154 lines
3.8 KiB
C
Executable File
154 lines
3.8 KiB
C
Executable File
/*
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* PATMAT.C - Pattern matching. Taken from sh sources
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*/
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/*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <string.h>
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#define CTLESC '\\'
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/*
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* Returns true if the pattern matches the string.
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*/
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int patmat(char *string, char *pattern)
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{
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register char *p, *q;
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register char c;
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p = pattern;
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q = string;
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for (;;) {
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switch (c = *p++) {
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case '\0':
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goto breakloop;
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case CTLESC:
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if (*q++ != *p++)
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return 0;
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break;
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case '?':
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if (*q++ == '\0')
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return 0;
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break;
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case '*':
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c = *p;
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if (c != CTLESC && c != '?' && c != '*' && c != '[') {
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while (*q != c) {
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if (*q == '\0')
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return 0;
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q++;
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}
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}
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do {
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if (patmat(q, p))
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return 1;
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} while (*q++ != '\0');
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return 0;
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case '[': {
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char *endp;
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int invert, found;
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char chr;
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endp = p;
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if (*endp == '!')
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endp++;
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for (;;) {
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if (*endp == '\0')
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goto dft; /* no matching ] */
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if (*endp == CTLESC)
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endp++;
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if (*++endp == ']')
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break;
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}
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invert = 0;
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if (*p == '!') {
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invert++;
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p++;
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}
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found = 0;
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chr = *q++;
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c = *p++;
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do {
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if (c == CTLESC)
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c = *p++;
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if (*p == '-' && p[1] != ']') {
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p++;
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if (*p == CTLESC)
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p++;
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if (chr >= c && chr <= *p)
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found = 1;
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p++;
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} else {
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if (chr == c)
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found = 1;
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}
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} while ((c = *p++) != ']');
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if (found == invert)
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return 0;
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break;
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}
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dft: default:
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if (*q++ != c)
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return 0;
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break;
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}
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}
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breakloop:
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if (*q != '\0')
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return 0;
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return 1;
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}
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#ifdef TEST
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#include <stdio.h>
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int main(void)
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{
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printf("patmat(\"abcdefghi\", \"*ghi\"): %d\n", patmat("abcdefghi", "*ghi"));
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printf("patmat(\"abcdefghi\", \"??c??f*\"): %d\n", patmat("abcdefghi", "??c??f*"));
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printf("patmat(\"abcdefghi\", \"*dh*\"): %d\n", patmat("abcdefghi", "*dh*"));
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printf("patmat(\"abcdefghi\", \"*def\"): %d\n", patmat("abcdefghi", "*def"));
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return 0;
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}
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#endif
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