[rsync/rsync.git] / lib / wildmatch.c

/*
**  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 "rsync.h"

/* What character marks an inverted character class? */
#define NEGATE_CLASS '!'

#define false 0
#define true 1

/* Look for pattern "p" in the "text" string. */
int
wildmatch(const char *p, const char *text)
{
    int matched, special;
    char ch, prev;

    for ( ; (ch = *p) != '\0'; text++, p++) {
	if (*text == '\0' && ch != '*')
	    return false;
	switch (ch) {
	  case '\\':
	    /* Literal match with following character.  Note that the test
	     * in "default" handles the p[1] == '\0' failure case. */
	    ch = *++p;
	    /* FALLTHROUGH */
	  default:
	    if (*text != ch)
		return false;
	    continue;
	  case '?':
	    /* Match anything but '/'. */
	    if (*text == '/')
		return false;
	    continue;
	  case '*':
	    if (*++p == '*') {
		while (*++p == '*') {}
		special = true;
	    }
	    else
		special = false;
	    if (*p == '\0') {
		/* Trailing "**" matches everything. */
		return special? true : strchr(text, '/') == 0;
	    }
	    for ( ; *text; text++) {
		if (wildmatch(p, text))
		    return true;
		if (!special && *text == '/')
		    return false;
	    }
	    return false;
	  case '[':
	    special = *++p == NEGATE_CLASS ? true : false;
	    if (special) {
		/* Inverted character class. */
		p++;
	    }
	    prev = 0;
	    matched = false;
	    ch = *p;
	    if (ch == ']' || ch == '-') {
		if (*text == ch)
		    matched = true;
		prev = ch;
		ch = *++p;
	    }
	    for ( ; ch != ']'; prev = ch, ch = *++p) {
		if (!ch)
		    return false;
		if (ch == '-' && prev && p[1] && p[1] != ']') {
		    if (*text <= *++p && *text >= prev)
			matched = true;
		    ch = 0; /* This makes "prev" get set to 0. */
		}
		else if (*text == ch)
		    matched = true;
	    }
	    if (matched == special)
		return false;
	    continue;
	}
    }

    return *text == '\0';
}
Commit	Line	Data
446ee5b1 WD	1	/*
	2	** Do shell-style pattern matching for ?, \, [], and * characters.
	3	** It is 8bit clean.
	4	**
	5	** Written by Rich $alz, mirror!rs, Wed Nov 26 19:03:17 EST 1986.
	6	** Rich $alz is now <rsalz@bbn.com>.
	7	**
7a1f46b6 WD	8	Modified by Wayne Davison to special-case '/' matching, to make ''
7a1f46b6 WD	9	** work differently than '*', and to fix the character-class code.
446ee5b1 WD	10	*/
	11
	12	#include "rsync.h"
	13
	14	/* What character marks an inverted character class? */
	15	#define NEGATE_CLASS '!'
	16
	17	#define false 0
	18	#define true 1
	19
	20	/* Look for pattern "p" in the "text" string. */
	21	int
	22	wildmatch(const char p, const char text)
	23	{
	24	int matched, special;
	25	char ch, prev;
	26
	27	for ( ; (ch = *p) != '\0'; text++, p++) {
	28	if (text == '\0' && ch != '')
	29	return false;
	30	switch (ch) {
	31	case '\\':
	32	/* Literal match with following character. Note that the test
	33	* in "default" handles the p[1] == '\0' failure case. */
	34	ch = *++p;
	35	/* FALLTHROUGH */
	36	default:
	37	if (*text != ch)
	38	return false;
	39	continue;
	40	case '?':
	41	/* Match anything but '/'. */
	42	if (*text == '/')
	43	return false;
	44	continue;
	45	case '*':
	46	if (++p == '') {
	47	while (++p == '') {}
	48	special = true;
	49	}
	50	else
	51	special = false;
	52	if (*p == '\0') {
	53	/* Trailing "*" matches everything. /
	54	return special? true : strchr(text, '/') == 0;
	55	}
	56	for ( ; *text; text++) {
	57	if (wildmatch(p, text))
	58	return true;
	59	if (!special && *text == '/')
	60	return false;
	61	}
	62	return false;
	63	case '[':
	64	special = *++p == NEGATE_CLASS ? true : false;
	65	if (special) {
	66	/* Inverted character class. */
	67	p++;
	68	}
	69	prev = 0;
	70	matched = false;
	71	ch = *p;
	72	if (ch == ']' \|\| ch == '-') {
	73	if (*text == ch)
74	matched = true;
75	prev = ch;
76	ch = *++p;
77	}
78	for ( ; ch != ']'; prev = ch, ch = *++p) {
79	if (!ch)
80	return false;
81	if (ch == '-' && prev && p[1] && p[1] != ']') {
82	if (text <= ++p && *text >= prev)
83	matched = true;
7a1f46b6	84	ch = 0; /* This makes "prev" get set to 0. */
446ee5b1 WD	85	}
	86	else if (*text == ch)
	87	matched = true;
	88	}
	89	if (matched == special)
	90	return false;
	91	continue;
	92	}
	93	}
	94
	95	return *text == '\0';
	96	}