1. Steve Losh
  2. hg-review-mutt-test

Source

hg-review-mutt-test / lib.c

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
/*
 * Copyright (C) 1996-2000 Michael R. Elkins <me@mutt.org>
 * Copyright (C) 1999-2000 Thomas Roessler <roessler@does-not-exist.org>
 * 
 *     This program is free software; you can redistribute it
 *     and/or modify it under the terms of the GNU General Public
 *     License as published by the Free Software Foundation; either
 *     version 2 of the License, or (at your option) any later
 *     version.
 * 
 *     This program is distributed in the hope that it will be
 *     useful, but WITHOUT ANY WARRANTY; without even the implied
 *     warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 *     PURPOSE.  See the GNU General Public License for more
 *     details.
 * 
 *     You should have received a copy of the GNU General Public
 *     License along with this program; if not, write to the Free
 *     Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 *     Boston, MA  02110-1301, USA.
 */ 

/*
 * This file used to contain some more functions, namely those
 * which are now in muttlib.c.  They have been removed, so we have
 * some of our "standard" functions in external programs, too.
 */

#define _LIB_C 1

#if HAVE_CONFIG_H
# include "config.h"
#endif

#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <errno.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <pwd.h>

#ifdef HAVE_SYSEXITS_H
#include <sysexits.h>
#else /* Make sure EX_OK is defined <philiph@pobox.com> */
#define EX_OK 0
#endif

#include "lib.h"


static struct sysexits
{
  int v;
  const char *str;
} 
sysexits_h[] = 
{
#ifdef EX_USAGE
  { 0xff & EX_USAGE, "Bad usage." },
#endif
#ifdef EX_DATAERR
  { 0xff & EX_DATAERR, "Data format error." },
#endif
#ifdef EX_NOINPUT
  { 0xff & EX_NOINPUT, "Cannot open input." },
#endif
#ifdef EX_NOUSER
  { 0xff & EX_NOUSER, "User unknown." },
#endif
#ifdef EX_NOHOST
  { 0xff & EX_NOHOST, "Host unknown." },
#endif
#ifdef EX_UNAVAILABLE
  { 0xff & EX_UNAVAILABLE, "Service unavailable." },
#endif
#ifdef EX_SOFTWARE
  { 0xff & EX_SOFTWARE, "Internal error." },
#endif
#ifdef EX_OSERR
  { 0xff & EX_OSERR, "Operating system error." },
#endif
#ifdef EX_OSFILE
  { 0xff & EX_OSFILE, "System file missing." },
#endif
#ifdef EX_CANTCREAT
  { 0xff & EX_CANTCREAT, "Can't create output." },
#endif
#ifdef EX_IOERR
  { 0xff & EX_IOERR, "I/O error." },
#endif
#ifdef EX_TEMPFAIL
  { 0xff & EX_TEMPFAIL, "Deferred." },
#endif
#ifdef EX_PROTOCOL
  { 0xff & EX_PROTOCOL, "Remote protocol error." },
#endif
#ifdef EX_NOPERM
  { 0xff & EX_NOPERM, "Insufficient permission." },
#endif
#ifdef EX_CONFIG
  { 0xff & EX_NOPERM, "Local configuration error." },
#endif
  { S_ERR, "Exec error." },
  { -1, NULL}
};

void mutt_nocurses_error (const char *fmt, ...)
{
  va_list ap;

  va_start (ap, fmt);
  vfprintf (stderr, fmt, ap);
  va_end (ap);
  fputc ('\n', stderr);
}

void *safe_calloc (size_t nmemb, size_t size)
{
  void *p;

  if (!nmemb || !size)
    return NULL;

  if (((size_t) -1) / nmemb <= size)
  {
    mutt_error _("Integer overflow -- can't allocate memory!");
    sleep (1);
    mutt_exit (1);
  }
  
  if (!(p = calloc (nmemb, size)))
  {
    mutt_error _("Out of memory!");
    sleep (1);
    mutt_exit (1);
  }
  return p;
}

void *safe_malloc (size_t siz)
{
  void *p;

  if (siz == 0)
    return 0;
  if ((p = (void *) malloc (siz)) == 0)	/* __MEM_CHECKED__ */
  {
    mutt_error _("Out of memory!");
    sleep (1);
    mutt_exit (1);
  }
  return (p);
}

void safe_realloc (void *ptr, size_t siz)
{
  void *r;
  void **p = (void **)ptr;

  if (siz == 0)
  {
    if (*p)
    {
      free (*p);			/* __MEM_CHECKED__ */
      *p = NULL;
    }
    return;
  }

  if (*p)
    r = (void *) realloc (*p, siz);	/* __MEM_CHECKED__ */
  else
  {
    /* realloc(NULL, nbytes) doesn't seem to work under SunOS 4.1.x  --- __MEM_CHECKED__ */
    r = (void *) malloc (siz);		/* __MEM_CHECKED__ */
  }

  if (!r)
  {
    mutt_error _("Out of memory!");
    sleep (1);
    mutt_exit (1);
  }

  *p = r;
}

void safe_free (void *ptr)	/* __SAFE_FREE_CHECKED__ */
{
  void **p = (void **)ptr;
  if (*p)
  {
    free (*p);				/* __MEM_CHECKED__ */
    *p = 0;
  }
}

int safe_fclose (FILE **f)
{
  int r = 0;
  
  if (*f)
    r = fclose (*f);
      
  *f = NULL;
  return r;
}

char *safe_strdup (const char *s)
{
  char *p;
  size_t l;

  if (!s || !*s)
    return 0;
  l = strlen (s) + 1;
  p = (char *)safe_malloc (l);
  memcpy (p, s, l);
  return (p);
}

char *safe_strcat (char *d, size_t l, const char *s)
{
  char *p = d;

  if (!l) 
    return d;

  l--; /* Space for the trailing '\0'. */
  
  for (; *d && l; l--)
    d++;
  for (; *s && l; l--)
    *d++ = *s++;

  *d = '\0';
  
  return p;
}

char *safe_strncat (char *d, size_t l, const char *s, size_t sl)
{
  char *p = d;

  if (!l)
    return d;
  
  l--; /* Space for the trailing '\0'. */
  
  for (; *d && l; l--)
    d++;
  for (; *s && l && sl; l--, sl--)
    *d++ = *s++;

  *d = '\0';
  
  return p;
}


void mutt_str_replace (char **p, const char *s)
{
  FREE (p);		/* __FREE_CHECKED__ */
  *p = safe_strdup (s);
}

void mutt_str_adjust (char **p)
{
  if (!p || !*p) return;
  safe_realloc (p, strlen (*p) + 1);
}

/* convert all characters in the string to lowercase */
char *mutt_strlower (char *s)
{
  char *p = s;

  while (*p)
  {
    *p = tolower ((unsigned char) *p);
    p++;
  }

  return (s);
}

void mutt_unlink (const char *s)
{
  int fd;
  int flags;
  FILE *f;
  struct stat sb, sb2;
  char buf[2048];

  /* Defend against symlink attacks */
  
#ifdef O_NOFOLLOW 
  flags = O_RDWR | O_NOFOLLOW;
#else
  flags = O_RDWR;
#endif
  
  if (lstat (s, &sb) == 0 && S_ISREG(sb.st_mode))
  {
    if ((fd = open (s, flags)) < 0)
      return;
    
    if ((fstat (fd, &sb2) != 0) || !S_ISREG (sb2.st_mode) 
	|| (sb.st_dev != sb2.st_dev) || (sb.st_ino != sb2.st_ino))
    {
      close (fd);
      return;
    }
    
    if ((f = fdopen (fd, "r+")))
    {
      unlink (s);
      memset (buf, 0, sizeof (buf));
      while (sb.st_size > 0)
      {
	fwrite (buf, 1, MIN (sizeof (buf), sb.st_size), f);
	sb.st_size -= MIN (sizeof (buf), sb.st_size);
      }
      fclose (f);
    }
  }
}

int mutt_copy_bytes (FILE *in, FILE *out, size_t size)
{
  char buf[2048];
  size_t chunk;

  while (size > 0)
  {
    chunk = (size > sizeof (buf)) ? sizeof (buf) : size;
    if ((chunk = fread (buf, 1, chunk, in)) < 1)
      break;
    if (fwrite (buf, 1, chunk, out) != chunk)
    {
      /* dprint (1, (debugfile, "mutt_copy_bytes(): fwrite() returned short byte count\n")); */
      return (-1);
    }
    size -= chunk;
  }

  return 0;
}

int mutt_copy_stream (FILE *fin, FILE *fout)
{
  size_t l;
  char buf[LONG_STRING];

  while ((l = fread (buf, 1, sizeof (buf), fin)) > 0)
  {
    if (fwrite (buf, 1, l, fout) != l)
      return (-1);
  }

  return 0;
}

int 
compare_stat (struct stat *osb, struct stat *nsb)
{
  if (osb->st_dev != nsb->st_dev || osb->st_ino != nsb->st_ino ||
      osb->st_rdev != nsb->st_rdev)
  {
    return -1;
  }

  return 0;
}

int safe_symlink(const char *oldpath, const char *newpath)
{
  struct stat osb, nsb;

  if(!oldpath || !newpath)
    return -1;
  
  if(unlink(newpath) == -1 && errno != ENOENT)
    return -1;
  
  if (oldpath[0] == '/')
  {
    if (symlink (oldpath, newpath) == -1)
      return -1;
  }
  else
  {
    char abs_oldpath[_POSIX_PATH_MAX];

    if ((getcwd (abs_oldpath, sizeof abs_oldpath) == NULL) ||
	(strlen (abs_oldpath) + 1 + strlen (oldpath) + 1 > sizeof abs_oldpath))
    return -1;
  
    strcat (abs_oldpath, "/");		/* __STRCAT_CHECKED__ */
    strcat (abs_oldpath, oldpath);	/* __STRCAT_CHECKED__ */
    if (symlink (abs_oldpath, newpath) == -1)
      return -1;
  }

  if(stat(oldpath, &osb) == -1 || stat(newpath, &nsb) == -1
     || compare_stat(&osb, &nsb) == -1)
  {
    unlink(newpath);
    return -1;
  }
  
  return 0;
}



/* 
 * This function is supposed to do nfs-safe renaming of files.
 * 
 * Warning: We don't check whether src and target are equal.
 */

int safe_rename (const char *src, const char *target)
{
  struct stat ssb, tsb;

  if (!src || !target)
    return -1;

  if (link (src, target) != 0)
  {

    /*
     * Coda does not allow cross-directory links, but tells
     * us it's a cross-filesystem linking attempt.
     * 
     * However, the Coda rename call is allegedly safe to use.
     * 
     * With other file systems, rename should just fail when 
     * the files reside on different file systems, so it's safe
     * to try it here.
     *
     */
    
    dprint (1, (debugfile, "safe_rename: link (%s, %s) failed: %s (%d)\n", src, target, strerror (errno), errno));

    if (errno == EXDEV)
    {
      dprint (1, (debugfile, "safe_rename: errno was EXDEV; trying rename...\n"));
      if (rename (src, target) == -1) 
      {
	dprint (1, (debugfile, "safe_rename: rename (%s, %s) failed: %s (%d)\n", src, target, strerror (errno), errno));
	return -1;
      }
      dprint (1, (debugfile, "safe_rename: rename succeeded.\n"));
    
      return 0;
    }

    return -1;
  }

  /*
   * Stat both links and check if they are equal.
   */
  
  if (lstat (src, &ssb) == -1)
  {
    dprint (1, (debugfile, "safe_rename: can't stat %s: %s (%d)\n",
		src, strerror (errno), errno));
    return -1;
  }
  
  if (lstat (target, &tsb) == -1)
  {
    dprint (1, (debugfile, "safe_rename: can't stat %s: %s (%d)\n",
		src, strerror (errno), errno));
    return -1;
  }

  /* 
   * pretend that the link failed because the target file
   * did already exist.
   */

  if (compare_stat (&ssb, &tsb) == -1)
  {
    dprint (1, (debugfile, "safe_rename: stat blocks for %s and %s diverge; pretending EEXIST.\n", src, target));
    errno = EEXIST;
    return -1;
  }

  /*
   * Unlink the original link.  Should we really ignore the return
   * value here? XXX
   */

  if (unlink (src) == -1) 
  {
    dprint (1, (debugfile, "safe_rename: unlink (%s) failed: %s (%d)\n",
		src, strerror (errno), errno));
  }
  

  return 0;
}


/* Create a temporary directory next to a file name */

int mutt_mkwrapdir (const char *path, char *newfile, size_t nflen, 
		    char *newdir, size_t ndlen)
{
  const char *basename;
  char parent[_POSIX_PATH_MAX];
  char *p;
  int rv;

  strfcpy (parent, NONULL (path), sizeof (parent));
  
  if ((p = strrchr (parent, '/')))
  {
    *p = '\0';
    basename = p + 1;
  }
  else
  {
    strfcpy (parent, ".", sizeof (parent));
    basename = path;
  }

  do 
  {
    snprintf (newdir, ndlen, "%s/%s", parent, ".muttXXXXXX");
    mktemp (newdir);
  } 
  while ((rv = mkdir (newdir, 0700)) == -1 && errno == EEXIST);
  
  if (rv == -1)
    return -1;
  
  snprintf (newfile, nflen, "%s/%s", newdir, NONULL(basename));
  return 0;  
}

int mutt_put_file_in_place (const char *path, const char *safe_file, const char *safe_dir)
{
  int rv;
  
  rv = safe_rename (safe_file, path);
  unlink (safe_file);
  rmdir (safe_dir);
  return rv;
}

int safe_open (const char *path, int flags)
{
  struct stat osb, nsb;
  int fd;

  if (flags & O_EXCL) 
  {
    char safe_file[_POSIX_PATH_MAX];
    char safe_dir[_POSIX_PATH_MAX];

    if (mutt_mkwrapdir (path, safe_file, sizeof (safe_file),
			safe_dir, sizeof (safe_dir)) == -1)
      return -1;
    
    if ((fd = open (safe_file, flags, 0600)) < 0)
    {
      rmdir (safe_dir);
      return fd;
    }
    
    if (mutt_put_file_in_place (path, safe_file, safe_dir) == -1)
    {
      close (fd);
      return -1;
    }
  }
  else
  {
    if ((fd = open (path, flags, 0600)) < 0)
      return fd;
  }
    
  /* make sure the file is not symlink */
  if (lstat (path, &osb) < 0 || fstat (fd, &nsb) < 0 ||
      compare_stat(&osb, &nsb) == -1)
  {
/*    dprint (1, (debugfile, "safe_open(): %s is a symlink!\n", path)); */
    close (fd);
    return (-1);
  }

  return (fd);
}

/* when opening files for writing, make sure the file doesn't already exist
 * to avoid race conditions.
 */
FILE *safe_fopen (const char *path, const char *mode)
{
  if (mode[0] == 'w')
  {
    int fd;
    int flags = O_CREAT | O_EXCL;

#ifdef O_NOFOLLOW
    flags |= O_NOFOLLOW;
#endif

    if (mode[1] == '+')
      flags |= O_RDWR;
    else
      flags |= O_WRONLY;

    if ((fd = safe_open (path, flags)) < 0)
      return (NULL);

    return (fdopen (fd, mode));
  }
  else
    return (fopen (path, mode));
}

static char safe_chars[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+@{}._-:%/";

void mutt_sanitize_filename (char *f, short slash)
{
  if (!f) return;

  for (; *f; f++)
  {
    if ((slash && *f == '/') || !strchr (safe_chars, *f))
      *f = '_';
  }
}

/* these characters must be escaped in regular expressions */

static char rx_special_chars[] = "^.[$()|*+?{\\";

int mutt_rx_sanitize_string (char *dest, size_t destlen, const char *src)
{
  while (*src && --destlen > 2)
  {
    if (strchr (rx_special_chars, *src))
    {
      *dest++ = '\\';
      destlen--;
    }
    *dest++ = *src++;
  }
  
  *dest = '\0';
  
  if (*src)
    return -1;
  else
    return 0;
}

/* Read a line from ``fp'' into the dynamically allocated ``s'',
 * increasing ``s'' if necessary. The ending "\n" or "\r\n" is removed.
 * If a line ends with "\", this char and the linefeed is removed,
 * and the next line is read too.
 */
char *mutt_read_line (char *s, size_t *size, FILE *fp, int *line)
{
  size_t offset = 0;
  char *ch;

  if (!s)
  {
    s = safe_malloc (STRING);
    *size = STRING;
  }

  FOREVER
  {
    if (fgets (s + offset, *size - offset, fp) == NULL)
    {
      FREE (&s);
      return NULL;
    }
    if ((ch = strchr (s + offset, '\n')) != NULL)
    {
      (*line)++;
      *ch = 0;
      if (ch > s && *(ch - 1) == '\r')
	*--ch = 0;
      if (ch == s || *(ch - 1) != '\\')
	return s;
      offset = ch - s - 1;
    }
    else
    {
      int c;
      c = getc (fp); /* This is kind of a hack. We want to know if the
                        char at the current point in the input stream is EOF.
                        feof() will only tell us if we've already hit EOF, not
                        if the next character is EOF. So, we need to read in
                        the next character and manually check if it is EOF. */
      if (c == EOF)
      {
        /* The last line of fp isn't \n terminated */
        (*line)++;
        return s;
      }
      else
      {
        ungetc (c, fp); /* undo our dammage */
        /* There wasn't room for the line -- increase ``s'' */
        offset = *size - 1; /* overwrite the terminating 0 */
        *size += STRING;
        safe_realloc (&s, *size);
      }
    }
  }
}

char *
mutt_substrcpy (char *dest, const char *beg, const char *end, size_t destlen)
{
  size_t len;

  len = end - beg;
  if (len > destlen - 1)
    len = destlen - 1;
  memcpy (dest, beg, len);
  dest[len] = 0;
  return dest;
}

char *mutt_substrdup (const char *begin, const char *end)
{
  size_t len;
  char *p;

  if (end)
    len = end - begin;
  else
    len = strlen (begin);

  p = safe_malloc (len + 1);
  memcpy (p, begin, len);
  p[len] = 0;
  return p;
}

/* prepare a file name to survive the shell's quoting rules.
 * From the Unix programming FAQ by way of Liviu.
 */

size_t mutt_quote_filename (char *d, size_t l, const char *f)
{
  size_t i, j = 0;

  if(!f) 
  {
    *d = '\0';
    return 0;
  }

  /* leave some space for the trailing characters. */
  l -= 6;
  
  d[j++] = '\'';
  
  for(i = 0; j < l && f[i]; i++)
  {
    if(f[i] == '\'' || f[i] == '`')
    {
      d[j++] = '\'';
      d[j++] = '\\';
      d[j++] = f[i];
      d[j++] = '\'';
    }
    else
      d[j++] = f[i];
  }
  
  d[j++] = '\'';
  d[j]   = '\0';
  
  return j;
}

/* NULL-pointer aware string comparison functions */

int mutt_strcmp(const char *a, const char *b)
{
  return strcmp(NONULL(a), NONULL(b));
}

int mutt_strcasecmp(const char *a, const char *b)
{
  return strcasecmp(NONULL(a), NONULL(b));
}

int mutt_strncmp(const char *a, const char *b, size_t l)
{
  return strncmp(NONULL(a), NONULL(b), l);
}

int mutt_strncasecmp(const char *a, const char *b, size_t l)
{
  return strncasecmp(NONULL(a), NONULL(b), l);
}

size_t mutt_strlen(const char *a)
{
  return a ? strlen (a) : 0;
}

int mutt_strcoll(const char *a, const char *b)
{
  return strcoll(NONULL(a), NONULL(b));
}

const char *mutt_stristr (const char *haystack, const char *needle)
{
  const char *p, *q;

  if (!haystack)
    return NULL;
  if (!needle)
    return (haystack);

  while (*(p = haystack))
  {
    for (q = needle;
         *p && *q &&
           tolower ((unsigned char) *p) == tolower ((unsigned char) *q);
         p++, q++)
      ;
    if (!*q)
      return (haystack);
    haystack++;
  }
  return NULL;
}

char *mutt_skip_whitespace (char *p)
{
  SKIPWS (p);
  return p;
}

void mutt_remove_trailing_ws (char *s)
{
  char *p;
  
  for (p = s + mutt_strlen (s) - 1 ; p >= s && ISSPACE (*p) ; p--)
    *p = 0;
}

char *mutt_concat_path (char *d, const char *dir, const char *fname, size_t l)
{
  const char *fmt = "%s/%s";
  
  if (!*fname || (*dir && dir[strlen(dir)-1] == '/'))
    fmt = "%s%s";
  
  snprintf (d, l, fmt, dir, fname);
  return d;
}

const char *mutt_basename (const char *f)
{
  const char *p = strrchr (f, '/');
  if (p)
    return p + 1;
  else
    return f;
}

const char *
mutt_strsysexit(int e)
{
  int i;
  
  for(i = 0; sysexits_h[i].str; i++)
  {
    if(e == sysexits_h[i].v)
      break;
  }
  
  return sysexits_h[i].str;
}