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git/wildmatch.c
Anthony Ramine b79c0c3755 wildmatch: properly fold case everywhere 
Case folding is not done correctly when matching against the [:upper:]
character class and uppercased character ranges (e.g. A-Z).
Specifically, an uppercase letter fails to match against any of them
when case folding is requested because plain characters in the pattern
and the whole string are preemptively lowercased to handle the base case
fast.

That optimization is kept and ISLOWER() is used in the [:upper:] case
when case folding is requested, while matching against a character range
is retried with toupper() if the character was lowercase, as the bounds
of the range itself cannot be modified (in a case-insensitive context,
[A-_] is not equivalent to [a-_]).

Signed-off-by: Anthony Ramine <n.oxyde@gmail.com>
Reviewed-by: Duy Nguyen <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-06-02 14:13:05 -07:00

280 lines
7.8 KiB
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);
}
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