X-Git-Url: https://git.sesse.net/?p=rdpsrv;a=blobdiff_plain;f=Xserver%2Fconfig%2Futil%2Fmkshadow%2Fwildmat.c;fp=Xserver%2Fconfig%2Futil%2Fmkshadow%2Fwildmat.c;h=2e408e902e237224c60ca97b09d7bac2f34400d4;hp=0000000000000000000000000000000000000000;hb=b6e6afccf37f4ad0515ef2a698f714fdf1bf23b3;hpb=e3340a110a3b01756b8e67531395a33b40a17d37

diff --git a/Xserver/config/util/mkshadow/wildmat.c b/Xserver/config/util/mkshadow/wildmat.c
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+/* $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;
+}
+
+
+
+#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 */