine(current->prompt, current);
                goto process_char;
            }
            break;
        case ctrl('T'):    /* ctrl-t */
            if (current->pos > 0 && current->pos <= current->chars) {
                /* If cursor is at end, transpose the previous two chars */
                int fixer = (current->pos == current->chars);
                c = get_char(current, current->pos - fixer);
                remove_char(current, current->pos - fixer);
                insert_char(current, current->pos - 1, c);
                refreshLine(current->prompt, current);
            }
            break;
        case ctrl('V'):    /* ctrl-v */
            if (has_room(current, MAX_UTF8_LEN)) {
                /* Insert the ^V first */
                if (insert_char(current, current->pos, c)) {
                    refreshLine(current->prompt, current);
                    /* Now wait for the next char. Can insert anything except \0 */
                    c = fd_read(current);

                    /* Remove the ^V first */
                    remove_char(current, current->pos - 1);
                    if (c != -1) {
                        /* Insert the actual char */
                        insert_char(current, current->pos, c);
                    }
                    refreshLine(current->prompt, current);
                }
            }
            break;
        case ctrl('B'):
        case SPECIAL_LEFT:
            if (current->pos > 0) {
                current->pos--;
                refreshLine(current->prompt, current);
            }
            break;
        case ctrl('F'):
        case SPECIAL_RIGHT:
            if (current->pos < current->chars) {
                current->pos++;
                refreshLine(current->prompt, current);
            }
            break;
        case SPECIAL_PAGE_UP:
          dir = history_len - history_index - 1; /* move to start of history */
          goto history_navigation;
        case SPECIAL_PAGE_DOWN:
          dir = -history_index; /* move to 0 == end of history, i.e. current */
................................................................................
        case ctrl('N'):
        case SPECIAL_DOWN:
history_navigation:
            if (history_len > 1) {
                /* Update the current history entry before to
                 * overwrite it with tne next one. */
                free(history[history_len - 1 - history_index]);
                history[history_len - 1 - history_index] = strdup(current->buf);
                /* Show the new entry */
                history_index += dir;
                if (history_index < 0) {
                    history_index = 0;
                    break;
                } else if (history_index >= history_len) {
                    history_index = history_len - 1;
                    break;
                }
                set_current(current, history[history_len - 1 - history_index]);
                refreshLine(current->prompt, current);
            }
            break;
        case ctrl('A'): /* Ctrl+a, go to the start of the line */
        case SPECIAL_HOME:
            current->pos = 0;
            refreshLine(current->prompt, current);
            break;
        case ctrl('E'): /* ctrl+e, go to the end of the line */
        case SPECIAL_END:
            current->pos = current->chars;
            refreshLine(current->prompt, current);
            break;
        case ctrl('U'): /* Ctrl+u, delete to beginning of line, save deleted chars. */
            if (remove_chars(current, 0, current->pos)) {
                refreshLine(current->prompt, current);
            }
            break;
        case ctrl('K'): /* Ctrl+k, delete from current to end of line, save deleted chars. */
            if (remove_chars(current, current->pos, current->chars - current->pos)) {
                refreshLine(current->prompt, current);
            }
            break;
        case ctrl('Y'): /* Ctrl+y, insert saved chars at current position */
            if (current->capture && insert_chars(current, current->pos, current->capture)) {
                refreshLine(current->prompt, current);
            }
            break;
        case ctrl('L'): /* Ctrl+L, clear screen */
            linenoiseClearScreen();
            /* Force recalc of window size for serial terminals */
            current->cols = 0;

            refreshLine(current->prompt, current);
            break;
        default:
            /* Only tab is allowed without ^V */
            if (c == '\t' || c >= ' ') {
                if (insert_char(current, current->pos, c) == 1) {
                    refreshLine(current->prompt, current);
                }
            }
            break;
        }
    }
    return current->len;
}

int linenoiseColumns(void)
{
    struct current current;
    enableRawMode (&current);
    getWindowSize (&current);
    disableRawMode (&current);
    return current.cols;
}




































char *linenoise(const char *prompt)
{
    int count;
    struct current current;
    char buf[LINENOISE_MAX_LINE];



    if (enableRawMode(&current) == -1) {
        printf("%s", prompt);
        fflush(stdout);
        if (fgets(buf, sizeof(buf), stdin) == NULL) {
            return NULL;
        }
        count = strlen(buf);
        if (count && buf[count-1] == '\n') {
            count--;
            buf[count] = '\0';
        }
    }
    else
    {
        current.buf = buf;
        current.bufmax = sizeof(buf);
        current.len = 0;
        current.chars = 0;
        current.pos = 0;

        current.prompt = prompt;
        current.capture = NULL;

        count = linenoiseEdit(&current);

        disableRawMode(&current);
        printf("\n");

        free(current.capture);
        if (count == -1) {

            return NULL;
        }

    }
    return strdup(buf);

}

/* Using a circular buffer is smarter, but a bit more complex to handle. */
int linenoiseHistoryAdd(const char *line) {
    char *linecopy;

    if (history_max_len == 0) return 0;




    if (history == NULL) {
        history = (char **)malloc(sizeof(char*)*history_max_len);
        if (history == NULL) return 0;
        memset(history,0,(sizeof(char*)*history_max_len));

    }

    /* do not insert duplicate lines into history */
    if (history_len > 0 && strcmp(line, history[history_len - 1]) == 0) {
        return 0;
    }

    linecopy = strdup(line);
    if (!linecopy) return 0;
    if (history_len == history_max_len) {
        free(history[0]);
        memmove(history,history+1,sizeof(char*)*(history_max_len-1));
        history_len--;
    }
    history[history_len] = linecopy;
    history_len++;
    return 1;
}





int linenoiseHistoryGetMaxLen(void) {
    return history_max_len;
}

int linenoiseHistorySetMaxLen(int len) {
    char **newHistory;

    if (len < 1) return 0;
    if (history) {
        int tocopy = history_len;

        newHistory = (char **)malloc(sizeof(char*)*len);
        if (newHistory == NULL) return 0;

        /* If we can't copy everything, free the elements we'll not use. */
        if (len < tocopy) {
            int j;

            for (j = 0; j < tocopy-len; j++) free(history[j]);
            tocopy = len;
        }
        memset(newHistory,0,sizeof(char*)*len);
        memcpy(newHistory,history+(history_len-tocopy), sizeof(char*)*tocopy);
        free(history);
        history = newHistory;
    }
    history_max_len = len;
    if (history_len > history_max_len)
        history_len = history_max_len;
................................................................................
        fputc('\n', fp);
    }

    fclose(fp);
    return 0;
}

/* Load the history from the specified file. If the file does not exist
 * zero is returned and no operation is performed.
 *

 * If the file exists and the operation succeeded 0 is returned, otherwise
 * on error -1 is returned. */

int linenoiseHistoryLoad(const char *filename) {
    FILE *fp = fopen(filename,"r");
    char buf[LINENOISE_MAX_LINE];


    if (fp == NULL) return -1;

    while (fgets(buf,LINENOISE_MAX_LINE,fp) != NULL) {



        char *src, *dest;

        /* Decode backslash escaped values */
        for (src = dest = buf; *src; src++) {
            char ch = *src;

            if (ch == '\\') {
                src++;
                if (*src == 'n') {
                    ch = '\n';
                }
................................................................................
                    ch = '\r';
                } else {
                    ch = *src;
                }
            }
            *dest++ = ch;
        }
        /* Remove trailing newline */
        if (dest != buf && (dest[-1] == '\n' || dest[-1] == '\r')) {
            dest--;
        }
        *dest = 0;

        linenoiseHistoryAdd(buf);
    }
    fclose(fp);
    return 0;
}

/* Provide access to the history buffer.
 *
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#ifndef STRINGBUF_H
#define STRINGBUF_H

/* (c) 2017 Workware Systems Pty Ltd  -- All Rights Reserved */

#ifdef __cplusplus
extern "C" {
#endif

/** @file
 * A stringbuf is a resizing, null terminated string buffer.
 *
 * The buffer is reallocated as necessary.
 *
 * In general it is *not* OK to call these functions with a NULL pointer
 * unless stated otherwise.
 *
 * If USE_UTF8 is defined, supports utf8.
 */

/**
 * The stringbuf structure should not be accessed directly.
 * Use the functions below.
 */
typedef struct {
	int remaining;	/**< Allocated, but unused space */
	int last;		/**< Index of the null terminator (and thus the length of the string) */
#ifdef USE_UTF8
	int chars;		/**< Count of characters */
#endif
	char *data;		/**< Allocated memory containing the string or NULL for empty */
} stringbuf;

/**
 * Allocates and returns a new stringbuf with no elements.
 */
stringbuf *sb_alloc(void);

/**
 * Frees a stringbuf.
 * It is OK to call this with NULL.
 */
void sb_free(stringbuf *sb);

/**
 * Returns an allocated copy of the stringbuf
 */
stringbuf *sb_copy(stringbuf *sb);

/**
 * Returns the length of the buffer.
 * 
 * Returns 0 for both a NULL buffer and an empty buffer.
 */
static inline int sb_len(stringbuf *sb) {
	return sb->last;
}

/**
 * Returns the utf8 character length of the buffer.
 * 
 * Returns 0 for both a NULL buffer and an empty buffer.
 */
static inline int sb_chars(stringbuf *sb) {
#ifdef USE_UTF8
	return sb->chars;
#else
	return sb->last;
#endif
}

/**
 * Appends a null terminated string to the stringbuf
 */
void sb_append(stringbuf *sb, const char *str);

/**
 * Like sb_append() except does not require a null terminated string.
 * The length of 'str' is given as 'len'
 *
 * Note that in utf8 mode, characters will *not* be counted correctly
 * if a partial utf8 sequence is added with sb_append_len()
 */
void sb_append_len(stringbuf *sb, const char *str, int len);

/**
 * Returns a pointer to the null terminated string in the buffer.
 *
 * Note this pointer only remains valid until the next modification to the
 * string buffer.
 *
 * The returned pointer can be used to update the buffer in-place
 * as long as care is taken to not overwrite the end of the buffer.
 */
static inline char *sb_str(const stringbuf *sb)
{
	return sb->data;
}

/**
 * Inserts the given string *before* (zero-based) 'index' in the stringbuf.
 * If index is past the end of the buffer, the string is appended,
 * just like sb_append()
 */
void sb_insert(stringbuf *sb, int index, const char *str);

/**
 * Delete 'len' bytes in the string at the given index.
 *
 * Any bytes past the end of the buffer are ignored.
 * The buffer remains null terminated.
 *
 * If len is -1, deletes to the end of the buffer.
 */
void sb_delete(stringbuf *sb, int index, int len);

/**
 * Clear to an empty buffer.
 */
void sb_clear(stringbuf *sb);

/**
 * Return an allocated copy of buffer and frees 'sb'.
 *
 * If 'sb' is empty, returns an allocated copy of "".
 */
char *sb_to_string(stringbuf *sb);

#ifdef __cplusplus
}
#endif

#endif
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include <assert.h>

#ifndef STRINGBUF_H
#include "stringbuf.h"
#endif
#ifdef USE_UTF8
#include "utf8.h"
#endif

#define SB_INCREMENT 200

stringbuf *sb_alloc(void)
{
	stringbuf *sb = (stringbuf *)malloc(sizeof(*sb));
	sb->remaining = 0;
	sb->last = 0;
#ifdef USE_UTF8
	sb->chars = 0;
#endif
	sb->data = NULL;

	return(sb);
}

void sb_free(stringbuf *sb)
{
	if (sb) {
		free(sb->data);
	}
	free(sb);
}

void sb_realloc(stringbuf *sb, int newlen)
{
	sb->data = (char *)realloc(sb->data, newlen);
	sb->remaining = newlen - sb->last;
}

void sb_append(stringbuf *sb, const char *str)
{
	sb_append_len(sb, str, strlen(str));
}

void sb_append_len(stringbuf *sb, const char *str, int len)
{
	int utf8_strlen(const char *str, int bytelen);
	if (sb->remaining < len + 1) {
		sb_realloc(sb, sb->last + len + 1 + SB_INCREMENT);
	}
	memcpy(sb->data + sb->last, str, len);
	sb->data[sb->last + len] = 0;

	sb->last += len;
	sb->remaining -= len;
#ifdef USE_UTF8
	sb->chars += utf8_strlen(str, len);
#endif
}

char *sb_to_string(stringbuf *sb)
{
	if (sb->data == NULL) {
		/* Return an allocated empty string, not null */
		return strdup("");
	}
	else {
		/* Just return the data and free the stringbuf structure */
		char *pt = sb->data;
		free(sb);
		return pt;
	}
}

/* Insert and delete operations */

/* Moves up all the data at position 'pos' and beyond by 'len' bytes
 * to make room for new data
 *
 * Note: Does *not* update sb->chars
 */
static void sb_insert_space(stringbuf *sb, int pos, int len)
{
	assert(pos <= sb->last);

	/* Make sure there is enough space */
	if (sb->remaining < len) {
		sb_realloc(sb, sb->last + len + SB_INCREMENT);
	}
	/* Now move it up */
	memmove(sb->data + pos + len, sb->data + pos, sb->last - pos);
	sb->last += len;
	sb->remaining -= len;
	/* And null terminate */
	sb->data[sb->last] = 0;
}

/**
 * Move down all the data from pos + len, effectively
 * deleting the data at position 'pos' of length 'len'
 */
static void sb_delete_space(stringbuf *sb, int pos, int len)
{
	assert(pos < sb->last);
	assert(pos + len <= sb->last);

#ifdef USE_UTF8
	sb->chars -= utf8_strlen(sb->data + pos, len);
#endif

	/* Now move it up */
	memmove(sb->data + pos, sb->data + pos + len, sb->last - pos - len);
	sb->last -= len;
	sb->remaining += len;
	/* And null terminate */
	sb->data[sb->last] = 0;
}

void sb_insert(stringbuf *sb, int index, const char *str)
{
	if (index >= sb->last) {
		/* Inserting after the end of the list appends. */
		sb_append(sb, str);
	}
	else {
		int len = strlen(str);

		sb_insert_space(sb, index, len);
		memcpy(sb->data + index, str, len);
#ifdef USE_UTF8
		sb->chars += utf8_strlen(str, len);
#endif
	}
}

/**
 * Delete the bytes at index 'index' for length 'len'
 * Has no effect if the index is past the end of the list.
 */
void sb_delete(stringbuf *sb, int index, int len)
{
	if (index < sb->last) {
		char *pos = sb->data + index;
		if (len < 0) {
			len = sb->last;
		}

		sb_delete_space(sb, pos - sb->data, len);
	}
}

void sb_clear(stringbuf *sb)
{
	if (sb->data) {
		/* Null terminate */
		sb->data[0] = 0;
		sb->last = 0;
#ifdef USE_UTF8
		sb->chars = 0;
#endif
	}
}
/* linenoise.c -- guerrilla line editing library against the idea that a
 * line editing lib needs to be 20,000 lines of C code.
 *
 * You can find the latest source code at:
 *
 *   http://github.com/msteveb/linenoise
 *   (forked from http://github.com/antirez/linenoise)
................................................................................
 * ------------
 * List of escape sequences used by this program, we do everything just
 * a few sequences. In order to be so cheap we may have some
 * flickering effect with some slow terminal, but the lesser sequences
 * the more compatible.
 *
 * EL (Erase Line)
 *    Sequence: ESC [ 0 K
 *    Effect: clear from cursor to end of line


 *
 * CUF (CUrsor Forward)
 *    Sequence: ESC [ n C
 *    Effect: moves cursor forward n chars
 *
 * CR (Carriage Return)
 *    Sequence: \r
 *    Effect: moves cursor to column 1
 *
 * The following are used to clear the screen: ESC [ H ESC [ 2 J
 * This is actually composed of two sequences:
................................................................................
 *    Effect: Exit standout mode
 *
 * == Only used if TIOCGWINSZ fails ==
 * DSR/CPR (Report cursor position)
 *    Sequence: ESC [ 6 n
 *    Effect: reports current cursor position as ESC [ NNN ; MMM R
 *
 * == Only used in multiline mode ==
 * CUU (Cursor Up)
 *    Sequence: ESC [ n A
 *    Effect: moves cursor up n chars.
 *
 * CUD (Cursor Down)
 *    Sequence: ESC [ n B
 *    Effect: moves cursor down n chars.
 *
 * win32/console
 * -------------
 * If __MINGW32__ is defined, the win32 console API is used.
 * This could probably be made to work for the msvc compiler too.
 * This support based in part on work by Jon Griffiths.
 */

................................................................................
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <stdlib.h>
#include <sys/types.h>

#include "linenoise.h"
#ifndef STRINGBUF_H
#include "stringbuf.h"
#endif
#include "utf8.h"

#define LINENOISE_DEFAULT_HISTORY_MAX_LEN 100


#define ctrl(C) ((C) - '@')

/* Use -ve numbers here to co-exist with normal unicode chars */
enum {
    SPECIAL_NONE,
    /* don't use -1 here since that indicates error */
    SPECIAL_UP = -20,
    SPECIAL_DOWN = -21,
    SPECIAL_LEFT = -22,
    SPECIAL_RIGHT = -23,
    SPECIAL_DELETE = -24,
    SPECIAL_HOME = -25,
    SPECIAL_END = -26,
    SPECIAL_INSERT = -27,
    SPECIAL_PAGE_UP = -28,
    SPECIAL_PAGE_DOWN = -29,

    /* Some handy names for other special keycodes */
    CHAR_ESCAPE = 27,
    CHAR_DELETE = 127,
};

static int history_max_len = LINENOISE_DEFAULT_HISTORY_MAX_LEN;
static int history_len = 0;
static char **history = NULL;

/* Structure to contain the status of the current (being edited) line */
struct current {
    stringbuf *buf; /* Current buffer. Always null terminated */



    int pos;    /* Cursor position, measured in chars */
    int cols;   /* Size of the window, in chars */
    int nrows;  /* How many rows are being used in multiline mode (>= 1) */
    int rpos;   /* The current row containing the cursor - multiline mode only */
    const char *prompt;
    stringbuf *capture; /* capture buffer, or NULL for none. Always null terminated */
    stringbuf *output;  /* used only during refreshLine() - output accumulator */
#if defined(USE_TERMIOS)
    int fd;     /* Terminal fd */
#elif defined(USE_WINCONSOLE)
    HANDLE outh; /* Console output handle */
    HANDLE inh; /* Console input handle */
    int rows;   /* Screen rows */
    int x;      /* Current column during output */
    int y;      /* Current row */
#ifdef USE_UTF8
    #define UBUF_MAX_CHARS 132
    WORD ubuf[UBUF_MAX_CHARS + 1];  /* Accumulates utf16 output - one extra for final surrogate pairs */
    int ubuflen;      /* length used in ubuf */
    int ubufcols;     /* how many columns are represented by the chars in ubuf? */
#endif
#endif
};

static int fd_read(struct current *current);
static int getWindowSize(struct current *current);
static void cursorDown(struct current *current, int n);
static void cursorUp(struct current *current, int n);
static void eraseEol(struct current *current);
static void refreshLine(struct current *current);
static void refreshLineAlt(struct current *current, const char *prompt, const char *buf, int cursor_pos);
static void setCursorPos(struct current *current, int x);
static void setOutputHighlight(struct current *current, const int *props, int nprops);
static void set_current(struct current *current, const char *str);

void linenoiseHistoryFree(void) {
    if (history) {
        int j;

        for (j = 0; j < history_len; j++)
            free(history[j]);
        free(history);
        history = NULL;
        history_len = 0;
    }
}

struct esc_parser {
    enum {
        EP_START,   /* looking for ESC */
        EP_ESC,     /* looking for [ */
        EP_DIGITS,  /* parsing digits */
        EP_PROPS,   /* parsing digits or semicolons */
        EP_END,     /* ok */
        EP_ERROR,   /* error */
    } state;
    int props[5];   /* properties are stored here */
    int maxprops;   /* size of the props[] array */
    int numprops;   /* number of properties found */
    int termchar;   /* terminator char, or 0 for any alpha */
    int current;    /* current (partial) property value */
};

/**
 * Initialise the escape sequence parser at *parser.
 *
 * If termchar is 0 any alpha char terminates ok. Otherwise only the given
 * char terminates successfully.
 * Run the parser state machine with calls to parseEscapeSequence() for each char.
 */
static void initParseEscapeSeq(struct esc_parser *parser, int termchar)
{
    parser->state = EP_START;
    parser->maxprops = sizeof(parser->props) / sizeof(*parser->props);
    parser->numprops = 0;
    parser->current = 0;
    parser->termchar = termchar;
}

/**
 * Pass character 'ch' into the state machine to parse:
 *   'ESC' '[' <digits> (';' <digits>)* <termchar>
 *
 * The first character must be ESC.
 * Returns the current state. The state machine is done when it returns either EP_END
 * or EP_ERROR.
 *
 * On EP_END, the "property/attribute" values can be read from parser->props[]
 * of length parser->numprops.
 */
static int parseEscapeSequence(struct esc_parser *parser, int ch)
{
    switch (parser->state) {
        case EP_START:
            parser->state = (ch == '\x1b') ? EP_ESC : EP_ERROR;
            break;
        case EP_ESC:
            parser->state = (ch == '[') ? EP_DIGITS : EP_ERROR;
            break;
        case EP_PROPS:
            if (ch == ';') {
                parser->state = EP_DIGITS;
donedigits:
                if (parser->numprops + 1 < parser->maxprops) {
                    parser->props[parser->numprops++] = parser->current;
                    parser->current = 0;
                }
                break;
            }
            /* fall through */
        case EP_DIGITS:
            if (ch >= '0' && ch <= '9') {
                parser->current = parser->current * 10 + (ch - '0');
                parser->state = EP_PROPS;
                break;
            }
            /* must be terminator */
            if (parser->termchar != ch) {
                if (parser->termchar != 0 || !((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z'))) {
                    parser->state = EP_ERROR;
                    break;
                }
            }
            parser->state = EP_END;
            goto donedigits;
        case EP_END:
            parser->state = EP_ERROR;
            break;
        case EP_ERROR:
            break;
    }
    return parser->state;
}

/*#define DEBUG_REFRESHLINE*/

#ifdef DEBUG_REFRESHLINE
#define DRL(ARGS...) fprintf(dfh, ARGS)
static FILE *dfh;

static void DRL_CHAR(int ch)
{
    if (ch < ' ') {
        DRL("^%c", ch + '@');
    }
    else if (ch > 127) {
        DRL("\\u%04x", ch);
    }
    else {
        DRL("%c", ch);
    }
}
static void DRL_STR(const char *str)
{
    while (*str) {
        int ch;
        int n = utf8_tounicode(str, &ch);
        str += n;
        DRL_CHAR(ch);
    }
}
#else
#define DRL(ARGS...)
#define DRL_CHAR(ch)
#define DRL_STR(str)
#endif

#if defined(USE_WINCONSOLE)
#include "linenoise-win32.c"
#endif

#if defined(USE_TERMIOS)
static void linenoiseAtExit(void);
static struct termios orig_termios; /* in order to restore at exit */
static int rawmode = 0; /* for atexit() function to check if restore is needed*/
static int atexit_registered = 0; /* register atexit just 1 time */

static const char *unsupported_term[] = {"dumb","cons25","emacs",NULL};

static int isUnsupportedTerm(void) {
    char *term = getenv("TERM");

    if (term) {
        int j;
        for (j = 0; unsupported_term[j]; j++) {
................................................................................

/* gcc/glibc insists that we care about the return code of write!
 * Clarification: This means that a void-cast like "(void) (EXPR)"
 * does not work.
 */
#define IGNORE_RC(EXPR) if (EXPR) {}

/**
 * Output bytes directly, or accumulate output (if current->output is set)
 */
static void outputChars(struct current *current, const char *buf, int len)
{
    if (len < 0) {
        len = strlen(buf);
    }
    if (current->output) {
        sb_append_len(current->output, buf, len);
    }
    else {
        IGNORE_RC(write(current->fd, buf, len));
    }
}

/* Like outputChars, but using printf-style formatting
 */
static void outputFormatted(struct current *current, const char *format, ...)
{
    va_list args;
    char buf[64];
    int n;

    va_start(args, format);
    n = vsnprintf(buf, sizeof(buf), format, args);
    /* This will never happen because we are sure to use outputFormatted() only for short sequences */
    assert(n < (int)sizeof(buf));
    va_end(args);
    outputChars(current, buf, n);





}

static void cursorToLeft(struct current *current)
{
    outputChars(current, "\r", -1);
}

static void setOutputHighlight(struct current *current, const int *props, int nprops)
{
    outputChars(current, "\x1b[", -1);
    while (nprops--) {
        outputFormatted(current, "%d%c", *props, (nprops == 0) ? 'm' : ';');
        props++;
    }




}

static void eraseEol(struct current *current)
{
    outputChars(current, "\x1b[0K", -1);
}

static void setCursorPos(struct current *current, int x)
{
    if (x == 0) {
        cursorToLeft(current);
    }
    else {
        outputFormatted(current, "\r\x1b[%dC", x);
    }
}

static void cursorUp(struct current *current, int n)
{
    if (n) {
        outputFormatted(current, "\x1b[%dA", n);
    }
}

static void cursorDown(struct current *current, int n)
{
    if (n) {
        outputFormatted(current, "\x1b[%dB", n);
    }
}

void linenoiseClearScreen(void)
{
    write(STDOUT_FILENO, "\x1b[H\x1b[2J", 7);
}

/**
 * Reads a char from 'fd', waiting at most 'timeout' milliseconds.
 *
 * A timeout of -1 means to wait forever.
 *
 * Returns -1 if no char is received within the time or an error occurs.
................................................................................
    utf8_tounicode(buf, &c);
    return c;
#else
    return fd_read_char(current->fd, -1);
#endif
}





















































/**
 * Stores the current cursor column in '*cols'.
 * Returns 1 if OK, or 0 if failed to determine cursor pos.
 */
static int queryCursor(struct current *current, int* cols)
{
    struct esc_parser parser;
    int ch;

    /* Should not be buffering this output, it needs to go immediately */
    assert(current->output == NULL);

    /* control sequence - report cursor location */
    outputChars(current, "\x1b[6n", -1);

    /* Parse the response: ESC [ rows ; cols R */





    initParseEscapeSeq(&parser, 'R');
    while ((ch = fd_read_char(current->fd, 100)) > 0) {







        switch (parseEscapeSequence(&parser, ch)) {
            default:
                continue;
            case EP_END:
                if (parser.numprops == 2 && parser.props[1] < 1000) {
                    *cols = parser.props[1];
                    return 1;
                }
                break;
            case EP_ERROR:
                break;
        }




        /* failed */
        break;
    }




    return 0;
}

/**
 * Updates current->cols with the current window size (width)
 */
static int getWindowSize(struct current *current)
................................................................................
     * This gives us the width without messing with the externally
     * visible cursor position.
     */

    if (current->cols == 0) {
        int here;

        /* If anything fails => default 80 */
        current->cols = 80;

        /* (a) */
        if (queryCursor (current, &here)) {
            /* (b) */
            setCursorPos(current, 999);

            /* (c). Note: If (a) succeeded, then (c) should as well.
             * For paranoia we still check and have a fallback action
             * for (d) in case of failure..
             */
            if (queryCursor (current, &current->cols)) {







                /* (d) Reset the cursor back to the original location. */
                if (current->cols > here) {

                    setCursorPos(current, here);
                }
            }

        }
    }

    return 0;
}

/**
 * If CHAR_ESCAPE was received, reads subsequent
 * chars to determine if this is a known special key.
 *
 * Returns SPECIAL_NONE if unrecognised, or -1 if EOF.
 *
 * If no additional char is received within a short time,
 * CHAR_ESCAPE is returned.
 */
static int check_special(int fd)
{
    int c = fd_read_char(fd, 50);
    int c2;

    if (c < 0) {
        return CHAR_ESCAPE;
    }

    c2 = fd_read_char(fd, 50);
    if (c2 < 0) {
        return c2;
    }
    if (c == '[' || c == 'O') {
................................................................................
            /* .e.g \e[12~ or '\e[11;2~   discard the complete sequence */
            c = fd_read_char(fd, 50);
        }
    }

    return SPECIAL_NONE;
}
#endif















































static void clearOutputHighlight(struct current *current)
{


    int nohighlight = 0;
    setOutputHighlight(current, &nohighlight, 1);
}












































static void outputControlChar(struct current *current, char ch)
{







    int reverse = 7;
    setOutputHighlight(current, &reverse, 1);
    outputChars(current, "^", 1);
    outputChars(current, &ch, 1);
    clearOutputHighlight(current);
}





































































































#ifndef utf8_getchars
static int utf8_getchars(char *buf, int c)
{
#ifdef USE_UTF8
    return utf8_fromunicode(buf, c);
#else
    *buf = c;
................................................................................

/**
 * Returns the unicode character at the given offset,
 * or -1 if none.
 */
static int get_char(struct current *current, int pos)
{
    if (pos >= 0 && pos < sb_chars(current->buf)) {
        int c;
        int i = utf8_index(sb_str(current->buf), pos);
        (void)utf8_tounicode(sb_str(current->buf) + i, &c);
        return c;
    }
    return -1;
}

static int char_display_width(int ch)
{
    if (ch < ' ') {
        /* control chars take two positions */
        return 2;
    }
    else {
        return utf8_width(ch);
    }
}

#ifndef NO_COMPLETION
static linenoiseCompletionCallback *completionCallback = NULL;
static void *completionUserdata = NULL;
static int showhints = 1;
static linenoiseHintsCallback *hintsCallback = NULL;
static linenoiseFreeHintsCallback *freeHintsCallback = NULL;
static void *hintsUserdata = NULL;

static void beep() {
#ifdef USE_TERMIOS
    fprintf(stderr, "\x7");
    fflush(stderr);
#endif
}

static void freeCompletions(linenoiseCompletions *lc) {
    size_t i;
    for (i = 0; i < lc->len; i++)
        free(lc->cvec[i]);
    free(lc->cvec);
}

static int completeLine(struct current *current) {
    linenoiseCompletions lc = { 0, NULL };
    int c = 0;

    completionCallback(sb_str(current->buf),&lc,completionUserdata);
    if (lc.len == 0) {
        beep();
    } else {
        size_t stop = 0, i = 0;

        while(!stop) {
            /* Show completion or original buffer */
            if (i < lc.len) {
                int chars = utf8_strlen(lc.cvec[i], -1);
                refreshLineAlt(current, current->prompt, lc.cvec[i], chars);
            } else {
                refreshLine(current);
            }

            c = fd_read(current);
            if (c == -1) {
                break;
            }

            switch(c) {
                case '\t': /* tab */
                    i = (i+1) % (lc.len+1);
                    if (i == lc.len) beep();
                    break;
                case CHAR_ESCAPE: /* escape */
                    /* Re-show original buffer */
                    if (i < lc.len) {
                        refreshLine(current);
                    }
                    stop = 1;
                    break;
                default:
                    /* Update buffer and return */
                    if (i < lc.len) {
                        set_current(current,lc.cvec[i]);
                    }
                    stop = 1;
                    break;
            }
        }
    }

    freeCompletions(&lc);
    return c; /* Return last read character */
}

/* Register a callback function to be called for tab-completion.
   Returns the prior callback so that the caller may (if needed)
   restore it when done. */
linenoiseCompletionCallback * linenoiseSetCompletionCallback(linenoiseCompletionCallback *fn, void *userdata) {
    linenoiseCompletionCallback * old = completionCallback;
    completionCallback = fn;
    completionUserdata = userdata;
    return old;
}

void linenoiseAddCompletion(linenoiseCompletions *lc, const char *str) {
    lc->cvec = (char **)realloc(lc->cvec,sizeof(char*)*(lc->len+1));
    lc->cvec[lc->len++] = strdup(str);
}

void linenoiseSetHintsCallback(linenoiseHintsCallback *callback, void *userdata)
{
    hintsCallback = callback;
    hintsUserdata = userdata;
}

void linenoiseSetFreeHintsCallback(linenoiseFreeHintsCallback *callback)
{
    freeHintsCallback = callback;
}

#endif


static const char *reduceSingleBuf(const char *buf, int availcols, int *cursor_pos)
{
    /* We have availcols columns available.
     * If necessary, strip chars off the front of buf until *cursor_pos
     * fits within availcols
     */
    int needcols = 0;
    int pos = 0;
    int new_cursor_pos = *cursor_pos;
    const char *pt = buf;

    DRL("reduceSingleBuf: availcols=%d, cursor_pos=%d\n", availcols, *cursor_pos);

    while (*pt) {
        int ch;
        int n = utf8_tounicode(pt, &ch);
        pt += n;

        needcols += char_display_width(ch);

        /* If we need too many cols, strip
         * chars off the front of buf to make it fit.
         * We keep 3 extra cols to the right of the cursor.
         * 2 for possible wide chars, 1 for the last column that
         * can't be used.
         */
        while (needcols >= availcols - 3) {
            n = utf8_tounicode(buf, &ch);
            buf += n;
            needcols -= char_display_width(ch);
            DRL_CHAR(ch);

            /* and adjust the apparent cursor position */
            new_cursor_pos--;

            if (buf == pt) {
                /* can't remove more than this */
                break;
            }
        }

        if (pos++ == *cursor_pos) {
            break;
        }

    }
    DRL("<snip>");
    DRL_STR(buf);
    DRL("\nafter reduce, needcols=%d, new_cursor_pos=%d\n", needcols, new_cursor_pos);

    /* Done, now new_cursor_pos contains the adjusted cursor position
     * and buf points to he adjusted start
     */
    *cursor_pos = new_cursor_pos;
    return buf;
}

static int mlmode = 0;

void linenoiseSetMultiLine(int enableml)
{
    mlmode = enableml;
}

/* Helper of refreshSingleLine() and refreshMultiLine() to show hints
 * to the right of the prompt. */
static void refreshShowHints(struct current *current, const char *buf, int availcols) {
    if (showhints && hintsCallback && availcols > 0) {
        int bold = 0;
        int color = -1;
        char *hint = hintsCallback(buf, &color, &bold, hintsUserdata);
        if (hint) {
            const char *pt;


            if (bold == 1 && color == -1) color = 37;
            if (bold || color > 0) {
                int props[3] = { bold, color, 49 }; /* bold, color, fgnormal */
                setOutputHighlight(current, props, 3);
            }
            DRL("<hint bold=%d,color=%d>", bold, color);
            pt = hint;
            while (*pt) {
                int ch;
                int n = utf8_tounicode(pt, &ch);
                int width = char_display_width(ch);

                if (width >= availcols) {
                    DRL("<hinteol>");
                    break;
                }
                DRL_CHAR(ch);

                availcols -= width;
                outputChars(current, pt, n);
                pt += n;
            }
            if (bold || color > 0) {
                clearOutputHighlight(current);
            }
            /* Call the function to free the hint returned. */
            if (freeHintsCallback) freeHintsCallback(hint, hintsUserdata);
        }
    }
}

#ifdef USE_TERMIOS
static void refreshStart(struct current *current)
{
    /* We accumulate all output here */
    assert(current->output == NULL);
    current->output = sb_alloc();
}

static void refreshEnd(struct current *current)
{
    /* Output everything at once */
    IGNORE_RC(write(current->fd, sb_str(current->output), sb_len(current->output)));
    sb_free(current->output);
    current->output = NULL;
}

static void refreshStartChars(struct current *current)
{
}

static void refreshNewline(struct current *current)
{
    DRL("<nl>");
    outputChars(current, "\n", 1);
}

static void refreshEndChars(struct current *current)
{
}
#endif

static void refreshLineAlt(struct current *current, const char *prompt, const char *buf, int cursor_pos)
{
    int i;
    const char *pt;
    int displaycol;
    int displayrow;
    int visible;

    int currentpos;
    int notecursor;
    int cursorcol = 0;
    int cursorrow = 0;
    struct esc_parser parser;

#ifdef DEBUG_REFRESHLINE
    dfh = fopen("linenoise.debuglog", "a");
#endif

    /* Should intercept SIGWINCH. For now, just get the size every time */
    getWindowSize(current);

    refreshStart(current);






    DRL("wincols=%d, cursor_pos=%d, nrows=%d, rpos=%d\n", current->cols, cursor_pos, current->nrows, current->rpos);

    /* Here is the plan:
     * (a) move the the bottom row, going down the appropriate number of lines
     * (b) move to beginning of line and erase the current line
     * (c) go up one line and do the same, until we have erased up to the first row
     * (d) output the prompt, counting cols and rows, taking into account escape sequences
     * (e) output the buffer, counting cols and rows
     *   (e') when we hit the current pos, save the cursor position
     * (f) move the cursor to the saved cursor position
     * (g) save the current cursor row and number of rows
     */




    /* (a) - The cursor is currently at row rpos */
    cursorDown(current, current->nrows - current->rpos - 1);
    DRL("<cud=%d>", current->nrows - current->rpos - 1);

    /* (b), (c) - Erase lines upwards until we get to the first row */
    for (i = 0; i < current->nrows; i++) {
        if (i) {
            DRL("<cup>");
            cursorUp(current, 1);
        }
        DRL("<clearline>");
        cursorToLeft(current);
        eraseEol(current);
    }
    DRL("\n");

    /* (d) First output the prompt. control sequences don't take up display space */
    pt = prompt;
    displaycol = 0; /* current display column */
    displayrow = 0; /* current display row */
    visible = 1;

    refreshStartChars(current);

    while (*pt) {
        int width;
        int ch;
        int n = utf8_tounicode(pt, &ch);



        if (visible && ch == CHAR_ESCAPE) {
            /* The start of an escape sequence, so not visible */
            visible = 0;
            initParseEscapeSeq(&parser, 'm');
            DRL("<esc-seq-start>");
        }



        if (ch == '\n' || ch == '\r') {
            /* treat both CR and NL the same and force wrap */
            refreshNewline(current);
            displaycol = 0;
            displayrow++;
        }
        else {
            width = visible * utf8_width(ch);




            displaycol += width;
            if (displaycol >= current->cols) {
                /* need to wrap to the next line because of newline or if it doesn't fit
                 * XXX this is a problem in single line mode
                 */




                refreshNewline(current);
                displaycol = width;
                displayrow++;
            }





            DRL_CHAR(ch);
#ifdef USE_WINCONSOLE
            if (visible) {
                outputChars(current, pt, n);
            }


#else
            outputChars(current, pt, n);
#endif
        }

        pt += n;



        if (!visible) {
            switch (parseEscapeSequence(&parser, ch)) {
                case EP_END:
                    visible = 1;
                    setOutputHighlight(current, parser.props, parser.numprops);
                    DRL("<esc-seq-end,numprops=%d>", parser.numprops);
                    break;
                case EP_ERROR:
                    DRL("<esc-seq-err>");
                    visible = 1;
                    break;
            }
        }
    }

    /* Now we are at the first line with all lines erased */
    DRL("\nafter prompt: displaycol=%d, displayrow=%d\n", displaycol, displayrow);


    /* (e) output the buffer, counting cols and rows */
    if (mlmode == 0) {
        /* In this mode we may need to trim chars from the start of the buffer until the
         * cursor fits in the window.
         */




        pt = reduceSingleBuf(buf, current->cols - displaycol, &cursor_pos);
    }

    else {
        pt = buf;
    }

    currentpos = 0;
    notecursor = -1;

    while (*pt) {
        int ch;
        int n = utf8_tounicode(pt, &ch);


        int width = char_display_width(ch);

        if (currentpos == cursor_pos) {
            /* (e') wherever we output this character is where we want the cursor */
            notecursor = 1;
        }


        if (displaycol + width >= current->cols) {
            if (mlmode == 0) {
                /* In single line mode stop once we print as much as we can on one line */
                DRL("<slmode>");
                break;
            }
            /* need to wrap to the next line since it doesn't fit */
            refreshNewline(current);
            displaycol = 0;
            displayrow++;
        }

        if (notecursor == 1) {
            /* (e') Save this position as the current cursor position */
            cursorcol = displaycol;
            cursorrow = displayrow;
            notecursor = 0;
            DRL("<cursor>");
        }

        displaycol += width;

        if (ch < ' ') {




            outputControlChar(current, ch + '@');


        }

        else {
            outputChars(current, pt, n);
        }
        DRL_CHAR(ch);
        if (width != 1) {
            DRL("<w=%d>", width);
        }

        pt += n;
        currentpos++;
    }

    /* If we didn't see the cursor, it is at the current location */
    if (notecursor) {
        DRL("<cursor>");
        cursorcol = displaycol;
        cursorrow = displayrow;
    }

    DRL("\nafter buf: displaycol=%d, displayrow=%d, cursorcol=%d, cursorrow=%d\n\n", displaycol, displayrow, cursorcol, cursorrow);

    /* (f) show hints */
    refreshShowHints(current, buf, current->cols - displaycol);


    refreshEndChars(current);

    /* (g) move the cursor to the correct place */
    cursorUp(current, displayrow - cursorrow);
    setCursorPos(current, cursorcol);

    /* (h) Update the number of rows if larger, but never reduce this */
    if (displayrow >= current->nrows) {
        current->nrows = displayrow + 1;
    }
    /* And remember the row that the cursor is on */
    current->rpos = cursorrow;

    refreshEnd(current);

#ifdef DEBUG_REFRESHLINE
    fclose(dfh);
#endif
}

static void refreshLine(struct current *current)
{




    refreshLineAlt(current, current->prompt, sb_str(current->buf), current->pos);
}

static void set_current(struct current *current, const char *str)
{

    sb_clear(current->buf);
    sb_append(current->buf, str);
    current->pos = sb_chars(current->buf);
}

/**
 * Removes the char at 'pos'.
 *
 * Returns 1 if the line needs to be refreshed, 2 if not
 * and 0 if nothing was removed
 */
static int remove_char(struct current *current, int pos)
{
    if (pos >= 0 && pos < sb_chars(current->buf)) {
        int offset = utf8_index(sb_str(current->buf), pos);
        int nbytes = utf8_index(sb_str(current->buf) + offset, 1);



        /* Note that we no longer try to optimise the remove-at-end case
         * since control characters and wide characters mess
         * up the simple count
         */
        sb_delete(current->buf, offset, nbytes);












        if (current->pos > pos) {
            current->pos--;
        }
        return 1;
    }
    return 0;
}

/**
 * Insert 'ch' at position 'pos'
 *
 * Returns 1 if the line needs to be refreshed, 2 if not
 * and 0 if nothing was inserted (no room)
 */
static int insert_char(struct current *current, int pos, int ch)
{
    if (pos >= 0 && pos <= sb_chars(current->buf)) {
        char buf[MAX_UTF8_LEN + 1];
        int offset = utf8_index(sb_str(current->buf), pos);
        int n = utf8_getchars(buf, ch);



        /* null terminate since sb_insert() requires it */
        buf[n] = 0;








        /* Optimisation removed - see reason in remove_char() */





        sb_insert(current->buf, offset, buf);



        if (current->pos >= pos) {
            current->pos++;
        }
        return 1;
    }
    return 0;
}

/**
 * Captures up to 'n' characters starting at 'pos' for the cut buffer.
 *
 * This replaces any existing characters in the cut buffer.
 */
static void capture_chars(struct current *current, int pos, int nchars)
{
    if (pos >= 0 && (pos + nchars - 1) < sb_chars(current->buf)) {
        int offset = utf8_index(sb_str(current->buf), pos);
        int nbytes = utf8_index(sb_str(current->buf) + offset, nchars);

        if (nbytes) {
            if (current->capture) {

                sb_clear(current->capture);
            }
            else {
                current->capture = sb_alloc();
            }
            sb_append_len(current->capture, sb_str(current->buf) + offset, nbytes);
        }
    }
}

/**
 * Removes up to 'n' characters at cursor position 'pos'.
 *
................................................................................
        inserted++;
        pos++;
        chars += n;
    }
    return inserted;
}


/**
 * Returns the keycode to process, or 0 if none.
 */
static int reverseIncrementalSearch(struct current *current)
{

    /* Display the reverse-i-search prompt and process chars */
    char rbuf[50];
    char rprompt[80];
    int rchars = 0;
    int rlen = 0;
    int searchpos = history_len - 1;
    int c;

    rbuf[0] = 0;
    while (1) {
        int n = 0;
        const char *p = NULL;
        int skipsame = 0;
        int searchdir = -1;

        snprintf(rprompt, sizeof(rprompt), "(reverse-i-search)'%s': ", rbuf);
        refreshLineAlt(current, rprompt, sb_str(current->buf), current->pos);
        c = fd_read(current);
        if (c == ctrl('H') || c == CHAR_DELETE) {
            if (rchars) {
                int p = utf8_index(rbuf, --rchars);
                rbuf[p] = 0;
                rlen = strlen(rbuf);
            }
            continue;
        }
#ifdef USE_TERMIOS


        if (c == CHAR_ESCAPE) {
            c = check_special(current->fd);
        }
#endif
        if (c == ctrl('P') || c == SPECIAL_UP) {
            /* Search for the previous (earlier) match */
            if (searchpos > 0) {
                searchpos--;
            }
            skipsame = 1;
        }





        else if (c == ctrl('N') || c == SPECIAL_DOWN) {
            /* Search for the next (later) match */
            if (searchpos < history_len) {
                searchpos++;
            }
            searchdir = 1;
            skipsame = 1;
        }



        else if (c >= ' ') {
            /* >= here to allow for null terminator */
            if (rlen >= (int)sizeof(rbuf) - MAX_UTF8_LEN) {
                continue;
            }
















            n = utf8_getchars(rbuf + rlen, c);
            rlen += n;
            rchars++;
            rbuf[rlen] = 0;

            /* Adding a new char resets the search location */
            searchpos = history_len - 1;
        }


        else {
            /* Exit from incremental search mode */
            break;
        }










        /* Now search through the history for a match */
        for (; searchpos >= 0 && searchpos < history_len; searchpos += searchdir) {
            p = strstr(history[searchpos], rbuf);
            if (p) {
                /* Found a match */
                if (skipsame && strcmp(history[searchpos], sb_str(current->buf)) == 0) {
                    /* But it is identical, so skip it */
                    continue;
                }

                /* Copy the matching line and set the cursor position */
                set_current(current,history[searchpos]);
                current->pos = utf8_strlen(history[searchpos], p - history[searchpos]);
                break;




            }


        }
        if (!p && n) {
            /* No match, so don't add it */
            rchars--;
            rlen -= n;
            rbuf[rlen] = 0;
        }
    }
    if (c == ctrl('G') || c == ctrl('C')) {
        /* ctrl-g terminates the search with no effect */
        set_current(current, "");
        c = 0;
    }


    else if (c == ctrl('J')) {
        /* ctrl-j terminates the search leaving the buffer in place */
        c = 0;
    }








    /* Go process the char normally */
    refreshLine(current);
    return c;
}








static int linenoiseEdit(struct current *current) {
    int history_index = 0;

    /* The latest history entry is always our current buffer, that
     * initially is just an empty string. */
    linenoiseHistoryAdd("");

    set_current(current, "");
    refreshLine(current);

    while(1) {
        int dir = -1;
        int c = fd_read(current);

#ifndef NO_COMPLETION
        /* Only autocomplete when the callback is set. It returns < 0 when
         * there was an error reading from fd. Otherwise it will return the
         * character that should be handled next. */
        if (c == '\t' && current->pos == sb_chars(current->buf) && completionCallback != NULL) {
            c = completeLine(current);




        }
#endif
        if (c == ctrl('R')) {
            /* reverse incremental search will provide an alternative keycode or 0 for none */
            c = reverseIncrementalSearch(current);
            /* go on to process the returned char normally */
        }



#ifdef USE_TERMIOS
        if (c == CHAR_ESCAPE) {   /* escape sequence */
            c = check_special(current->fd);
        }
#endif
        if (c == -1) {
            /* Return on errors */
            return sb_len(current->buf);
        }

        switch(c) {
        case SPECIAL_NONE:
            break;
        case '\r':    /* enter */
            history_len--;
            free(history[history_len]);
            current->pos = sb_chars(current->buf);
            if (mlmode || hintsCallback) {
                showhints = 0;
                refreshLine(current);
                showhints = 1;
            }
            return sb_len(current->buf);
        case ctrl('C'):     /* ctrl-c */
            errno = EAGAIN;
            return -1;
        case ctrl('Z'):     /* ctrl-z */
#ifdef SIGTSTP
            /* send ourselves SIGSUSP */
            disableRawMode(current);
            raise(SIGTSTP);
            /* and resume */
            enableRawMode(current);
            refreshLine(current);
#endif
            continue;
        case CHAR_DELETE:   /* backspace */
        case ctrl('H'):
            if (remove_char(current, current->pos - 1) == 1) {
                refreshLine(current);
            }
            break;
        case ctrl('D'):     /* ctrl-d */
            if (sb_len(current->buf) == 0) {
                /* Empty line, so EOF */
                history_len--;
                free(history[history_len]);
                return -1;
            }
            /* Otherwise fall through to delete char to right of cursor */
        case SPECIAL_DELETE:
            if (remove_char(current, current->pos) == 1) {
                refreshLine(current);
            }
            break;
        case SPECIAL_INSERT:
            /* Ignore. Expansion Hook.
             * Future possibility: Toggle Insert/Overwrite Modes
             */
            break;
................................................................................

                /* now eat any non-spaces on the left */
                while (pos > 0 && get_char(current, pos - 1) != ' ') {
                    pos--;
                }

                if (remove_chars(current, pos, current->pos - pos)) {
                    refreshLine(current);
                }
            }
            break;






































































































        case ctrl('T'):    /* ctrl-t */
            if (current->pos > 0 && current->pos <= sb_chars(current->buf)) {
                /* If cursor is at end, transpose the previous two chars */
                int fixer = (current->pos == sb_chars(current->buf));
                c = get_char(current, current->pos - fixer);
                remove_char(current, current->pos - fixer);
                insert_char(current, current->pos - 1, c);
                refreshLine(current);
            }
            break;
        case ctrl('V'):    /* ctrl-v */

            /* Insert the ^V first */
            if (insert_char(current, current->pos, c)) {
                refreshLine(current);
                /* Now wait for the next char. Can insert anything except \0 */
                c = fd_read(current);

                /* Remove the ^V first */
                remove_char(current, current->pos - 1);
                if (c > 0) {
                    /* Insert the actual char, can't be error or null */
                    insert_char(current, current->pos, c);
                }
                refreshLine(current);

            }
            break;
        case ctrl('B'):
        case SPECIAL_LEFT:
            if (current->pos > 0) {
                current->pos--;
                refreshLine(current);
            }
            break;
        case ctrl('F'):
        case SPECIAL_RIGHT:
            if (current->pos < sb_chars(current->buf)) {
                current->pos++;
                refreshLine(current);
            }
            break;
        case SPECIAL_PAGE_UP:
          dir = history_len - history_index - 1; /* move to start of history */
          goto history_navigation;
        case SPECIAL_PAGE_DOWN:
          dir = -history_index; /* move to 0 == end of history, i.e. current */
................................................................................
        case ctrl('N'):
        case SPECIAL_DOWN:
history_navigation:
            if (history_len > 1) {
                /* Update the current history entry before to
                 * overwrite it with tne next one. */
                free(history[history_len - 1 - history_index]);
                history[history_len - 1 - history_index] = strdup(sb_str(current->buf));
                /* Show the new entry */
                history_index += dir;
                if (history_index < 0) {
                    history_index = 0;
                    break;
                } else if (history_index >= history_len) {
                    history_index = history_len - 1;
                    break;
                }
                set_current(current, history[history_len - 1 - history_index]);
                refreshLine(current);
            }
            break;
        case ctrl('A'): /* Ctrl+a, go to the start of the line */
        case SPECIAL_HOME:
            current->pos = 0;
            refreshLine(current);
            break;
        case ctrl('E'): /* ctrl+e, go to the end of the line */
        case SPECIAL_END:
            current->pos = sb_chars(current->buf);
            refreshLine(current);
            break;
        case ctrl('U'): /* Ctrl+u, delete to beginning of line, save deleted chars. */
            if (remove_chars(current, 0, current->pos)) {
                refreshLine(current);
            }
            break;
        case ctrl('K'): /* Ctrl+k, delete from current to end of line, save deleted chars. */
            if (remove_chars(current, current->pos, sb_chars(current->buf) - current->pos)) {
                refreshLine(current);
            }
            break;
        case ctrl('Y'): /* Ctrl+y, insert saved chars at current position */
            if (current->capture && insert_chars(current, current->pos, sb_str(current->capture))) {
                refreshLine(current);
            }
            break;
        case ctrl('L'): /* Ctrl+L, clear screen */
            linenoiseClearScreen();
            /* Force recalc of window size for serial terminals */
            current->cols = 0;
            current->rpos = 0;
            refreshLine(current);
            break;
        default:
            /* Only tab is allowed without ^V */
            if (c == '\t' || c >= ' ') {
                if (insert_char(current, current->pos, c) == 1) {
                    refreshLine(current);
                }
            }
            break;
        }
    }
    return sb_len(current->buf);
}

int linenoiseColumns(void)
{
    struct current current;
    enableRawMode (&current);
    getWindowSize (&current);
    disableRawMode (&current);
    return current.cols;
}

/**
 * Reads a line from the file handle (without the trailing NL or CRNL)
 * and returns it in a stringbuf.
 * Returns NULL if no characters are read before EOF or error.
 *
 * Note that the character count will *not* be correct for lines containing
 * utf8 sequences. Do not rely on the character count.
 */
static stringbuf *sb_getline(FILE *fh)
{
    stringbuf *sb = sb_alloc();
    int c;
    int n = 0;

    while ((c = getc(fh)) != EOF) {
        char ch;
        n++;
        if (c == '\r') {
            /* CRLF -> LF */
            continue;
        }
        if (c == '\n' || c == '\r') {
            break;
        }
        ch = c;
        /* ignore the effect of character count for partial utf8 sequences */
        sb_append_len(sb, &ch, 1);
    }
    if (n == 0) {
        sb_free(sb);
        return NULL;
    }
    return sb;
}

char *linenoise(const char *prompt)
{
    int count;
    struct current current;
    stringbuf *sb;

    memset(&current, 0, sizeof(current));

    if (enableRawMode(&current) == -1) {
        printf("%s", prompt);
        fflush(stdout);
        sb = sb_getline(stdin);

    }






    else {

        current.buf = sb_alloc();



        current.pos = 0;
        current.nrows = 1;
        current.prompt = prompt;


        count = linenoiseEdit(&current);

        disableRawMode(&current);
        printf("\n");

        sb_free(current.capture);
        if (count == -1) {
            sb_free(current.buf);
            return NULL;
        }
        sb = current.buf;
    }

    return sb ? sb_to_string(sb) : NULL;
}

/* Using a circular buffer is smarter, but a bit more complex to handle. */
int linenoiseHistoryAddAllocated(char *line) {


    if (history_max_len == 0) {
notinserted:
        free(line);
        return 0;
    }
    if (history == NULL) {



        history = (char **)calloc(sizeof(char*), history_max_len);
    }

    /* do not insert duplicate lines into history */
    if (history_len > 0 && strcmp(line, history[history_len - 1]) == 0) {
        goto notinserted;
    }



    if (history_len == history_max_len) {
        free(history[0]);
        memmove(history,history+1,sizeof(char*)*(history_max_len-1));
        history_len--;
    }
    history[history_len] = line;
    history_len++;
    return 1;
}

int linenoiseHistoryAdd(const char *line) {
    return linenoiseHistoryAddAllocated(strdup(line));
}

int linenoiseHistoryGetMaxLen(void) {
    return history_max_len;
}

int linenoiseHistorySetMaxLen(int len) {
    char **newHistory;

    if (len < 1) return 0;
    if (history) {
        int tocopy = history_len;

        newHistory = (char **)calloc(sizeof(char*), len);


        /* If we can't copy everything, free the elements we'll not use. */
        if (len < tocopy) {
            int j;

            for (j = 0; j < tocopy-len; j++) free(history[j]);
            tocopy = len;
        }

        memcpy(newHistory,history+(history_len-tocopy), sizeof(char*)*tocopy);
        free(history);
        history = newHistory;
    }
    history_max_len = len;
    if (history_len > history_max_len)
        history_len = history_max_len;
................................................................................
        fputc('\n', fp);
    }

    fclose(fp);
    return 0;
}

/* Load the history from the specified file.

 *
 * If the file does not exist or can't be opened, no operation is performed
 * and -1 is returned.
 * Otherwise 0 is returned.
 */
int linenoiseHistoryLoad(const char *filename) {
    FILE *fp = fopen(filename,"r");

    stringbuf *sb;

    if (fp == NULL) return -1;

    while ((sb = sb_getline(fp)) != NULL) {
        /* Take the stringbuf and decode backslash escaped values */
        char *buf = sb_to_string(sb);
        char *dest = buf;
        const char *src;


        for (src = buf; *src; src++) {
            char ch = *src;

            if (ch == '\\') {
                src++;
                if (*src == 'n') {
                    ch = '\n';
                }
................................................................................
                    ch = '\r';
                } else {
                    ch = *src;
                }
            }
            *dest++ = ch;
        }




        *dest = 0;

        linenoiseHistoryAddAllocated(buf);
    }
    fclose(fp);
    return 0;
}

/* Provide access to the history buffer.
 *

Changes to linenoise.h.

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125
linenoiseCompletionCallback * linenoiseSetCompletionCallback(linenoiseCompletionCallback *comp, void *userdata);

/*
 * Adds a copy of the given string to the given completion list. The copy is owned
 * by the linenoiseCompletions object.
 */
void linenoiseAddCompletion(linenoiseCompletions *comp, const char *str);






#endif

/*
 * Prompts for input using the given string as the input
 * prompt. Returns when the user has tapped ENTER or (on an empty
 * line) EOF (Ctrl-D on Unix, Ctrl-Z on Windows). Returns either
 * a copy of the entered string (for ENTER) or NULL (on EOF).  The
................................................................................
char **linenoiseHistory(int *len);

/*
 * Returns the number of display columns in the current terminal.
 */
int linenoiseColumns(void);






#endif /* __LINENOISE_H */







>
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linenoiseCompletionCallback * linenoiseSetCompletionCallback(linenoiseCompletionCallback *comp, void *userdata);

/*
 * Adds a copy of the given string to the given completion list. The copy is owned
 * by the linenoiseCompletions object.
 */
void linenoiseAddCompletion(linenoiseCompletions *comp, const char *str);

typedef char*(linenoiseHintsCallback)(const char *, int *color, int *bold, void *userdata);
typedef void(linenoiseFreeHintsCallback)(void *hint, void *userdata);
void linenoiseSetHintsCallback(linenoiseHintsCallback *callback, void *userdata);
void linenoiseSetFreeHintsCallback(linenoiseFreeHintsCallback *callback);

#endif

/*
 * Prompts for input using the given string as the input
 * prompt. Returns when the user has tapped ENTER or (on an empty
 * line) EOF (Ctrl-D on Unix, Ctrl-Z on Windows). Returns either
 * a copy of the entered string (for ENTER) or NULL (on EOF).  The
................................................................................
char **linenoiseHistory(int *len);

/*
 * Returns the number of display columns in the current terminal.
 */
int linenoiseColumns(void);

/**
 * Enable or disable multiline mode (disabled by default)
 */
void linenoiseSetMultiLine(int enableml);

#endif /* __LINENOISE_H */