libiberty/fnmatch.c

   1 /* Copyright (C) 1991-2023 Free Software Foundation, Inc.
   2
   3 NOTE: This source is derived from an old version taken from the GNU C
   4 Library (glibc).
   5
   6 This program is free software; you can redistribute it and/or modify it
   7 under the terms of the GNU General Public License as published by the
   8 Free Software Foundation; either version 2, or (at your option) any
   9 later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, 51 Franklin Street - Fifth Floor,
  19 Boston, MA 02110-1301, USA.  */
  20
  21 #ifdef HAVE_CONFIG_H
  22 #if defined (CONFIG_BROKETS)
  23 /* We use <config.h> instead of "config.h" so that a compilation
  24    using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
  25    (which it would do because it found this file in $srcdir).  */
  26 #include <config.h>
  27 #else
  28 #include "config.h"
  29 #endif
  30 #endif
  31
  32
  33 #ifndef _GNU_SOURCE
  34 #define _GNU_SOURCE
  35 #endif
  36
  37 /* This code to undef const added in libiberty.  */
  38 #ifndef __STDC__
  39 /* This is a separate conditional since some stdc systems
  40    reject `defined (const)'.  */
  41 #ifndef const
  42 #define const
  43 #endif
  44 #endif
  45
  46 #include <errno.h>
  47 #include <fnmatch.h>
  48 #include <safe-ctype.h>
  49
  50 /* Comment out all this code if we are using the GNU C Library, and are not
  51    actually compiling the library itself.  This code is part of the GNU C
  52    Library, but also included in many other GNU distributions.  Compiling
  53    and linking in this code is a waste when using the GNU C library
  54    (especially if it is a shared library).  Rather than having every GNU
  55    program understand `configure --with-gnu-libc' and omit the object files,
  56    it is simpler to just do this in the source for each such file.  */
  57
  58 #if defined (_LIBC) || !defined (__GNU_LIBRARY__)
  59
  60
  61 #if !defined(__GNU_LIBRARY__) && !defined(STDC_HEADERS)
  62 extern int errno;
  63 #endif
  64
  65 /* Match STRING against the filename pattern PATTERN, returning zero if
  66    it matches, nonzero if not.  */
  67 int
  68 fnmatch (const char *pattern, const char *string, int flags)
  69 {
  70   register const char *p = pattern, *n = string;
  71   register unsigned char c;
  72
  73 #define FOLD(c) ((flags & FNM_CASEFOLD) ? TOLOWER (c) : (c))
  74
  75   while ((c = *p++) != '\0')
  76     {
  77       c = FOLD (c);
  78
  79       switch (c)
  80         {
  81         case '?':
  82           if (*n == '\0')
  83             return FNM_NOMATCH;
  84           else if ((flags & FNM_FILE_NAME) && *n == '/')
  85             return FNM_NOMATCH;
  86           else if ((flags & FNM_PERIOD) && *n == '.' &&
  87                    (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
  88             return FNM_NOMATCH;
  89           break;
  90
  91         case '\\':
  92           if (!(flags & FNM_NOESCAPE))
  93             {
  94               c = *p++;
  95               c = FOLD (c);
  96             }
  97           if (FOLD ((unsigned char)*n) != c)
  98             return FNM_NOMATCH;
  99           break;
 100
 101         case '*':
 102           if ((flags & FNM_PERIOD) && *n == '.' &&
 103               (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
 104             return FNM_NOMATCH;
 105
 106           for (c = *p++; c == '?' || c == '*'; c = *p++, ++n)
 107             if (((flags & FNM_FILE_NAME) && *n == '/') ||
 108                 (c == '?' && *n == '\0'))
 109               return FNM_NOMATCH;
 110
 111           if (c == '\0')
 112             return 0;
 113
 114           {
 115             unsigned char c1 = (!(flags & FNM_NOESCAPE) && c == '\\') ? *p : c;
 116             c1 = FOLD (c1);
 117             for (--p; *n != '\0'; ++n)
 118               if ((c == '[' || FOLD ((unsigned char)*n) == c1) &&
 119                   fnmatch (p, n, flags & ~FNM_PERIOD) == 0)
 120                 return 0;
 121             return FNM_NOMATCH;
 122           }
 123
 124         case '[':
 125           {
 126             /* Nonzero if the sense of the character class is inverted.  */
 127             register int negate;
 128
 129             if (*n == '\0')
 130               return FNM_NOMATCH;
 131
 132             if ((flags & FNM_PERIOD) && *n == '.' &&
 133                 (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
 134               return FNM_NOMATCH;
 135
 136             negate = (*p == '!' || *p == '^');
 137             if (negate)
 138               ++p;
 139
 140             c = *p++;
 141             for (;;)
 142               {
 143                 register unsigned char cstart = c, cend = c;
 144
 145                 if (!(flags & FNM_NOESCAPE) && c == '\\')
 146                   cstart = cend = *p++;
 147
 148                 cstart = cend = FOLD (cstart);
 149
 150                 if (c == '\0')
 151                   /* [ (unterminated) loses.  */
 152                   return FNM_NOMATCH;
 153
 154                 c = *p++;
 155                 c = FOLD (c);
 156
 157                 if ((flags & FNM_FILE_NAME) && c == '/')
 158                   /* [/] can never match.  */
 159                   return FNM_NOMATCH;
 160
 161                 if (c == '-' && *p != ']')
 162                   {
 163                     cend = *p++;
 164                     if (!(flags & FNM_NOESCAPE) && cend == '\\')
 165                       cend = *p++;
 166                     if (cend == '\0')
 167                       return FNM_NOMATCH;
 168                     cend = FOLD (cend);
 169
 170                     c = *p++;
 171                   }
 172
 173                 if (FOLD ((unsigned char)*n) >= cstart
 174                     && FOLD ((unsigned char)*n) <= cend)
 175                   goto matched;
 176
 177                 if (c == ']')
 178                   break;
 179               }
 180             if (!negate)
 181               return FNM_NOMATCH;
 182             break;
 183
 184           matched:;
 185             /* Skip the rest of the [...] that already matched.  */
 186             while (c != ']')
 187               {
 188                 if (c == '\0')
 189                   /* [... (unterminated) loses.  */
 190                   return FNM_NOMATCH;
 191
 192                 c = *p++;
 193                 if (!(flags & FNM_NOESCAPE) && c == '\\')
 194                   /* XXX 1003.2d11 is unclear if this is right.  */
 195                   ++p;
 196               }
 197             if (negate)
 198               return FNM_NOMATCH;
 199           }
 200           break;
 201
 202         default:
 203           if (c != FOLD ((unsigned char)*n))
 204             return FNM_NOMATCH;
 205         }
 206
 207       ++n;
 208     }
 209
 210   if (*n == '\0')
 211     return 0;
 212
 213   if ((flags & FNM_LEADING_DIR) && *n == '/')
 214     /* The FNM_LEADING_DIR flag says that "foo*" matches "foobar/frobozz".  */
 215     return 0;
 216
 217   return FNM_NOMATCH;
 218 }
 219
 220 #endif  /* _LIBC or not __GNU_LIBRARY__.  */