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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 FALSE 0
#define TRUE 1
#define NOMATCH 1
#define MATCH 0
#define ABORT_ALL -1
#define ABORT_TO_STARSTAR -2
#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, int force_lower_case)
{
uchar p_ch;
for ( ; (p_ch = *p) != '\0'; text++, p++) {
int matched, special;
uchar t_ch, prev_ch;
if ((t_ch = *text) == '\0' && p_ch != '*')
return ABORT_ALL;
if (force_lower_case && ISUPPER(t_ch))
t_ch = tolower(t_ch);
if (force_lower_case && 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 NOMATCH;
continue;
case '?':
/* Match anything but '/'. */
if (t_ch == '/')
return NOMATCH;
continue;
case '*':
if (*++p == '*') {
while (*++p == '*') {}
special = TRUE;
} else
special = FALSE;
if (*p == '\0') {
/* Trailing "**" matches everything. Trailing "*" matches
* only if there are no more slash characters. */
if (!special) {
if (strchr((char*)text, '/') != NULL)
return NOMATCH;
}
return MATCH;
}
while (1) {
if (t_ch == '\0')
break;
if ((matched = dowild(p, text, force_lower_case)) != NOMATCH) {
if (!special || matched != ABORT_TO_STARSTAR)
return matched;
} else if (!special && t_ch == '/')
return ABORT_TO_STARSTAR;
t_ch = *++text;
}
return ABORT_ALL;
case '[':
p_ch = *++p;
#ifdef NEGATE_CLASS2
if (p_ch == NEGATE_CLASS2)
p_ch = NEGATE_CLASS;
#endif
/* Assign literal TRUE/FALSE because of "matched" comparison. */
special = p_ch == NEGATE_CLASS? TRUE : FALSE;
if (special) {
/* Inverted character class. */
p_ch = *++p;
}
prev_ch = 0;
matched = FALSE;
do {
if (!p_ch)
return ABORT_ALL;
if (p_ch == '\\') {
p_ch = *++p;
if (!p_ch)
return ABORT_ALL;
if (t_ch == p_ch)
matched = TRUE;
} else if (p_ch == '-' && prev_ch && p[1] && p[1] != ']') {
p_ch = *++p;
if (p_ch == '\\') {
p_ch = *++p;
if (!p_ch)
return ABORT_ALL;
}
if (t_ch <= p_ch && t_ch >= prev_ch)
matched = TRUE;
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 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 = TRUE;
continue;
}
if (CC_EQ(s,i, "alnum")) {
if (ISALNUM(t_ch))
matched = TRUE;
} else if (CC_EQ(s,i, "alpha")) {
if (ISALPHA(t_ch))
matched = TRUE;
} else if (CC_EQ(s,i, "blank")) {
if (ISBLANK(t_ch))
matched = TRUE;
} else if (CC_EQ(s,i, "cntrl")) {
if (ISCNTRL(t_ch))
matched = TRUE;
} else if (CC_EQ(s,i, "digit")) {
if (ISDIGIT(t_ch))
matched = TRUE;
} else if (CC_EQ(s,i, "graph")) {
if (ISGRAPH(t_ch))
matched = TRUE;
} else if (CC_EQ(s,i, "lower")) {
if (ISLOWER(t_ch))
matched = TRUE;
} else if (CC_EQ(s,i, "print")) {
if (ISPRINT(t_ch))
matched = TRUE;
} else if (CC_EQ(s,i, "punct")) {
if (ISPUNCT(t_ch))
matched = TRUE;
} else if (CC_EQ(s,i, "space")) {
if (ISSPACE(t_ch))
matched = TRUE;
} else if (CC_EQ(s,i, "upper")) {
if (ISUPPER(t_ch))
matched = TRUE;
} else if (CC_EQ(s,i, "xdigit")) {
if (ISXDIGIT(t_ch))
matched = TRUE;
} else /* malformed [:class:] string */
return ABORT_ALL;
p_ch = 0; /* This makes "prev_ch" get set to 0. */
} else if (t_ch == p_ch)
matched = TRUE;
} while (prev_ch = p_ch, (p_ch = *++p) != ']');
if (matched == special || t_ch == '/')
return NOMATCH;
continue;
}
}
return *text ? NOMATCH : MATCH;
}
/* Match the "pattern" against the "text" string. */
int wildmatch(const char *pattern, const char *text, int flags)
{
return dowild((const uchar*)pattern, (const uchar*)text,
flags & FNM_CASEFOLD ? 1 :0);
}
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