readline/util.c

   1 /* util.c -- readline utility functions */
   2
   3 /* Copyright (C) 1987-2010 Free Software Foundation, Inc.
   4
   5    This file is part of the GNU Readline Library (Readline), a library
   6    for reading lines of text with interactive input and history editing.
   7
   8    Readline is free software: you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation, either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    Readline is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with Readline.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #define READLINE_LIBRARY
  23
  24 #if defined (HAVE_CONFIG_H)
  25 #  include <config.h>
  26 #endif
  27
  28 #include <sys/types.h>
  29 #include <fcntl.h>
  30 #include "posixjmp.h"
  31
  32 #if defined (HAVE_UNISTD_H)
  33 #  include <unistd.h>           /* for _POSIX_VERSION */
  34 #endif /* HAVE_UNISTD_H */
  35
  36 #if defined (HAVE_STDLIB_H)
  37 #  include <stdlib.h>
  38 #else
  39 #  include "ansi_stdlib.h"
  40 #endif /* HAVE_STDLIB_H */
  41
  42 #include <stdio.h>
  43 #include <ctype.h>
  44
  45 /* System-specific feature definitions and include files. */
  46 #include "rldefs.h"
  47 #include "rlmbutil.h"
  48
  49 #if defined (TIOCSTAT_IN_SYS_IOCTL)
  50 #  include <sys/ioctl.h>
  51 #endif /* TIOCSTAT_IN_SYS_IOCTL */
  52
  53 /* Some standard library routines. */
  54 #include "readline.h"
  55
  56 #include "rlprivate.h"
  57 #include "xmalloc.h"
  58
  59 /* **************************************************************** */
  60 /*                                                                  */
  61 /*                      Utility Functions                           */
  62 /*                                                                  */
  63 /* **************************************************************** */
  64
  65 /* Return 0 if C is not a member of the class of characters that belong
  66    in words, or 1 if it is. */
  67
  68 int _rl_allow_pathname_alphabetic_chars = 0;
  69 static const char * const pathname_alphabetic_chars = "/-_=~.#$";
  70
  71 int
  72 rl_alphabetic (c)
  73      int c;
  74 {
  75   if (ALPHABETIC (c))
  76     return (1);
  77
  78   return (_rl_allow_pathname_alphabetic_chars &&
  79             strchr (pathname_alphabetic_chars, c) != NULL);
  80 }
  81
  82 #if defined (HANDLE_MULTIBYTE)
  83 int
  84 _rl_walphabetic (wchar_t wc)
  85 {
  86   int c;
  87
  88   if (iswalnum (wc))
  89     return (1);
  90
  91   c = wc & 0177;
  92   return (_rl_allow_pathname_alphabetic_chars &&
  93             strchr (pathname_alphabetic_chars, c) != NULL);
  94 }
  95 #endif
  96
  97 /* How to abort things. */
  98 int
  99 _rl_abort_internal ()
 100 {
 101   rl_ding ();
 102   rl_clear_message ();
 103   _rl_reset_argument ();
 104   rl_clear_pending_input ();
 105
 106   RL_UNSETSTATE (RL_STATE_MACRODEF);
 107   while (rl_executing_macro)
 108     _rl_pop_executing_macro ();
 109
 110   rl_last_func = (rl_command_func_t *)NULL;
 111   longjmp (_rl_top_level, 1);
 112   return (0);
 113 }
 114
 115 int
 116 rl_abort (count, key)
 117      int count, key;
 118 {
 119   return (_rl_abort_internal ());
 120 }
 121
 122 int
 123 _rl_null_function (count, key)
 124      int count, key;
 125 {
 126   return 0;
 127 }
 128
 129 int
 130 rl_tty_status (count, key)
 131      int count, key;
 132 {
 133 #if defined (TIOCSTAT)
 134   ioctl (1, TIOCSTAT, (char *)0);
 135   rl_refresh_line (count, key);
 136 #else
 137   rl_ding ();
 138 #endif
 139   return 0;
 140 }
 141
 142 /* Return a copy of the string between FROM and TO.
 143    FROM is inclusive, TO is not. */
 144 char *
 145 rl_copy_text (from, to)
 146      int from, to;
 147 {
 148   register int length;
 149   char *copy;
 150
 151   /* Fix it if the caller is confused. */
 152   if (from > to)
 153     SWAP (from, to);
 154
 155   length = to - from;
 156   copy = (char *)xmalloc (1 + length);
 157   strncpy (copy, rl_line_buffer + from, length);
 158   copy[length] = '\0';
 159   return (copy);
 160 }
 161
 162 /* Increase the size of RL_LINE_BUFFER until it has enough space to hold
 163    LEN characters. */
 164 void
 165 rl_extend_line_buffer (len)
 166      int len;
 167 {
 168   while (len >= rl_line_buffer_len)
 169     {
 170       rl_line_buffer_len += DEFAULT_BUFFER_SIZE;
 171       rl_line_buffer = (char *)xrealloc (rl_line_buffer, rl_line_buffer_len);
 172     }
 173
 174   _rl_set_the_line ();
 175 }
 176
 177
 178 /* A function for simple tilde expansion. */
 179 int
 180 rl_tilde_expand (ignore, key)
 181      int ignore, key;
 182 {
 183   register int start, end;
 184   char *homedir, *temp;
 185   int len;
 186
 187   end = rl_point;
 188   start = end - 1;
 189
 190   if (rl_point == rl_end && rl_line_buffer[rl_point] == '~')
 191     {
 192       homedir = tilde_expand ("~");
 193       _rl_replace_text (homedir, start, end);
 194       xfree (homedir);
 195       return (0);
 196     }
 197   else if (rl_line_buffer[start] != '~')
 198     {
 199       for (; !whitespace (rl_line_buffer[start]) && start >= 0; start--)
 200         ;
 201       start++;
 202     }
 203
 204   end = start;
 205   do
 206     end++;
 207   while (whitespace (rl_line_buffer[end]) == 0 && end < rl_end);
 208
 209   if (whitespace (rl_line_buffer[end]) || end >= rl_end)
 210     end--;
 211
 212   /* If the first character of the current word is a tilde, perform
 213      tilde expansion and insert the result.  If not a tilde, do
 214      nothing. */
 215   if (rl_line_buffer[start] == '~')
 216     {
 217       len = end - start + 1;
 218       temp = (char *)xmalloc (len + 1);
 219       strncpy (temp, rl_line_buffer + start, len);
 220       temp[len] = '\0';
 221       homedir = tilde_expand (temp);
 222       xfree (temp);
 223
 224       _rl_replace_text (homedir, start, end);
 225       xfree (homedir);
 226     }
 227
 228   return (0);
 229 }
 230
 231 #if defined (USE_VARARGS)
 232 void
 233 #if defined (PREFER_STDARG)
 234 _rl_ttymsg (const char *format, ...)
 235 #else
 236 _rl_ttymsg (va_alist)
 237      va_dcl
 238 #endif
 239 {
 240   va_list args;
 241 #if defined (PREFER_VARARGS)
 242   char *format;
 243 #endif
 244
 245 #if defined (PREFER_STDARG)
 246   va_start (args, format);
 247 #else
 248   va_start (args);
 249   format = va_arg (args, char *);
 250 #endif
 251
 252   fprintf (stderr, "readline: ");
 253   vfprintf (stderr, format, args);
 254   fprintf (stderr, "\n");
 255   fflush (stderr);
 256
 257   va_end (args);
 258
 259   rl_forced_update_display ();
 260 }
 261
 262 void
 263 #if defined (PREFER_STDARG)
 264 _rl_errmsg (const char *format, ...)
 265 #else
 266 _rl_errmsg (va_alist)
 267      va_dcl
 268 #endif
 269 {
 270   va_list args;
 271 #if defined (PREFER_VARARGS)
 272   char *format;
 273 #endif
 274
 275 #if defined (PREFER_STDARG)
 276   va_start (args, format);
 277 #else
 278   va_start (args);
 279   format = va_arg (args, char *);
 280 #endif
 281
 282   fprintf (stderr, "readline: ");
 283   vfprintf (stderr, format, args);
 284   fprintf (stderr, "\n");
 285   fflush (stderr);
 286
 287   va_end (args);
 288 }
 289
 290 #else /* !USE_VARARGS */
 291 void
 292 _rl_ttymsg (format, arg1, arg2)
 293      char *format;
 294 {
 295   fprintf (stderr, "readline: ");
 296   fprintf (stderr, format, arg1, arg2);
 297   fprintf (stderr, "\n");
 298
 299   rl_forced_update_display ();
 300 }
 301
 302 void
 303 _rl_errmsg (format, arg1, arg2)
 304      char *format;
 305 {
 306   fprintf (stderr, "readline: ");
 307   fprintf (stderr, format, arg1, arg2);
 308   fprintf (stderr, "\n");
 309 }
 310 #endif /* !USE_VARARGS */
 311
 312 /* **************************************************************** */
 313 /*                                                                  */
 314 /*                      String Utility Functions                    */
 315 /*                                                                  */
 316 /* **************************************************************** */
 317
 318 /* Determine if s2 occurs in s1.  If so, return a pointer to the
 319    match in s1.  The compare is case insensitive. */
 320 char *
 321 _rl_strindex (s1, s2)
 322      register const char *s1, *s2;
 323 {
 324   register int i, l, len;
 325
 326   for (i = 0, l = strlen (s2), len = strlen (s1); (len - i) >= l; i++)
 327     if (_rl_strnicmp (s1 + i, s2, l) == 0)
 328       return ((char *) (s1 + i));
 329   return ((char *)NULL);
 330 }
 331
 332 #ifndef HAVE_STRPBRK
 333 /* Find the first occurrence in STRING1 of any character from STRING2.
 334    Return a pointer to the character in STRING1. */
 335 char *
 336 _rl_strpbrk (string1, string2)
 337      const char *string1, *string2;
 338 {
 339   register const char *scan;
 340 #if defined (HANDLE_MULTIBYTE)
 341   mbstate_t ps;
 342   register int i, v;
 343
 344   memset (&ps, 0, sizeof (mbstate_t));
 345 #endif
 346
 347   for (; *string1; string1++)
 348     {
 349       for (scan = string2; *scan; scan++)
 350         {
 351           if (*string1 == *scan)
 352             return ((char *)string1);
 353         }
 354 #if defined (HANDLE_MULTIBYTE)
 355       if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
 356         {
 357           v = _rl_get_char_len (string1, &ps);
 358           if (v > 1)
 359             string1 += v - 1;   /* -1 to account for auto-increment in loop */
 360         }
 361 #endif
 362     }
 363   return ((char *)NULL);
 364 }
 365 #endif
 366
 367 #if !defined (HAVE_STRCASECMP)
 368 /* Compare at most COUNT characters from string1 to string2.  Case
 369    doesn't matter (strncasecmp). */
 370 int
 371 _rl_strnicmp (string1, string2, count)
 372      char *string1, *string2;
 373      int count;
 374 {
 375   register char *s1, *s2;
 376   int d;
 377
 378   if (count <= 0 || (string1 == string2))
 379     return 0;
 380
 381   s1 = string1;
 382   s2 = string2;
 383   do
 384     {
 385       d = _rl_to_lower (*s1) - _rl_to_lower (*s2);      /* XXX - cast to unsigned char? */
 386       if (d != 0)
 387         return d;
 388       if (*s1++ == '\0')
 389         break;
 390       s2++;
 391     }
 392   while (--count != 0)
 393
 394   return (0);
 395 }
 396
 397 /* strcmp (), but caseless (strcasecmp). */
 398 int
 399 _rl_stricmp (string1, string2)
 400      char *string1, *string2;
 401 {
 402   register char *s1, *s2;
 403   int d;
 404
 405   s1 = string1;
 406   s2 = string2;
 407
 408   if (s1 == s2)
 409     return 0;
 410
 411   while ((d = _rl_to_lower (*s1) - _rl_to_lower (*s2)) == 0)
 412     {
 413       if (*s1++ == '\0')
 414         return 0;
 415       s2++;
 416     }
 417
 418   return (d);
 419 }
 420 #endif /* !HAVE_STRCASECMP */
 421
 422 /* Stupid comparison routine for qsort () ing strings. */
 423 int
 424 _rl_qsort_string_compare (s1, s2)
 425   char **s1, **s2;
 426 {
 427 #if defined (HAVE_STRCOLL)
 428   return (strcoll (*s1, *s2));
 429 #else
 430   int result;
 431
 432   result = **s1 - **s2;
 433   if (result == 0)
 434     result = strcmp (*s1, *s2);
 435
 436   return result;
 437 #endif
 438 }
 439
 440 /* Function equivalents for the macros defined in chardefs.h. */
 441 #define FUNCTION_FOR_MACRO(f)   int (f) (c) int c; { return f (c); }
 442
 443 FUNCTION_FOR_MACRO (_rl_digit_p)
 444 FUNCTION_FOR_MACRO (_rl_digit_value)
 445 FUNCTION_FOR_MACRO (_rl_lowercase_p)
 446 FUNCTION_FOR_MACRO (_rl_pure_alphabetic)
 447 FUNCTION_FOR_MACRO (_rl_to_lower)
 448 FUNCTION_FOR_MACRO (_rl_to_upper)
 449 FUNCTION_FOR_MACRO (_rl_uppercase_p)
 450
 451 /* A convenience function, to force memory deallocation to be performed
 452    by readline.  DLLs on Windows apparently require this. */
 453 void
 454 rl_free (mem)
 455      void *mem;
 456 {
 457   if (mem)
 458     free (mem);
 459 }
 460
 461 /* Backwards compatibility, now that savestring has been removed from
 462    all `public' readline header files. */
 463 #undef _rl_savestring
 464 char *
 465 _rl_savestring (s)
 466      const char *s;
 467 {
 468   return (strcpy ((char *)xmalloc (1 + (int)strlen (s)), (s)));
 469 }
 470
 471 #if defined (USE_VARARGS)
 472 static FILE *_rl_tracefp;
 473
 474 void
 475 #if defined (PREFER_STDARG)
 476 _rl_trace (const char *format, ...)
 477 #else
 478 _rl_trace (va_alist)
 479      va_dcl
 480 #endif
 481 {
 482   va_list args;
 483 #if defined (PREFER_VARARGS)
 484   char *format;
 485 #endif
 486
 487 #if defined (PREFER_STDARG)
 488   va_start (args, format);
 489 #else
 490   va_start (args);
 491   format = va_arg (args, char *);
 492 #endif
 493
 494   if (_rl_tracefp == 0)
 495     _rl_tropen ();
 496   vfprintf (_rl_tracefp, format, args);
 497   fprintf (_rl_tracefp, "\n");
 498   fflush (_rl_tracefp);
 499
 500   va_end (args);
 501 }
 502
 503 int
 504 _rl_tropen ()
 505 {
 506   char fnbuf[128];
 507
 508   if (_rl_tracefp)
 509     fclose (_rl_tracefp);
 510   sprintf (fnbuf, "/var/tmp/rltrace.%ld", getpid());
 511   unlink(fnbuf);
 512   _rl_tracefp = fopen (fnbuf, "w+");
 513   return _rl_tracefp != 0;
 514 }
 515
 516 int
 517 _rl_trclose ()
 518 {
 519   int r;
 520
 521   r = fclose (_rl_tracefp);
 522   _rl_tracefp = 0;
 523   return r;
 524 }
 525
 526 #endif