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/*** wildmat.c.orig Wed Dec 3 11:46:31 1997 */
/* $Revision: 1.1 $
*
* Do shell-style pattern matching for ?, \, [], and * characters.
* Might not be robust in face of malformed patterns; e.g., "foo[a-"
* could cause a segmentation violation. It is 8bit clean.
*
* Written by Rich $alz, mirror!rs, Wed Nov 26 19:03:17 EST 1986.
* Rich $alz is now <rsalz@osf.org>.
* April, 1991: Replaced mutually-recursive calls with in-line code
* for the star character.
*
* Special thanks to Lars Mathiesen <thorinn@diku.dk> for the ABORT code.
* This can greatly speed up failing wildcard patterns. For example:
* pattern: -*-*-*-*-*-*-12-*-*-*-m-*-*-*
* text 1: -adobe-courier-bold-o-normal--12-120-75-75-m-70-iso8859-1
* text 2: -adobe-courier-bold-o-normal--12-120-75-75-X-70-iso8859-1
* Text 1 matches with 51 calls, while text 2 fails with 54 calls. Without
* the ABORT code, it takes 22310 calls to fail. Ugh. The following
* explanation is from Lars:
* The precondition that must be fulfilled is that DoMatch will consume
* at least one character in text. This is true if *p is neither '*' nor
* '\0'.) The last return has ABORT instead of FALSE to avoid quadratic
* behaviour in cases like pattern "*a*b*c*d" with text "abcxxxxx". With
* FALSE, each star-loop has to run to the end of the text; with ABORT
* only the last one does.
*
* Once the control of one instance of DoMatch enters the star-loop, that
* instance will return either TRUE or ABORT, and any calling instance
* will therefore return immediately after (without calling recursively
* again). In effect, only one star-loop is ever active. It would be
* possible to modify the code to maintain this context explicitly,
* eliminating all recursive calls at the cost of some complication and
* loss of clarity (and the ABORT stuff seems to be unclear enough by
* itself). I think it would be unwise to try to get this into a
* released version unless you have a good test data base to try it out
* on.
*/
#define TRUE 1
#define FALSE 0
#define ABORT -1
/* What character marks an inverted character class? */
#define NEGATE_CLASS '^'
/* Is "*" a common pattern? */
#define OPTIMIZE_JUST_STAR
/* Do tar(1) matching rules, which ignore a trailing slash? */
#undef MATCH_TAR_PATTERN
/**
* Match text and p, return TRUE, FALSE, or ABORT.
*/
static int DoMatch(char *text, char *p)
{
int last;
int matched;
int reverse;
for (; *p; text++, p++) {
if (*text == '\0' && *p != '*') return ABORT;
switch (*p) {
case '\\': /* Literal match with following character. */ p++;
case '?': /* Match anything. */ continue;
case '*': /* Consecutive stars act just like one. */
while (*++p == '*') continue;
if (*p == '\0') return TRUE; /* Trailing star matches everything. */
while (*text)
if ((matched = DoMatch(text++, p)) != FALSE) return matched;
return ABORT;
case '[':
reverse = p[1] == NEGATE_CLASS ? TRUE : FALSE;
if (reverse) p++; /* Inverted character class. */
matched = FALSE;
if (p[1] == ']' || p[1] == '-')
if (*++p == *text) matched = TRUE;
for (last = *p; *++p && *p != ']'; last = *p) /* This next line requires a good C compiler. */
if (*p == '-' && p[1] != ']' ? *text <= *++p && *text >= last : *text == *p) matched = TRUE;
if (matched == reverse) return FALSE;
continue;
default: /* FALLTHROUGH */
if (*text != *p) return FALSE;
continue;
}
}
#ifdef MATCH_TAR_PATTERN
if (*text == '/') return TRUE;
#endif /* MATCH_TAR_ATTERN */
return *text == '\0';
}
/**
* User-level routine. Returns TRUE or FALSE.
*/
int wildmat(char *text, char *p)
{
#ifdef OPTIMIZE_JUST_STAR
if (p[0] == '*' && p[1] == '\0') return TRUE;
#endif /* OPTIMIZE_JUST_STAR */
return DoMatch(text, p) == TRUE;
}
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