getline.c

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/*
 * Copyright (C) 1991, 1992, 1993 by Chris Thewalt (thewalt@ce.berkeley.edu)
 *
 * Permission to use, copy, modify, and distribute this software
 * for any purpose and without fee is hereby granted, provided
 * that the above copyright notices appear in all copies and that both the
 * copyright notice and this permission notice appear in supporting
 * documentation.  This software is provided "as is" without express or
 * implied warranty.
 *
 * Thanks to the following people who have provided enhancements and fixes:
 *   Ron Ueberschaer, Christoph Keller, Scott Schwartz, Steven List,
 *   DaviD W. Sanderson, Goran Bostrom, Michael Gleason, Glenn Kasten,
 *   Edin Hodzic, Eric J Bivona, Kai Uwe Rommel, Danny Quah, Ulrich Betzler
 */
 
/*
 * Note:  This version has been updated by Mike Gleason <mgleason@ncftp.com>
 */
 
static const char copyright[] = "getline:  Copyright (C) 1991, 1992, 1993, Chris Thewalt";
 
#   include <windows.h>
#   include <sys/types.h>
#   include <sys/stat.h>
#   include <errno.h>
#   include <conio.h>
#   include <io.h>
#   include <fcntl.h>
// #    define strcasecmp stricmp
// #    define strncasecmp strnicmp
#   define sleep(a) Sleep(a * 1000)
#   ifndef S_ISREG
#       define S_ISREG(m)      (((m) & _S_IFMT) == _S_IFREG)
#       define S_ISDIR(m)      (((m) & _S_IFMT) == _S_IFDIR)
#   endif
#   ifndef open
#       define open _open
#       define write _write
#       define read _read
#       define close _close
#       define lseek _lseek
#       define stat _stat
#       define lstat _stat
#       define fstat _fstat
#       define dup _dup
#       define utime _utime
#       define utimbuf _utimbuf
#   endif
#   ifndef unlink
#       define unlink remove
#   endif
#   define NO_SIGNALS 1
#   define LOCAL_PATH_DELIM '\\'
#   define LOCAL_PATH_DELIM_STR "\\"
#   define LOCAL_PATH_ALTDELIM '/'
#   define IsLocalPathDelim(c) ((c == LOCAL_PATH_DELIM) || (c == LOCAL_PATH_ALTDELIM))
#   define UNC_PATH_PREFIX "\\\\"
#   define IsUNCPrefixed(s) (IsLocalPathDelim(s[0]) && IsLocalPathDelim(s[1]))
#   define __windows__ 1
 
/********************* C library headers ********************************/
 
#include <stdio.h>
#include <string.h>
#ifdef HAVE_STRINGS_H
#   include <strings.h>
#endif
#include <stdlib.h>
#include <ctype.h>
#include <signal.h>
 
#define _getline_c_ 1
#include "getline.h"
 
static int gl_tab(char *buf, int offset, int *loc, size_t bufsize);
 
/******************** external interface *********************************/
 
gl_in_hook_proc gl_in_hook = 0;
gl_out_hook_proc gl_out_hook = 0;
gl_tab_hook_proc gl_tab_hook = gl_tab;
size_t gl_strlen(const char *s) { return strlen(s); }
gl_tab_completion_proc gl_completion_proc = 0;
int gl_filename_quoting_desired = -1;   /* default to unspecified */
const char *gl_filename_quote_characters = " \t*?<>|;&()[]$`";
int gl_ellipses_during_completion = 1;
int gl_completion_exact_match_extra_char;
char gl_buf[GL_BUF_SIZE];       /* input buffer */
 
/******************** internal interface *********************************/
 
 
static int      gl_init_done = -1;  /* terminal mode flag  */
static int      gl_termw = 80;      /* actual terminal width */
static int      gl_termh = 24;      /* actual terminal height */
static int      gl_scroll = 27;     /* width of EOL scrolling region */
static int      gl_width = 0;       /* net size available for input */
static int      gl_extent = 0;      /* how far to redraw, 0 means all */
static int      gl_overwrite = 0;   /* overwrite mode */
static int      gl_pos = 0, gl_cnt = 0; /* position and size of input */
static char     gl_killbuf[GL_BUF_SIZE]=""; /* killed text */
static const char *gl_prompt;       /* to save the prompt string */
static char     gl_intrc = 0;       /* keyboard SIGINT char */
static char     gl_quitc = 0;       /* keyboard SIGQUIT char */
// static char     gl_suspc = 0;        /* keyboard SIGTSTP char */
// static char     gl_dsuspc = 0;       /* delayed SIGTSTP char */
static int      gl_search_mode = 0; /* search mode flag */
static char   **gl_matchlist = 0;
static char    *gl_home_dir = NULL;
static int      gl_vi_preferred = -1;
static int      gl_vi_mode = 0;
static int  gl_result = GL_OK;
 
static void     gl_init(void);      /* prepare to edit a line */
static void     gl_cleanup(void);   /* to undo gl_init */
static void     gl_char_init(void); /* get ready for no echo input */
static void     gl_char_cleanup(void);  /* undo gl_char_init */
                    /* returns printable prompt width */
 
static void     gl_addchar(int c);  /* install specified char */
static void     gl_del(int loc, int);   /* del, either left (-1) or cur (0) */
static void     gl_error(const char *const buf);    /* write error msg and die */
static void     gl_fixup(const char *prompt, int change, int cursor);       /* fixup state variables and screen */
static int      gl_getc(void);      /* read one char from terminal */
static int      gl_getcx(int);      /* read one char from terminal, if available before timeout */
static void     gl_kill(int pos);   /* delete to EOL */
static void     gl_newline(void);   /* handle \n or \r */
static void     gl_putc(int c);     /* write one char to terminal */
static void     gl_puts(const char *const buf); /* write a line to terminal */
static void     gl_redraw(void);    /* issue \n and redraw all */
static void     gl_transpose(void); /* transpose two chars */
static void     gl_yank(void);      /* yank killed text */
static void     gl_word(int direction); /* move a word */
static void     gl_killword(int direction);
 
static void     hist_init(void);    /* initializes hist pointers */
static char    *hist_next(void);    /* return ptr to next item */
static char    *hist_prev(void);    /* return ptr to prev item */
static char    *hist_save(char *p); /* makes copy of a string, without NL */
 
static void     search_addchar(int c);  /* increment search string */
static void     search_term(void);  /* reset with current contents */
static void     search_back(int new_search);        /* look back for current string */
static void     search_forw(int new_search);        /* look forw for current string */
static void     gl_beep(void);          /* try to play a system beep sound */
 
static int      gl_do_tab_completion(char *buf, int *loc, size_t bufsize, int tabtab);
 
/************************ nonportable part *********************************/
 
#ifdef MSDOS
#include <bios.h>
#endif
 
static void
gl_char_init(void)          /* turn off input echo */
{
#ifdef __unix__
#   ifdef HAVE_TERMIOS_H        /* Use POSIX */
        if (tcgetattr(0, &old_termios) == 0) {
            gl_intrc = old_termios.c_cc[VINTR];
            gl_quitc = old_termios.c_cc[VQUIT];
#       ifdef VSUSP
            gl_suspc = old_termios.c_cc[VSUSP];
#       endif
#       ifdef VDSUSP
            gl_dsuspc = old_termios.c_cc[VDSUSP];
#       endif
        }
        new_termios = old_termios;
        new_termios.c_iflag &= ~(BRKINT|ISTRIP|IXON|IXOFF);
        new_termios.c_iflag |= (IGNBRK|IGNPAR);
        new_termios.c_lflag &= ~(ICANON|ISIG|IEXTEN|ECHO);
        new_termios.c_cc[VMIN] = 1;
        new_termios.c_cc[VTIME] = 0;
        tcsetattr(0, TCSANOW, &new_termios);
#   elif defined(TIOCSETN)      /* BSD */
        if (ioctl(0, TIOCGETC, &tch) == 0) {
            gl_intrc = tch.t_intrc;
            gl_quitc = tch.t_quitc;
        }
        ioctl(0, TIOCGLTC, &ltch);
        gl_suspc = ltch.t_suspc;
        gl_dsuspc = ltch.t_dsuspc;
        ioctl(0, TIOCGETP, &old_tty);
        new_tty = old_tty;
        new_tty.sg_flags |= RAW;
        new_tty.sg_flags &= ~ECHO;
        ioctl(0, TIOCSETN, &new_tty);
#   else                /* SYSV */
        if (ioctl(0, TCGETA, &old_termio) == 0) {
            gl_intrc = old_termio.c_cc[VINTR];
            gl_quitc = old_termio.c_cc[VQUIT];
        }
        new_termio = old_termio;
        new_termio.c_iflag &= ~(BRKINT|ISTRIP|IXON|IXOFF);
        new_termio.c_iflag |= (IGNBRK|IGNPAR);
        new_termio.c_lflag &= ~(ICANON|ISIG|ECHO);
        new_termio.c_cc[VMIN] = 1;
        new_termio.c_cc[VTIME] = 0;
        ioctl(0, TCSETA, &new_termio);
#   endif
#endif /* __unix__ */
}
 
static void
gl_char_cleanup(void)       /* undo effects of gl_char_init */
{
#ifdef __unix__
#   ifdef HAVE_TERMIOS_H
        tcsetattr(0, TCSANOW, &old_termios);
#   elif defined(TIOCSETN)      /* BSD */
        ioctl(0, TIOCSETN, &old_tty);
#   else            /* SYSV */
        ioctl(0, TCSETA, &old_termio);
#   endif
#endif /* __unix__ */
}
 
 
 
int
gl_get_result(void)
{
    return (gl_result);
}   /* gl_get_result */
 
 
 
 
#if defined(MSDOS) || defined(__windows__)
 
#define K_UP                0x48
#define K_DOWN              0x50
#define K_LEFT              0x4B
#define K_RIGHT             0x4D
#define K_DELETE            0x53
#define K_INSERT            0x52
#define K_HOME              0x47
#define K_END               0x4F
#define K_PGUP              0x49
#define K_PGDN              0x51
 
int pc_keymap(int c)
{
    switch (c) {
    case K_UP:
    case K_PGUP:
        c = 16;     /* up -> ^P */
        break;
    case K_DOWN:
    case K_PGDN:
        c = 14;     /* down -> ^N */
        break;
    case K_LEFT:
        c = 2;      /* left -> ^B */
        break;
    case K_RIGHT:
        c = 6;      /* right -> ^F */
        break;
    case K_END:
        c = 5;      /* end -> ^E */
        break;
    case K_HOME:
        c = 1;      /* home -> ^A */
        break;
    case K_INSERT:
        c = 15;     /* insert -> ^O */
        break;
    case K_DELETE:
        c = 4;      /* del -> ^D */
        break;
    default:
        c = 0;    /* make it garbage */
    }
    return c;
}
#endif /* defined(MSDOS) || defined(__windows__) */
 
static int
gl_getc(void)
/* get a character without echoing it to screen */
{
    int             c;
#ifdef __unix__
    char            ch;
#endif
 
#ifdef __unix__
    ch = '\0';
    while ((c = (int) read(0, &ch, 1)) == -1) {
    if (errno != EINTR)
        break;
    }
    if (c != (-1))
        c = (int) ch;
#endif  /* __unix__ */
#ifdef MSDOS
    c = _bios_keybrd(_NKEYBRD_READ);
    if ((c & 0377) == 224) {
    c = pc_keymap((c >> 8) & 0377);
    } else {
    c &= 0377;
    }
#endif /* MSDOS */
#ifdef __windows__
    c = (int) _getch();
    if ((c == 0) || (c == 0xE0)) {
        /* Read key code */
        c = (int) _getch();
        c = pc_keymap(c);
    } else if (c == '\r') {
        /* Note: we only get \r from the console,
         * and not a matching \n.
         */
        c = '\n';
    }
#endif
    return c;
}
 
 
 
#ifdef __unix__
 
static int
gl_getcx(int tlen)
/* Get a character without echoing it to screen, timing out
 * after tlen tenths of a second.
 */
{
    int c, result;
    char ch;
    fd_set ss;
    struct timeval tv;
 
    for (errno = 0;;) {
        FD_ZERO(&ss);
        FD_SET(0, &ss);     /* set STDIN_FILENO */
        tv.tv_sec = tlen / 10;
        tv.tv_usec = (tlen % 10) * 100000L;
        result = select(1, &ss, NULL, NULL, &tv);
        if (result == 1) {
            /* ready */
            break;
        } else if (result == 0) {
            errno = ETIMEDOUT;
            return (-2);
        } else if (errno != EINTR) {
            return (-1);
        }
    }
 
    for (errno = 0;;) {
        c = (int) read(0, &ch, 1);
        if (c == 1)
            return ((int) ch);
        if (errno != EINTR)
            break;
    }
 
    return (-1);
}   /* gl_getcx */
 
#endif  /* __unix__ */
 
 
 
 
#ifdef __windows__
 
static int
gl_getcx(int tlen)
{
    int i, c;
 
    c = (-2);
    tlen -= 2;  /* Adjust for 200ms overhead */
    if (tlen < 1)
        tlen = 1;
    for (i=0; i<tlen; i++) {
        if (_kbhit()) {
            c = (int) _getch();
            if ((c == 0) || (c == 0xE0)) {
                /* Read key code */
                c = (int) _getch();
                c = pc_keymap(c);
                break;
            }
        }
        (void) SleepEx((DWORD) (tlen * 100), FALSE);
    }
    return (c);
}   /* gl_getcx */
 
#endif  /* __windows__ */
 
 
 
 
static void
gl_putc(int c)
{
    char   ch = (char) (unsigned char) c;
 
    write(1, &ch, 1);
    if (ch == '\n') {
    ch = '\r';
        write(1, &ch, 1);   /* RAW mode needs '\r', does not hurt */
    }
}
 
/******************** fairly portable part *********************************/
 
static void
gl_puts(const char *const buf)
{
    int len;
 
    if (buf) {
        len = (int) strlen(buf);
        write(1, buf, len);
    }
}
 
static void
gl_error(const char *const buf)
{
    int len = (int) strlen(buf);
 
    gl_cleanup();
    write(2, buf, len);
    exit(1);
}
 
static void
gl_init(void)
/* set up variables and terminal */
{
    const char *cp;
    int w;
 
    if (gl_init_done < 0) {     /* -1 only on startup */
    cp = (const char *) getenv("COLUMNS");
    if (cp != NULL) {
        w = atoi(cp);
        if (w > 20)
            gl_setwidth(w);
    }
    cp = (const char *) getenv("ROWS");
    if (cp != NULL) {
        w = atoi(cp);
        if (w > 10)
            gl_setheight(w);
    }
        hist_init();
    }
    if (_isatty(0) == 0 || _isatty(1) == 0)
    gl_error("\n*** Error: getline(): not interactive, use stdio.\n");
    gl_char_init();
    gl_init_done = 1;
}
 
static void
gl_cleanup(void)
/* undo effects of gl_init, as necessary */
{
    if (gl_init_done > 0)
        gl_char_cleanup();
    gl_init_done = 0;
#ifdef __windows__
    Sleep(40);
    FlushConsoleInputBuffer(GetStdHandle(STD_INPUT_HANDLE));
#endif
}
 
 
static void
gl_check_inputrc_for_vi(void)
{
    FILE *fp;
    char path[256];
 
    /* If the user has a ~/.inputrc file,
     * check it to see if it has a line like
     * "set editing-mode vi".  If it does,
     * we know that the user wants vi
     * emulation rather than emacs.  If the
     * file doesn't exist, it's no big
     * deal since we can also check the
     * $EDITOR environment variable.
     */
    gl_set_home_dir(NULL);
    if (gl_home_dir == NULL)
        return;
 
#ifdef HAVE_SNPRINTF
    snprintf(path, sizeof(path), "%s/%s", gl_home_dir, ".inputrc");
#else
    if (sizeof(path) >= (strlen(gl_home_dir) + strlen("/.inputrc")))
        return;
 
    sprintf(path, "%s%s", gl_home_dir, "/.inputrc");
#endif
 
    fp = fopen(
        path,
#if defined(__windows__) || defined(MSDOS)
        "rt"
#else
        "r"
#endif
    );
 
    if (fp == NULL)
        return;
 
    while (fgets(path, sizeof(path) - 1, fp) != NULL) {
        if ((strstr(path, "editing-mode") != NULL) && (strstr(path, "vi") != NULL)) {
            gl_vi_preferred = 1;
            break;
        }
    }
 
    (void) fclose(fp);
}   /* gl_check_inputrc_for_vi */
 
 
 
void
gl_setwidth(int w)
{
    if (w > 250)
        w = 250;
    if (w > 20) {
    gl_termw = w;
    gl_scroll = w / 3;
    } else {
    gl_error("\n*** Error: minimum screen width is 21\n");
    }
}   /* gl_setwidth */
 
 
 
void
gl_setheight(int w)
{
    if (w > 10) {
    gl_termh = w;
    } else {
    gl_error("\n*** Error: minimum screen height is 10\n");
    }
}   /* gl_setheight */
 
 
 
 
char *
getline(char *prompt)
{
    int             c, loc, tmp, lastch;
    int vi_count, count;
    int vi_delete;
    char vi_countbuf[32];
    char *cp;
 
#ifdef __unix__
    int             sig;
#endif
 
    /* We'll change the result code only if something happens later. */
    gl_result = GL_OK;
 
    /* Even if it appears that "vi" is preferred, we
     * don't start in gl_vi_mode.  They need to hit
     * ESC to go into vi command mode.
     */
    gl_vi_mode = 0;
    vi_count = 0;
    vi_delete = 0;
    if (gl_vi_preferred < 0) {
        gl_vi_preferred = 0;
        cp = (char *) getenv("EDITOR");
        if (cp != NULL)
            gl_vi_preferred = (strstr(cp, "vi") != NULL);
        if (gl_vi_preferred == 0)
            gl_check_inputrc_for_vi();
    }
 
    gl_init();
    gl_prompt = (prompt)? prompt : "";
    gl_buf[0] = 0;
    if (gl_in_hook)
    gl_in_hook(gl_buf);
    gl_fixup(gl_prompt, -2, GL_BUF_SIZE);
    lastch = 0;
 
#ifdef __windows__
    FlushConsoleInputBuffer(GetStdHandle(STD_INPUT_HANDLE));
#endif
 
    while ((c = gl_getc()) != (-1)) {
    gl_extent = 0;      /* reset to full extent */
    /* Note: \n may or may not be considered printable */
    if ((c != '\t') && ((isprint(c) != 0) || ((c & 0x80) != 0))) {
        if (gl_vi_mode > 0) {
            /* "vi" emulation -- far from perfect,
         * but reasonably functional.
         */
vi:
        for (count = 0; ; ) {
            if (isdigit(c)) {
                if (vi_countbuf[sizeof(vi_countbuf) - 2] == '\0')
                    vi_countbuf[strlen(vi_countbuf)] = (char) c;
            } else if (vi_countbuf[0] != '\0') {
                vi_count = atoi(vi_countbuf);
                memset(vi_countbuf, 0, sizeof(vi_countbuf));
            }
            switch (c) {
                case 'b':
                    gl_word(-1);
                    break;
                case 'w':
                    if (vi_delete) {
                        gl_killword(1);
                    } else {
                        gl_word(1);
                    }
                    break;
                case 'h':   /* left */
                    if (vi_delete) {
                        if (gl_pos > 0) {
                                gl_fixup(gl_prompt, -1, gl_pos-1);
                                gl_del(0, 1);
                        }
                    } else {
                            gl_fixup(gl_prompt, -1, gl_pos-1);
                    }
                    break;
                case ' ':
                case 'l':   /* right */
                    if (vi_delete) {
                        gl_del(0, 1);
                    } else {
                        gl_fixup(gl_prompt, -1, gl_pos+1);
                    }
                    break;
                case 'k':   /* up */
                    strcpy(gl_buf, hist_prev());
                    if (gl_in_hook)
                        gl_in_hook(gl_buf);
                    gl_fixup(gl_prompt, 0, GL_BUF_SIZE);
                    break;
                case 'j':   /* down */
                    strcpy(gl_buf, hist_next());
                    if (gl_in_hook)
                        gl_in_hook(gl_buf);
                    gl_fixup(gl_prompt, 0, GL_BUF_SIZE);
                    break;
                case 'd':
                    if (vi_delete == 1) {
                            gl_kill(0);
                        vi_count = 1;
                        vi_delete = 0;
                        gl_vi_mode = 0;
                        goto vi_break;
                    }
                    vi_delete = 1;
                    goto vi_break;
                case '^':   /* start of line */
                    if (vi_delete) {
                        vi_count = gl_pos;
                        gl_fixup(gl_prompt, -1, 0);
                        for (c = 0; c < vi_count; c++) {
                            if (gl_cnt > 0)
                                gl_del(0, 0);
                        }
                        vi_count = 1;
                        vi_delete = 0;
                    } else {
                        gl_fixup(gl_prompt, -1, 0);
                    }
                    break;
                case '$':   /* end of line */
                    if (vi_delete) {
                            gl_kill(gl_pos);
                    } else {
                        loc = (int) strlen(gl_buf);
                        if (loc > 1)
                            loc--;
                        gl_fixup(gl_prompt, -1, loc);
                    }
                    break;
                case 'p':   /* paste after */
                    gl_fixup(gl_prompt, -1, gl_pos+1);
                        gl_yank();
                    break;
                case 'P':   /* paste before */
                        gl_yank();
                    break;
                case 'r':   /* replace character */
                    gl_buf[gl_pos] = (char) gl_getc();
                    gl_fixup(gl_prompt, gl_pos, gl_pos);
                    vi_count = 1;
                    break;
                case 'R':
                    gl_overwrite = 1;
                    gl_vi_mode = 0;
                    break;
                case 'i':
                case 'I':
                    gl_overwrite = 0;
                    gl_vi_mode = 0;
                    break;
                case 'o':
                case 'O':
                case 'a':
                case 'A':
                    gl_overwrite = 0;
                    gl_fixup(gl_prompt, -1, gl_pos+1);
                    gl_vi_mode = 0;
                    break;
            }
            count++;
            if (count >= vi_count)
                break;
        }
        vi_count = 1;
        vi_delete = 0;
vi_break:
        continue;
        } else if (gl_search_mode) {
           search_addchar(c);
        } else {
           gl_addchar(c);
        }
    } else {
        if (gl_search_mode) {
            if (c == '\033' || c == '\016' || c == '\020') {
                search_term();
                c = 0;          /* ignore the character */
        } else if (c == '\010' || c == '\177') {
            search_addchar(-1); /* unwind search string */
            c = 0;
        } else if (c != '\022' && c != '\023') {
            search_term();  /* terminate and handle char */
        }
        }
        switch (c) {
          case '\n': case '\r':             /* newline */
        gl_newline();
        gl_cleanup();
        return gl_buf;
          case '\001': gl_fixup(gl_prompt, -1, 0);      /* ^A */
        break;
          case '\002': gl_fixup(gl_prompt, -1, gl_pos-1);   /* ^B */
        break;
          case '\004':                  /* ^D */
        if (gl_cnt == 0) {
            gl_buf[0] = 0;
            gl_cleanup();
            gl_putc('\n');
            gl_result = GL_EOF;
            return gl_buf;
        } else {
            gl_del(0, 1);
        }
        break;
          case '\005': gl_fixup(gl_prompt, -1, gl_cnt); /* ^E */
        break;
          case '\006': gl_fixup(gl_prompt, -1, gl_pos+1);   /* ^F */
        break;
          case '\010': case '\177': gl_del(-1, 0);  /* ^H and DEL */
        break;
          case '\t':                        /* TAB */
            if (gl_completion_proc) {
            tmp = gl_pos;
            gl_buf[sizeof(gl_buf) - 1] = '\0';
                loc = gl_do_tab_completion(gl_buf, &tmp, sizeof(gl_buf), (lastch == '\t'));
            gl_buf[sizeof(gl_buf) - 1] = '\0';
                if (loc >= 0 || tmp != gl_pos)
                    gl_fixup(gl_prompt, /* loc */ -2, tmp);
            if (lastch == '\t') {
                c = 0;
                lastch = 0;
            }
        } else if (gl_tab_hook) {
            tmp = gl_pos;
            gl_buf[sizeof(gl_buf) - 1] = '\0';
                loc = gl_tab_hook(gl_buf, (int) gl_strlen(gl_prompt), &tmp, sizeof(gl_buf));
            gl_buf[sizeof(gl_buf) - 1] = '\0';
                if (loc >= 0 || tmp != gl_pos)
                    gl_fixup(gl_prompt, loc, tmp);
                }
        break;
          case '\013': gl_kill(gl_pos);         /* ^K */
        break;
          case '\014': gl_redraw();             /* ^L */
        break;
          case '\016':                  /* ^N */
        strcpy(gl_buf, hist_next());
                if (gl_in_hook)
                gl_in_hook(gl_buf);
        gl_fixup(gl_prompt, 0, GL_BUF_SIZE);
        break;
          case '\017': gl_overwrite = !gl_overwrite;        /* ^O */
        break;
          case '\020':                  /* ^P */
        strcpy(gl_buf, hist_prev());
                if (gl_in_hook)
                gl_in_hook(gl_buf);
        gl_fixup(gl_prompt, 0, GL_BUF_SIZE);
        break;
          case '\022': search_back(1);          /* ^R */
        break;
          case '\023': search_forw(1);          /* ^S */
        break;
          case '\024': gl_transpose();          /* ^T */
        break;
              case '\025': gl_kill(0);              /* ^U */
        break;
              case '\027': gl_killword(-1);         /* ^W */
        break;
          case '\031': gl_yank();               /* ^Y */
        break;
          case '\033':              /* ansi arrow keys */
        c = gl_getcx(3);
        if ((c == '[') || (c == 'O')) {
ansi:
            switch(c = gl_getc()) {
              case 'A':                         /* up */
                strcpy(gl_buf, hist_prev());
                        if (gl_in_hook)
                        gl_in_hook(gl_buf);
                gl_fixup(gl_prompt, 0, GL_BUF_SIZE);
                break;
              case 'B':                             /* down */
                strcpy(gl_buf, hist_next());
                        if (gl_in_hook)
                        gl_in_hook(gl_buf);
                gl_fixup(gl_prompt, 0, GL_BUF_SIZE);
                break;
              case 'C':
                gl_fixup(gl_prompt, -1, gl_pos+1); /* right */
                break;
              case 'D':
                gl_fixup(gl_prompt, -1, gl_pos-1); /* left */
                break;
              case '0':
              case '1':
                goto ansi;
              default: gl_beep();         /* who knows */
                break;
            }
        } else if ((gl_vi_preferred == 0) && ((c == 'f') || (c == 'F'))) {
            gl_word(1);
        } else if ((gl_vi_preferred == 0) && ((c == 'b') || (c == 'B'))) {
            gl_word(-1);
        } else if (c != (-1)) {
            /* enter vi command mode */
#if defined(__windows__) || defined(MSDOS)
            if (gl_vi_preferred == 0) {
                /* On Windows, ESC acts like a line kill,
                 * so don't use vi mode unless they prefer
                 * vi mode.
                 */
                        gl_kill(0);
            } else
#endif
            if (gl_vi_mode == 0) {
                gl_vi_mode = 1;
                vi_count = 1;
                vi_delete = 0;
                memset(vi_countbuf, 0, sizeof(vi_countbuf));
                if (gl_pos > 0)
                    gl_fixup(gl_prompt, -2, gl_pos-1);  /* left 1 char */
                /* Don't bother if the line is empty and we don't
                 * know for sure if the user wants vi mode.
                 */
                if ((gl_cnt > 0) || (gl_vi_preferred == 1)) {
                    /* We still have to use the char read! */
                    goto vi;
                }
                gl_vi_mode = 0;
            } else {
                gl_beep();
            }
        }
        break;
          default:      /* check for a terminal signal */
            if (c > 0) {    /* ignore 0 (reset above) */
                if (c == gl_intrc) {
            gl_result = GL_INTERRUPT;
            gl_buf[0] = 0;
                    gl_cleanup();
#ifdef SIGINT
                    raise(SIGINT);
                    gl_init();
                    gl_redraw();
#endif
            return gl_buf;
            }
 
                if (c == gl_quitc) {
            gl_result = GL_INTERRUPT;
            gl_buf[0] = 0;
                    gl_cleanup();
#ifdef SIGQUIT
                    raise(SIGQUIT);
                    gl_init();
                    gl_redraw();
#endif
            return gl_buf;
            }
 
#ifdef __unix__
                if (c == gl_suspc || c == gl_dsuspc) {
#ifdef SIGTSTP
            gl_result = GL_INTERRUPT;
            gl_buf[0] = 0;
            gl_cleanup();
                    sig = SIGTSTP;
                    kill(0, sig);
                    gl_init();
                    gl_redraw();
            return gl_buf;
#endif
            }
#endif /* __unix__ */
        }
                if (c > 0)
            gl_beep();
        break;
        }
    }
    if (c > 0)
        lastch = c;
    }
    gl_buf[0] = 0;
    gl_cleanup();
    return gl_buf;
}
 
static void
gl_addchar(int c)
 
/* adds the character c to the input buffer at current location */
{
    int  i;
 
    if (gl_cnt >= GL_BUF_SIZE - 1)
    gl_error("\n*** Error: getline(): input buffer overflow\n");
    if (gl_overwrite == 0 || gl_pos == gl_cnt) {
        for (i=gl_cnt; i >= gl_pos; i--)
            gl_buf[i+1] = gl_buf[i];
        gl_buf[gl_pos] = (char) c;
        gl_fixup(gl_prompt, gl_pos, gl_pos+1);
    } else {
    gl_buf[gl_pos] = (char) c;
    gl_extent = 1;
        gl_fixup(gl_prompt, gl_pos, gl_pos+1);
    }
}
 
static void
gl_yank(void)
/* adds the kill buffer to the input buffer at current location */
{
    int  i, len;
 
    len = (int) strlen(gl_killbuf);
    if (len > 0) {
    if (gl_overwrite == 0) {
            if (gl_cnt + len >= GL_BUF_SIZE - 1)
            gl_error("\n*** Error: getline(): input buffer overflow\n");
            for (i=gl_cnt; i >= gl_pos; i--)
                gl_buf[i+len] = gl_buf[i];
        for (i=0; i < len; i++)
                gl_buf[gl_pos+i] = gl_killbuf[i];
            gl_fixup(gl_prompt, gl_pos, gl_pos+len);
    } else {
        if (gl_pos + len > gl_cnt) {
                if (gl_pos + len >= GL_BUF_SIZE - 1)
                gl_error("\n*** Error: getline(): input buffer overflow\n");
        gl_buf[gl_pos + len] = 0;
            }
        for (i=0; i < len; i++)
                gl_buf[gl_pos+i] = gl_killbuf[i];
        gl_extent = len;
            gl_fixup(gl_prompt, gl_pos, gl_pos+len);
    }
    } else
    gl_beep();
}
 
static void
gl_transpose(void)
/* switch character under cursor and to left of cursor */
{
    int    c;
 
    if (gl_pos > 0 && gl_cnt > gl_pos) {
    c = gl_buf[gl_pos-1];
    gl_buf[gl_pos-1] = gl_buf[gl_pos];
    gl_buf[gl_pos] = (char) c;
    gl_extent = 2;
    gl_fixup(gl_prompt, gl_pos-1, gl_pos);
    } else
    gl_beep();
}
 
static void
gl_newline(void)
/*
 * Cleans up entire line before returning to caller. A \n is appended.
 * If line longer than screen, we redraw starting at beginning
 */
{
    int change = gl_cnt;
    int len = gl_cnt;
    int loc = gl_width - 5; /* shifts line back to start position */
 
    if (gl_cnt >= GL_BUF_SIZE - 1)
        gl_error("\n*** Error: getline(): input buffer overflow\n");
    if (gl_out_hook) {
    change = gl_out_hook(gl_buf);
        len = (int) strlen(gl_buf);
    }
    if (loc > len)
    loc = len;
    gl_fixup(gl_prompt, change, loc);   /* must do this before appending \n */
    gl_buf[len] = '\n';
    gl_buf[len+1] = '\0';
    gl_putc('\n');
}
 
static void
gl_del(int loc, int killsave)
 
/*
 * Delete a character.  The loc variable can be:
 *    -1 : delete character to left of cursor
 *     0 : delete character under cursor
 */
{
    int i, j;
 
    if ((loc == -1 && gl_pos > 0) || (loc == 0 && gl_pos < gl_cnt)) {
        for (j=0, i=gl_pos+loc; i < gl_cnt; i++) {
        if ((j == 0) && (killsave != 0) && (gl_vi_mode != 0)) {
            gl_killbuf[0] = gl_buf[i];
            gl_killbuf[1] = '\0';
        j = 1;
        }
        gl_buf[i] = gl_buf[i+1];
    }
    gl_fixup(gl_prompt, gl_pos+loc, gl_pos+loc);
    } else
    gl_beep();
}
 
static void
gl_kill(int pos)
 
/* delete from pos to the end of line */
{
    if (pos < gl_cnt) {
    strcpy(gl_killbuf, gl_buf + pos);
    gl_buf[pos] = '\0';
    gl_fixup(gl_prompt, pos, pos);
    } else
    gl_beep();
}
 
static void
gl_killword(int direction)
{
    int pos = gl_pos;
    int startpos = gl_pos;
    int tmp;
    int i;
 
    if (direction > 0) {        /* forward */
        while (!isspace(gl_buf[pos]) && pos < gl_cnt)
        pos++;
    while (isspace(gl_buf[pos]) && pos < gl_cnt)
        pos++;
    } else {                /* backward */
    if (pos > 0)
        pos--;
    while (isspace(gl_buf[pos]) && pos > 0)
        pos--;
        while (!isspace(gl_buf[pos]) && pos > 0)
        pos--;
    if (pos < gl_cnt && isspace(gl_buf[pos]))   /* move onto word */
        pos++;
    }
    if (pos < startpos) {
        tmp = pos;
    pos = startpos;
    startpos = tmp;
    }
    memcpy(gl_killbuf, gl_buf + startpos, (size_t) (pos - startpos));
    gl_killbuf[pos - startpos] = '\0';
    if (isspace(gl_killbuf[pos - startpos - 1]))
        gl_killbuf[pos - startpos - 1] = '\0';
    gl_fixup(gl_prompt, -1, startpos);
    for (i=0, tmp=pos - startpos; i<tmp; i++)
        gl_del(0, 0);
}   /* gl_killword */
 
static void
gl_word(int direction)
 
/* move forward or backword one word */
{
    int pos = gl_pos;
 
    if (direction > 0) {        /* forward */
        while (!isspace(gl_buf[pos]) && pos < gl_cnt)
        pos++;
    while (isspace(gl_buf[pos]) && pos < gl_cnt)
        pos++;
    } else {                /* backword */
    if (pos > 0)
        pos--;
    while (isspace(gl_buf[pos]) && pos > 0)
        pos--;
        while (!isspace(gl_buf[pos]) && pos > 0)
        pos--;
    if (pos < gl_cnt && isspace(gl_buf[pos]))   /* move onto word */
        pos++;
    }
    gl_fixup(gl_prompt, -1, pos);
}
 
static void
gl_redraw(void)
/* emit a newline, reset and redraw prompt and current input line */
{
    if (gl_init_done > 0) {
        gl_putc('\n');
        gl_fixup(gl_prompt, -2, gl_pos);
    }
}
 
static void
gl_fixup(const char *prompt, int change, int cursor)
 
 
/*
 * This function is used both for redrawing when input changes or for
 * moving within the input line.  The parameters are:
 *   prompt:  compared to last_prompt[] for changes;
 *   change : the index of the start of changes in the input buffer,
 *            with -1 indicating no changes, -2 indicating we're on
 *            a new line, redraw everything.
 *   cursor : the desired location of the cursor after the call.
 *            A value of GL_BUF_SIZE can be used  to indicate the cursor should
 *            move just past the end of the input line.
 */
{
    static int   gl_shift;  /* index of first on screen character */
    static int   off_right; /* true if more text right of screen */
    static int   off_left;  /* true if more text left of screen */
    static char  last_prompt[80] = "";
    int          left = 0, right = -1;      /* bounds for redraw */
    int          pad;       /* how much to erase at end of line */
    int          backup;        /* how far to backup before fixing */
    int          new_shift;     /* value of shift based on cursor */
    int          extra;         /* adjusts when shift (scroll) happens */
    int          i;
    int          new_right = -1; /* alternate right bound, using gl_extent */
    int          l1, l2;
 
    if (change == -2) {   /* reset */
    gl_pos = gl_cnt = gl_shift = off_right = off_left = 0;
    gl_putc('\r');
    gl_puts(prompt);
    strcpy(last_prompt, prompt);
    change = 0;
        gl_width = gl_termw - (int) gl_strlen(prompt);
    } else if (strcmp(prompt, last_prompt) != 0) {
    l1 = (int) gl_strlen(last_prompt);
    l2 = (int) gl_strlen(prompt);
    gl_cnt = gl_cnt + l1 - l2;
    strcpy(last_prompt, prompt);
    gl_putc('\r');
    gl_puts(prompt);
    gl_pos = gl_shift;
        gl_width = gl_termw - l2;
    change = 0;
    }
    pad = (off_right)? gl_width - 1 : gl_cnt - gl_shift;   /* old length */
    backup = gl_pos - gl_shift;
    if (change >= 0) {
        gl_cnt = (int) strlen(gl_buf);
        if (change > gl_cnt)
        change = gl_cnt;
    }
    if (cursor > gl_cnt) {
    if (cursor != GL_BUF_SIZE) {        /* GL_BUF_SIZE means end of line */
        if (gl_ellipses_during_completion == 0) {
            gl_beep();
        }
    }
    cursor = gl_cnt;
    }
    if (cursor < 0) {
    gl_beep();
    cursor = 0;
    }
    if (off_right || (off_left && cursor < gl_shift + gl_width - gl_scroll / 2))
    extra = 2;          /* shift the scrolling boundary */
    else
    extra = 0;
    new_shift = cursor + extra + gl_scroll - gl_width;
    if (new_shift > 0) {
    new_shift /= gl_scroll;
    new_shift *= gl_scroll;
    } else
    new_shift = 0;
    if (new_shift != gl_shift) {    /* scroll occurs */
    gl_shift = new_shift;
    off_left = (gl_shift)? 1 : 0;
    off_right = (gl_cnt > gl_shift + gl_width - 1)? 1 : 0;
        left = gl_shift;
    new_right = right = (off_right)? gl_shift + gl_width - 2 : gl_cnt;
    } else if (change >= 0) {       /* no scroll, but text changed */
    if (change < gl_shift + off_left) {
        left = gl_shift;
    } else {
        left = change;
        backup = gl_pos - change;
    }
    off_right = (gl_cnt > gl_shift + gl_width - 1)? 1 : 0;
    right = (off_right)? gl_shift + gl_width - 2 : gl_cnt;
    new_right = (gl_extent && (right > left + gl_extent))?
                 left + gl_extent : right;
    }
    pad -= (off_right)? gl_width - 1 : gl_cnt - gl_shift;
    pad = (pad < 0)? 0 : pad;
    if (left <= right) {        /* clean up screen */
    for (i=0; i < backup; i++)
        gl_putc('\b');
    if (left == gl_shift && off_left) {
        gl_putc('$');
        left++;
        }
    for (i=left; i < new_right; i++)
        gl_putc(gl_buf[i]);
    gl_pos = new_right;
    if (off_right && new_right == right) {
        gl_putc('$');
        gl_pos++;
    } else {
        for (i=0; i < pad; i++) /* erase remains of prev line */
        gl_putc(' ');
        gl_pos += pad;
    }
    }
    i = gl_pos - cursor;        /* move to final cursor location */
    if (i > 0) {
    while (i--)
       gl_putc('\b');
    } else {
    for (i=gl_pos; i < cursor; i++)
        gl_putc(gl_buf[i]);
    }
    gl_pos = cursor;
}
 
static int
gl_tab(char *buf, int offset, int *loc, size_t bufsize)
/* default tab handler, acts like tabstops every 8 cols */
{
    int i, count, len;
 
    len = (int) strlen(buf);
    count = 8 - (offset + *loc) % 8;
    for (i=len; i >= *loc; i--)
        if (i+count < (int) bufsize)
        buf[i+count] = buf[i];
    for (i=0; i < count; i++)
        if (*loc+i < (int) bufsize)
        buf[*loc+i] = ' ';
    i = *loc;
    *loc = i + count;
    return i;
}
 
/******************* History stuff **************************************/
 
#ifndef HIST_SIZE
#define HIST_SIZE 100
#endif
 
static int      hist_pos = 0, hist_last = 0;
static char    *hist_buf[HIST_SIZE];
static char     hist_empty_elem[2] = "";
 
static void
hist_init(void)
{
    int i;
 
    hist_buf[0] = hist_empty_elem;
    for (i=1; i < HIST_SIZE; i++)
    hist_buf[i] = (char *)0;
}
 
void
gl_histadd(char *buf)
{
    static char *prev = 0;
    char *p = buf;
    int len;
 
    /* in case we call gl_histadd() before we call getline() */
    if (gl_init_done < 0) {     /* -1 only on startup */
        hist_init();
        gl_init_done = 0;
    }
    while (*p == ' ' || *p == '\t' || *p == '\n')
    p++;
    if (*p) {
    len = (int) strlen(buf);
    if (strchr(p, '\n'))    /* previously line already has NL stripped */
        len--;
    if ((prev == 0) || ((int) strlen(prev) != len) ||
                strncmp(prev, buf, (size_t) len) != 0) {
            hist_buf[hist_last] = hist_save(buf);
        prev = hist_buf[hist_last];
            hist_last = (hist_last + 1) % HIST_SIZE;
            if (hist_buf[hist_last] && *hist_buf[hist_last]) {
            free(hist_buf[hist_last]);
            }
        hist_buf[hist_last] = hist_empty_elem;
    }
    }
    hist_pos = hist_last;
}
 
static char *
hist_prev(void)
/* loads previous hist entry into input buffer, sticks on first */
{
    char *p = 0;
    int   next = (hist_pos - 1 + HIST_SIZE) % HIST_SIZE;
 
    if (hist_buf[hist_pos] != 0 && next != hist_last) {
        hist_pos = next;
        p = hist_buf[hist_pos];
    }
    if (p == 0) {
    p = hist_empty_elem;
    gl_beep();
    }
    return p;
}
 
static char *
hist_next(void)
/* loads next hist entry into input buffer, clears on last */
{
    char *p = 0;
 
    if (hist_pos != hist_last) {
        hist_pos = (hist_pos+1) % HIST_SIZE;
    p = hist_buf[hist_pos];
    }
    if (p == 0) {
    p = hist_empty_elem;
    gl_beep();
    }
    return p;
}
 
static char *
hist_save(char *p)
 
/* makes a copy of the string */
{
    char *s = 0;
    size_t len = strlen(p);
    char *nl = strpbrk(p, "\n\r");
 
    if (nl) {
        if ((s = (char *) malloc(len)) != 0) {
            strncpy(s, p, len-1);
        s[len-1] = 0;
    }
    } else {
        if ((s = (char *) malloc(len+1)) != 0) {
            strcpy(s, p);
        }
    }
    if (s == 0)
    gl_error("\n*** Error: hist_save() failed on malloc\n");
    return s;
}
 
 
 
 
void
gl_histsavefile(const char *const path)
{
    FILE *fp;
    const char *p;
    int i, j;
 
    fp = fopen(path,
#if defined(__windows__) || defined(MSDOS)
        "wt"
#else
        "w"
#endif
    );
    if (fp != NULL) {
        for (i=2; i<HIST_SIZE; i++) {
                j = (hist_pos+i) % HIST_SIZE;
            p = hist_buf[j];
            if ((p == NULL) || (*p == '\0'))
                continue;
            fprintf(fp, "%s\n", p);
        }
        fclose(fp);
    }
}   /* gl_histsavefile */
 
 
 
 
void
gl_histloadfile(const char *const path)
{
    FILE *fp;
    char line[256];
 
    fp = fopen(path,
#if defined(__windows__) || defined(MSDOS)
        "rt"
#else
        "r"
#endif
    );
    if (fp != NULL) {
        memset(line, 0, sizeof(line));
        while (fgets(line, sizeof(line) - 2, fp) != NULL) {
            gl_histadd(line);
        }
        fclose(fp);
    }
}   /* gl_histloadfile */
 
 
 
 
/******************* Search stuff **************************************/
 
static char  search_prompt[101];  /* prompt includes search string */
static char  search_string[100];
static int   search_pos = 0;      /* current location in search_string */
static int   search_forw_flg = 0; /* search direction flag */
static int   search_last = 0;     /* last match found */
 
static void
search_update(int c)
{
    if (c == 0) {
    search_pos = 0;
        search_string[0] = 0;
        search_prompt[0] = '?';
        search_prompt[1] = ' ';
        search_prompt[2] = 0;
    } else if (c > 0) {
        search_string[search_pos] = (char) c;
        search_string[search_pos+1] = (char) 0;
        search_prompt[search_pos] = (char) c;
        search_prompt[search_pos+1] = (char) '?';
        search_prompt[search_pos+2] = (char) ' ';
        search_prompt[search_pos+3] = (char) 0;
    search_pos++;
    } else {
    if (search_pos > 0) {
        search_pos--;
            search_string[search_pos] = (char) 0;
            search_prompt[search_pos] = (char) '?';
            search_prompt[search_pos+1] = (char) ' ';
            search_prompt[search_pos+2] = (char) 0;
    } else {
        gl_beep();
        hist_pos = hist_last;
    }
    }
}
 
static void
search_addchar(int c)
{
    char *loc;
 
    search_update(c);
    if (c < 0) {
    if (search_pos > 0) {
        hist_pos = search_last;
    } else {
        gl_buf[0] = 0;
        hist_pos = hist_last;
    }
    strcpy(gl_buf, hist_buf[hist_pos]);
    }
    if ((loc = strstr(gl_buf, search_string)) != 0) {
    gl_fixup(search_prompt, 0, (int) (loc - gl_buf));
    } else if (search_pos > 0) {
        if (search_forw_flg) {
        search_forw(0);
        } else {
        search_back(0);
        }
    } else {
    gl_fixup(search_prompt, 0, 0);
    }
}
 
static void
search_term(void)
{
    gl_search_mode = 0;
    if (gl_buf[0] == 0)     /* not found, reset hist list */
        hist_pos = hist_last;
    if (gl_in_hook)
    gl_in_hook(gl_buf);
    gl_fixup(gl_prompt, 0, gl_pos);
}
 
static void
search_back(int new_search)
{
    int    found = 0;
    char  *p, *loc;
 
    search_forw_flg = 0;
    if (gl_search_mode == 0) {
    search_last = hist_pos = hist_last;
    search_update(0);
    gl_search_mode = 1;
        gl_buf[0] = 0;
    gl_fixup(search_prompt, 0, 0);
    } else if (search_pos > 0) {
    while (!found) {
        p = hist_prev();
        if (*p == 0) {      /* not found, done looking */
           gl_buf[0] = 0;
           gl_fixup(search_prompt, 0, 0);
           found = 1;
        } else if ((loc = strstr(p, search_string)) != 0) {
           strcpy(gl_buf, p);
           gl_fixup(search_prompt, 0, (int) (loc - p));
           if (new_search)
           search_last = hist_pos;
           found = 1;
        }
    }
 
    } else {
        gl_beep();
    }
}
 
static void
search_forw(int new_search)
{
    int    found = 0;
    char  *p, *loc;
 
    search_forw_flg = 1;
    if (gl_search_mode == 0) {
    search_last = hist_pos = hist_last;
    search_update(0);
    gl_search_mode = 1;
        gl_buf[0] = 0;
    gl_fixup(search_prompt, 0, 0);
    } else if (search_pos > 0) {
    while (!found) {
        p = hist_next();
        if (*p == 0) {      /* not found, done looking */
           gl_buf[0] = 0;
           gl_fixup(search_prompt, 0, 0);
           found = 1;
        } else if ((loc = strstr(p, search_string)) != 0) {
           strcpy(gl_buf, p);
           gl_fixup(search_prompt, 0, (int) (loc - p));
           if (new_search)
           search_last = hist_pos;
           found = 1;
        }
    }
    } else {
        gl_beep();
    }
}
 
 
static void
gl_beep(void)
{
#ifdef __windows__
    MessageBeep(MB_OK);
#else
    gl_putc('\007');
#endif
}   /* gl_beep */
 
 
 
static int
gl_display_matches_sort_proc(const void *a, const void *b)
{
    return (strcasecmp(
        * ((const char **) a),
        * ((const char **) b)
    ));
}   /* gl_display_matches_sort_proc */
 
 
 
static void
gl_display_matches(int nused)
{
    char buf[256];
    char buf2[256];
    size_t ilen, imaxlen;
    int i, j, k, l;
    int glen, allmatch;
    int nmax, ncol, colw, nrow;
    char *cp1, *cp2, *lim, *itemp;
 
    gl_putc('\n');
    if (nused == 0) {
        gl_beep();
        gl_puts("    (no matches)");
        gl_putc('\n');
    } else {
        qsort(gl_matchlist, (size_t) nused, sizeof(char *), gl_display_matches_sort_proc);
 
        /* Find the greatest amount that matches. */
        for (glen = 0; ; glen++) {
            allmatch = 1;
            for (i=1; i<nused; i++) {
                if (gl_matchlist[0][glen] != gl_matchlist[i][glen]) {
                    allmatch = 0;
                    break;
                }
            }
            if (allmatch == 0)
                break;
        }
 
        while (glen > 0) {
            if (!isalnum(gl_matchlist[0][glen - 1]))
                break;
            --glen;
        }
 
        nmax = nused;
        imaxlen = strlen(gl_matchlist[0]);
        for (i=1; i<nused; i++) {
            ilen = strlen(gl_matchlist[i]);
            if (ilen > imaxlen)
                imaxlen = ilen;
        }
 
        /* Subtract amount we'll skip for each item. */
        imaxlen -= glen;
 
        ncol = (gl_termw - 8) / ((int) imaxlen + 2);
        if (ncol < 1)
            ncol = 1;
 
        colw = (gl_termw - 8) / ncol;
        nrow = nmax / ncol;
        if ((nused % ncol) != 0)
            nrow++;
 
        if (nrow > (gl_termh - 4)) {
            nrow = gl_termh - 4;
            nmax = ncol * nrow;
        }
 
        for (i=0; i<(int) sizeof(buf2); i++)
            buf2[i] = ' ';
 
        for (j=0; j<nrow; j++) {
            (void) memcpy(buf, buf2, sizeof(buf));
            for (i=0, k=j, l=4; i<ncol; i++, k += nrow, l += colw) {
                if (k >= nmax)
                    continue;
                itemp = gl_matchlist[k] + glen;
                cp1 = buf + l;
                lim = cp1 + (int) strlen(itemp);
                if (lim > (buf + sizeof(buf) - 1))
                    continue;
                cp2 = itemp;
                while (cp1 < lim)
                    *cp1++ = *cp2++;
            }
            for (cp1 = buf + sizeof(buf); *--cp1 == ' '; )
                ;
            ++cp1;
            *cp1 = '\0';
            gl_puts(buf);
            gl_putc('\n');
        }
 
        if (nused > nmax) {
            (void) sprintf(buf, "    ... %d others omitted ...", (nused - nmax));
            gl_puts(buf);
            gl_putc('\n');
        }
    }
    gl_fixup(gl_prompt, -2, GL_BUF_SIZE);
}   /* gl_display_matches */
 
 
 
 
static int
gl_do_tab_completion(char *buf, int *loc, size_t bufsize, int tabtab)
{
    char *startp;
    size_t startoff, amt;
    int c;
    int qmode;
    char *qstart;
    char *lastspacestart;
    char *cp;
    int ntoalloc, nused, nprocused, nalloced, i;
    char **newgl_matchlist;
    char *strtoadd, *strtoadd1;
    int addquotes;
    size_t llen, mlen, glen;
    int allmatch;
    char *curposp;
    size_t lenaftercursor;
    char *matchpfx;
    int wasateol;
    char ellipsessave[4];
 
    /* Zero out the rest of the buffer, so we can move stuff around
     * and know we'll still be NUL-terminated.
     */
    llen = strlen(buf);
    memset(buf + llen, 0, bufsize - llen);
    bufsize -= 4;   /* leave room for a NUL, space, and two quotes. */
    curposp = buf + *loc;
    wasateol = (*curposp == '\0');
    lenaftercursor = llen - (curposp - buf);
    if (gl_ellipses_during_completion != 0) {
        memcpy(ellipsessave, curposp, (size_t) 4);
        memcpy(curposp, "... ", (size_t) 4);
        gl_fixup(gl_prompt, gl_pos, gl_pos + 3);
        memcpy(curposp, ellipsessave, (size_t) 4);
    }
 
    qmode = 0;
    qstart = NULL;
    lastspacestart = NULL;
    matchpfx = NULL;
 
    cp = buf;
    while (cp < curposp) {
        c = (int) *cp++;
        if (c == '\0')
            break;
        if ((c == '"') || (c == '\'')) {
            if (qmode == c) {
                /* closing quote; end it. */
                qstart = NULL;
                qmode = 0;
            } else if (qmode != 0) {
                /* just treat it as a regular char. */
            } else {
                /* start new quote group. */
                qmode = c;
                qstart = cp - 1;
            }
        } else if ((isspace(c)) && (qmode == 0)) {
            /* found a non-quoted space. */
            lastspacestart = cp - 1;
        } else {
            /* regular char */
        }
    }
 
    if (qstart != NULL)
        startp = qstart + 1;
    else if (lastspacestart != NULL)
        startp = lastspacestart + 1;
    else
        startp = buf;
 
    cp = startp;
    mlen = (curposp - cp);
 
    matchpfx = (char *) malloc(mlen + 1);
    memcpy(matchpfx, cp, mlen);
    matchpfx[mlen] = '\0';
 
#define GL_COMPLETE_VECTOR_BLOCK_SIZE 64
 
    nused = 0;
    ntoalloc = GL_COMPLETE_VECTOR_BLOCK_SIZE;
    newgl_matchlist = (char **) malloc((size_t) (sizeof(char *) * (ntoalloc + 1)));
    if (newgl_matchlist == NULL) {
        free(matchpfx);
        gl_beep();
        return 0;
    }
    gl_matchlist = newgl_matchlist;
    nalloced = ntoalloc;
    for (i=nused; i<=nalloced; i++)
        gl_matchlist[i] = NULL;
 
    gl_completion_exact_match_extra_char = ' ';
    for (nprocused = 0;; nprocused++) {
        if (nused == nalloced) {
            ntoalloc += GL_COMPLETE_VECTOR_BLOCK_SIZE;
            newgl_matchlist = (char **) realloc((char *) gl_matchlist, (size_t) (sizeof(char *) * (ntoalloc + 1)));
            if (newgl_matchlist == NULL) {
                /* not enough memory to expand list -- abort */
                for (i=0; i<nused; i++)
                    free(gl_matchlist[i]);
                free(gl_matchlist);
                gl_matchlist = NULL;
                gl_beep();
                free(matchpfx);
                return 0;
            }
            gl_matchlist = newgl_matchlist;
            nalloced = ntoalloc;
            for (i=nused; i<=nalloced; i++)
                gl_matchlist[i] = NULL;
        }
            cp = gl_completion_proc(matchpfx, nprocused);
        if (cp == NULL)
            break;
        if ((cp[0] == '.') && ((cp[1] == '\0') || ((cp[1] == '.') && (cp[2] == '\0'))))
            continue;   /* Skip . and .. */
        gl_matchlist[nused++] = cp;
    }
 
    if (gl_ellipses_during_completion != 0) {
        gl_fixup(gl_prompt, gl_pos, gl_pos);
        gl_puts("    ");
    }
 
    /* We now have an array strings, whose last element is NULL. */
    strtoadd = NULL;
    strtoadd1 = NULL;
    amt = 0;
 
    addquotes = (gl_filename_quoting_desired > 0) || ((gl_filename_quoting_desired < 0) && (gl_completion_proc == gl_local_filename_completion_proc));
 
    if (nused == 1) {
        /* Exactly one match. */
        strtoadd = gl_matchlist[0];
    } else if (tabtab != 0) {
        /* TAB-TAB: print all matches */
        gl_display_matches(nused);
    } else if ((nused > 1) && (mlen > 0)) {
        /* Find the greatest amount that matches. */
        for (glen = strlen(matchpfx); ; glen++) {
            allmatch = 1;
            for (i=1; i<nused; i++) {
                if (gl_matchlist[0][glen] != gl_matchlist[i][glen]) {
                    allmatch = 0;
                    break;
                }
            }
            if (allmatch == 0)
                break;
        }
        strtoadd1 = (char *) malloc(glen + 1);
        if (strtoadd1 != NULL) {
            memcpy(strtoadd1, gl_matchlist[0], glen);
            strtoadd1[glen] = '\0';
            strtoadd = strtoadd1;
        }
    }
 
    if (strtoadd != NULL) {
        if ((qmode == 0) && (addquotes != 0)) {
            if (strpbrk(strtoadd, gl_filename_quote_characters) != NULL) {
                qmode = (strchr(strtoadd, '"') == NULL) ? '"' : '\'';
                memmove(curposp + 1, curposp, lenaftercursor + 1 /* NUL */);
                curposp++;
                *startp++ = (char) qmode;
            }
        }
        startoff = (size_t) (startp - buf);
        amt = strlen(strtoadd);
        if ((amt + startoff + lenaftercursor) >= bufsize)
            amt = bufsize - (amt + startoff + lenaftercursor);
        memmove(curposp + amt - mlen, curposp, lenaftercursor + 1 /* NUL */);
        curposp += amt - mlen;
        memcpy(startp, strtoadd, amt);
        if (nused == 1) {
            /* Exact match. */
            if (qmode != 0) {
                /* Finish the quoting. */
                memmove(curposp + 1, curposp, lenaftercursor + 1 /* NUL */);
                curposp++;
                buf[amt + startoff] = (char) qmode;
                amt++;
            }
            memmove(curposp + 1, curposp, lenaftercursor + 1 /* NUL */);
            curposp++;
            buf[amt + startoff] = (char) gl_completion_exact_match_extra_char;
            amt++;
        } else if ((!wasateol) && (!isspace(*curposp))) {
            /* Not a full match, but insert a
             * space for better readability.
             */
            memmove(curposp + 1, curposp, lenaftercursor + 1 /* NUL */);
            curposp++;
            buf[amt + startoff] = ' ';
        }
        *loc = (int) (startoff + amt);
 
        if (strtoadd1 != NULL)
            free(strtoadd1);
    }
 
    /* Don't need this any more. */
    for (i=0; i<nused; i++)
        free(gl_matchlist[i]);
    free(gl_matchlist);
    gl_matchlist = NULL;
    free(matchpfx);
 
    return 0;
}   /* gl_do_tab_completion */
 
 
 
 
void
gl_tab_completion(gl_tab_completion_proc proc)
{
    if (proc == NULL)
        proc = gl_local_filename_completion_proc;   /* default proc */
    gl_completion_proc = proc;
}   /* gl_tab_completion */
 
 
 
 
#ifndef _StrFindLocalPathDelim
static char *
_StrRFindLocalPathDelim(const char *src)    /* TODO: optimize */
{
    const char *last;
    int c;
 
    last = NULL;
    for (;;) {
        c = *src++;
        if (c == '\0')
            break;
        if (IsLocalPathDelim(c))
            last = src - 1;
    }
 
    return ((char *) last);
}   /* StrRFindLocalPathDelim */
#endif  /* Windows */
 
 
 
 
void
gl_set_home_dir(const char *homedir)
{
    size_t len;
#ifdef __windows__
    const char *homedrive, *homepath;
    char wdir[64];
#else
    struct passwd *pw;
    char *cp;
#endif
 
    if (gl_home_dir != NULL) {
        free(gl_home_dir);
        gl_home_dir = NULL;
    }
 
    if (homedir == NULL) {
#ifdef __windows__
        homedrive = getenv("HOMEDRIVE");
        homepath = getenv("HOMEPATH");
        if ((homedrive != NULL) && (homepath != NULL)) {
            len = strlen(homedrive) + strlen(homepath) + 1;
            gl_home_dir = (char *) malloc(len);
            if (gl_home_dir != NULL) {
                strcpy(gl_home_dir, homedrive);
                strcat(gl_home_dir, homepath);
                return;
            }
        }
 
        wdir[0] = '\0';
        if (GetWindowsDirectory(wdir, sizeof(wdir) - 1) < 1)
            (void) strncpy(wdir, ".", sizeof(wdir));
        else if (wdir[1] == ':') {
            wdir[2] = '\\';
            wdir[3] = '\0';
        }
        homedir = wdir;
#else
        cp = (char *) getlogin();
        if (cp == NULL) {
            cp = (char *) getenv("LOGNAME");
            if (cp == NULL)
                cp = (char *) getenv("USER");
        }
        pw = NULL;
        if (cp != NULL)
            pw = getpwnam(cp);
        if (pw == NULL)
            pw = getpwuid(getuid());
        if (pw == NULL)
            return; /* hell with it */
        homedir = pw->pw_dir;
#endif
    }
 
    len = strlen(homedir) + /* NUL */ 1;
    gl_home_dir = (char *) malloc(len);
    if (gl_home_dir != NULL) {
        memcpy(gl_home_dir, homedir, len);
    }
}   /* gl_set_home_dir */
 
 
 
 
char *gl_getpass(const char *const prompt, char *const pass, int dsize)
{
#ifdef __unix__
    char *cp;
    int c;
 
    memset(pass, 0, (size_t) sizeof(dsize));
    dsize--;
    gl_init();
 
    /* Display the prompt first. */
    if ((prompt != NULL) && (prompt[0] != '\0'))
        gl_puts(prompt);
 
    cp = pass;
    while ((c = gl_getc()) != (-1)) {
        if ((c == '\r') || (c == '\n'))
            break;
        if ((c == '\010') || (c == '\177')) {
            /* ^H and DEL */
            if (cp > pass) {
                *--cp = '\0';
                gl_putc('\010');
                gl_putc(' ');
                gl_putc('\010');
            }
        } else if (cp < (pass + dsize)) {
            gl_putc('*');
            *cp++ = c;
        }
    }
    *cp = '\0';
    gl_putc('\n');
    gl_cleanup();
    return (pass);
#else
#ifdef __windows__
    char *cp;
    int c;
 
    FlushConsoleInputBuffer(GetStdHandle(STD_INPUT_HANDLE));
    ZeroMemory(pass, (DWORD) sizeof(dsize));
    dsize--;
 
    if ((prompt != NULL) && (prompt[0] != '\0'))
        _cputs(prompt);
 
    for (cp = pass;;) {
        c = (int) _getch();
        if ((c == '\r') || (c == '\n'))
            break;
        if ((c == '\010') || (c == '\177')) {
            /* ^H and DEL */
            if (cp > pass) {
                *--cp = '\0';
                _putch('\010');
                _putch(' ');
                _putch('\010');
            }
        } else if (cp < (pass + dsize)) {
            _putch('*');
            *cp++ = c;
        }
    }
    _putch('\r');
    _putch('\n');
    Sleep(40);
    FlushConsoleInputBuffer(GetStdHandle(STD_INPUT_HANDLE));
 
    *cp = '\0';
    return (pass);
#endif  /* __windows__ */
#endif  /* ! __unix__ */
}   /* gl_getpass */
 
 
 
 
#ifdef __unix__
 
char *
gl_local_filename_completion_proc(const char *start, int idx)
{
    static DIR *dir = NULL;
    static int filepfxoffset;
    static size_t filepfxlen;
 
    const char *filepfx;
    struct dirent *dent;
    char *cp;
    const char *dirtoopen, *name;
    char *dirtoopen1;
    size_t len, len2;
    struct stat st;
 
    if (idx == 0) {
        if (dir != NULL) {
            /* shouldn't get here! */
            closedir(dir);
            dir = NULL;
        }
    }
 
    if (dir == NULL) {
        dirtoopen1 = NULL;
        cp = _StrRFindLocalPathDelim(start);
        if (cp == start) {
            dirtoopen = LOCAL_PATH_DELIM_STR;   /* root dir */
            filepfxoffset = 1;
        } else if (cp == NULL) {
            dirtoopen = ".";
            filepfxoffset = 0;
        } else {
            len = strlen(start) + 1;
            dirtoopen1 = (char *) malloc(len);
            if (dirtoopen1 == NULL)
                return NULL;
            memcpy(dirtoopen1, start, len);
            len = (cp - start);
            dirtoopen1[len] = '\0';
            dirtoopen = dirtoopen1;
            filepfxoffset = (int) ((cp + 1) - start);
        }
 
        if (strcmp(dirtoopen, "~") == 0) {
            if (gl_home_dir == NULL)
                gl_set_home_dir(NULL);
            if (gl_home_dir == NULL)
                return (NULL);
            dirtoopen = gl_home_dir;
        }
 
        dir = opendir(dirtoopen);
        if (dirtoopen1 != NULL)
            free(dirtoopen1);
 
        filepfx = start + filepfxoffset;
        filepfxlen = strlen(filepfx);
    }
 
    if (dir != NULL) {
        /* assumes "start" is same for each iteration. */
        filepfx = start + filepfxoffset;
 
        for (;;) {
            dent = readdir(dir);
            if (dent == NULL) {
                /* no more items */
                closedir(dir);
                dir = NULL;
 
                if (idx == 1) {
                    /* There was exactly one match.
                     * In this special case, we
                     * want to append a / instead
                     * of a space.
                     */
                    cp = gl_matchlist[0];
                    if ((cp[0] == '~') && ((cp[1] == '\0') || (IsLocalPathDelim(cp[1])))) {
                        len = strlen(cp + 1) + /* NUL */ 1;
                        len2 = strlen(gl_home_dir);
                        if (IsLocalPathDelim(gl_home_dir[len2 - 1]))
                            len2--;
                        cp = (char *) realloc(gl_matchlist[0], len + len2);
                        if (cp == NULL) {
                            cp = gl_matchlist[0];
                        } else {
                            memmove(cp + len2, cp + 1, len);
                            memcpy(cp, gl_home_dir, len2);
                            gl_matchlist[0] = cp;
                        }
                    }
                    if ((lstat(cp, &st) == 0) && (S_ISDIR(st.st_mode)))
                        gl_completion_exact_match_extra_char = LOCAL_PATH_DELIM;
                }
                return NULL;
            }
 
            name = dent->d_name;
            if ((name[0] == '.') && ((name[1] == '\0') || ((name[1] == '.') && (name[2] == '\0'))))
                continue;   /* Skip . and .. */
 
            if ((filepfxlen == 0) || (strncmp(name, filepfx, filepfxlen) == 0)) {
                /* match */
                len = strlen(name);
                cp = (char *) malloc(filepfxoffset + len + 1 /* spare */ + 1 /* NUL */);
                *cp = '\0';
                if (filepfxoffset > 0)
                    memcpy(cp, start, (size_t) filepfxoffset);
                memcpy(cp + filepfxoffset, name, len + 1);
                return (cp);
            }
        }
    }
 
    return NULL;
}   /* gl_local_filename_completion_proc */
 
#endif  /* __unix__ */
 
 
 
 
 
#ifdef __windows__
 
char *
gl_local_filename_completion_proc(const char *start, int idx)
{
    static HANDLE searchHandle = NULL;
    static int filepfxoffset;
    static size_t filepfxlen;
 
    WIN32_FIND_DATA ffd;
    DWORD dwErr;
    char *cp, *c2, ch;
    const char *filepfx;
    const char *dirtoopen, *name;
    char *dirtoopen1, *dirtoopen2;
    size_t len, len2;
 
    if (idx == 0) {
        if (searchHandle != NULL) {
            /* shouldn't get here! */
            FindClose(searchHandle);
            searchHandle = NULL;
        }
    }
 
 
    if (searchHandle == NULL) {
        dirtoopen1 = NULL;
        dirtoopen2 = NULL;
        cp = _StrRFindLocalPathDelim(start);
        if (cp == start) {
            dirtoopen = LOCAL_PATH_DELIM_STR;   /* root dir */
            filepfxoffset = 1;
        } else if (cp == NULL) {
            dirtoopen = ".";
            filepfxoffset = 0;
        } else {
            len = strlen(start) + 1;
            dirtoopen1 = (char *) malloc(len);
            if (dirtoopen1 == NULL)
                return NULL;
            memcpy(dirtoopen1, start, len);
            len = (cp - start);
            dirtoopen1[len] = '\0';
            dirtoopen = dirtoopen1;
            filepfxoffset = (int) ((cp + 1) - start);
        }
 
        if (strcmp(dirtoopen, "~") == 0) {
            if (gl_home_dir == NULL)
                gl_set_home_dir(NULL);
            if (gl_home_dir == NULL)
                return (NULL);
            dirtoopen = gl_home_dir;
        }
 
        len = strlen(dirtoopen);
        dirtoopen2 = (char *) malloc(len + 8);
        if (dirtoopen2 == NULL) {
            if (dirtoopen1 != NULL)
                free(dirtoopen1);
            return NULL;
        }
 
        memcpy(dirtoopen2, dirtoopen, len + 1);
        if (dirtoopen2[len - 1] == LOCAL_PATH_DELIM)
            memcpy(dirtoopen2 + len, "*.*", (size_t) 4);
        else
            memcpy(dirtoopen2 + len, "\\*.*", (size_t) 5);
 
        /* "Open" the directory. */
        memset(&ffd, 0, sizeof(ffd));
        searchHandle = FindFirstFile(dirtoopen2, &ffd);
 
        free(dirtoopen2);
        if (dirtoopen1 != NULL)
            free(dirtoopen1);
 
        if (searchHandle == INVALID_HANDLE_VALUE) {
            return NULL;
        }
 
        filepfx = start + filepfxoffset;
        filepfxlen = strlen(filepfx);
    } else {
        /* assumes "start" is same for each iteration. */
        filepfx = start + filepfxoffset;
        goto next;
    }
 
    for (;;) {
 
        name = ffd.cFileName;
        if ((name[0] == '.') && ((name[1] == '\0') || ((name[1] == '.') && (name[2] == '\0'))))
            goto next;  /* Skip . and .. */
 
        if ((filepfxlen == 0) || (_strnicmp(name, filepfx, filepfxlen) == 0)) {
            /* match */
            len = strlen(name);
            cp = (char *) malloc(filepfxoffset + len + 4 /* spare */ + 1 /* NUL */);
            *cp = '\0';
            if (filepfxoffset > 0)
                memcpy(cp, start, filepfxoffset);
            memcpy(cp + filepfxoffset, name, len + 1);
            if (ffd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
                /* Embed file type with name. */
                c2 = cp + filepfxoffset + len + 1;
                *c2++ = '\0';
                *c2++ = 'd';
                *c2 = '\0';
            } else {
                c2 = cp + filepfxoffset + len + 1;
                *c2++ = '\0';
                *c2++ = '-';
                *c2 = '\0';
            }
            return (cp);
        }
 
next:
        if (!FindNextFile(searchHandle, &ffd)) {
            dwErr = GetLastError();
            if (dwErr != ERROR_NO_MORE_FILES) {
                FindClose(searchHandle);
                searchHandle = NULL;
                return NULL;
            }
 
            /* no more items */
            FindClose(searchHandle);
            searchHandle = NULL;
 
            if (idx == 1) {
                /* There was exactly one match.
                 * In this special case, we
                 * want to append a \ instead
                 * of a space.
                 */
                cp = gl_matchlist[0];
                ch = (char) cp[strlen(cp) + 2];
                if (ch == (char) 'd')
                    gl_completion_exact_match_extra_char = LOCAL_PATH_DELIM;
 
                if ((cp[0] == '~') && ((cp[1] == '\0') || (IsLocalPathDelim(cp[1])))) {
                    len = strlen(cp + 1) + /* NUL */ 1;
                    len2 = strlen(gl_home_dir);
                    if (IsLocalPathDelim(gl_home_dir[len2 - 1]))
                        len2--;
                    cp = (char *) realloc(gl_matchlist[0], len + len2 + 4);
                    if (cp == NULL) {
                        cp = gl_matchlist[0];
                    } else {
                        memmove(cp + len2, cp + 1, len);
                        memcpy(cp, gl_home_dir, len2);
                        c2 = cp + len + len2;
                        *c2++ = '\0';
                        *c2++ = ch;
                        *c2 = '\0';
                        gl_matchlist[0] = cp;
                    }
                }
            }
            break;
        }
    }
    return (NULL);
}   /* gl_local_filename_completion_proc */
 
#endif  /* __windows__ */