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Sourcecode: firebird1.5 version File versions

readline.c

/*    $NetBSD: readline.c,v 1.46 2004/02/27 14:52:18 christos Exp $     */

/*-
 * Copyright (c) 1997 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jaromir Dolecek.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the NetBSD
 *    Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#if !defined(lint) && !defined(SCCSID)
__RCSID("$NetBSD: readline.c,v 1.46 2004/02/27 14:52:18 christos Exp $");
#endif /* not lint && not SCCSID */

#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <dirent.h>
#include <string.h>
#include <pwd.h>
#include <ctype.h>
#include <stdlib.h>
#include <unistd.h>
#include <limits.h>
#include <errno.h>
#include <fcntl.h>
#ifdef HAVE_VIS_H
#include <vis.h>
#else
#include "np/vis.h"
#endif
#ifdef HAVE_ALLOCA_H
#include <alloca.h>
#endif
#include "el.h"
#include "fcns.h"       /* for EL_NUM_FCNS */
#include "histedit.h"
#include "readline/readline.h"

/* for rl_complete() */
#define TAB       '\r'

/* see comment at the #ifdef for sense of this */
/* #define GDB_411_HACK */

/* readline compatibility stuff - look at readline sources/documentation */
/* to see what these variables mean */
const char *rl_library_version = "EditLine wrapper";
static char empty[] = { '\0' };
static char expand_chars[] = { ' ', '\t', '\n', '=', '(', '\0' };
static char break_chars[] = { ' ', '\t', '\n', '"', '\\', '\'', '`', '@', '$',
    '>', '<', '=', ';', '|', '&', '{', '(', '\0' };
char *rl_readline_name = empty;
FILE *rl_instream = NULL;
FILE *rl_outstream = NULL;
int rl_point = 0;
int rl_end = 0;
char *rl_line_buffer = NULL;
VFunction *rl_linefunc = NULL;
int rl_done = 0;
VFunction *rl_event_hook = NULL;

int history_base = 1;         /* probably never subject to change */
int history_length = 0;
int max_input_history = 0;
char history_expansion_char = '!';
char history_subst_char = '^';
char *history_no_expand_chars = expand_chars;
Function *history_inhibit_expansion_function = NULL;
char *history_arg_extract(int start, int end, const char *str);

int rl_inhibit_completion = 0;
int rl_attempted_completion_over = 0;
char *rl_basic_word_break_characters = break_chars;
char *rl_completer_word_break_characters = NULL;
char *rl_completer_quote_characters = NULL;
Function *rl_completion_entry_function = NULL;
CPPFunction *rl_attempted_completion_function = NULL;
Function *rl_pre_input_hook = NULL;
Function *rl_startup1_hook = NULL;
Function *rl_getc_function = NULL;
char *rl_terminal_name = NULL;
int rl_already_prompted = 0;
int rl_filename_completion_desired = 0;
int rl_ignore_completion_duplicates = 0;
int rl_catch_signals = 1;
VFunction *rl_redisplay_function = NULL;
Function *rl_startup_hook = NULL;
VFunction *rl_completion_display_matches_hook = NULL;
VFunction *rl_prep_term_function = NULL;
VFunction *rl_deprep_term_function = NULL;

/*
 * The current prompt string.
 */
char *rl_prompt = NULL;
/*
 * This is set to character indicating type of completion being done by
 * rl_complete_internal(); this is available for application completion
 * functions.
 */
int rl_completion_type = 0;

/*
 * If more than this number of items results from query for possible
 * completions, we ask user if they are sure to really display the list.
 */
int rl_completion_query_items = 100;

/*
 * List of characters which are word break characters, but should be left
 * in the parsed text when it is passed to the completion function.
 * Shell uses this to help determine what kind of completing to do.
 */
char *rl_special_prefixes = (char *)NULL;

/*
 * This is the character appended to the completed words if at the end of
 * the line. Default is ' ' (a space).
 */
int rl_completion_append_character = ' ';

/* stuff below is used internally by libedit for readline emulation */

/* if not zero, non-unique completions always show list of possible matches */
static int _rl_complete_show_all = 0;

static History *h = NULL;
static EditLine *e = NULL;
static Function *map[256];
static int el_rl_complete_cmdnum = 0;

/* internal functions */
static unsigned char     _el_rl_complete(EditLine *, int);
static unsigned char     _el_rl_tstp(EditLine *, int);
static char       *_get_prompt(EditLine *);
static HIST_ENTRY *_move_history(int);
static int         _history_expand_command(const char *, size_t, size_t,
    char **);
static char       *_rl_compat_sub(const char *, const char *,
    const char *, int);
static int         rl_complete_internal(int);
static int         _rl_qsort_string_compare(const void *, const void *);
static int         _rl_event_read_char(EditLine *, char *);


/* ARGSUSED */
static char *
_get_prompt(EditLine *el __attribute__((__unused__)))
{
      rl_already_prompted = 1;
      return (rl_prompt);
}


/*
 * generic function for moving around history
 */
static HIST_ENTRY *
_move_history(int op)
{
      HistEvent ev;
      static HIST_ENTRY rl_he;

      if (history(h, &ev, op) != 0)
            return (HIST_ENTRY *) NULL;

      rl_he.line = ev.str;
      rl_he.data = NULL;

      return (&rl_he);
}


/*
 * READLINE compatibility stuff
 */

/*
 * initialize rl compat stuff
 */
int
rl_initialize(void)
{
      HistEvent ev;
      const LineInfo *li;
      int i;
      int editmode = 1;
      struct termios t;

      if (e != NULL)
            el_end(e);
      if (h != NULL)
            history_end(h);

      if (!rl_instream)
            rl_instream = stdin;
      if (!rl_outstream)
            rl_outstream = stdout;

      /*
       * See if we don't really want to run the editor
       */
      if (tcgetattr(fileno(rl_instream), &t) != -1 && (t.c_lflag & ECHO) == 0)
            editmode = 0;

      e = el_init(rl_readline_name, rl_instream, rl_outstream, stderr);

      if (!editmode)
            el_set(e, EL_EDITMODE, 0);

      h = history_init();
      if (!e || !h)
            return (-1);

      history(h, &ev, H_SETSIZE, INT_MAX);      /* unlimited */
      history_length = 0;
      max_input_history = INT_MAX;
      el_set(e, EL_HIST, history, h);

      /* for proper prompt printing in readline() */
      rl_prompt = strdup("");
      if (rl_prompt == NULL) {
            history_end(h);
            el_end(e);
            return -1;
      }
      el_set(e, EL_PROMPT, _get_prompt);
      el_set(e, EL_SIGNAL, rl_catch_signals);

      /* set default mode to "emacs"-style and read setting afterwards */
      /* so this can be overriden */
      el_set(e, EL_EDITOR, "emacs");
      if (rl_terminal_name != NULL)
            el_set(e, EL_TERMINAL, rl_terminal_name);
      else
            el_get(e, EL_TERMINAL, &rl_terminal_name);

      /*
       * Word completion - this has to go AFTER rebinding keys
       * to emacs-style.
       */
      el_set(e, EL_ADDFN, "rl_complete",
          "ReadLine compatible completion function",
          _el_rl_complete);
      el_set(e, EL_BIND, "^I", "rl_complete", NULL);

      /*
       * Send TSTP when ^Z is pressed.
       */
      el_set(e, EL_ADDFN, "rl_tstp",
          "ReadLine compatible suspend function",
          _el_rl_tstp);
      el_set(e, EL_BIND, "^Z", "rl_tstp", NULL);

      /*
       * Find out where the rl_complete function was added; this is
       * used later to detect that lastcmd was also rl_complete.
       */
      for(i=EL_NUM_FCNS; i < e->el_map.nfunc; i++) {
            if (e->el_map.func[i] == _el_rl_complete) {
                  el_rl_complete_cmdnum = i;
                  break;
            }
      }
            
      /* read settings from configuration file */
      el_source(e, NULL);

      /*
       * Unfortunately, some applications really do use rl_point
       * and rl_line_buffer directly.
       */
      li = el_line(e);
      /* a cheesy way to get rid of const cast. */
      rl_line_buffer = memchr(li->buffer, *li->buffer, 1);
      rl_point = rl_end = 0;

      if (rl_startup_hook)
            (*rl_startup_hook)(NULL, 0);

      return (0);
}


/*
 * read one line from input stream and return it, chomping
 * trailing newline (if there is any)
 */
char *
readline(const char *prompt)
{
      HistEvent ev;
      int count;
      const char *ret;
      char *buf;
      static int used_event_hook;

      if (e == NULL || h == NULL)
            rl_initialize();

      rl_done = 0;

      /* update prompt accordingly to what has been passed */
      if (!prompt)
            prompt = "";
      if (strcmp(rl_prompt, prompt) != 0) {
            free(rl_prompt);
            rl_prompt = strdup(prompt);
            if (rl_prompt == NULL)
                  return NULL;
      }

      if (rl_pre_input_hook)
            (*rl_pre_input_hook)(NULL, 0);

      if (rl_event_hook && !(e->el_flags&NO_TTY)) {
            el_set(e, EL_GETCFN, _rl_event_read_char);
            used_event_hook = 1;
      }

      if (!rl_event_hook && used_event_hook) {
            el_set(e, EL_GETCFN, EL_BUILTIN_GETCFN);
            used_event_hook = 0;
      }

      rl_already_prompted = 0;

      /* get one line from input stream */
      ret = el_gets(e, &count);

      if (ret && count > 0) {
            int lastidx;

            buf = strdup(ret);
            if (buf == NULL)
                  return NULL;
            lastidx = count - 1;
            if (buf[lastidx] == '\n')
                  buf[lastidx] = '\0';
      } else
            buf = NULL;

      history(h, &ev, H_GETSIZE);
      history_length = ev.num;

      return buf;
}

/*
 * history functions
 */

/*
 * is normally called before application starts to use
 * history expansion functions
 */
void
using_history(void)
{
      if (h == NULL || e == NULL)
            rl_initialize();
}


/*
 * substitute ``what'' with ``with'', returning resulting string; if
 * globally == 1, substitutes all occurrences of what, otherwise only the
 * first one
 */
static char *
_rl_compat_sub(const char *str, const char *what, const char *with,
    int globally)
{
      const char  *s;
      char  *r, *result;
      size_t      len, with_len, what_len;

      len = strlen(str);
      with_len = strlen(with);
      what_len = strlen(what);

      /* calculate length we need for result */
      s = str;
      while (*s) {
            if (*s == *what && !strncmp(s, what, what_len)) {
                  len += with_len - what_len;
                  if (!globally)
                        break;
                  s += what_len;
            } else
                  s++;
      }
      r = result = malloc(len + 1);
      if (result == NULL)
            return NULL;
      s = str;
      while (*s) {
            if (*s == *what && !strncmp(s, what, what_len)) {
                  (void)strncpy(r, with, with_len);
                  r += with_len;
                  s += what_len;
                  if (!globally) {
                        (void)strcpy(r, s);
                        return(result);
                  }
            } else
                  *r++ = *s++;
      }
      *r = 0;
      return(result);
}

static      char  *last_search_pat; /* last !?pat[?] search pattern */
static      char  *last_search_match;     /* last !?pat[?] that matched */

const char *
get_history_event(const char *cmd, int *cindex, int qchar)
{
      int idx, sign, sub, num, begin, ret;
      size_t len;
      char  *pat;
      const char *rptr;
      HistEvent ev;

      idx = *cindex;
      if (cmd[idx++] != history_expansion_char)
            return(NULL);

      /* find out which event to take */
      if (cmd[idx] == history_expansion_char || cmd[idx] == 0) {
            if (history(h, &ev, H_FIRST) != 0)
                  return(NULL);
            *cindex = cmd[idx]? (idx + 1):idx;
            return(ev.str);
      }
      sign = 0;
      if (cmd[idx] == '-') {
            sign = 1;
            idx++;
      }

      if ('0' <= cmd[idx] && cmd[idx] <= '9') {
            HIST_ENTRY *rl_he;

            num = 0;
            while (cmd[idx] && '0' <= cmd[idx] && cmd[idx] <= '9') {
                  num = num * 10 + cmd[idx] - '0';
                  idx++;
            }
            if (sign)
                  num = history_length - num + 1;

            if (!(rl_he = history_get(num)))
                  return(NULL);

            *cindex = idx;
            return(rl_he->line);
      }
      sub = 0;
      if (cmd[idx] == '?') {
            sub = 1;
            idx++;
      }
      begin = idx;
      while (cmd[idx]) {
            if (cmd[idx] == '\n')
                  break;
            if (sub && cmd[idx] == '?')
                  break;
            if (!sub && (cmd[idx] == ':' || cmd[idx] == ' '
                            || cmd[idx] == '\t' || cmd[idx] == qchar))
                  break;
            idx++;
      }
      len = idx - begin;
      if (sub && cmd[idx] == '?')
            idx++;
      if (sub && len == 0 && last_search_pat && *last_search_pat)
            pat = last_search_pat;
      else if (len == 0)
            return(NULL);
      else {
            if ((pat = malloc(len + 1)) == NULL)
                  return NULL;
            (void)strncpy(pat, cmd + begin, len);
            pat[len] = '\0';
      }

      if (history(h, &ev, H_CURR) != 0) {
            if (pat != last_search_pat)
                  free(pat);
            return (NULL);
      }
      num = ev.num;

      if (sub) {
            if (pat != last_search_pat) {
                  if (last_search_pat)
                        free(last_search_pat);
                  last_search_pat = pat;
            }
            ret = history_search(pat, -1);
      } else
            ret = history_search_prefix(pat, -1);

      if (ret == -1) {
            /* restore to end of list on failed search */
            history(h, &ev, H_FIRST);
            (void)fprintf(rl_outstream, "%s: Event not found\n", pat);
            if (pat != last_search_pat)
                  free(pat);
            return(NULL);
      }

      if (sub && len) {
            if (last_search_match && last_search_match != pat)
                  free(last_search_match);
            last_search_match = pat;
      }

      if (pat != last_search_pat)
            free(pat);

      if (history(h, &ev, H_CURR) != 0)
            return(NULL);
      *cindex = idx;
      rptr = ev.str;

      /* roll back to original position */
      (void)history(h, &ev, H_SET, num);

      return rptr;
}

/*
 * the real function doing history expansion - takes as argument command
 * to do and data upon which the command should be executed
 * does expansion the way I've understood readline documentation
 *
 * returns 0 if data was not modified, 1 if it was and 2 if the string
 * should be only printed and not executed; in case of error,
 * returns -1 and *result points to NULL
 * it's callers responsibility to free() string returned in *result
 */
static int
_history_expand_command(const char *command, size_t offs, size_t cmdlen,
    char **result)
{
      char *tmp, *search = NULL, *aptr;
      const char *ptr, *cmd;
      static char *from = NULL, *to = NULL;
      int start, end, idx, has_mods = 0;
      int p_on = 0, g_on = 0;

      *result = NULL;
      aptr = NULL;
      ptr = NULL;

      /* First get event specifier */
      idx = 0;

      if (strchr(":^*$", command[offs + 1])) {
            char str[4];
            /*
            * "!:" is shorthand for "!!:".
            * "!^", "!*" and "!$" are shorthand for
            * "!!:^", "!!:*" and "!!:$" respectively.
            */
            str[0] = str[1] = '!';
            str[2] = '0';
            ptr = get_history_event(str, &idx, 0);
            idx = (command[offs + 1] == ':')? 1:0;
            has_mods = 1;
      } else {
            if (command[offs + 1] == '#') {
                  /* use command so far */
                  if ((aptr = malloc(offs + 1)) == NULL)
                        return -1;
                  (void)strncpy(aptr, command, offs);
                  aptr[offs] = '\0';
                  idx = 1;
            } else {
                  int   qchar;

                  qchar = (offs > 0 && command[offs - 1] == '"')? '"':0;
                  ptr = get_history_event(command + offs, &idx, qchar);
            }
            has_mods = command[offs + idx] == ':';
      }

      if (ptr == NULL && aptr == NULL)
            return(-1);

      if (!has_mods) {
            *result = strdup(aptr? aptr : ptr);
            if (aptr)
                  free(aptr);
            return(1);
      }

      cmd = command + offs + idx + 1;

      /* Now parse any word designators */

      if (*cmd == '%')  /* last word matched by ?pat? */
            tmp = strdup(last_search_match? last_search_match:"");
      else if (strchr("^*$-0123456789", *cmd)) {
            start = end = -1;
            if (*cmd == '^')
                  start = end = 1, cmd++;
            else if (*cmd == '$')
                  start = -1, cmd++;
            else if (*cmd == '*')
                  start = 1, cmd++;
             else if (*cmd == '-' || isdigit((unsigned char) *cmd)) {
                  start = 0;
                  while (*cmd && '0' <= *cmd && *cmd <= '9')
                        start = start * 10 + *cmd++ - '0';

                  if (*cmd == '-') {
                        if (isdigit((unsigned char) cmd[1])) {
                              cmd++;
                              end = 0;
                              while (*cmd && '0' <= *cmd && *cmd <= '9')
                                    end = end * 10 + *cmd++ - '0';
                        } else if (cmd[1] == '$') {
                              cmd += 2;
                              end = -1;
                        } else {
                              cmd++;
                              end = -2;
                        }
                  } else if (*cmd == '*')
                        end = -1, cmd++;
                  else
                        end = start;
            }
            tmp = history_arg_extract(start, end, aptr? aptr:ptr);
            if (tmp == NULL) {
                  (void)fprintf(rl_outstream, "%s: Bad word specifier",
                      command + offs + idx);
                  if (aptr)
                        free(aptr);
                  return(-1);
            }
      } else
            tmp = strdup(aptr? aptr:ptr);

      if (aptr)
            free(aptr);

      if (*cmd == 0 || (cmd - (command + offs) >= cmdlen)) {
            *result = tmp;
            return(1);
      }

      for (; *cmd; cmd++) {
            if (*cmd == ':')
                  continue;
            else if (*cmd == 'h') {       /* remove trailing path */
                  if ((aptr = strrchr(tmp, '/')) != NULL)
                        *aptr = 0;
            } else if (*cmd == 't') {     /* remove leading path */
                  if ((aptr = strrchr(tmp, '/')) != NULL) {
                        aptr = strdup(aptr + 1);
                        free(tmp);
                        tmp = aptr;
                  }
            } else if (*cmd == 'r') {     /* remove trailing suffix */
                  if ((aptr = strrchr(tmp, '.')) != NULL)
                        *aptr = 0;
            } else if (*cmd == 'e') {     /* remove all but suffix */
                  if ((aptr = strrchr(tmp, '.')) != NULL) {
                        aptr = strdup(aptr);
                        free(tmp);
                        tmp = aptr;
                  }
            } else if (*cmd == 'p')       /* print only */
                  p_on = 1;
            else if (*cmd == 'g')
                  g_on = 2;
            else if (*cmd == 's' || *cmd == '&') {
                  char *what, *with, delim;
                  size_t len, from_len;
                  size_t size;

                  if (*cmd == '&' && (from == NULL || to == NULL))
                        continue;
                  else if (*cmd == 's') {
                        delim = *(++cmd), cmd++;
                        size = 16;
                        what = realloc(from, size);
                        if (what == NULL) {
                              free(from);
                              return 0;
                        }
                        len = 0;
                        for (; *cmd && *cmd != delim; cmd++) {
                              if (*cmd == '\\' && cmd[1] == delim)
                                    cmd++;
                              if (len >= size) {
                                    char *nwhat;
                                    nwhat = realloc(what,
                                                (size <<= 1));
                                    if (nwhat == NULL) {
                                          free(what);
                                          return 0;
                                    }
                                    what = nwhat;
                              }
                              what[len++] = *cmd;
                        }
                        what[len] = '\0';
                        from = what;
                        if (*what == '\0') {
                              free(what);
                              if (search) {
                                    from = strdup(search);
                                    if (from == NULL)
                                          return 0;
                              } else {
                                    from = NULL;
                                    return (-1);
                              }
                        }
                        cmd++;      /* shift after delim */
                        if (!*cmd)
                              continue;

                        size = 16;
                        with = realloc(to, size);
                        if (with == NULL) {
                              free(to);
                              return -1;
                        }
                        len = 0;
                        from_len = strlen(from);
                        for (; *cmd && *cmd != delim; cmd++) {
                              if (len + from_len + 1 >= size) {
                                    char *nwith;
                                    size += from_len + 1;
                                    nwith = realloc(with, size);
                                    if (nwith == NULL) {
                                          free(with);
                                          return -1;
                                    }
                                    with = nwith;
                              }
                              if (*cmd == '&') {
                                    /* safe */
                                    (void)strcpy(&with[len], from);
                                    len += from_len;
                                    continue;
                              }
                              if (*cmd == '\\'
                                  && (*(cmd + 1) == delim
                                    || *(cmd + 1) == '&'))
                                    cmd++;
                              with[len++] = *cmd;
                        }
                        with[len] = '\0';
                        to = with;
                  }

                  aptr = _rl_compat_sub(tmp, from, to, g_on);
                  if (aptr) {
                        free(tmp);
                        tmp = aptr;
                  }
                  g_on = 0;
            }
      }
      *result = tmp;
      return (p_on? 2:1);
}


/*
 * csh-style history expansion
 */
int
history_expand(char *str, char **output)
{
      int ret = 0;
      size_t idx, i, size;
      char *tmp, *result;

      if (h == NULL || e == NULL)
            rl_initialize();

      if (history_expansion_char == 0) {
            *output = strdup(str);
            return(0);
      }

      *output = NULL;
      if (str[0] == history_subst_char) {
            /* ^foo^foo2^ is equivalent to !!:s^foo^foo2^ */
            *output = malloc(strlen(str) + 4 + 1);
            if (*output == NULL)
                  return 0;
            (*output)[0] = (*output)[1] = history_expansion_char;
            (*output)[2] = ':';
            (*output)[3] = 's';
            (void)strcpy((*output) + 4, str);
            str = *output;
      } else {
            *output = strdup(str);
            if (*output == NULL)
                  return 0;
      }

#define ADD_STRING(what, len)                               \
      {                                               \
            if (idx + len + 1 > size) {                     \
                  char *nresult = realloc(result, (size += len + 1));\
                  if (nresult == NULL) {                    \
                        free(*output);                      \
                        return 0;                     \
                  }                                   \
                  result = nresult;                   \
            }                                         \
            (void)strncpy(&result[idx], what, len);               \
            idx += len;                               \
            result[idx] = '\0';                             \
      }

      result = NULL;
      size = idx = 0;
      for (i = 0; str[i];) {
            int qchar, loop_again;
            size_t len, start, j;

            qchar = 0;
            loop_again = 1;
            start = j = i;
loop:
            for (; str[j]; j++) {
                  if (str[j] == '\\' &&
                      str[j + 1] == history_expansion_char) {
                        (void)strcpy(&str[j], &str[j + 1]);
                        continue;
                  }
                  if (!loop_again) {
                        if (isspace((unsigned char) str[j])
                            || str[j] == qchar)
                              break;
                  }
                  if (str[j] == history_expansion_char
                      && !strchr(history_no_expand_chars, str[j + 1])
                      && (!history_inhibit_expansion_function ||
                      (*history_inhibit_expansion_function)(str,
                      (int)j) == 0))
                        break;
            }

            if (str[j] && loop_again) {
                  i = j;
                  qchar = (j > 0 && str[j - 1] == '"' )? '"':0;
                  j++;
                  if (str[j] == history_expansion_char)
                        j++;
                  loop_again = 0;
                  goto loop;
            }
            len = i - start;
            tmp = &str[start];
            ADD_STRING(tmp, len);

            if (str[i] == '\0' || str[i] != history_expansion_char) {
                  len = j - i;
                  tmp = &str[i];
                  ADD_STRING(tmp, len);
                  if (start == 0)
                        ret = 0;
                  else
                        ret = 1;
                  break;
            }
            ret = _history_expand_command (str, i, (j - i), &tmp);
            if (ret > 0 && tmp) {
                  len = strlen(tmp);
                  ADD_STRING(tmp, len);
                  free(tmp);
            }
            i = j;
      }

      /* ret is 2 for "print only" option */
      if (ret == 2) {
            add_history(result);
#ifdef GDB_411_HACK
            /* gdb 4.11 has been shipped with readline, where */
            /* history_expand() returned -1 when the line     */
            /* should not be executed; in readline 2.1+       */
            /* it should return 2 in such a case              */
            ret = -1;
#endif
      }
      free(*output);
      *output = result;

      return (ret);
}

/*
* Return a string consisting of arguments of "str" from "start" to "end".
*/
char *
history_arg_extract(int start, int end, const char *str)
{
      size_t  i, len, max;
      char  **arr, *result;

      arr = history_tokenize(str);
      if (!arr)
            return(NULL);
      if (arr && *arr == NULL) {
            free(arr);
            return(NULL);
      }

      for (max = 0; arr[max]; max++)
            continue;
      max--;

      if (start == '$')
            start = max;
      if (end == '$')
            end = max;
      if (end < 0)
            end = max + end + 1;
      if (start < 0)
            start = end;

      if (start < 0 || end < 0 || start > max || end > max || start > end)
            return(NULL);

      for (i = start, len = 0; i <= end; i++)
            len += strlen(arr[i]) + 1;
      len++;
      result = malloc(len);
      if (result == NULL)
            return NULL;

      for (i = start, len = 0; i <= end; i++) {
            (void)strcpy(result + len, arr[i]);
            len += strlen(arr[i]);
            if (i < end)
                  result[len++] = ' ';
      }
      result[len] = 0;

      for (i = 0; arr[i]; i++)
            free(arr[i]);
      free(arr);

      return(result);
}

/*
 * Parse the string into individual tokens,
 * similar to how shell would do it.
 */
char **
history_tokenize(const char *str)
{
      int size = 1, idx = 0, i, start;
      size_t len;
      char **result = NULL, *temp, delim = '\0';

      for (i = 0; str[i];) {
            while (isspace((unsigned char) str[i]))
                  i++;
            start = i;
            for (; str[i];) {
                  if (str[i] == '\\') {
                        if (str[i+1] != '\0')
                              i++;
                  } else if (str[i] == delim)
                        delim = '\0';
                  else if (!delim &&
                            (isspace((unsigned char) str[i]) ||
                        strchr("()<>;&|$", str[i])))
                        break;
                  else if (!delim && strchr("'`\"", str[i]))
                        delim = str[i];
                  if (str[i])
                        i++;
            }

            if (idx + 2 >= size) {
                  char **nresult;
                  size <<= 1;
                  nresult = realloc(result, size * sizeof(char *));
                  if (nresult == NULL) {
                        free(result);
                        return NULL;
                  }
                  result = nresult;
            }
            len = i - start;
            temp = malloc(len + 1);
            if (temp == NULL) {
                  for (i = 0; i < idx; i++)
                        free(result[i]);
                  free(result);
                  return NULL;
            }
            (void)strncpy(temp, &str[start], len);
            temp[len] = '\0';
            result[idx++] = temp;
            result[idx] = NULL;
            if (str[i])
                  i++;
      }
      return (result);
}


/*
 * limit size of history record to ``max'' events
 */
void
stifle_history(int max)
{
      HistEvent ev;

      if (h == NULL || e == NULL)
            rl_initialize();

      if (history(h, &ev, H_SETSIZE, max) == 0)
            max_input_history = max;
}


/*
 * "unlimit" size of history - set the limit to maximum allowed int value
 */
int
unstifle_history(void)
{
      HistEvent ev;
      int omax;

      history(h, &ev, H_SETSIZE, INT_MAX);
      omax = max_input_history;
      max_input_history = INT_MAX;
      return (omax);          /* some value _must_ be returned */
}


int
history_is_stifled(void)
{

      /* cannot return true answer */
      return (max_input_history != INT_MAX);
}


/*
 * read history from a file given
 */
int
read_history(const char *filename)
{
      HistEvent ev;

      if (h == NULL || e == NULL)
            rl_initialize();
      return (history(h, &ev, H_LOAD, filename));
}


/*
 * write history to a file given
 */
int
write_history(const char *filename)
{
      HistEvent ev;

      if (h == NULL || e == NULL)
            rl_initialize();
      return (history(h, &ev, H_SAVE, filename));
}


/*
 * returns history ``num''th event
 *
 * returned pointer points to static variable
 */
HIST_ENTRY *
history_get(int num)
{
      static HIST_ENTRY she;
      HistEvent ev;
      int curr_num;

      if (h == NULL || e == NULL)
            rl_initialize();

      /* save current position */
      if (history(h, &ev, H_CURR) != 0)
            return (NULL);
      curr_num = ev.num;

      /* start from most recent */
      if (history(h, &ev, H_FIRST) != 0)
            return (NULL);    /* error */

      /* look backwards for event matching specified offset */
      if (history(h, &ev, H_NEXT_EVENT, num))
            return (NULL);

      she.line = ev.str;
      she.data = NULL;

      /* restore pointer to where it was */
      (void)history(h, &ev, H_SET, curr_num);

      return (&she);
}


/*
 * add the line to history table
 */
int
add_history(const char *line)
{
      HistEvent ev;

      if (h == NULL || e == NULL)
            rl_initialize();

      (void)history(h, &ev, H_ENTER, line);
      if (history(h, &ev, H_GETSIZE) == 0)
            history_length = ev.num;

      return (!(history_length > 0)); /* return 0 if all is okay */
}


/*
 * clear the history list - delete all entries
 */
void
clear_history(void)
{
      HistEvent ev;

      history(h, &ev, H_CLEAR);
}


/*
 * returns offset of the current history event
 */
int
where_history(void)
{
      HistEvent ev;
      int curr_num, off;

      if (history(h, &ev, H_CURR) != 0)
            return (0);
      curr_num = ev.num;

      history(h, &ev, H_FIRST);
      off = 1;
      while (ev.num != curr_num && history(h, &ev, H_NEXT) == 0)
            off++;

      return (off);
}


/*
 * returns current history event or NULL if there is no such event
 */
HIST_ENTRY *
current_history(void)
{

      return (_move_history(H_CURR));
}


/*
 * returns total number of bytes history events' data are using
 */
int
history_total_bytes(void)
{
      HistEvent ev;
      int curr_num, size;

      if (history(h, &ev, H_CURR) != 0)
            return (-1);
      curr_num = ev.num;

      history(h, &ev, H_FIRST);
      size = 0;
      do
            size += strlen(ev.str);
      while (history(h, &ev, H_NEXT) == 0);

      /* get to the same position as before */
      history(h, &ev, H_PREV_EVENT, curr_num);

      return (size);
}


/*
 * sets the position in the history list to ``pos''
 */
int
history_set_pos(int pos)
{
      HistEvent ev;
      int curr_num;

      if (pos > history_length || pos < 0)
            return (-1);

      history(h, &ev, H_CURR);
      curr_num = ev.num;

      if (history(h, &ev, H_SET, pos)) {
            history(h, &ev, H_SET, curr_num);
            return(-1);
      }
      return (0);
}


/*
 * returns previous event in history and shifts pointer accordingly
 */
HIST_ENTRY *
previous_history(void)
{

      return (_move_history(H_PREV));
}


/*
 * returns next event in history and shifts pointer accordingly
 */
HIST_ENTRY *
next_history(void)
{

      return (_move_history(H_NEXT));
}


/*
 * searches for first history event containing the str
 */
int
history_search(const char *str, int direction)
{
      HistEvent ev;
      const char *strp;
      int curr_num;

      if (history(h, &ev, H_CURR) != 0)
            return (-1);
      curr_num = ev.num;

      for (;;) {
            if ((strp = strstr(ev.str, str)) != NULL)
                  return (int) (strp - ev.str);
            if (history(h, &ev, direction < 0 ? H_NEXT:H_PREV) != 0)
                  break;
      }
      history(h, &ev, H_SET, curr_num);
      return (-1);
}


/*
 * searches for first history event beginning with str
 */
int
history_search_prefix(const char *str, int direction)
{
      HistEvent ev;

      return (history(h, &ev, direction < 0? H_PREV_STR:H_NEXT_STR, str));
}


/*
 * search for event in history containing str, starting at offset
 * abs(pos); continue backward, if pos<0, forward otherwise
 */
/* ARGSUSED */
int
history_search_pos(const char *str,
               int direction __attribute__((__unused__)), int pos)
{
      HistEvent ev;
      int curr_num, off;

      off = (pos > 0) ? pos : -pos;
      pos = (pos > 0) ? 1 : -1;

      if (history(h, &ev, H_CURR) != 0)
            return (-1);
      curr_num = ev.num;

      if (history_set_pos(off) != 0 || history(h, &ev, H_CURR) != 0)
            return (-1);


      for (;;) {
            if (strstr(ev.str, str))
                  return (off);
            if (history(h, &ev, (pos < 0) ? H_PREV : H_NEXT) != 0)
                  break;
      }

      /* set "current" pointer back to previous state */
      history(h, &ev, (pos < 0) ? H_NEXT_EVENT : H_PREV_EVENT, curr_num);

      return (-1);
}


/********************************/
/* completion functions */

/*
 * does tilde expansion of strings of type ``~user/foo''
 * if ``user'' isn't valid user name or ``txt'' doesn't start
 * w/ '~', returns pointer to strdup()ed copy of ``txt''
 *
 * it's callers's responsibility to free() returned string
 */
char *
tilde_expand(char *txt)
{
      struct passwd *pass;
      char *temp;
      size_t len = 0;

      if (txt[0] != '~')
            return (strdup(txt));

      temp = strchr(txt + 1, '/');
      if (temp == NULL) {
            temp = strdup(txt + 1);
            if (temp == NULL)
                  return NULL;
      } else {
            len = temp - txt + 1;   /* text until string after slash */
            temp = malloc(len);
            if (temp == NULL)
                  return NULL;
            (void)strncpy(temp, txt + 1, len - 2);
            temp[len - 2] = '\0';
      }
      pass = getpwnam(temp);
      free(temp);       /* value no more needed */
      if (pass == NULL)
            return (strdup(txt));

      /* update pointer txt to point at string immedially following */
      /* first slash */
      txt += len;

      temp = malloc(strlen(pass->pw_dir) + 1 + strlen(txt) + 1);
      if (temp == NULL)
            return NULL;
      (void)sprintf(temp, "%s/%s", pass->pw_dir, txt);

      return (temp);
}


/*
 * return first found file name starting by the ``text'' or NULL if no
 * such file can be found
 * value of ``state'' is ignored
 *
 * it's caller's responsibility to free returned string
 */
char *
filename_completion_function(const char *text, int state)
{
      static DIR *dir = NULL;
      static char *filename = NULL, *dirname = NULL;
      static size_t filename_len = 0;
      struct dirent *entry;
      char *temp;
      size_t len;

      if (state == 0 || dir == NULL) {
            temp = strrchr(text, '/');
            if (temp) {
                  char *nptr;
                  temp++;
                  nptr = realloc(filename, strlen(temp) + 1);
                  if (nptr == NULL) {
                        free(filename);
                        return NULL;
                  }
                  filename = nptr;
                  (void)strcpy(filename, temp);
                  len = temp - text;      /* including last slash */
                  nptr = realloc(dirname, len + 1);
                  if (nptr == NULL) {
                        free(filename);
                        return NULL;
                  }
                  dirname = nptr;
                  (void)strncpy(dirname, text, len);
                  dirname[len] = '\0';
            } else {
                  if (*text == 0)
                        filename = NULL;
                  else {
                        filename = strdup(text);
                        if (filename == NULL)
                              return NULL;
                  }
                  dirname = NULL;
            }

            /* support for ``~user'' syntax */
            if (dirname && *dirname == '~') {
                  char *nptr;
                  temp = tilde_expand(dirname);
                  if (temp == NULL)
                        return NULL;
                  nptr = realloc(dirname, strlen(temp) + 1);
                  if (nptr == NULL) {
                        free(dirname);
                        return NULL;
                  }
                  dirname = nptr;
                  (void)strcpy(dirname, temp);  /* safe */
                  free(temp); /* no longer needed */
            }
            /* will be used in cycle */
            filename_len = filename ? strlen(filename) : 0;

            if (dir != NULL) {
                  (void)closedir(dir);
                  dir = NULL;
            }
            dir = opendir(dirname ? dirname : ".");
            if (!dir)
                  return (NULL);    /* cannot open the directory */
      }
      /* find the match */
      while ((entry = readdir(dir)) != NULL) {
            /* skip . and .. */
            if (entry->d_name[0] == '.' && (!entry->d_name[1]
                || (entry->d_name[1] == '.' && !entry->d_name[2])))
                  continue;
            if (filename_len == 0)
                  break;
            /* otherwise, get first entry where first */
            /* filename_len characters are equal        */
            if (entry->d_name[0] == filename[0]
#if defined(__SVR4) || defined(__linux__)
                && strlen(entry->d_name) >= filename_len
#else
                && entry->d_namlen >= filename_len
#endif
                && strncmp(entry->d_name, filename,
                  filename_len) == 0)
                  break;
      }

      if (entry) {            /* match found */

            struct stat stbuf;
#if defined(__SVR4) || defined(__linux__)
            len = strlen(entry->d_name) +
#else
            len = entry->d_namlen +
#endif
                ((dirname) ? strlen(dirname) : 0) + 1 + 1;
            temp = malloc(len);
            if (temp == NULL)
                  return NULL;
            (void)sprintf(temp, "%s%s",
                dirname ? dirname : "", entry->d_name);     /* safe */

            /* test, if it's directory */
            if (stat(temp, &stbuf) == 0 && S_ISDIR(stbuf.st_mode))
                  strcat(temp, "/");      /* safe */
      } else {
            (void)closedir(dir);
            dir = NULL;
            temp = NULL;
      }

      return (temp);
}


/*
 * a completion generator for usernames; returns _first_ username
 * which starts with supplied text
 * text contains a partial username preceded by random character
 * (usually '~'); state is ignored
 * it's callers responsibility to free returned value
 */
char *
username_completion_function(const char *text, int state)
{
      struct passwd *pwd;

      if (text[0] == '\0')
            return (NULL);

      if (*text == '~')
            text++;

      if (state == 0)
            setpwent();

      while ((pwd = getpwent()) && text[0] == pwd->pw_name[0]
          && strcmp(text, pwd->pw_name) == 0);

      if (pwd == NULL) {
            endpwent();
            return (NULL);
      }
      return (strdup(pwd->pw_name));
}


/*
 * el-compatible wrapper around rl_complete; needed for key binding
 */
/* ARGSUSED */
static unsigned char
_el_rl_complete(EditLine *el __attribute__((__unused__)), int ch)
{
      return (unsigned char) rl_complete(0, ch);
}

/*
 * el-compatible wrapper to send TSTP on ^Z
 */
/* ARGSUSED */
static unsigned char
_el_rl_tstp(EditLine *el __attribute__((__unused__)), int ch __attribute__((__unused__)))
{
      (void)kill(0, SIGTSTP);
      return CC_NORM;
}

/*
 * returns list of completions for text given
 */
char **
completion_matches(const char *text, CPFunction *genfunc)
{
      char **match_list = NULL, *retstr, *prevstr;
      size_t match_list_len, max_equal, which, i;
      size_t matches;

      if (h == NULL || e == NULL)
            rl_initialize();

      matches = 0;
      match_list_len = 1;
      while ((retstr = (*genfunc) (text, (int)matches)) != NULL) {
            /* allow for list terminator here */
            if (matches + 3 >= match_list_len) {
                  char **nmatch_list;
                  while (matches + 3 >= match_list_len)
                        match_list_len <<= 1;
                  nmatch_list = realloc(match_list,
                      match_list_len * sizeof(char *));
                  if (nmatch_list == NULL) {
                        free(match_list);
                        return NULL;
                  }
                  match_list = nmatch_list;

            }
            match_list[++matches] = retstr;
      }

      if (!match_list)
            return NULL;      /* nothing found */

      /* find least denominator and insert it to match_list[0] */
      which = 2;
      prevstr = match_list[1];
      max_equal = strlen(prevstr);
      for (; which <= matches; which++) {
            for (i = 0; i < max_equal &&
                prevstr[i] == match_list[which][i]; i++)
                  continue;
            max_equal = i;
      }

      retstr = malloc(max_equal + 1);
      if (retstr == NULL) {
            free(match_list);
            return NULL;
      }
      (void)strncpy(retstr, match_list[1], max_equal);
      retstr[max_equal] = '\0';
      match_list[0] = retstr;

      /* add NULL as last pointer to the array */
      match_list[matches + 1] = (char *) NULL;

      return (match_list);
}

/*
 * Sort function for qsort(). Just wrapper around strcasecmp().
 */
static int
_rl_qsort_string_compare(i1, i2)
      const void *i1, *i2;
{
      const char *s1 = ((const char * const *)i1)[0];
      const char *s2 = ((const char * const *)i2)[0];

      return strcasecmp(s1, s2);
}

/*
 * Display list of strings in columnar format on readline's output stream.
 * 'matches' is list of strings, 'len' is number of strings in 'matches',
 * 'max' is maximum length of string in 'matches'.
 */
void
rl_display_match_list (matches, len, max)
     char **matches;
     int len, max;
{
      int i, idx, limit, count;
      int screenwidth = e->el_term.t_size.h;

      /*
       * Find out how many entries can be put on one line, count
       * with two spaces between strings.
       */
      limit = screenwidth / (max + 2);
      if (limit == 0)
            limit = 1;

      /* how many lines of output */
      count = len / limit;
      if (count * limit < len)
            count++;

      /* Sort the items if they are not already sorted. */
      qsort(&matches[1], (size_t)(len - 1), sizeof(char *),
          _rl_qsort_string_compare);

      idx = 1;
      for(; count > 0; count--) {
            for(i = 0; i < limit && matches[idx]; i++, idx++)
                  (void)fprintf(e->el_outfile, "%-*s  ", max,
                      matches[idx]);
            (void)fprintf(e->el_outfile, "\n");
      }
}

/*
 * Complete the word at or before point, called by rl_complete()
 * 'what_to_do' says what to do with the completion.
 * `?' means list the possible completions.
 * TAB means do standard completion.
 * `*' means insert all of the possible completions.
 * `!' means to do standard completion, and list all possible completions if
 * there is more than one.
 *
 * Note: '*' support is not implemented
 */
static int
rl_complete_internal(int what_to_do)
{
      Function *complet_func;
      const LineInfo *li;
      char *temp, **matches;
      const char *ctemp;
      size_t len;

      rl_completion_type = what_to_do;

      if (h == NULL || e == NULL)
            rl_initialize();

      complet_func = rl_completion_entry_function;
      if (!complet_func)
            complet_func = (Function *)(void *)filename_completion_function;

      /* We now look backwards for the start of a filename/variable word */
      li = el_line(e);
      ctemp = (const char *) li->cursor;
      while (ctemp > li->buffer
          && !strchr(rl_basic_word_break_characters, ctemp[-1])
          && (!rl_special_prefixes
            || !strchr(rl_special_prefixes, ctemp[-1]) ) )
            ctemp--;

      len = li->cursor - ctemp;
      temp = alloca(len + 1);
      (void)strncpy(temp, ctemp, len);
      temp[len] = '\0';

      /* these can be used by function called in completion_matches() */
      /* or (*rl_attempted_completion_function)() */
      rl_point = li->cursor - li->buffer;
      rl_end = li->lastchar - li->buffer;

      if (rl_attempted_completion_function) {
            int end = li->cursor - li->buffer;
            matches = (*rl_attempted_completion_function) (temp, (int)
                (end - len), end);
      } else
            matches = 0;
      if (!rl_attempted_completion_function || !matches)
            matches = completion_matches(temp, (CPFunction *)complet_func);

      if (matches) {
            int i, retval = CC_REFRESH;
            int matches_num, maxlen, match_len, match_display=1;

            /*
             * Only replace the completed string with common part of
             * possible matches if there is possible completion.
             */
            if (matches[0][0] != '\0') {
                  el_deletestr(e, (int) len);
                  el_insertstr(e, matches[0]);
            }

            if (what_to_do == '?')
                  goto display_matches;

            if (matches[2] == NULL && strcmp(matches[0], matches[1]) == 0) {
                  /*
                   * We found exact match. Add a space after
                   * it, unless we do filename completion and the
                   * object is a directory.
                   */
                  size_t alen = strlen(matches[0]);
                  if ((complet_func !=
                      (Function *)filename_completion_function
                        || (alen > 0 && (matches[0])[alen - 1] != '/'))
                      && rl_completion_append_character) {
                        char buf[2];
                        buf[0] = rl_completion_append_character;
                        buf[1] = '\0';
                        el_insertstr(e, buf);
                  }
            } else if (what_to_do == '!') {
    display_matches:
                  /*
                   * More than one match and requested to list possible
                   * matches.
                   */

                  for(i=1, maxlen=0; matches[i]; i++) {
                        match_len = strlen(matches[i]);
                        if (match_len > maxlen)
                              maxlen = match_len;
                  }
                  matches_num = i - 1;
                        
                  /* newline to get on next line from command line */
                  (void)fprintf(e->el_outfile, "\n");

                  /*
                   * If there are too many items, ask user for display
                   * confirmation.
                   */
                  if (matches_num > rl_completion_query_items) {
                        (void)fprintf(e->el_outfile,
                            "Display all %d possibilities? (y or n) ",
                            matches_num);
                        (void)fflush(e->el_outfile);
                        if (getc(stdin) != 'y')
                              match_display = 0;
                        (void)fprintf(e->el_outfile, "\n");
                  }

                  if (match_display)
                        rl_display_match_list(matches, matches_num,
                              maxlen);
                  retval = CC_REDISPLAY;
            } else if (matches[0][0]) {
                  /*
                   * There was some common match, but the name was
                   * not complete enough. Next tab will print possible
                   * completions.
                   */
                  el_beep(e);
            } else {
                  /* lcd is not a valid object - further specification */
                  /* is needed */
                  el_beep(e);
                  retval = CC_NORM;
            }

            /* free elements of array and the array itself */
            for (i = 0; matches[i]; i++)
                  free(matches[i]);
            free(matches), matches = NULL;

            return (retval);
      }
      return (CC_NORM);
}


/*
 * complete word at current point
 */
int
rl_complete(int ignore, int invoking_key)
{
      if (h == NULL || e == NULL)
            rl_initialize();

      if (rl_inhibit_completion) {
            rl_insert(ignore, invoking_key);
            return (CC_REFRESH);
      } else if (e->el_state.lastcmd == el_rl_complete_cmdnum)
            return rl_complete_internal('?');
      else if (_rl_complete_show_all)
            return rl_complete_internal('!');
      else
            return (rl_complete_internal(TAB));
}


/*
 * misc other functions
 */

/*
 * bind key c to readline-type function func
 */
int
rl_bind_key(int c, int func(int, int))
{
      int retval = -1;

      if (h == NULL || e == NULL)
            rl_initialize();

      if (func == rl_insert) {
            /* XXX notice there is no range checking of ``c'' */
            e->el_map.key[c] = ED_INSERT;
            retval = 0;
      }
      return (retval);
}


/*
 * read one key from input - handles chars pushed back
 * to input stream also
 */
int
rl_read_key(void)
{
      char fooarr[2 * sizeof(int)];

      if (e == NULL || h == NULL)
            rl_initialize();

      return (el_getc(e, fooarr));
}


/*
 * reset the terminal
 */
/* ARGSUSED */
void
rl_reset_terminal(const char *p __attribute__((__unused__)))
{

      if (h == NULL || e == NULL)
            rl_initialize();
      el_reset(e);
}


/*
 * insert character ``c'' back into input stream, ``count'' times
 */
int
rl_insert(int count, int c)
{
      char arr[2];

      if (h == NULL || e == NULL)
            rl_initialize();

      /* XXX - int -> char conversion can lose on multichars */
      arr[0] = c;
      arr[1] = '\0';

      for (; count > 0; count--)
            el_push(e, arr);

      return (0);
}

/*ARGSUSED*/
int
rl_newline(int count, int c)
{
      /*
       * Readline-4.0 appears to ignore the args.
       */
      return rl_insert(1, '\n');
}

/*ARGSUSED*/
static unsigned char
rl_bind_wrapper(EditLine *el, unsigned char c)
{
      if (map[c] == NULL)
          return CC_ERROR;
      (*map[c])(NULL, c);

      /* If rl_done was set by the above call, deal with it here */
      if (rl_done)
            return CC_EOF;

      return CC_NORM;
}

int
rl_add_defun(const char *name, Function *fun, int c)
{
      char dest[8];
      if (c >= sizeof(map) / sizeof(map[0]) || c < 0)
            return -1;
      map[(unsigned char)c] = fun;
      el_set(e, EL_ADDFN, name, name, rl_bind_wrapper);
      vis(dest, c, VIS_WHITE|VIS_NOSLASH, 0);
      el_set(e, EL_BIND, dest, name);
      return 0;
}

void
rl_callback_read_char()
{
      int count = 0, done = 0;
      const char *buf = el_gets(e, &count);
      char *wbuf;

      if (buf == NULL || count-- <= 0)
            return;
      if (count == 0 && buf[0] == CTRL('d'))
            done = 1;
      if (buf[count] == '\n' || buf[count] == '\r')
            done = 2;

      if (done && rl_linefunc != NULL) {
            el_set(e, EL_UNBUFFERED, 0);
            if (done == 2) {
                if ((wbuf = strdup(buf)) != NULL)
                  wbuf[count] = '\0';
            } else
                  wbuf = NULL;
            (*(void (*)(const char *))rl_linefunc)(wbuf);
      }
}

void 
rl_callback_handler_install (const char *prompt, VFunction *linefunc)
{
      if (e == NULL) {
            rl_initialize();
      }
      if (rl_prompt)
            free(rl_prompt);
      rl_prompt = prompt ? strdup(strchr(prompt, *prompt)) : NULL;
      rl_linefunc = linefunc;
      el_set(e, EL_UNBUFFERED, 1);
}   

void 
rl_callback_handler_remove(void)
{
      el_set(e, EL_UNBUFFERED, 0);
}

void
rl_redisplay(void)
{
      char a[2];
      a[0] = CTRL('r');
      a[1] = '\0';
      el_push(e, a);
}

int
rl_get_previous_history(int count, int key)
{
      char a[2];
      a[0] = key;
      a[1] = '\0';
      while (count--)
            el_push(e, a);
      return 0;
}

void
/*ARGSUSED*/
rl_prep_terminal(int meta_flag)
{
      el_set(e, EL_PREP_TERM, 1);
}

void
rl_deprep_terminal()
{
      el_set(e, EL_PREP_TERM, 0);
}

int
rl_read_init_file(const char *s)
{
      return(el_source(e, s));
}

int
rl_parse_and_bind(const char *line)
{
      const char **argv;
      int argc;
      Tokenizer *tok;

      tok = tok_init(NULL);
      tok_str(tok, line, &argc, &argv);
      argc = el_parse(e, argc, argv);
      tok_end(tok);
      return (argc ? 1 : 0);
}

void
rl_stuff_char(int c)
{
      char buf[2];

      buf[0] = c;
      buf[1] = '\0';
      el_insertstr(e, buf);
}

static int
_rl_event_read_char(EditLine *el, char *cp)
{
      int   n, num_read = 0;

      *cp = 0;
      while (rl_event_hook) {

            (*rl_event_hook)();

#if defined(FIONREAD)
            if (ioctl(el->el_infd, FIONREAD, &n) < 0)
                  return(-1);
            if (n)
                  num_read = read(el->el_infd, cp, 1);
            else
                  num_read = 0;
#elif defined(F_SETFL) && defined(O_NDELAY)
            if ((n = fcntl(el->el_infd, F_GETFL, 0)) < 0)
                  return(-1);
            if (fcntl(el->el_infd, F_SETFL, n|O_NDELAY) < 0)
                  return(-1);
            num_read = read(el->el_infd, cp, 1);
            if (fcntl(el->el_infd, F_SETFL, n))
                  return(-1);
#else
            /* not non-blocking, but what you gonna do? */
            num_read = read(el->el_infd, cp, 1);
            return(-1);
#endif

            if (num_read < 0 && errno == EAGAIN)
                  continue;
            if (num_read == 0)
                  continue;
            break;
      }
      if (!rl_event_hook)
            el_set(el, EL_GETCFN, EL_BUILTIN_GETCFN);
      return(num_read);
}

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