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git/wildmatch.c
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/* | |
** Do shell-style pattern matching for ?, \, [], and * characters. | |
** It is 8bit clean. | |
** | |
** Written by Rich $alz, mirror!rs, Wed Nov 26 19:03:17 EST 1986. | |
** Rich $alz is now <rsalz@bbn.com>. | |
** | |
** Modified by Wayne Davison to special-case '/' matching, to make '**' | |
** work differently than '*', and to fix the character-class code. | |
*/ | |
#include "cache.h" | |
#include "wildmatch.h" | |
typedef unsigned char uchar; | |
/* What character marks an inverted character class? */ | |
#define NEGATE_CLASS '!' | |
#define NEGATE_CLASS2 '^' | |
#define CC_EQ(class, len, litmatch) ((len) == sizeof (litmatch)-1 \ | |
&& *(class) == *(litmatch) \ | |
&& strncmp((char*)class, litmatch, len) == 0) | |
#if defined STDC_HEADERS || !defined isascii | |
# define ISASCII(c) 1 | |
#else | |
# define ISASCII(c) isascii(c) | |
#endif | |
#ifdef isblank | |
# define ISBLANK(c) (ISASCII(c) && isblank(c)) | |
#else | |
# define ISBLANK(c) ((c) == ' ' || (c) == '\t') | |
#endif | |
#ifdef isgraph | |
# define ISGRAPH(c) (ISASCII(c) && isgraph(c)) | |
#else | |
# define ISGRAPH(c) (ISASCII(c) && isprint(c) && !isspace(c)) | |
#endif | |
#define ISPRINT(c) (ISASCII(c) && isprint(c)) | |
#define ISDIGIT(c) (ISASCII(c) && isdigit(c)) | |
#define ISALNUM(c) (ISASCII(c) && isalnum(c)) | |
#define ISALPHA(c) (ISASCII(c) && isalpha(c)) | |
#define ISCNTRL(c) (ISASCII(c) && iscntrl(c)) | |
#define ISLOWER(c) (ISASCII(c) && islower(c)) | |
#define ISPUNCT(c) (ISASCII(c) && ispunct(c)) | |
#define ISSPACE(c) (ISASCII(c) && isspace(c)) | |
#define ISUPPER(c) (ISASCII(c) && isupper(c)) | |
#define ISXDIGIT(c) (ISASCII(c) && isxdigit(c)) | |
/* Match pattern "p" against "text" */ | |
static int dowild(const uchar *p, const uchar *text, unsigned int flags) | |
{ | |
uchar p_ch; | |
const uchar *pattern = p; | |
for ( ; (p_ch = *p) != '\0'; text++, p++) { | |
int matched, match_slash, negated; | |
uchar t_ch, prev_ch; | |
if ((t_ch = *text) == '\0' && p_ch != '*') | |
return WM_ABORT_ALL; | |
if ((flags & WM_CASEFOLD) && ISUPPER(t_ch)) | |
t_ch = tolower(t_ch); | |
if ((flags & WM_CASEFOLD) && ISUPPER(p_ch)) | |
p_ch = tolower(p_ch); | |
switch (p_ch) { | |
case '\\': | |
/* Literal match with following character. Note that the test | |
* in "default" handles the p[1] == '\0' failure case. */ | |
p_ch = *++p; | |
/* FALLTHROUGH */ | |
default: | |
if (t_ch != p_ch) | |
return WM_NOMATCH; | |
continue; | |
case '?': | |
/* Match anything but '/'. */ | |
if ((flags & WM_PATHNAME) && t_ch == '/') | |
return WM_NOMATCH; | |
continue; | |
case '*': | |
if (*++p == '*') { | |
const uchar *prev_p = p - 2; | |
while (*++p == '*') {} | |
if (!(flags & WM_PATHNAME)) | |
/* without WM_PATHNAME, '*' == '**' */ | |
match_slash = 1; | |
else if ((prev_p < pattern || *prev_p == '/') && | |
(*p == '\0' || *p == '/' || | |
(p[0] == '\\' && p[1] == '/'))) { | |
/* | |
* Assuming we already match 'foo/' and are at | |
* <star star slash>, just assume it matches | |
* nothing and go ahead match the rest of the | |
* pattern with the remaining string. This | |
* helps make foo/<*><*>/bar (<> because | |
* otherwise it breaks C comment syntax) match | |
* both foo/bar and foo/a/bar. | |
*/ | |
if (p[0] == '/' && | |
dowild(p + 1, text, flags) == WM_MATCH) | |
return WM_MATCH; | |
match_slash = 1; | |
} else | |
return WM_ABORT_MALFORMED; | |
} else | |
/* without WM_PATHNAME, '*' == '**' */ | |
match_slash = flags & WM_PATHNAME ? 0 : 1; | |
if (*p == '\0') { | |
/* Trailing "**" matches everything. Trailing "*" matches | |
* only if there are no more slash characters. */ | |
if (!match_slash) { | |
if (strchr((char*)text, '/') != NULL) | |
return WM_NOMATCH; | |
} | |
return WM_MATCH; | |
} else if (!match_slash && *p == '/') { | |
/* | |
* _one_ asterisk followed by a slash | |
* with WM_PATHNAME matches the next | |
* directory | |
*/ | |
const char *slash = strchr((char*)text, '/'); | |
if (!slash) | |
return WM_NOMATCH; | |
text = (const uchar*)slash; | |
/* the slash is consumed by the top-level for loop */ | |
break; | |
} | |
while (1) { | |
if (t_ch == '\0') | |
break; | |
/* | |
* Try to advance faster when an asterisk is | |
* followed by a literal. We know in this case | |
* that the the string before the literal | |
* must belong to "*". | |
* If match_slash is false, do not look past | |
* the first slash as it cannot belong to '*'. | |
*/ | |
if (!is_glob_special(*p)) { | |
p_ch = *p; | |
if ((flags & WM_CASEFOLD) && ISUPPER(p_ch)) | |
p_ch = tolower(p_ch); | |
while ((t_ch = *text) != '\0' && | |
(match_slash || t_ch != '/')) { | |
if ((flags & WM_CASEFOLD) && ISUPPER(t_ch)) | |
t_ch = tolower(t_ch); | |
if (t_ch == p_ch) | |
break; | |
text++; | |
} | |
if (t_ch != p_ch) | |
return WM_NOMATCH; | |
} | |
if ((matched = dowild(p, text, flags)) != WM_NOMATCH) { | |
if (!match_slash || matched != WM_ABORT_TO_STARSTAR) | |
return matched; | |
} else if (!match_slash && t_ch == '/') | |
return WM_ABORT_TO_STARSTAR; | |
t_ch = *++text; | |
} | |
return WM_ABORT_ALL; | |
case '[': | |
p_ch = *++p; | |
#ifdef NEGATE_CLASS2 | |
if (p_ch == NEGATE_CLASS2) | |
p_ch = NEGATE_CLASS; | |
#endif | |
/* Assign literal 1/0 because of "matched" comparison. */ | |
negated = p_ch == NEGATE_CLASS ? 1 : 0; | |
if (negated) { | |
/* Inverted character class. */ | |
p_ch = *++p; | |
} | |
prev_ch = 0; | |
matched = 0; | |
do { | |
if (!p_ch) | |
return WM_ABORT_ALL; | |
if (p_ch == '\\') { | |
p_ch = *++p; | |
if (!p_ch) | |
return WM_ABORT_ALL; | |
if (t_ch == p_ch) | |
matched = 1; | |
} else if (p_ch == '-' && prev_ch && p[1] && p[1] != ']') { | |
p_ch = *++p; | |
if (p_ch == '\\') { | |
p_ch = *++p; | |
if (!p_ch) | |
return WM_ABORT_ALL; | |
} | |
if (t_ch <= p_ch && t_ch >= prev_ch) | |
matched = 1; | |
else if ((flags & WM_CASEFOLD) && ISLOWER(t_ch)) { | |
uchar t_ch_upper = toupper(t_ch); | |
if (t_ch_upper <= p_ch && t_ch_upper >= prev_ch) | |
matched = 1; | |
} | |
p_ch = 0; /* This makes "prev_ch" get set to 0. */ | |
} else if (p_ch == '[' && p[1] == ':') { | |
const uchar *s; | |
int i; | |
for (s = p += 2; (p_ch = *p) && p_ch != ']'; p++) {} /*SHARED ITERATOR*/ | |
if (!p_ch) | |
return WM_ABORT_ALL; | |
i = p - s - 1; | |
if (i < 0 || p[-1] != ':') { | |
/* Didn't find ":]", so treat like a normal set. */ | |
p = s - 2; | |
p_ch = '['; | |
if (t_ch == p_ch) | |
matched = 1; | |
continue; | |
} | |
if (CC_EQ(s,i, "alnum")) { | |
if (ISALNUM(t_ch)) | |
matched = 1; | |
} else if (CC_EQ(s,i, "alpha")) { | |
if (ISALPHA(t_ch)) | |
matched = 1; | |
} else if (CC_EQ(s,i, "blank")) { | |
if (ISBLANK(t_ch)) | |
matched = 1; | |
} else if (CC_EQ(s,i, "cntrl")) { | |
if (ISCNTRL(t_ch)) | |
matched = 1; | |
} else if (CC_EQ(s,i, "digit")) { | |
if (ISDIGIT(t_ch)) | |
matched = 1; | |
} else if (CC_EQ(s,i, "graph")) { | |
if (ISGRAPH(t_ch)) | |
matched = 1; | |
} else if (CC_EQ(s,i, "lower")) { | |
if (ISLOWER(t_ch)) | |
matched = 1; | |
} else if (CC_EQ(s,i, "print")) { | |
if (ISPRINT(t_ch)) | |
matched = 1; | |
} else if (CC_EQ(s,i, "punct")) { | |
if (ISPUNCT(t_ch)) | |
matched = 1; | |
} else if (CC_EQ(s,i, "space")) { | |
if (ISSPACE(t_ch)) | |
matched = 1; | |
} else if (CC_EQ(s,i, "upper")) { | |
if (ISUPPER(t_ch)) | |
matched = 1; | |
else if ((flags & WM_CASEFOLD) && ISLOWER(t_ch)) | |
matched = 1; | |
} else if (CC_EQ(s,i, "xdigit")) { | |
if (ISXDIGIT(t_ch)) | |
matched = 1; | |
} else /* malformed [:class:] string */ | |
return WM_ABORT_ALL; | |
p_ch = 0; /* This makes "prev_ch" get set to 0. */ | |
} else if (t_ch == p_ch) | |
matched = 1; | |
} while (prev_ch = p_ch, (p_ch = *++p) != ']'); | |
if (matched == negated || | |
((flags & WM_PATHNAME) && t_ch == '/')) | |
return WM_NOMATCH; | |
continue; | |
} | |
} | |
return *text ? WM_NOMATCH : WM_MATCH; | |
} | |
/* Match the "pattern" against the "text" string. */ | |
int wildmatch(const char *pattern, const char *text, | |
unsigned int flags, struct wildopts *wo) | |
{ | |
return dowild((const uchar*)pattern, (const uchar*)text, flags); | |
} |