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/*
* fnmatch.c
*
* Copyright (c) 2012 Marko Kreen
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Differences from POSIX:
* - ^ can be used in place of !
* - \ is escape in bracket expression, unless FNM_NOESCAPE is given.
* - FNM_CASEFOLD
* - FNM_LEADING_DIR
*/
#include <usual/fnmatch.h>
#include <usual/wchar.h>
#include <string.h>
#ifdef NEED_USUAL_FNMATCH
/* compare chars with case folding */
static inline bool cmp_fold(wchar_t c1, wchar_t c2, int flags)
{
if (c1 == c2)
return true;
if (flags & FNM_CASEFOLD) {
if (iswupper(c1) && iswlower(c2))
return c1 == (wchar_t)towupper(c2);
else if (iswlower(c1) && iswupper(c2))
return c1 == (wchar_t)towlower(c2);
}
return false;
}
/* compare char to range with case folding */
static inline bool range_fold(wchar_t c, wchar_t r1, wchar_t r2, int flags)
{
if (c >= r1 && c <= r2)
return true;
if (flags & FNM_CASEFOLD) {
/* convert only if it makes sense */
if (iswupper(c) && iswlower(r1) && iswlower(r2)) {
c = towlower(c);
if (c >= r1 && c <= r2)
return true;
} else if (iswlower(c) && iswupper(r1) && iswupper(r2)) {
c = towupper(c);
if (c >= r1 && c <= r2)
return true;
}
}
return false;
}
/* match bracket expression */
static const wchar_t *match_class(const wchar_t *pat, wchar_t c, int flags)
{
const wchar_t *p = pat;
const wchar_t *start;
bool neg = false;
bool match = false;
bool fallback_ok = true;
const wchar_t *n1, *n2;
wctype_t wct;
/* negation */
if (*p == '!' || *p == '^') {
neg = true;
p++;
}
start = p;
loop:
/* named class, equivalence class or collating symbol */
if (p[0] == '[' && (p[1] == ':' || p[1] == '.' || p[1] == '=')) {
n1 = p + 2;
n2 = wcschr(n1, p[1]);
if (!n2 || n2[1] != ']')
goto parse_fail;
if (p[1] != ':')
return NULL;
p = n2 + 2;
wct = wctype_wcsn(n1, n2-n1);
if (wct == (wctype_t)0)
return NULL;
if (iswctype(c, wct))
match = true;
fallback_ok = false;
/* skip rest */
goto loop;
}
parse_fail:
/* unexpected pattern end */
if (p[0] == '\0') {
/* only open bracket exists, take it as literal */
if (fallback_ok && c == '[')
return pat - 1;
return NULL;
}
/* closing bracket */
if (p[0] == ']' && p != start)
return (match ^ neg) ? p : NULL;
/* escape next char */
if (p[0] == '\\' && !(flags & FNM_NOESCAPE)) {
if (p[1] == '\0')
return NULL;
p++;
}
/* its either simple range or char */
if (p[1] == '-' && p[2] != ']' && p[2] != '\0') {
wchar_t r1 = p[0];
wchar_t r2 = p[2];
if (r2 == '\\' && !(flags & FNM_NOESCAPE)) {
p++;
r2 = p[2];
if (r2 == '\0')
return NULL;
}
if (range_fold(c, r1, r2, flags))
match = true;
p += 3;
} else {
if (cmp_fold(c, p[0], flags))
match = true;
p++;
}
goto loop;
}
/*
* FNM_PATHNAME disallows wildcard match for '/',
* FNM_PERIOD disallows wildcard match for leading '.',
* check for string end also.
*/
static bool disallow_wildcard(const wchar_t *s, const wchar_t *str, int flags)
{
if (*s == '\0')
return true;
if (*s == '/')
return (flags & FNM_PATHNAME);
if (*s == '.' && (flags & FNM_PERIOD)) {
if (s == str)
return true;
if (s[-1] == '/' && (flags & FNM_PATHNAME))
return true;
}
return false;
}
/*
* Non-recursive fnmatch(), based on globmatch() by <linux@horizon.com>
*/
static int wfnmatch(const wchar_t *pat, const wchar_t *str, int flags)
{
const wchar_t *p = pat;
const wchar_t *s = str;
const wchar_t *retry_p = NULL;
const wchar_t *skip_s = NULL;
loop:
switch (*p) {
case '*':
/* match any number of chars from this position on */
retry_p = p + 1;
skip_s = s;
/* dot after '*' must not match leading dot */
if (p[1] == '.' && disallow_wildcard(s, str, flags))
return FNM_NOMATCH;
break;
case '?':
/* match any char */
if (disallow_wildcard(s, str, flags))
goto nomatch_retry;
s++;
break;
case '[':
/* match character class */
if (disallow_wildcard(s, str, flags))
goto nomatch_retry;
p = match_class(p + 1, *s, flags);
if (p == NULL)
goto nomatch_retry;
s++;
break;
case '\\':
/* escape next char */
if (!(flags & FNM_NOESCAPE)) {
p++;
if (*p == '\0')
return FNM_NOMATCH;
}
default:
/* match single char */
if (*s == '/' && *p == '\0' && (flags & FNM_LEADING_DIR))
return 0;
if (!cmp_fold(*p, *s, flags))
goto nomatch_retry;
if (*s == '\0')
return 0;
s++;
}
p++;
goto loop;
nomatch_retry:
/* eat chars with '*', if possible */
if (retry_p == NULL || *s == '\0')
return FNM_NOMATCH;
s = skip_s++;
p = retry_p;
if (*s == '\0')
return (*p == '\0') ? 0 : FNM_NOMATCH;
if (disallow_wildcard(s, str, flags))
return FNM_NOMATCH;
s++;
goto loop;
}
/*
* Convert locale-specific encoding to wchar_t string
*/
int fnmatch(const char *pat, const char *str, int flags)
{
const wchar_t *wpat, *wstr;
wchar_t pbuf[128];
wchar_t sbuf[128];
int plen = strlen(pat);
int slen = strlen(str);
int res;
/* convert encoding */
wpat = mbstr_decode(pat, plen, NULL, pbuf, sizeof(pbuf) / sizeof(wchar_t), false);
if (!wpat)
return (errno == EILSEQ) ? FNM_NOMATCH : -1;
wstr = mbstr_decode(str, slen, NULL, sbuf, sizeof(sbuf) / sizeof(wchar_t), true);
if (!wstr)
return -1;
/* run actual fnmatch */
res = wfnmatch(wpat, wstr, flags);
/* free buffers */
if (wstr != sbuf)
free(wstr);
if (wpat != pbuf)
free(wpat);
return res;
}
#endif
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