aboutsummaryrefslogtreecommitdiff
path: root/posix/fnmatch.c
blob: 553a968eed8ef29ef131510656ed6634a172bd4b (plain)
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
/* Copyright (C) 1991, 1992, 1993, 1996 Free Software Foundation, Inc.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

This library 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with this library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

#if HAVE_CONFIG_H
# include <config.h>
#endif

/* Enable GNU extensions in fnmatch.h.  */
#ifndef _GNU_SOURCE
# define _GNU_SOURCE	1
#endif

#include <errno.h>
#include <fnmatch.h>
#include <ctype.h>


/* Comment out all this code if we are using the GNU C Library, and are not
   actually compiling the library itself.  This code is part of the GNU C
   Library, but also included in many other GNU distributions.  Compiling
   and linking in this code is a waste when using the GNU C library
   (especially if it is a shared library).  Rather than having every GNU
   program understand `configure --with-gnu-libc' and omit the object files,
   it is simpler to just do this in the source for each such file.  */

#if defined (_LIBC) || !defined (__GNU_LIBRARY__)


# if defined (STDC_HEADERS) || !defined (isascii)
#  define ISASCII(c) 1
# else
#  define ISASCII(c) isascii(c)
# endif

# define ISUPPER(c) (ISASCII (c) && isupper (c))


# ifndef errno
extern int errno;
# endif

/* Match STRING against the filename pattern PATTERN, returning zero if
   it matches, nonzero if not.  */
int
fnmatch (pattern, string, flags)
     const char *pattern;
     const char *string;
     int flags;
{
  register const char *p = pattern, *n = string;
  register char c;

/* Note that this evalutes C many times.  */
# define FOLD(c) ((flags & FNM_CASEFOLD) && ISUPPER (c) ? tolower (c) : (c))

  while ((c = *p++) != '\0')
    {
      c = FOLD (c);

      switch (c)
	{
	case '?':
	  if (*n == '\0')
	    return FNM_NOMATCH;
	  else if ((flags & FNM_FILE_NAME) && *n == '/')
	    return FNM_NOMATCH;
	  else if ((flags & FNM_PERIOD) && *n == '.' &&
		   (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
	    return FNM_NOMATCH;
	  break;

	case '\\':
	  if (!(flags & FNM_NOESCAPE))
	    {
	      c = *p++;
	      if (c == '\0')
		/* Trailing \ loses.  */
		return FNM_NOMATCH;
	      c = FOLD (c);
	    }
	  if (FOLD (*n) != c)
	    return FNM_NOMATCH;
	  break;

	case '*':
	  if ((flags & FNM_PERIOD) && *n == '.' &&
	      (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
	    return FNM_NOMATCH;

	  for (c = *p++; c == '?' || c == '*'; c = *p++)
	    {
	      if ((flags & FNM_FILE_NAME) && *n == '/')
		/* A slash does not match a wildcard under FNM_FILE_NAME.  */
		return FNM_NOMATCH;
	      else if (c == '?')
		{
		  /* A ? needs to match one character.  */
		  if (*n == '\0')
		    /* There isn't another character; no match.  */
		    return FNM_NOMATCH;
		  else
		    /* One character of the string is consumed in matching
		       this ? wildcard, so *??? won't match if there are
		       less than three characters.  */
		    ++n;
		}
	    }

	  if (c == '\0')
	    return 0;

	  {
	    char c1 = (!(flags & FNM_NOESCAPE) && c == '\\') ? *p : c;
	    c1 = FOLD (c1);
	    for (--p; *n != '\0'; ++n)
	      if ((c == '[' || FOLD (*n) == c1) &&
		  fnmatch (p, n, flags & ~FNM_PERIOD) == 0)
		return 0;
	    return FNM_NOMATCH;
	  }

	case '[':
	  {
	    /* Nonzero if the sense of the character class is inverted.  */
	    register int not;

	    if (*n == '\0')
	      return FNM_NOMATCH;

	    if ((flags & FNM_PERIOD) && *n == '.' &&
		(n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
	      return FNM_NOMATCH;

	    not = (*p == '!' || *p == '^');
	    if (not)
	      ++p;

	    c = *p++;
	    for (;;)
	      {
		register char cstart = c, cend = c;

		if (!(flags & FNM_NOESCAPE) && c == '\\')
		  {
		    if (*p == '\0')
		      return FNM_NOMATCH;
		    cstart = cend = *p++;
		  }

		cstart = cend = FOLD (cstart);

		if (c == '\0')
		  /* [ (unterminated) loses.  */
		  return FNM_NOMATCH;

		c = *p++;
		c = FOLD (c);

		if ((flags & FNM_FILE_NAME) && c == '/')
		  /* [/] can never match.  */
		  return FNM_NOMATCH;

		if (c == '-' && *p != ']')
		  {
		    cend = *p++;
		    if (!(flags & FNM_NOESCAPE) && cend == '\\')
		      cend = *p++;
		    if (cend == '\0')
		      return FNM_NOMATCH;
		    cend = FOLD (cend);

		    c = *p++;
		  }

		if (FOLD (*n) >= cstart && FOLD (*n) <= cend)
		  goto matched;

		if (c == ']')
		  break;
	      }
	    if (!not)
	      return FNM_NOMATCH;
	    break;

	  matched:;
	    /* Skip the rest of the [...] that already matched.  */
	    while (c != ']')
	      {
		if (c == '\0')
		  /* [... (unterminated) loses.  */
		  return FNM_NOMATCH;

		c = *p++;
		if (!(flags & FNM_NOESCAPE) && c == '\\')
		  {
		    if (*p == '\0')
		      return FNM_NOMATCH;
		    /* XXX 1003.2d11 is unclear if this is right.  */
		    ++p;
		  }
	      }
	    if (not)
	      return FNM_NOMATCH;
	  }
	  break;

	default:
	  if (c != FOLD (*n))
	    return FNM_NOMATCH;
	}

      ++n;
    }

  if (*n == '\0')
    return 0;

  if ((flags & FNM_LEADING_DIR) && *n == '/')
    /* The FNM_LEADING_DIR flag says that "foo*" matches "foobar/frobozz".  */
    return 0;

  return FNM_NOMATCH;

# undef FOLD
}

#endif	/* _LIBC or not __GNU_LIBRARY__.  */