83 lines
1.7 KiB
C
83 lines
1.7 KiB
C
/*
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*
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* match.c
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*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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*
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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*
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* Created: Thu Jun 22 01:17:50 1995 ylo
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*
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* Simple pattern matching, with '*' and '?' as wildcards.
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*
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*/
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#include "includes.h"
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RCSID("$Id: match.c,v 1.4 1999/11/24 19:53:48 markus Exp $");
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#include "ssh.h"
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/*
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* Returns true if the given string matches the pattern (which may contain ?
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* and * as wildcards), and zero if it does not match.
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*/
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int
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match_pattern(const char *s, const char *pattern)
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{
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for (;;) {
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/* If at end of pattern, accept if also at end of string. */
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if (!*pattern)
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return !*s;
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if (*pattern == '*') {
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/* Skip the asterisk. */
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pattern++;
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/* If at end of pattern, accept immediately. */
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if (!*pattern)
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return 1;
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/* If next character in pattern is known, optimize. */
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if (*pattern != '?' && *pattern != '*') {
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/*
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* Look instances of the next character in
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* pattern, and try to match starting from
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* those.
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*/
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for (; *s; s++)
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if (*s == *pattern &&
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match_pattern(s + 1, pattern + 1))
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return 1;
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/* Failed. */
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return 0;
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}
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/*
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* Move ahead one character at a time and try to
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* match at each position.
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*/
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for (; *s; s++)
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if (match_pattern(s, pattern))
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return 1;
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/* Failed. */
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return 0;
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}
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/*
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* There must be at least one more character in the string.
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* If we are at the end, fail.
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*/
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if (!*s)
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return 0;
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/* Check if the next character of the string is acceptable. */
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if (*pattern != '?' && *pattern != *s)
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return 0;
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/* Move to the next character, both in string and in pattern. */
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s++;
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pattern++;
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}
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/* NOTREACHED */
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}
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