1/* Copyright (C) 1992 Free Software Foundation, Inc.
2This file is part of the GNU C Library.
3
4The GNU C Library is free software; you can redistribute it and/or
5modify it under the terms of the GNU Library General Public License as
6published by the Free Software Foundation; either version 2 of the
7License, or (at your option) any later version.
8
9The GNU C Library is distributed in the hope that it will be useful,
10but WITHOUT ANY WARRANTY; without even the implied warranty of
11MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12Library General Public License for more details.  */
13
14/* Modified slightly by Brian Berliner <berliner@sun.com> and
15   Jim Blandy <jimb@cyclic.com> for CVS use */
16
17#ifdef HAVE_CONFIG_H
18# include "config.h"
19#endif
20
21#include "system.h"
22
23/* IGNORE(@ */
24/* #include <ansidecl.h> */
25/* @) */
26#include <errno.h>
27#include "fnmatch.h"
28
29#if !defined(__GNU_LIBRARY__) && !defined(STDC_HEADERS)
30extern int errno;
31#endif
32
33/* Match STRING against the filename pattern PATTERN, returning zero if
34   it matches, nonzero if not.  */
35int
36#if __STDC__
37fnmatch (const char *pattern, const char *string, int flags)
38#else
39fnmatch (pattern, string, flags)
40    char *pattern;
41    char *string;
42    int flags;
43#endif
44{
45  register const char *p = pattern, *n = string;
46  register char c;
47
48  if ((flags & ~__FNM_FLAGS) != 0)
49    {
50      errno = EINVAL;
51      return -1;
52    }
53
54  while ((c = *p++) != '\0')
55    {
56      switch (c)
57	{
58	case '?':
59	  if (*n == '\0')
60	    return FNM_NOMATCH;
61	  else if ((flags & FNM_PATHNAME) && *n == '/')
62	    return FNM_NOMATCH;
63	  else if ((flags & FNM_PERIOD) && *n == '.' &&
64		   (n == string || ((flags & FNM_PATHNAME) && n[-1] == '/')))
65	    return FNM_NOMATCH;
66	  break;
67
68	case '\\':
69	  if (!(flags & FNM_NOESCAPE))
70	    c = *p++;
71	  if (FOLD_FN_CHAR (*n) != FOLD_FN_CHAR (c))
72	    return FNM_NOMATCH;
73	  break;
74
75	case '*':
76	  if ((flags & FNM_PERIOD) && *n == '.' &&
77	      (n == string || ((flags & FNM_PATHNAME) && n[-1] == '/')))
78	    return FNM_NOMATCH;
79
80	  for (c = *p++; c == '?' || c == '*'; c = *p++, ++n)
81	    if (((flags & FNM_PATHNAME) && *n == '/') ||
82		(c == '?' && *n == '\0'))
83	      return FNM_NOMATCH;
84
85	  if (c == '\0')
86	    return 0;
87
88	  {
89	    char c1 = (!(flags & FNM_NOESCAPE) && c == '\\') ? *p : c;
90	    for (--p; *n != '\0'; ++n)
91	      if ((c == '[' || FOLD_FN_CHAR (*n) == FOLD_FN_CHAR (c1)) &&
92		  fnmatch(p, n, flags & ~FNM_PERIOD) == 0)
93		return 0;
94	    return FNM_NOMATCH;
95	  }
96
97	case '[':
98	  {
99	    /* Nonzero if the sense of the character class is inverted.  */
100	    register int not;
101
102	    if (*n == '\0')
103	      return FNM_NOMATCH;
104
105	    if ((flags & FNM_PERIOD) && *n == '.' &&
106		(n == string || ((flags & FNM_PATHNAME) && n[-1] == '/')))
107	      return FNM_NOMATCH;
108
109	    not = (*p == '!' || *p == '^');
110	    if (not)
111	      ++p;
112
113	    c = *p++;
114	    for (;;)
115	      {
116		register char cstart = c, cend = c;
117
118		if (!(flags & FNM_NOESCAPE) && c == '\\')
119		  cstart = cend = *p++;
120
121		if (c == '\0')
122		  /* [ (unterminated) loses.  */
123		  return FNM_NOMATCH;
124
125		c = *p++;
126
127		if ((flags & FNM_PATHNAME) && c == '/')
128		  /* [/] can never match.  */
129		  return FNM_NOMATCH;
130
131		if (c == '-' && *p != ']')
132		  {
133		    cend = *p++;
134		    if (!(flags & FNM_NOESCAPE) && cend == '\\')
135		      cend = *p++;
136		    if (cend == '\0')
137		      return FNM_NOMATCH;
138		    c = *p++;
139		  }
140
141		if (*n >= cstart && *n <= cend)
142		  goto matched;
143
144		if (c == ']')
145		  break;
146	      }
147	    if (!not)
148	      return FNM_NOMATCH;
149	    break;
150
151	  matched:;
152	    /* Skip the rest of the [...] that already matched.  */
153	    while (c != ']')
154	      {
155		if (c == '\0')
156		  /* [... (unterminated) loses.  */
157		  return FNM_NOMATCH;
158
159		c = *p++;
160		if (!(flags & FNM_NOESCAPE) && c == '\\')
161		  /* 1003.2d11 is unclear if this is right.  %%% */
162		  ++p;
163	      }
164	    if (not)
165	      return FNM_NOMATCH;
166	  }
167	  break;
168
169	default:
170	  if (FOLD_FN_CHAR (c) != FOLD_FN_CHAR (*n))
171	    return FNM_NOMATCH;
172	}
173
174      ++n;
175    }
176
177  if (*n == '\0')
178    return 0;
179
180  return FNM_NOMATCH;
181}
182