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readline.c
1 /* $NetBSD: readline.c,v 1.99 2011/08/16 16:25:15 christos Exp $ */
2 
3 /*-
4  * Copyright (c) 1997 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Jaromir Dolecek.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  * notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  * notice, this list of conditions and the following disclaimer in the
17  * documentation and/or other materials provided with the distribution.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29  * POSSIBILITY OF SUCH DAMAGE.
30  */
31 
32 #include "config.h"
33 #if !defined(lint) && !defined(SCCSID)
34 #endif /* not lint && not SCCSID */
35 
36 #include <sys/types.h>
37 #include <sys/stat.h>
38 #include <stdio.h>
39 #include <dirent.h>
40 #include <string.h>
41 #include <pwd.h>
42 #include <ctype.h>
43 #include <stdlib.h>
44 #include <unistd.h>
45 #include <limits.h>
46 #include <errno.h>
47 #include <fcntl.h>
48 #include <setjmp.h>
49 #ifdef HAVE_VIS_H
50 #include <vis.h>
51 #else
52 #include "np/vis.h"
53 #endif
54 #include "editline/readline.h"
55 #include "el.h"
56 #include "fcns.h" /* for EL_NUM_FCNS */
57 #include "histedit.h"
58 #include "filecomplete.h"
59 
60 void rl_prep_terminal(int);
61 void rl_deprep_terminal(void);
62 
63 /* for rl_complete() */
64 #define TAB '\r'
65 
66 /* see comment at the #ifdef for sense of this */
67 /* #define GDB_411_HACK */
68 
69 /* readline compatibility stuff - look at readline sources/documentation */
70 /* to see what these variables mean */
71 const char *rl_library_version = "EditLine wrapper";
72 int rl_readline_version = RL_READLINE_VERSION;
73 static char empty[] = { '\0' };
74 static char expand_chars[] = { ' ', '\t', '\n', '=', '(', '\0' };
75 static char break_chars[] = { ' ', '\t', '\n', '"', '\\', '\'', '`', '@', '$',
76  '>', '<', '=', ';', '|', '&', '{', '(', '\0' };
77 char *rl_readline_name = empty;
78 FILE *rl_instream = NULL;
79 FILE *rl_outstream = NULL;
80 int rl_point = 0;
81 int rl_end = 0;
82 char *rl_line_buffer = NULL;
83 VCPFunction *rl_linefunc = NULL;
84 int rl_done = 0;
85 VFunction *rl_event_hook = NULL;
86 KEYMAP_ENTRY_ARRAY emacs_standard_keymap,
87  emacs_meta_keymap,
88  emacs_ctlx_keymap;
89 
90 int history_base = 1; /* probably never subject to change */
91 int history_length = 0;
92 int max_input_history = 0;
93 char history_expansion_char = '!';
94 char history_subst_char = '^';
95 char *history_no_expand_chars = expand_chars;
96 Function *history_inhibit_expansion_function = NULL;
97 char *history_arg_extract(int start, int end, const char *str);
98 
99 int rl_inhibit_completion = 0;
100 int rl_attempted_completion_over = 0;
101 char *rl_basic_word_break_characters = break_chars;
102 char *rl_completer_word_break_characters = NULL;
103 char *rl_completer_quote_characters = NULL;
104 Function *rl_completion_entry_function = NULL;
105 CPPFunction *rl_attempted_completion_function = NULL;
106 Function *rl_pre_input_hook = NULL;
107 Function *rl_startup1_hook = NULL;
108 int (*rl_getc_function)(FILE *) = NULL;
109 char *rl_terminal_name = NULL;
110 int rl_already_prompted = 0;
111 int rl_filename_completion_desired = 0;
112 int rl_ignore_completion_duplicates = 0;
113 int rl_catch_signals = 1;
114 int readline_echoing_p = 1;
115 int _rl_print_completions_horizontally = 0;
116 VFunction *rl_redisplay_function = NULL;
117 Function *rl_startup_hook = NULL;
118 VFunction *rl_completion_display_matches_hook = NULL;
119 VFunction *rl_prep_term_function = (VFunction *)rl_prep_terminal;
120 VFunction *rl_deprep_term_function = (VFunction *)rl_deprep_terminal;
121 KEYMAP_ENTRY_ARRAY emacs_meta_keymap;
122 
123 /*
124  * The current prompt string.
125  */
126 char *rl_prompt = NULL;
127 /*
128  * This is set to character indicating type of completion being done by
129  * rl_complete_internal(); this is available for application completion
130  * functions.
131  */
132 int rl_completion_type = 0;
133 
134 /*
135  * If more than this number of items results from query for possible
136  * completions, we ask user if they are sure to really display the list.
137  */
138 int rl_completion_query_items = 100;
139 
140 /*
141  * List of characters which are word break characters, but should be left
142  * in the parsed text when it is passed to the completion function.
143  * Shell uses this to help determine what kind of completing to do.
144  */
145 char *rl_special_prefixes = NULL;
146 
147 /*
148  * This is the character appended to the completed words if at the end of
149  * the line. Default is ' ' (a space).
150  */
151 int rl_completion_append_character = ' ';
152 
153 /* stuff below is used internally by libedit for readline emulation */
154 
155 static History *h = NULL;
156 static EditLine *e = NULL;
157 static Function *map[256];
158 static jmp_buf topbuf;
159 
160 /* internal functions */
161 static unsigned char _el_rl_complete(EditLine *, int);
162 static unsigned char _el_rl_tstp(EditLine *, int);
163 static char *_get_prompt(EditLine *);
164 static int _getc_function(EditLine *, char *);
165 static HIST_ENTRY *_move_history(int);
166 static int _history_expand_command(const char *, size_t, size_t,
167  char **);
168 static char *_rl_compat_sub(const char *, const char *,
169  const char *, int);
170 static int _rl_event_read_char(EditLine *, char *);
171 static void _rl_update_pos(void);
172 
173 
174 /* ARGSUSED */
175 static char *
176 _get_prompt(EditLine *el __attribute__((__unused__)))
177 {
178  rl_already_prompted = 1;
179  return rl_prompt;
180 }
181 
182 
183 /*
184  * generic function for moving around history
185  */
186 static HIST_ENTRY *
187 _move_history(int op)
188 {
189  HistEvent ev;
190  static HIST_ENTRY rl_he;
191 
192  if (history(h, &ev, op) != 0)
193  return NULL;
194 
195  rl_he.line = ev.str;
196  rl_he.data = NULL;
197 
198  return &rl_he;
199 }
200 
201 
202 /*
203  * read one key from user defined input function
204  */
205 static int
206 /*ARGSUSED*/
207 _getc_function(EditLine *el __attribute__((__unused__)), char *c)
208 {
209  int i;
210 
211  i = (*rl_getc_function)(NULL);
212  if (i == -1)
213  return 0;
214  *c = (char)i;
215  return 1;
216 }
217 
218 static void
219 _resize_fun(EditLine *el, void *a)
220 {
221  const LineInfo *li;
222  char **ap = a;
223 
224  li = el_line(el);
225  /* a cheesy way to get rid of const cast. */
226  *ap = memchr(li->buffer, *li->buffer, (size_t)1);
227 }
228 
229 static const char *
230 _default_history_file(void)
231 {
232  struct passwd *p;
233  static char path[PATH_MAX];
234 
235  if (*path)
236  return path;
237  if ((p = getpwuid(getuid())) == NULL)
238  return NULL;
239  (void)snprintf(path, sizeof(path), "%s/.history", p->pw_dir);
240  return path;
241 }
242 
243 /*
244  * READLINE compatibility stuff
245  */
246 
247 /*
248  * Set the prompt
249  */
250 int
251 rl_set_prompt(const char *prompt)
252 {
253  char *p;
254 
255  if (!prompt)
256  prompt = "";
257  if (rl_prompt != NULL && strcmp(rl_prompt, prompt) == 0)
258  return 0;
259  if (rl_prompt)
260  el_free(rl_prompt);
261  rl_prompt = strdup(prompt);
262  if (rl_prompt == NULL)
263  return -1;
264 
265  while ((p = strchr(rl_prompt, RL_PROMPT_END_IGNORE)) != NULL)
266  *p = RL_PROMPT_START_IGNORE;
267 
268  return 0;
269 }
270 
271 /*
272  * initialize rl compat stuff
273  */
274 int
275 rl_initialize(void)
276 {
277  HistEvent ev;
278  int editmode = 1;
279  struct termios t;
280 
281  if (e != NULL)
282  el_end(e);
283  if (h != NULL)
284  history_end(h);
285 
286  if (!rl_instream)
287  rl_instream = stdin;
288  if (!rl_outstream)
289  rl_outstream = stdout;
290 
291  /*
292  * See if we don't really want to run the editor
293  */
294  if (tcgetattr(fileno(rl_instream), &t) != -1 && (t.c_lflag & ECHO) == 0)
295  editmode = 0;
296 
297  e = el_init(rl_readline_name, rl_instream, rl_outstream, stderr);
298 
299  if (!editmode)
300  el_set(e, EL_EDITMODE, 0);
301 
302  h = history_init();
303  if (!e || !h)
304  return -1;
305 
306  history(h, &ev, H_SETSIZE, INT_MAX); /* unlimited */
307  history_length = 0;
308  max_input_history = INT_MAX;
309  el_set(e, EL_HIST, history, h);
310 
311  /* Setup resize function */
312  el_set(e, EL_RESIZE, _resize_fun, &rl_line_buffer);
313 
314  /* setup getc function if valid */
315  if (rl_getc_function)
316  el_set(e, EL_GETCFN, _getc_function);
317 
318  /* for proper prompt printing in readline() */
319  if (rl_set_prompt("") == -1) {
320  history_end(h);
321  el_end(e);
322  return -1;
323  }
324  el_set(e, EL_PROMPT, _get_prompt, RL_PROMPT_START_IGNORE);
325  el_set(e, EL_SIGNAL, rl_catch_signals);
326 
327  /* set default mode to "emacs"-style and read setting afterwards */
328  /* so this can be overriden */
329  el_set(e, EL_EDITOR, "emacs");
330  if (rl_terminal_name != NULL)
331  el_set(e, EL_TERMINAL, rl_terminal_name);
332  else
333  el_get(e, EL_TERMINAL, &rl_terminal_name);
334 
335  /*
336  * Word completion - this has to go AFTER rebinding keys
337  * to emacs-style.
338  */
339  el_set(e, EL_ADDFN, "rl_complete",
340  "ReadLine compatible completion function",
341  _el_rl_complete);
342  el_set(e, EL_BIND, "^I", "rl_complete", NULL);
343 
344  /*
345  * Send TSTP when ^Z is pressed.
346  */
347  el_set(e, EL_ADDFN, "rl_tstp",
348  "ReadLine compatible suspend function",
349  _el_rl_tstp);
350  el_set(e, EL_BIND, "^Z", "rl_tstp", NULL);
351 
352  /*
353  * Set some readline compatible key-bindings.
354  */
355  el_set(e, EL_BIND, "^R", "em-inc-search-prev", NULL);
356 
357  /*
358  * Allow the use of Home/End keys.
359  */
360  el_set(e, EL_BIND, "\\e[1~", "ed-move-to-beg", NULL);
361  el_set(e, EL_BIND, "\\e[4~", "ed-move-to-end", NULL);
362  el_set(e, EL_BIND, "\\e[7~", "ed-move-to-beg", NULL);
363  el_set(e, EL_BIND, "\\e[8~", "ed-move-to-end", NULL);
364  el_set(e, EL_BIND, "\\e[H", "ed-move-to-beg", NULL);
365  el_set(e, EL_BIND, "\\e[F", "ed-move-to-end", NULL);
366 
367  /*
368  * Allow the use of the Delete/Insert keys.
369  */
370  el_set(e, EL_BIND, "\\e[3~", "ed-delete-next-char", NULL);
371  el_set(e, EL_BIND, "\\e[2~", "ed-quoted-insert", NULL);
372 
373  /*
374  * Ctrl-left-arrow and Ctrl-right-arrow for word moving.
375  */
376  el_set(e, EL_BIND, "\\e[1;5C", "em-next-word", NULL);
377  el_set(e, EL_BIND, "\\e[1;5D", "ed-prev-word", NULL);
378  el_set(e, EL_BIND, "\\e[5C", "em-next-word", NULL);
379  el_set(e, EL_BIND, "\\e[5D", "ed-prev-word", NULL);
380  el_set(e, EL_BIND, "\\e\\e[C", "em-next-word", NULL);
381  el_set(e, EL_BIND, "\\e\\e[D", "ed-prev-word", NULL);
382 
383  /* read settings from configuration file */
384  el_source(e, NULL);
385 
386  /*
387  * Unfortunately, some applications really do use rl_point
388  * and rl_line_buffer directly.
389  */
390  _resize_fun(e, &rl_line_buffer);
391  _rl_update_pos();
392 
393  if (rl_startup_hook)
394  (*rl_startup_hook)(NULL, 0);
395 
396  return 0;
397 }
398 
399 
400 /*
401  * read one line from input stream and return it, chomping
402  * trailing newline (if there is any)
403  */
404 char *
405 readline(const char *p)
406 {
407  HistEvent ev;
408  const char * volatile prompt = p;
409  int count;
410  const char *ret;
411  char *buf;
412  static int used_event_hook;
413 
414  if (e == NULL || h == NULL)
415  rl_initialize();
416 
417  rl_done = 0;
418 
419  (void)setjmp(topbuf);
420 
421  /* update prompt accordingly to what has been passed */
422  if (rl_set_prompt(prompt) == -1)
423  return NULL;
424 
425  if (rl_pre_input_hook)
426  (*rl_pre_input_hook)(NULL, 0);
427 
428  if (rl_event_hook && !(e->el_flags&NO_TTY)) {
429  el_set(e, EL_GETCFN, _rl_event_read_char);
430  used_event_hook = 1;
431  }
432 
433  if (!rl_event_hook && used_event_hook) {
434  el_set(e, EL_GETCFN, EL_BUILTIN_GETCFN);
435  used_event_hook = 0;
436  }
437 
438  rl_already_prompted = 0;
439 
440  /* get one line from input stream */
441  ret = el_gets(e, &count);
442 
443  if (ret && count > 0) {
444  int lastidx;
445 
446  buf = strdup(ret);
447  if (buf == NULL)
448  return NULL;
449  lastidx = count - 1;
450  if (buf[lastidx] == '\n')
451  buf[lastidx] = '\0';
452  } else
453  buf = NULL;
454 
455  history(h, &ev, H_GETSIZE);
456  history_length = ev.num;
457 
458  return buf;
459 }
460 
461 /*
462  * history functions
463  */
464 
465 /*
466  * is normally called before application starts to use
467  * history expansion functions
468  */
469 void
470 using_history(void)
471 {
472  if (h == NULL || e == NULL)
473  rl_initialize();
474 }
475 
476 
477 /*
478  * substitute ``what'' with ``with'', returning resulting string; if
479  * globally == 1, substitutes all occurrences of what, otherwise only the
480  * first one
481  */
482 static char *
483 _rl_compat_sub(const char *str, const char *what, const char *with,
484  int globally)
485 {
486  const char *s;
487  char *r, *result;
488  size_t len, with_len, what_len;
489 
490  len = strlen(str);
491  with_len = strlen(with);
492  what_len = strlen(what);
493 
494  /* calculate length we need for result */
495  s = str;
496  while (*s) {
497  if (*s == *what && !strncmp(s, what, what_len)) {
498  len += with_len - what_len;
499  if (!globally)
500  break;
501  s += what_len;
502  } else
503  s++;
504  }
505  r = result = el_malloc((len + 1) * sizeof(*r));
506  if (result == NULL)
507  return NULL;
508  s = str;
509  while (*s) {
510  if (*s == *what && !strncmp(s, what, what_len)) {
511  (void)strncpy(r, with, with_len);
512  r += with_len;
513  s += what_len;
514  if (!globally) {
515  (void)strcpy(r, s);
516  return result;
517  }
518  } else
519  *r++ = *s++;
520  }
521  *r = '\0';
522  return result;
523 }
524 
525 static char *last_search_pat; /* last !?pat[?] search pattern */
526 static char *last_search_match; /* last !?pat[?] that matched */
527 
528 const char *
529 get_history_event(const char *cmd, int *cindex, int qchar)
530 {
531  int idx, sign, sub, num, begin, ret;
532  size_t len;
533  char *pat;
534  const char *rptr;
535  HistEvent ev;
536 
537  idx = *cindex;
538  if (cmd[idx++] != history_expansion_char)
539  return NULL;
540 
541  /* find out which event to take */
542  if (cmd[idx] == history_expansion_char || cmd[idx] == '\0') {
543  if (history(h, &ev, H_FIRST) != 0)
544  return NULL;
545  *cindex = cmd[idx]? (idx + 1):idx;
546  return ev.str;
547  }
548  sign = 0;
549  if (cmd[idx] == '-') {
550  sign = 1;
551  idx++;
552  }
553 
554  if ('0' <= cmd[idx] && cmd[idx] <= '9') {
555  HIST_ENTRY *rl_he;
556 
557  num = 0;
558  while (cmd[idx] && '0' <= cmd[idx] && cmd[idx] <= '9') {
559  num = num * 10 + cmd[idx] - '0';
560  idx++;
561  }
562  if (sign)
563  num = history_length - num + 1;
564 
565  if (!(rl_he = history_get(num)))
566  return NULL;
567 
568  *cindex = idx;
569  return rl_he->line;
570  }
571  sub = 0;
572  if (cmd[idx] == '?') {
573  sub = 1;
574  idx++;
575  }
576  begin = idx;
577  while (cmd[idx]) {
578  if (cmd[idx] == '\n')
579  break;
580  if (sub && cmd[idx] == '?')
581  break;
582  if (!sub && (cmd[idx] == ':' || cmd[idx] == ' '
583  || cmd[idx] == '\t' || cmd[idx] == qchar))
584  break;
585  idx++;
586  }
587  len = (size_t)idx - (size_t)begin;
588  if (sub && cmd[idx] == '?')
589  idx++;
590  if (sub && len == 0 && last_search_pat && *last_search_pat)
591  pat = last_search_pat;
592  else if (len == 0)
593  return NULL;
594  else {
595  if ((pat = el_malloc((len + 1) * sizeof(*pat))) == NULL)
596  return NULL;
597  (void)strncpy(pat, cmd + begin, len);
598  pat[len] = '\0';
599  }
600 
601  if (history(h, &ev, H_CURR) != 0) {
602  if (pat != last_search_pat)
603  el_free(pat);
604  return NULL;
605  }
606  num = ev.num;
607 
608  if (sub) {
609  if (pat != last_search_pat) {
610  if (last_search_pat)
611  el_free(last_search_pat);
612  last_search_pat = pat;
613  }
614  ret = history_search(pat, -1);
615  } else
616  ret = history_search_prefix(pat, -1);
617 
618  if (ret == -1) {
619  /* restore to end of list on failed search */
620  history(h, &ev, H_FIRST);
621  (void)fprintf(rl_outstream, "%s: Event not found\n", pat);
622  if (pat != last_search_pat)
623  el_free(pat);
624  return NULL;
625  }
626 
627  if (sub && len) {
628  if (last_search_match && last_search_match != pat)
629  el_free(last_search_match);
630  last_search_match = pat;
631  }
632 
633  if (pat != last_search_pat)
634  el_free(pat);
635 
636  if (history(h, &ev, H_CURR) != 0)
637  return NULL;
638  *cindex = idx;
639  rptr = ev.str;
640 
641  /* roll back to original position */
642  (void)history(h, &ev, H_SET, num);
643 
644  return rptr;
645 }
646 
647 /*
648  * the real function doing history expansion - takes as argument command
649  * to do and data upon which the command should be executed
650  * does expansion the way I've understood readline documentation
651  *
652  * returns 0 if data was not modified, 1 if it was and 2 if the string
653  * should be only printed and not executed; in case of error,
654  * returns -1 and *result points to NULL
655  * it's callers responsibility to free() string returned in *result
656  */
657 static int
658 _history_expand_command(const char *command, size_t offs, size_t cmdlen,
659  char **result)
660 {
661  char *tmp, *search = NULL, *aptr;
662  const char *ptr, *cmd;
663  static char *from = NULL, *to = NULL;
664  int start, end, idx, has_mods = 0;
665  int p_on = 0, g_on = 0;
666 
667  *result = NULL;
668  aptr = NULL;
669  ptr = NULL;
670 
671  /* First get event specifier */
672  idx = 0;
673 
674  if (strchr(":^*$", command[offs + 1])) {
675  char str[4];
676  /*
677  * "!:" is shorthand for "!!:".
678  * "!^", "!*" and "!$" are shorthand for
679  * "!!:^", "!!:*" and "!!:$" respectively.
680  */
681  str[0] = str[1] = '!';
682  str[2] = '0';
683  ptr = get_history_event(str, &idx, 0);
684  idx = (command[offs + 1] == ':')? 1:0;
685  has_mods = 1;
686  } else {
687  if (command[offs + 1] == '#') {
688  /* use command so far */
689  if ((aptr = el_malloc((offs + 1) * sizeof(*aptr)))
690  == NULL)
691  return -1;
692  (void)strncpy(aptr, command, offs);
693  aptr[offs] = '\0';
694  idx = 1;
695  } else {
696  int qchar;
697 
698  qchar = (offs > 0 && command[offs - 1] == '"')? '"':0;
699  ptr = get_history_event(command + offs, &idx, qchar);
700  }
701  has_mods = command[offs + (size_t)idx] == ':';
702  }
703 
704  if (ptr == NULL && aptr == NULL)
705  return -1;
706 
707  if (!has_mods) {
708  *result = strdup(aptr ? aptr : ptr);
709  if (aptr)
710  el_free(aptr);
711  if (*result == NULL)
712  return -1;
713  return 1;
714  }
715 
716  cmd = command + offs + idx + 1;
717 
718  /* Now parse any word designators */
719 
720  if (*cmd == '%') /* last word matched by ?pat? */
721  tmp = strdup(last_search_match? last_search_match:"");
722  else if (strchr("^*$-0123456789", *cmd)) {
723  start = end = -1;
724  if (*cmd == '^')
725  start = end = 1, cmd++;
726  else if (*cmd == '$')
727  start = -1, cmd++;
728  else if (*cmd == '*')
729  start = 1, cmd++;
730  else if (*cmd == '-' || isdigit((unsigned char) *cmd)) {
731  start = 0;
732  while (*cmd && '0' <= *cmd && *cmd <= '9')
733  start = start * 10 + *cmd++ - '0';
734 
735  if (*cmd == '-') {
736  if (isdigit((unsigned char) cmd[1])) {
737  cmd++;
738  end = 0;
739  while (*cmd && '0' <= *cmd && *cmd <= '9')
740  end = end * 10 + *cmd++ - '0';
741  } else if (cmd[1] == '$') {
742  cmd += 2;
743  end = -1;
744  } else {
745  cmd++;
746  end = -2;
747  }
748  } else if (*cmd == '*')
749  end = -1, cmd++;
750  else
751  end = start;
752  }
753  tmp = history_arg_extract(start, end, aptr? aptr:ptr);
754  if (tmp == NULL) {
755  (void)fprintf(rl_outstream, "%s: Bad word specifier",
756  command + offs + idx);
757  if (aptr)
758  el_free(aptr);
759  return -1;
760  }
761  } else
762  tmp = strdup(aptr? aptr:ptr);
763 
764  if (aptr)
765  el_free(aptr);
766 
767  if (*cmd == '\0' || ((size_t)(cmd - (command + offs)) >= cmdlen)) {
768  *result = tmp;
769  return 1;
770  }
771 
772  for (; *cmd; cmd++) {
773  if (*cmd == ':')
774  continue;
775  else if (*cmd == 'h') { /* remove trailing path */
776  if ((aptr = strrchr(tmp, '/')) != NULL)
777  *aptr = '\0';
778  } else if (*cmd == 't') { /* remove leading path */
779  if ((aptr = strrchr(tmp, '/')) != NULL) {
780  aptr = strdup(aptr + 1);
781  el_free(tmp);
782  tmp = aptr;
783  }
784  } else if (*cmd == 'r') { /* remove trailing suffix */
785  if ((aptr = strrchr(tmp, '.')) != NULL)
786  *aptr = '\0';
787  } else if (*cmd == 'e') { /* remove all but suffix */
788  if ((aptr = strrchr(tmp, '.')) != NULL) {
789  aptr = strdup(aptr);
790  el_free(tmp);
791  tmp = aptr;
792  }
793  } else if (*cmd == 'p') /* print only */
794  p_on = 1;
795  else if (*cmd == 'g')
796  g_on = 2;
797  else if (*cmd == 's' || *cmd == '&') {
798  char *what, *with, delim;
799  size_t len, from_len;
800  size_t size;
801 
802  if (*cmd == '&' && (from == NULL || to == NULL))
803  continue;
804  else if (*cmd == 's') {
805  delim = *(++cmd), cmd++;
806  size = 16;
807  what = el_realloc(from, size * sizeof(*what));
808  if (what == NULL) {
809  el_free(from);
810  el_free(tmp);
811  return 0;
812  }
813  len = 0;
814  for (; *cmd && *cmd != delim; cmd++) {
815  if (*cmd == '\\' && cmd[1] == delim)
816  cmd++;
817  if (len >= size) {
818  char *nwhat;
819  nwhat = el_realloc(what,
820  (size <<= 1) *
821  sizeof(*nwhat));
822  if (nwhat == NULL) {
823  el_free(what);
824  el_free(tmp);
825  return 0;
826  }
827  what = nwhat;
828  }
829  what[len++] = *cmd;
830  }
831  what[len] = '\0';
832  from = what;
833  if (*what == '\0') {
834  el_free(what);
835  if (search) {
836  from = strdup(search);
837  if (from == NULL) {
838  el_free(tmp);
839  return 0;
840  }
841  } else {
842  from = NULL;
843  el_free(tmp);
844  return -1;
845  }
846  }
847  cmd++; /* shift after delim */
848  if (!*cmd)
849  continue;
850 
851  size = 16;
852  with = el_realloc(to, size * sizeof(*with));
853  if (with == NULL) {
854  el_free(to);
855  el_free(tmp);
856  return -1;
857  }
858  len = 0;
859  from_len = strlen(from);
860  for (; *cmd && *cmd != delim; cmd++) {
861  if (len + from_len + 1 >= size) {
862  char *nwith;
863  size += from_len + 1;
864  nwith = el_realloc(with,
865  size * sizeof(*nwith));
866  if (nwith == NULL) {
867  el_free(with);
868  el_free(tmp);
869  return -1;
870  }
871  with = nwith;
872  }
873  if (*cmd == '&') {
874  /* safe */
875  (void)strcpy(&with[len], from);
876  len += from_len;
877  continue;
878  }
879  if (*cmd == '\\'
880  && (*(cmd + 1) == delim
881  || *(cmd + 1) == '&'))
882  cmd++;
883  with[len++] = *cmd;
884  }
885  with[len] = '\0';
886  to = with;
887  }
888 
889  aptr = _rl_compat_sub(tmp, from, to, g_on);
890  if (aptr) {
891  el_free(tmp);
892  tmp = aptr;
893  }
894  g_on = 0;
895  }
896  }
897  *result = tmp;
898  return p_on? 2:1;
899 }
900 
901 
902 /*
903  * csh-style history expansion
904  */
905 int
906 history_expand(char *str, char **output)
907 {
908  int ret = 0;
909  size_t idx, i, size;
910  char *tmp, *result;
911 
912  if (h == NULL || e == NULL)
913  rl_initialize();
914 
915  if (history_expansion_char == 0) {
916  *output = strdup(str);
917  return 0;
918  }
919 
920  *output = NULL;
921  if (str[0] == history_subst_char) {
922  /* ^foo^foo2^ is equivalent to !!:s^foo^foo2^ */
923  *output = el_malloc((strlen(str) + 4 + 1) * sizeof(*output));
924  if (*output == NULL)
925  return 0;
926  (*output)[0] = (*output)[1] = history_expansion_char;
927  (*output)[2] = ':';
928  (*output)[3] = 's';
929  (void)strcpy((*output) + 4, str);
930  str = *output;
931  } else {
932  *output = strdup(str);
933  if (*output == NULL)
934  return 0;
935  }
936 
937 #define ADD_STRING(what, len, fr) \
938  { \
939  if (idx + len + 1 > size) { \
940  char *nresult = el_realloc(result, \
941  (size += len + 1) * sizeof(*nresult)); \
942  if (nresult == NULL) { \
943  el_free(*output); \
944  if (/*CONSTCOND*/fr) \
945  el_free(tmp); \
946  return 0; \
947  } \
948  result = nresult; \
949  } \
950  (void)strncpy(&result[idx], what, len); \
951  idx += len; \
952  result[idx] = '\0'; \
953  }
954 
955  result = NULL;
956  size = idx = 0;
957  tmp = NULL;
958  for (i = 0; str[i];) {
959  int qchar, loop_again;
960  size_t len, start, j;
961 
962  qchar = 0;
963  loop_again = 1;
964  start = j = i;
965 loop:
966  for (; str[j]; j++) {
967  if (str[j] == '\\' &&
968  str[j + 1] == history_expansion_char) {
969  (void)strcpy(&str[j], &str[j + 1]);
970  continue;
971  }
972  if (!loop_again) {
973  if (isspace((unsigned char) str[j])
974  || str[j] == qchar)
975  break;
976  }
977  if (str[j] == history_expansion_char
978  && !strchr(history_no_expand_chars, str[j + 1])
979  && (!history_inhibit_expansion_function ||
980  (*history_inhibit_expansion_function)(str,
981  (int)j) == 0))
982  break;
983  }
984 
985  if (str[j] && loop_again) {
986  i = j;
987  qchar = (j > 0 && str[j - 1] == '"' )? '"':0;
988  j++;
989  if (str[j] == history_expansion_char)
990  j++;
991  loop_again = 0;
992  goto loop;
993  }
994  len = i - start;
995  ADD_STRING(&str[start], len, 0);
996 
997  if (str[i] == '\0' || str[i] != history_expansion_char) {
998  len = j - i;
999  ADD_STRING(&str[i], len, 0);
1000  if (start == 0)
1001  ret = 0;
1002  else
1003  ret = 1;
1004  break;
1005  }
1006  ret = _history_expand_command (str, i, (j - i), &tmp);
1007  if (ret > 0 && tmp) {
1008  len = strlen(tmp);
1009  ADD_STRING(tmp, len, 1);
1010  }
1011  if (tmp) {
1012  el_free(tmp);
1013  tmp = NULL;
1014  }
1015  i = j;
1016  }
1017 
1018  /* ret is 2 for "print only" option */
1019  if (ret == 2) {
1020  add_history(result);
1021 #ifdef GDB_411_HACK
1022  /* gdb 4.11 has been shipped with readline, where */
1023  /* history_expand() returned -1 when the line */
1024  /* should not be executed; in readline 2.1+ */
1025  /* it should return 2 in such a case */
1026  ret = -1;
1027 #endif
1028  }
1029  el_free(*output);
1030  *output = result;
1031 
1032  return ret;
1033 }
1034 
1035 /*
1036 * Return a string consisting of arguments of "str" from "start" to "end".
1037 */
1038 char *
1039 history_arg_extract(int start, int end, const char *str)
1040 {
1041  size_t i, len, max;
1042  char **arr, *result = NULL;
1043 
1044  arr = history_tokenize(str);
1045  if (!arr)
1046  return NULL;
1047  if (arr && *arr == NULL)
1048  goto out;
1049 
1050  for (max = 0; arr[max]; max++)
1051  continue;
1052  max--;
1053 
1054  if (start == '$')
1055  start = (int)max;
1056  if (end == '$')
1057  end = (int)max;
1058  if (end < 0)
1059  end = (int)max + end + 1;
1060  if (start < 0)
1061  start = end;
1062 
1063  if (start < 0 || end < 0 || (size_t)start > max ||
1064  (size_t)end > max || start > end)
1065  goto out;
1066 
1067  for (i = (size_t)start, len = 0; i <= (size_t)end; i++)
1068  len += strlen(arr[i]) + 1;
1069  len++;
1070  result = el_malloc(len * sizeof(*result));
1071  if (result == NULL)
1072  goto out;
1073 
1074  for (i = (size_t)start, len = 0; i <= (size_t)end; i++) {
1075  (void)strcpy(result + len, arr[i]);
1076  len += strlen(arr[i]);
1077  if (i < (size_t)end)
1078  result[len++] = ' ';
1079  }
1080  result[len] = '\0';
1081 
1082 out:
1083  for (i = 0; arr[i]; i++)
1084  el_free(arr[i]);
1085  el_free(arr);
1086 
1087  return result;
1088 }
1089 
1090 /*
1091  * Parse the string into individual tokens,
1092  * similar to how shell would do it.
1093  */
1094 char **
1095 history_tokenize(const char *str)
1096 {
1097  int size = 1, idx = 0, i, start;
1098  size_t len;
1099  char **result = NULL, *temp, delim = '\0';
1100 
1101  for (i = 0; str[i];) {
1102  while (isspace((unsigned char) str[i]))
1103  i++;
1104  start = i;
1105  for (; str[i];) {
1106  if (str[i] == '\\') {
1107  if (str[i+1] != '\0')
1108  i++;
1109  } else if (str[i] == delim)
1110  delim = '\0';
1111  else if (!delim &&
1112  (isspace((unsigned char) str[i]) ||
1113  strchr("()<>;&|$", str[i])))
1114  break;
1115  else if (!delim && strchr("'`\"", str[i]))
1116  delim = str[i];
1117  if (str[i])
1118  i++;
1119  }
1120 
1121  if (idx + 2 >= size) {
1122  char **nresult;
1123  size <<= 1;
1124  nresult = el_realloc(result, (size_t)size * sizeof(*nresult));
1125  if (nresult == NULL) {
1126  el_free(result);
1127  return NULL;
1128  }
1129  result = nresult;
1130  }
1131  len = (size_t)i - (size_t)start;
1132  temp = el_malloc((size_t)(len + 1) * sizeof(*temp));
1133  if (temp == NULL) {
1134  for (i = 0; i < idx; i++)
1135  el_free(result[i]);
1136  el_free(result);
1137  return NULL;
1138  }
1139  (void)strncpy(temp, &str[start], len);
1140  temp[len] = '\0';
1141  result[idx++] = temp;
1142  result[idx] = NULL;
1143  if (str[i])
1144  i++;
1145  }
1146  return result;
1147 }
1148 
1149 
1150 /*
1151  * limit size of history record to ``max'' events
1152  */
1153 void
1154 stifle_history(int max)
1155 {
1156  HistEvent ev;
1157 
1158  if (h == NULL || e == NULL)
1159  rl_initialize();
1160 
1161  if (history(h, &ev, H_SETSIZE, max) == 0)
1162  max_input_history = max;
1163 }
1164 
1165 
1166 /*
1167  * "unlimit" size of history - set the limit to maximum allowed int value
1168  */
1169 int
1170 unstifle_history(void)
1171 {
1172  HistEvent ev;
1173  int omax;
1174 
1175  history(h, &ev, H_SETSIZE, INT_MAX);
1176  omax = max_input_history;
1177  max_input_history = INT_MAX;
1178  return omax; /* some value _must_ be returned */
1179 }
1180 
1181 
1182 int
1183 history_is_stifled(void)
1184 {
1185 
1186  /* cannot return true answer */
1187  return max_input_history != INT_MAX;
1188 }
1189 
1190 static const char _history_tmp_template[] = "/tmp/.historyXXXXXX";
1191 
1192 int
1193 history_truncate_file (const char *filename, int nlines)
1194 {
1195  int ret = 0;
1196  FILE *fp, *tp;
1197  char template[sizeof(_history_tmp_template)];
1198  char buf[4096];
1199  int fd;
1200  char *cp;
1201  off_t off;
1202  int count = 0;
1203  ssize_t left = 0;
1204 
1205  if (filename == NULL && (filename = _default_history_file()) == NULL)
1206  return errno;
1207  if ((fp = fopen(filename, "r+")) == NULL)
1208  return errno;
1209  strcpy(template, _history_tmp_template);
1210  if ((fd = mkstemp(template)) == -1) {
1211  ret = errno;
1212  goto out1;
1213  }
1214 
1215  if ((tp = fdopen(fd, "r+")) == NULL) {
1216  close(fd);
1217  ret = errno;
1218  goto out2;
1219  }
1220 
1221  for(;;) {
1222  if (fread(buf, sizeof(buf), (size_t)1, fp) != 1) {
1223  if (ferror(fp)) {
1224  ret = errno;
1225  break;
1226  }
1227  if (fseeko(fp, (off_t)sizeof(buf) * count, SEEK_SET) ==
1228  (off_t)-1) {
1229  ret = errno;
1230  break;
1231  }
1232  left = (ssize_t)fread(buf, (size_t)1, sizeof(buf), fp);
1233  if (ferror(fp)) {
1234  ret = errno;
1235  break;
1236  }
1237  if (left == 0) {
1238  count--;
1239  left = sizeof(buf);
1240  } else if (fwrite(buf, (size_t)left, (size_t)1, tp)
1241  != 1) {
1242  ret = errno;
1243  break;
1244  }
1245  fflush(tp);
1246  break;
1247  }
1248  if (fwrite(buf, sizeof(buf), (size_t)1, tp) != 1) {
1249  ret = errno;
1250  break;
1251  }
1252  count++;
1253  }
1254  if (ret)
1255  goto out3;
1256  cp = buf + left - 1;
1257  if(*cp != '\n')
1258  cp++;
1259  for(;;) {
1260  while (--cp >= buf) {
1261  if (*cp == '\n') {
1262  if (--nlines == 0) {
1263  if (++cp >= buf + sizeof(buf)) {
1264  count++;
1265  cp = buf;
1266  }
1267  break;
1268  }
1269  }
1270  }
1271  if (nlines <= 0 || count == 0)
1272  break;
1273  count--;
1274  if (fseeko(tp, (off_t)sizeof(buf) * count, SEEK_SET) < 0) {
1275  ret = errno;
1276  break;
1277  }
1278  if (fread(buf, sizeof(buf), (size_t)1, tp) != 1) {
1279  if (ferror(tp)) {
1280  ret = errno;
1281  break;
1282  }
1283  ret = EAGAIN;
1284  break;
1285  }
1286  cp = buf + sizeof(buf);
1287  }
1288 
1289  if (ret || nlines > 0)
1290  goto out3;
1291 
1292  if (fseeko(fp, (off_t)0, SEEK_SET) == (off_t)-1) {
1293  ret = errno;
1294  goto out3;
1295  }
1296 
1297  if (fseeko(tp, (off_t)sizeof(buf) * count + (cp - buf), SEEK_SET) ==
1298  (off_t)-1) {
1299  ret = errno;
1300  goto out3;
1301  }
1302 
1303  for(;;) {
1304  if ((left = (ssize_t)fread(buf, (size_t)1, sizeof(buf), tp)) == 0) {
1305  if (ferror(fp))
1306  ret = errno;
1307  break;
1308  }
1309  if (fwrite(buf, (size_t)left, (size_t)1, fp) != 1) {
1310  ret = errno;
1311  break;
1312  }
1313  }
1314  fflush(fp);
1315  if((off = ftello(fp)) > 0) {
1316  if (ftruncate(fileno(fp), off) == -1)
1317  ret = errno;
1318  }
1319 out3:
1320  fclose(tp);
1321 out2:
1322  unlink(template);
1323 out1:
1324  fclose(fp);
1325 
1326  return ret;
1327 }
1328 
1329 
1330 /*
1331  * read history from a file given
1332  */
1333 int
1334 read_history(const char *filename)
1335 {
1336  HistEvent ev;
1337 
1338  if (h == NULL || e == NULL)
1339  rl_initialize();
1340  if (filename == NULL && (filename = _default_history_file()) == NULL)
1341  return errno;
1342  return history(h, &ev, H_LOAD, filename) == -1 ?
1343  (errno ? errno : EINVAL) : 0;
1344 }
1345 
1346 
1347 /*
1348  * write history to a file given
1349  */
1350 int
1351 write_history(const char *filename)
1352 {
1353  HistEvent ev;
1354 
1355  if (h == NULL || e == NULL)
1356  rl_initialize();
1357  if (filename == NULL && (filename = _default_history_file()) == NULL)
1358  return errno;
1359  return history(h, &ev, H_SAVE, filename) == -1 ?
1360  (errno ? errno : EINVAL) : 0;
1361 }
1362 
1363 
1364 /*
1365  * returns history ``num''th event
1366  *
1367  * returned pointer points to static variable
1368  */
1369 HIST_ENTRY *
1370 history_get(int num)
1371 {
1372  static HIST_ENTRY she;
1373  HistEvent ev;
1374  int curr_num;
1375 
1376  if (h == NULL || e == NULL)
1377  rl_initialize();
1378 
1379  /* save current position */
1380  if (history(h, &ev, H_CURR) != 0)
1381  return NULL;
1382  curr_num = ev.num;
1383 
1384  /* start from the oldest */
1385  if (history(h, &ev, H_LAST) != 0)
1386  return NULL; /* error */
1387 
1388  /* look forwards for event matching specified offset */
1389  if (history(h, &ev, H_NEXT_EVDATA, num, &she.data))
1390  return NULL;
1391 
1392  she.line = ev.str;
1393 
1394  /* restore pointer to where it was */
1395  (void)history(h, &ev, H_SET, curr_num);
1396 
1397  return &she;
1398 }
1399 
1400 
1401 /*
1402  * add the line to history table
1403  */
1404 int
1405 add_history(const char *line)
1406 {
1407  HistEvent ev;
1408 
1409  if (h == NULL || e == NULL)
1410  rl_initialize();
1411 
1412  (void)history(h, &ev, H_ENTER, line);
1413  if (history(h, &ev, H_GETSIZE) == 0)
1414  history_length = ev.num;
1415 
1416  return !(history_length > 0); /* return 0 if all is okay */
1417 }
1418 
1419 
1420 /*
1421  * remove the specified entry from the history list and return it.
1422  */
1423 HIST_ENTRY *
1424 remove_history(int num)
1425 {
1426  HIST_ENTRY *he;
1427  HistEvent ev;
1428 
1429  if (h == NULL || e == NULL)
1430  rl_initialize();
1431 
1432  if ((he = el_malloc(sizeof(*he))) == NULL)
1433  return NULL;
1434 
1435  if (history(h, &ev, H_DELDATA, num, &he->data) != 0) {
1436  el_free(he);
1437  return NULL;
1438  }
1439 
1440  he->line = ev.str;
1441  if (history(h, &ev, H_GETSIZE) == 0)
1442  history_length = ev.num;
1443 
1444  return he;
1445 }
1446 
1447 
1448 /*
1449  * replace the line and data of the num-th entry
1450  */
1451 HIST_ENTRY *
1452 replace_history_entry(int num, const char *line, histdata_t data)
1453 {
1454  HIST_ENTRY *he;
1455  HistEvent ev;
1456  int curr_num;
1457 
1458  if (h == NULL || e == NULL)
1459  rl_initialize();
1460 
1461  /* save current position */
1462  if (history(h, &ev, H_CURR) != 0)
1463  return NULL;
1464  curr_num = ev.num;
1465 
1466  /* start from the oldest */
1467  if (history(h, &ev, H_LAST) != 0)
1468  return NULL; /* error */
1469 
1470  if ((he = el_malloc(sizeof(*he))) == NULL)
1471  return NULL;
1472 
1473  /* look forwards for event matching specified offset */
1474  if (history(h, &ev, H_NEXT_EVDATA, num, &he->data))
1475  goto out;
1476 
1477  he->line = strdup(ev.str);
1478  if (he->line == NULL)
1479  goto out;
1480 
1481  if (history(h, &ev, H_REPLACE, line, data))
1482  goto out;
1483 
1484  /* restore pointer to where it was */
1485  if (history(h, &ev, H_SET, curr_num))
1486  goto out;
1487 
1488  return he;
1489 out:
1490  el_free(he);
1491  return NULL;
1492 }
1493 
1494 /*
1495  * clear the history list - delete all entries
1496  */
1497 void
1498 clear_history(void)
1499 {
1500  HistEvent ev;
1501 
1502  (void)history(h, &ev, H_CLEAR);
1503  history_length = 0;
1504 }
1505 
1506 
1507 /*
1508  * returns offset of the current history event
1509  */
1510 int
1511 where_history(void)
1512 {
1513  HistEvent ev;
1514  int curr_num, off;
1515 
1516  if (history(h, &ev, H_CURR) != 0)
1517  return 0;
1518  curr_num = ev.num;
1519 
1520  (void)history(h, &ev, H_FIRST);
1521  off = 1;
1522  while (ev.num != curr_num && history(h, &ev, H_NEXT) == 0)
1523  off++;
1524 
1525  return off;
1526 }
1527 
1528 
1529 /*
1530  * returns current history event or NULL if there is no such event
1531  */
1532 HIST_ENTRY *
1533 current_history(void)
1534 {
1535 
1536  return _move_history(H_CURR);
1537 }
1538 
1539 
1540 /*
1541  * returns total number of bytes history events' data are using
1542  */
1543 int
1544 history_total_bytes(void)
1545 {
1546  HistEvent ev;
1547  int curr_num;
1548  size_t size;
1549 
1550  if (history(h, &ev, H_CURR) != 0)
1551  return -1;
1552  curr_num = ev.num;
1553 
1554  (void)history(h, &ev, H_FIRST);
1555  size = 0;
1556  do
1557  size += strlen(ev.str) * sizeof(*ev.str);
1558  while (history(h, &ev, H_NEXT) == 0);
1559 
1560  /* get to the same position as before */
1561  history(h, &ev, H_PREV_EVENT, curr_num);
1562 
1563  return (int)size;
1564 }
1565 
1566 
1567 /*
1568  * sets the position in the history list to ``pos''
1569  */
1570 int
1571 history_set_pos(int pos)
1572 {
1573  HistEvent ev;
1574  int curr_num;
1575 
1576  if (pos >= history_length || pos < 0)
1577  return -1;
1578 
1579  (void)history(h, &ev, H_CURR);
1580  curr_num = ev.num;
1581 
1582  /*
1583  * use H_DELDATA to set to nth history (without delete) by passing
1584  * (void **)-1
1585  */
1586  if (history(h, &ev, H_DELDATA, pos, (void **)-1)) {
1587  (void)history(h, &ev, H_SET, curr_num);
1588  return -1;
1589  }
1590  return 0;
1591 }
1592 
1593 
1594 /*
1595  * returns previous event in history and shifts pointer accordingly
1596  */
1597 HIST_ENTRY *
1598 previous_history(void)
1599 {
1600 
1601  return _move_history(H_PREV);
1602 }
1603 
1604 
1605 /*
1606  * returns next event in history and shifts pointer accordingly
1607  */
1608 HIST_ENTRY *
1609 next_history(void)
1610 {
1611 
1612  return _move_history(H_NEXT);
1613 }
1614 
1615 
1616 /*
1617  * searches for first history event containing the str
1618  */
1619 int
1620 history_search(const char *str, int direction)
1621 {
1622  HistEvent ev;
1623  const char *strp;
1624  int curr_num;
1625 
1626  if (history(h, &ev, H_CURR) != 0)
1627  return -1;
1628  curr_num = ev.num;
1629 
1630  for (;;) {
1631  if ((strp = strstr(ev.str, str)) != NULL)
1632  return (int)(strp - ev.str);
1633  if (history(h, &ev, direction < 0 ? H_NEXT:H_PREV) != 0)
1634  break;
1635  }
1636  (void)history(h, &ev, H_SET, curr_num);
1637  return -1;
1638 }
1639 
1640 
1641 /*
1642  * searches for first history event beginning with str
1643  */
1644 int
1645 history_search_prefix(const char *str, int direction)
1646 {
1647  HistEvent ev;
1648 
1649  return (history(h, &ev, direction < 0 ?
1650  H_PREV_STR : H_NEXT_STR, str));
1651 }
1652 
1653 
1654 /*
1655  * search for event in history containing str, starting at offset
1656  * abs(pos); continue backward, if pos<0, forward otherwise
1657  */
1658 /* ARGSUSED */
1659 int
1660 history_search_pos(const char *str,
1661  int direction __attribute__((__unused__)), int pos)
1662 {
1663  HistEvent ev;
1664  int curr_num, off;
1665 
1666  off = (pos > 0) ? pos : -pos;
1667  pos = (pos > 0) ? 1 : -1;
1668 
1669  if (history(h, &ev, H_CURR) != 0)
1670  return -1;
1671  curr_num = ev.num;
1672 
1673  if (history_set_pos(off) != 0 || history(h, &ev, H_CURR) != 0)
1674  return -1;
1675 
1676  for (;;) {
1677  if (strstr(ev.str, str))
1678  return off;
1679  if (history(h, &ev, (pos < 0) ? H_PREV : H_NEXT) != 0)
1680  break;
1681  }
1682 
1683  /* set "current" pointer back to previous state */
1684  (void)history(h, &ev,
1685  pos < 0 ? H_NEXT_EVENT : H_PREV_EVENT, curr_num);
1686 
1687  return -1;
1688 }
1689 
1690 
1691 /********************************/
1692 /* completion functions */
1693 
1694 char *
1695 tilde_expand(char *name)
1696 {
1697  return fn_tilde_expand(name);
1698 }
1699 
1700 char *
1701 filename_completion_function(const char *name, int state)
1702 {
1703  return fn_filename_completion_function(name, state);
1704 }
1705 
1706 /*
1707  * a completion generator for usernames; returns _first_ username
1708  * which starts with supplied text
1709  * text contains a partial username preceded by random character
1710  * (usually '~'); state resets search from start (??? should we do that anyway)
1711  * it's callers responsibility to free returned value
1712  */
1713 char *
1714 username_completion_function(const char *text, int state)
1715 {
1716 #if defined(HAVE_GETPW_R_POSIX) || defined(HAVE_GETPW_R_DRAFT)
1717  struct passwd pwres;
1718  char pwbuf[1024];
1719 #endif
1720  struct passwd *pass = NULL;
1721 
1722  if (text[0] == '\0')
1723  return NULL;
1724 
1725  if (*text == '~')
1726  text++;
1727 
1728  if (state == 0)
1729  setpwent();
1730 
1731  while (
1732 #if defined(HAVE_GETPW_R_POSIX) || defined(HAVE_GETPW_R_DRAFT)
1733  getpwent_r(&pwres, pwbuf, sizeof(pwbuf), &pass) == 0 && pass != NULL
1734 #else
1735  (pass = getpwent()) != NULL
1736 #endif
1737  && text[0] == pass->pw_name[0]
1738  && strcmp(text, pass->pw_name) == 0)
1739  continue;
1740 
1741  if (pass == NULL) {
1742  endpwent();
1743  return NULL;
1744  }
1745  return strdup(pass->pw_name);
1746 }
1747 
1748 
1749 /*
1750  * el-compatible wrapper to send TSTP on ^Z
1751  */
1752 /* ARGSUSED */
1753 static unsigned char
1754 _el_rl_tstp(EditLine *el __attribute__((__unused__)), int ch __attribute__((__unused__)))
1755 {
1756  (void)kill(0, SIGTSTP);
1757  return CC_NORM;
1758 }
1759 
1760 /*
1761  * Display list of strings in columnar format on readline's output stream.
1762  * 'matches' is list of strings, 'len' is number of strings in 'matches',
1763  * 'max' is maximum length of string in 'matches'.
1764  */
1765 void
1766 rl_display_match_list(char **matches, int len, int max)
1767 {
1768 
1769  fn_display_match_list(e, matches, (size_t)len, (size_t)max);
1770 }
1771 
1772 static const char *
1773 /*ARGSUSED*/
1774 _rl_completion_append_character_function(const char *dummy
1775  __attribute__((__unused__)))
1776 {
1777  static char buf[2];
1778  buf[0] = (char)rl_completion_append_character;
1779  buf[1] = '\0';
1780  return buf;
1781 }
1782 
1783 
1784 /*
1785  * complete word at current point
1786  */
1787 /* ARGSUSED */
1788 int
1789 rl_complete(int ignore __attribute__((__unused__)), int invoking_key)
1790 {
1791 #ifdef WIDECHAR
1792  static ct_buffer_t wbreak_conv, sprefix_conv;
1793 #endif
1794 
1795  if (h == NULL || e == NULL)
1796  rl_initialize();
1797 
1798  if (rl_inhibit_completion) {
1799  char arr[2];
1800  arr[0] = (char)invoking_key;
1801  arr[1] = '\0';
1802  el_insertstr(e, arr);
1803  return CC_REFRESH;
1804  }
1805 
1806  /* Just look at how many global variables modify this operation! */
1807  return fn_complete(e,
1808  (CPFunction *)rl_completion_entry_function,
1809  rl_attempted_completion_function,
1810  ct_decode_string(rl_basic_word_break_characters, &wbreak_conv),
1811  ct_decode_string(rl_special_prefixes, &sprefix_conv),
1812  _rl_completion_append_character_function,
1813  (size_t)rl_completion_query_items,
1814  &rl_completion_type, &rl_attempted_completion_over,
1815  &rl_point, &rl_end);
1816 
1817 
1818 }
1819 
1820 
1821 /* ARGSUSED */
1822 static unsigned char
1823 _el_rl_complete(EditLine *el __attribute__((__unused__)), int ch)
1824 {
1825  return (unsigned char)rl_complete(0, ch);
1826 }
1827 
1828 /*
1829  * misc other functions
1830  */
1831 
1832 /*
1833  * bind key c to readline-type function func
1834  */
1835 int
1836 rl_bind_key(int c, rl_command_func_t *func)
1837 {
1838  int retval = -1;
1839 
1840  if (h == NULL || e == NULL)
1841  rl_initialize();
1842 
1843  if (func == rl_insert) {
1844  /* XXX notice there is no range checking of ``c'' */
1845  e->el_map.key[c] = ED_INSERT;
1846  retval = 0;
1847  }
1848  return retval;
1849 }
1850 
1851 
1852 /*
1853  * read one key from input - handles chars pushed back
1854  * to input stream also
1855  */
1856 int
1857 rl_read_key(void)
1858 {
1859  char fooarr[2 * sizeof(int)];
1860 
1861  if (e == NULL || h == NULL)
1862  rl_initialize();
1863 
1864  return el_getc(e, fooarr);
1865 }
1866 
1867 
1868 /*
1869  * reset the terminal
1870  */
1871 /* ARGSUSED */
1872 void
1873 rl_reset_terminal(const char *p __attribute__((__unused__)))
1874 {
1875 
1876  if (h == NULL || e == NULL)
1877  rl_initialize();
1878  el_reset(e);
1879 }
1880 
1881 
1882 /*
1883  * insert character ``c'' back into input stream, ``count'' times
1884  */
1885 int
1886 rl_insert(int count, int c)
1887 {
1888  char arr[2];
1889 
1890  if (h == NULL || e == NULL)
1891  rl_initialize();
1892 
1893  /* XXX - int -> char conversion can lose on multichars */
1894  arr[0] = (char)c;
1895  arr[1] = '\0';
1896 
1897  for (; count > 0; count--)
1898  el_push(e, arr);
1899 
1900  return 0;
1901 }
1902 
1903 int
1904 rl_insert_text(const char *text)
1905 {
1906  if (!text || *text == 0)
1907  return 0;
1908 
1909  if (h == NULL || e == NULL)
1910  rl_initialize();
1911 
1912  if (el_insertstr(e, text) < 0)
1913  return 0;
1914  return (int)strlen(text);
1915 }
1916 
1917 /*ARGSUSED*/
1918 int
1919 rl_newline(int count __attribute__((__unused__)),
1920  int c __attribute__((__unused__)))
1921 {
1922  /*
1923  * Readline-4.0 appears to ignore the args.
1924  */
1925  return rl_insert(1, '\n');
1926 }
1927 
1928 /*ARGSUSED*/
1929 static unsigned char
1930 rl_bind_wrapper(EditLine *el __attribute__((__unused__)), unsigned char c)
1931 {
1932  if (map[c] == NULL)
1933  return CC_ERROR;
1934 
1935  _rl_update_pos();
1936 
1937  (*map[c])(NULL, c);
1938 
1939  /* If rl_done was set by the above call, deal with it here */
1940  if (rl_done)
1941  return CC_EOF;
1942 
1943  return CC_NORM;
1944 }
1945 
1946 int
1947 rl_add_defun(const char *name, Function *fun, int c)
1948 {
1949  char dest[8];
1950  if ((size_t)c >= sizeof(map) / sizeof(map[0]) || c < 0)
1951  return -1;
1952  map[(unsigned char)c] = fun;
1953  el_set(e, EL_ADDFN, name, name, rl_bind_wrapper);
1954  vis(dest, c, VIS_WHITE|VIS_NOSLASH, 0);
1955  el_set(e, EL_BIND, dest, name);
1956  return 0;
1957 }
1958 
1959 void
1960 rl_callback_read_char()
1961 {
1962  int count = 0, done = 0;
1963  const char *buf = el_gets(e, &count);
1964  char *wbuf;
1965 
1966  if (buf == NULL || count-- <= 0)
1967  return;
1968  if (count == 0 && buf[0] == e->el_tty.t_c[TS_IO][C_EOF])
1969  done = 1;
1970  if (buf[count] == '\n' || buf[count] == '\r')
1971  done = 2;
1972 
1973  if (done && rl_linefunc != NULL) {
1974  el_set(e, EL_UNBUFFERED, 0);
1975  if (done == 2) {
1976  if ((wbuf = strdup(buf)) != NULL)
1977  wbuf[count] = '\0';
1978  } else
1979  wbuf = NULL;
1980  (*(void (*)(const char *))rl_linefunc)(wbuf);
1981  /*el_set(e, EL_UNBUFFERED, 1);*/
1982  }
1983 }
1984 
1985 void
1986 rl_callback_handler_install(const char *prompt, VCPFunction *linefunc)
1987 {
1988  if (e == NULL) {
1989  rl_initialize();
1990  }
1991  (void)rl_set_prompt(prompt);
1992  rl_linefunc = linefunc;
1993  el_set(e, EL_UNBUFFERED, 1);
1994 }
1995 
1996 void
1997 rl_callback_handler_remove(void)
1998 {
1999  el_set(e, EL_UNBUFFERED, 0);
2000  rl_linefunc = NULL;
2001 }
2002 
2003 void
2004 rl_redisplay(void)
2005 {
2006  char a[2];
2007  a[0] = (char)e->el_tty.t_c[TS_IO][C_REPRINT];
2008  a[1] = '\0';
2009  el_push(e, a);
2010 }
2011 
2012 int
2013 rl_get_previous_history(int count, int key)
2014 {
2015  char a[2];
2016  a[0] = (char)key;
2017  a[1] = '\0';
2018  while (count--)
2019  el_push(e, a);
2020  return 0;
2021 }
2022 
2023 void
2024 /*ARGSUSED*/
2025 rl_prep_terminal(int meta_flag __attribute__((__unused__)))
2026 {
2027  el_set(e, EL_PREP_TERM, 1);
2028 }
2029 
2030 void
2031 rl_deprep_terminal(void)
2032 {
2033  el_set(e, EL_PREP_TERM, 0);
2034 }
2035 
2036 int
2037 rl_read_init_file(const char *s)
2038 {
2039  return el_source(e, s);
2040 }
2041 
2042 int
2043 rl_parse_and_bind(const char *line)
2044 {
2045  const char **argv;
2046  int argc;
2047  Tokenizer *tok;
2048 
2049  tok = tok_init(NULL);
2050  tok_str(tok, line, &argc, &argv);
2051  argc = el_parse(e, argc, argv);
2052  tok_end(tok);
2053  return argc ? 1 : 0;
2054 }
2055 
2056 int
2057 rl_variable_bind(const char *var, const char *value)
2058 {
2059  /*
2060  * The proper return value is undocument, but this is what the
2061  * readline source seems to do.
2062  */
2063  return el_set(e, EL_BIND, "", var, value) == -1 ? 1 : 0;
2064 }
2065 
2066 void
2067 rl_stuff_char(int c)
2068 {
2069  char buf[2];
2070 
2071  buf[0] = (char)c;
2072  buf[1] = '\0';
2073  el_insertstr(e, buf);
2074 }
2075 
2076 static int
2077 _rl_event_read_char(EditLine *el, char *cp)
2078 {
2079  int n;
2080  ssize_t num_read = 0;
2081 
2082  *cp = '\0';
2083  while (rl_event_hook) {
2084 
2085  (*rl_event_hook)();
2086 
2087 #if defined(FIONREAD)
2088  if (ioctl(el->el_infd, FIONREAD, &n) < 0)
2089  return -1;
2090  if (n)
2091  num_read = read(el->el_infd, cp, (size_t)1);
2092  else
2093  num_read = 0;
2094 #elif defined(F_SETFL) && defined(O_NDELAY)
2095  if ((n = fcntl(el->el_infd, F_GETFL, 0)) < 0)
2096  return -1;
2097  if (fcntl(el->el_infd, F_SETFL, n|O_NDELAY) < 0)
2098  return -1;
2099  num_read = read(el->el_infd, cp, 1);
2100  if (fcntl(el->el_infd, F_SETFL, n))
2101  return -1;
2102 #else
2103  /* not non-blocking, but what you gonna do? */
2104  num_read = read(el->el_infd, cp, 1);
2105  return -1;
2106 #endif
2107 
2108  if (num_read < 0 && errno == EAGAIN)
2109  continue;
2110  if (num_read == 0)
2111  continue;
2112  break;
2113  }
2114  if (!rl_event_hook)
2115  el_set(el, EL_GETCFN, EL_BUILTIN_GETCFN);
2116  return (int)num_read;
2117 }
2118 
2119 static void
2120 _rl_update_pos(void)
2121 {
2122  const LineInfo *li = el_line(e);
2123 
2124  rl_point = (int)(li->cursor - li->buffer);
2125  rl_end = (int)(li->lastchar - li->buffer);
2126 }
2127 
2128 void
2129 rl_get_screen_size(int *rows, int *cols)
2130 {
2131  if (rows)
2132  el_get(e, EL_GETTC, "li", rows);
2133  if (cols)
2134  el_get(e, EL_GETTC, "co", cols);
2135 }
2136 
2137 void
2138 rl_set_screen_size(int rows, int cols)
2139 {
2140  char buf[64];
2141  (void)snprintf(buf, sizeof(buf), "%d", rows);
2142  el_set(e, EL_SETTC, "li", buf);
2143  (void)snprintf(buf, sizeof(buf), "%d", cols);
2144  el_set(e, EL_SETTC, "co", buf);
2145 }
2146 
2147 char **
2148 rl_completion_matches(const char *str, rl_compentry_func_t *fun)
2149 {
2150  size_t len, max, i, j, min;
2151  char **list, *match, *a, *b;
2152 
2153  len = 1;
2154  max = 10;
2155  if ((list = el_malloc(max * sizeof(*list))) == NULL)
2156  return NULL;
2157 
2158  while ((match = (*fun)(str, (int)(len - 1))) != NULL) {
2159  list[len++] = match;
2160  if (len == max) {
2161  char **nl;
2162  max += 10;
2163  if ((nl = el_realloc(list, max * sizeof(*nl))) == NULL)
2164  goto out;
2165  list = nl;
2166  }
2167  }
2168  if (len == 1)
2169  goto out;
2170  list[len] = NULL;
2171  if (len == 2) {
2172  if ((list[0] = strdup(list[1])) == NULL)
2173  goto out;
2174  return list;
2175  }
2176  qsort(&list[1], len - 1, sizeof(*list),
2177  (int (*)(const void *, const void *)) strcmp);
2178  min = SIZE_T_MAX;
2179  for (i = 1, a = list[i]; i < len - 1; i++, a = b) {
2180  b = list[i + 1];
2181  for (j = 0; a[j] && a[j] == b[j]; j++)
2182  continue;
2183  if (min > j)
2184  min = j;
2185  }
2186  if (min == 0 && *str) {
2187  if ((list[0] = strdup(str)) == NULL)
2188  goto out;
2189  } else {
2190  if ((list[0] = el_malloc((min + 1) * sizeof(*list[0]))) == NULL)
2191  goto out;
2192  (void)memcpy(list[0], list[1], min);
2193  list[0][min] = '\0';
2194  }
2195  return list;
2196 
2197 out:
2198  el_free(list);
2199  return NULL;
2200 }
2201 
2202 char *
2203 rl_filename_completion_function (const char *text, int state)
2204 {
2205  return fn_filename_completion_function(text, state);
2206 }
2207 
2208 void
2209 rl_forced_update_display(void)
2210 {
2211  el_set(e, EL_REFRESH);
2212 }
2213 
2214 int
2215 _rl_abort_internal(void)
2216 {
2217  el_beep(e);
2218  longjmp(topbuf, 1);
2219  /*NOTREACHED*/
2220 }
2221 
2222 int
2223 _rl_qsort_string_compare(char **s1, char **s2)
2224 {
2225  return strcoll(*s1, *s2);
2226 }
2227 
2228 HISTORY_STATE *
2229 history_get_history_state(void)
2230 {
2231  HISTORY_STATE *hs;
2232 
2233  if ((hs = el_malloc(sizeof(*hs))) == NULL)
2234  return NULL;
2235  hs->length = history_length;
2236  return hs;
2237 }
2238 
2239 int
2240 /*ARGSUSED*/
2241 rl_kill_text(int from __attribute__((__unused__)),
2242  int to __attribute__((__unused__)))
2243 {
2244  return 0;
2245 }
2246 
2247 Keymap
2248 rl_make_bare_keymap(void)
2249 {
2250  return NULL;
2251 }
2252 
2253 Keymap
2254 rl_get_keymap(void)
2255 {
2256  return NULL;
2257 }
2258 
2259 void
2260 /*ARGSUSED*/
2261 rl_set_keymap(Keymap k __attribute__((__unused__)))
2262 {
2263 }
2264 
2265 int
2266 /*ARGSUSED*/
2267 rl_generic_bind(int type __attribute__((__unused__)),
2268  const char * keyseq __attribute__((__unused__)),
2269  const char * data __attribute__((__unused__)),
2270  Keymap k __attribute__((__unused__)))
2271 {
2272  return 0;
2273 }
2274 
2275 int
2276 /*ARGSUSED*/
2277 rl_bind_key_in_map(int key __attribute__((__unused__)),
2278  rl_command_func_t *fun __attribute__((__unused__)),
2279  Keymap k __attribute__((__unused__)))
2280 {
2281  return 0;
2282 }
2283 
2284 /* unsupported, but needed by python */
2285 void
2286 rl_cleanup_after_signal(void)
2287 {
2288 }
2289 
2290 int
2291 rl_on_new_line(void)
2292 {
2293  return 0;
2294 }