+++ /dev/null
-/* $XConsortium: wildmat.c,v 1.2 94/04/13 18:40:59 rws Exp $ */
-/*
-**
-** 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@bbn.com>.
-** 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, then 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(text, p)
- register char *text;
- register char *p;
-{
- register int last;
- register int matched;
- register int reverse;
-
- for ( ; *p; text++, p++) {
- if (*text == '\0' && *p != '*')
- return ABORT;
- switch (*p) {
- case '\\':
- /* Literal match with following character. */
- p++;
- /* FALLTHROUGH */
- default:
- if (*text != *p)
- return FALSE;
- continue;
- case '?':
- /* Match anything. */
- continue;
- case '*':
- while (*++p == '*')
- /* Consecutive stars act just like one. */
- continue;
- if (*p == '\0')
- /* Trailing star matches everything. */
- return TRUE;
- while (*text)
- if ((matched = DoMatch(text++, p)) != FALSE)
- return matched;
- return ABORT;
- case '[':
- reverse = p[1] == NEGATE_CLASS ? TRUE : FALSE;
- if (reverse)
- /* Inverted character class. */
- p++;
- for (last = 0400, matched = FALSE; *++p && *p != ']'; last = *p)
- /* This next line requires a good C compiler. */
- if (*p == '-' ? *text <= *++p && *text >= last : *text == *p)
- matched = TRUE;
- if (matched == reverse)
- 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(text, p)
- 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;
-}
-
-\f
-
-#ifdef TEST
-#include <stdio.h>
-
-/* Yes, we use gets not fgets. Sue me. */
-extern char *gets();
-
-
-main()
-{
- char p[80];
- char text[80];
-
- printf("Wildmat tester. Enter pattern, then strings to test.\n");
- printf("A blank line gets prompts for a new pattern; a blank pattern\n");
- printf("exits the program.\n");
-
- for ( ; ; ) {
- printf("\nEnter pattern: ");
- (void)fflush(stdout);
- if (gets(p) == NULL || p[0] == '\0')
- break;
- for ( ; ; ) {
- printf("Enter text: ");
- (void)fflush(stdout);
- if (gets(text) == NULL)
- exit(0);
- if (text[0] == '\0')
- /* Blank line; go back and get a new pattern. */
- break;
- printf(" %s\n", wildmat(text, p) ? "YES" : "NO");
- }
- }
-
- exit(0);
- /* NOTREACHED */
-}
-#endif /* TEST */
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