static const char rcsid[] = "$Id: wildmat.c,v 1.6 2004/08/11 15:11:21 will 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.
**
**  Modified 3 Mar 1993 by Will Deich, will@surya.caltech.edu:
**	A leading ^ means to complement the match; that is,
**	wildmat(string, "^"pat) returns TRUE if string does NOT
**	match the pattern.
**  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.
*/

#ifdef TEST
#include <stdio.h>
#endif

#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) {
	    #ifdef VERBOSETEST
		printf("fail:text=%c != pat=%c\n", *text, *p);
	    #endif
		return FALSE;
	    }
	    #ifdef VERBOSETEST
		printf("match:text=%c == pat=%c\n", *text, *p);
	    #endif
	    continue;
	case '?':
	    /* Match anything. */
	    #ifdef VERBOSETEST
		printf("match:text=%c ; pat=%c\n", *text, *p);
	    #endif
	    continue;
	case '*':
	    while (*++p == '*')
		/* Consecutive stars act just like one. */
		continue;
	    if (*p == '\0') {
		/* Trailing star matches everything. */
		#ifdef VERBOSETEST
		    printf("trailing * matches everything\n");
		#endif
		return TRUE;
	    }
	    while (*text) {
		if ((matched = DoMatch(text++, p)) != FALSE) {
		    return matched;
		}
	    }
	    #ifdef VERBOSETEST
		printf("ABORT!\n");
	    #endif
	    return ABORT;
	case '[':
	    reverse = p[1] == NEGATE_CLASS ? TRUE : FALSE;
	    #ifdef VERBOSETEST
		printf("char class\n");
	    #endif
	    if (reverse) {
		/* Inverted character class. */
		p++;
		#ifdef VERBOSETEST
		printf("(negated)\n");
		#endif
	    }
	    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;
		    #ifdef VERBOSETEST
		    printf("in char class, %c matched %c or maybe %c\n",
							    *text, *p, *(p-1));
		    #endif
		}
	    }
	    if (matched == reverse) {
		#ifdef VERBOSETEST
		    printf("failed match to class\n");
		#endif
		return FALSE;
	    }
	    continue;
	}
    }

#ifdef	MATCH_TAR_PATTERN
    if (*text == '/')
	return TRUE;
#endif	/* MATCH_TAR_PATTERN */

    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 (p[0] == '^') ? DoMatch(text,p+1) != TRUE : DoMatch(text, p) == TRUE;
}



#ifdef TEST

/* Yes, we use gets not fgets.  Sue me. */
extern char	*gets();


int
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	/* defined(TEST) */