[unix-history] / gnu / usr.bin / tar / fnmatch.c

/* Copyright (C) 1991, 1992 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.  */

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

#if !defined(__GNU_LIBRARY__) && !defined(STDC_HEADERS)
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;

  if ((flags & ~__FNM_FLAGS) != 0)
    {
      errno = EINVAL;
      return -1;
    }

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

	case '\\':
	  if (!(flags & FNM_NOESCAPE))
	    c = *p++;
	  if (*n != c)
	    return FNM_NOMATCH;
	  break;

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

	  for (c = *p++; c == '?' || c == '*'; c = *p++, ++n)
	    if (((flags & FNM_PATHNAME) && *n == '/') ||
		(c == '?' && *n == '\0'))
	      return FNM_NOMATCH;

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

	  {
	    char c1 = (!(flags & FNM_NOESCAPE) && c == '\\') ? *p : c;
	    for (--p; *n != '\0'; ++n)
	      if ((c == '[' || *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_PATHNAME) && 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 == '\\')
		  cstart = cend = *p++;

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

		c = *p++;

		if ((flags & FNM_PATHNAME) && 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;
		    c = *p++;
		  }

		if (*n >= cstart && *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 == '\\')
		  /* 1003.2d11 is unclear if this is right.  %%% */
		  ++p;
	      }
	    if (not)
	      return FNM_NOMATCH;
	  }
	  break;

	default:
	  if (c != *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;
}
Commit	Line	Data
8c4ebc23 JH	1	/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
	2
	3	This library is free software; you can redistribute it and/or
	4	modify it under the terms of the GNU Library General Public License as
	5	published by the Free Software Foundation; either version 2 of the
	6	License, or (at your option) any later version.
	7
	8	This library is distributed in the hope that it will be useful,
	9	but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	11	Library General Public License for more details.
	12
	13	You should have received a copy of the GNU Library General Public
	14	License along with this library; see the file COPYING.LIB. If
	15	not, write to the Free Software Foundation, Inc., 675 Mass Ave,
	16	Cambridge, MA 02139, USA. */
	17
	18	#include <errno.h>
	19	#include <fnmatch.h>
	20
	21	#if !defined(__GNU_LIBRARY__) && !defined(STDC_HEADERS)
	22	extern int errno;
	23	#endif
	24
	25	/* Match STRING against the filename pattern PATTERN, returning zero if
	26	it matches, nonzero if not. */
	27	int
	28	fnmatch (pattern, string, flags)
	29	const char *pattern;
	30	const char *string;
	31	int flags;
	32	{
	33	register const char p = pattern, n = string;
	34	register char c;
	35
	36	if ((flags & ~__FNM_FLAGS) != 0)
	37	{
	38	errno = EINVAL;
	39	return -1;
	40	}
	41
	42	while ((c = *p++) != '\0')
	43	{
	44	switch (c)
	45	{
	46	case '?':
	47	if (*n == '\0')
	48	return FNM_NOMATCH;
	49	else if ((flags & FNM_PATHNAME) && *n == '/')
	50	return FNM_NOMATCH;
	51	else if ((flags & FNM_PERIOD) && *n == '.' &&
	52	(n == string \|\| ((flags & FNM_PATHNAME) && n[-1] == '/')))
	53	return FNM_NOMATCH;
	54	break;
	55
	56	case '\\':
	57	if (!(flags & FNM_NOESCAPE))
	58	c = *p++;
	59	if (*n != c)
	60	return FNM_NOMATCH;
	61	break;
	62
	63	case '*':
	64	if ((flags & FNM_PERIOD) && *n == '.' &&
65	(n == string \|\| ((flags & FNM_PATHNAME) && n[-1] == '/')))
66	return FNM_NOMATCH;
67
68	for (c = p++; c == '?' \|\| c == ''; c = *p++, ++n)
69	if (((flags & FNM_PATHNAME) && *n == '/') \|\|
70	(c == '?' && *n == '\0'))
71	return FNM_NOMATCH;
72
73	if (c == '\0')
74	return 0;
75
76	{
77	char c1 = (!(flags & FNM_NOESCAPE) && c == '\\') ? *p : c;
78	for (--p; *n != '\0'; ++n)
79	if ((c == '[' \|\| *n == c1) &&
80	fnmatch (p, n, flags & ~FNM_PERIOD) == 0)
81	return 0;
82	return FNM_NOMATCH;
83	}
84
85	case '[':
86	{
87	/* Nonzero if the sense of the character class is inverted. */
88	register int not;
89
90	if (*n == '\0')
91	return FNM_NOMATCH;
92
93	if ((flags & FNM_PERIOD) && *n == '.' &&
94	(n == string \|\| ((flags & FNM_PATHNAME) && n[-1] == '/')))
95	return FNM_NOMATCH;
96
97	not = (p == '!' \|\| p == '^');
98	if (not)
99	++p;
100
101	c = *p++;
102	for (;;)
103	{
104	register char cstart = c, cend = c;
105
106	if (!(flags & FNM_NOESCAPE) && c == '\\')
107	cstart = cend = *p++;
108
109	if (c == '\0')
110	/* [ (unterminated) loses. */
111	return FNM_NOMATCH;
112
113	c = *p++;
114
115	if ((flags & FNM_PATHNAME) && c == '/')
116	/* [/] can never match. */
117	return FNM_NOMATCH;
118
119	if (c == '-' && *p != ']')
120	{
121	cend = *p++;
122	if (!(flags & FNM_NOESCAPE) && cend == '\\')
123	cend = *p++;
124	if (cend == '\0')
125	return FNM_NOMATCH;
126	c = *p++;
127	}
128
129	if (n >= cstart && n <= cend)
130	goto matched;
131
132	if (c == ']')
133	break;
134	}
135	if (!not)
136	return FNM_NOMATCH;
137	break;
138
139	matched:;
140	/* Skip the rest of the [...] that already matched. */
141	while (c != ']')
142	{
143	if (c == '\0')
144	/* [... (unterminated) loses. */
145	return FNM_NOMATCH;
146
147	c = *p++;
148	if (!(flags & FNM_NOESCAPE) && c == '\\')
149	/* 1003.2d11 is unclear if this is right. %%% */
150	++p;
151	}
152	if (not)
153	return FNM_NOMATCH;
154	}
155	break;
156
157	default:
158	if (c != *n)
159	return FNM_NOMATCH;
160	}
161
162	++n;
163	}
164
165	if (*n == '\0')
166	return 0;
167
168	if ((flags & FNM_LEADING_DIR) && *n == '/')
169	/* The FNM_LEADING_DIR flag says that "foo" matches "foobar/frobozz". /
170	return 0;
171
172	return FNM_NOMATCH;
173	}