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/* $Source: /u/mark/src/pax/RCS/wildmat.c,v $
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*
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* $Revision: 1.2 $
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*
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* wildmat.c - simple regular expression pattern matching routines
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*
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* DESCRIPTION
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*
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* These routines provide simple UNIX style regular expression matching.
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* They were originally written by Rich Salz, the comp.sources.unix
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* moderator for inclusion in some of his software. These routines
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* were released into the public domain and used by John Gilmore in
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* USTAR.
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*
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* AUTHORS
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*
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* Mark H. Colburn, NAPS International (mark@jhereg.mn.org)
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* John Gilmore (gnu@hoptoad)
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* Rich Salz (rs@uunet.uu.net)
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*
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*
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* Sponsored by The USENIX Association for public distribution.
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*
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* Copyright (c) 1989 Mark H. Colburn.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice is duplicated in all such
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* forms and that any documentation, advertising materials, and other
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* materials related to such distribution and use acknowledge that the
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* software was developed * by Mark H. Colburn and sponsored by The
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* USENIX Association.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $Log: wildmat.c,v $
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* Revision 1.2 89/02/12 10:06:20 mark
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* 1.2 release fixes
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*
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* Revision 1.1 88/12/23 18:02:41 mark
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* Initial revision
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*
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*/
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#ifndef lint
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static char *ident = "$Id: wildmat.c,v 1.2 89/02/12 10:06:20 mark Exp $";
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static char *copyright = "Copyright (c) 1989 Mark H. Colburn.\nAll rights reserved.\n";
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#endif /* ! lint */
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/* Headers */
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#include "pax.h"
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/* Function Prototypes */
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#ifdef __STDC__
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static int star(char *, char *);
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#else /* !__STDC__ */
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static int star();
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#endif /* __STDC__ */
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/*
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* star - handle trailing * in a regular expression
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*
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* DESCRIPTION
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*
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* Star is used to match filename expansions containing a trailing
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* asterisk ('*'). Star call wildmat() to determine if the substring
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* passed to it is matches the regular expression.
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*
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* PARAMETERS
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*
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* char *source - The source string which is to be compared to the
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* regular expression pattern.
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* char *pattern - The regular expression which we are supposed to
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* match to.
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*
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* RETURNS
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*
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* Returns non-zero if the entire source string is completely matched by
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* the regular expression pattern, returns 0 otherwise. This is used to
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* see if *'s in a pattern matched the entire source string.
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*
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*/
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#ifdef __STDC__
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static int star(char *source, char *pattern)
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#else
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static int star(source, pattern)
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char *source; /* source operand */
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char *pattern; /* regular expression to match */
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#endif
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{
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while (!wildmat(pattern, source)) {
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if (*++source == '\0') {
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return (0);
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}
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}
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return (1);
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}
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/*
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* wildmat - match a regular expression
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*
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* DESCRIPTION
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*
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* Wildmat attempts to match the string pointed to by source to the
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* regular expression pointed to by pattern. The subset of regular
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* expression syntax which is supported is defined by POSIX P1003.2
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* FILENAME EXPANSION rules.
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*
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* PARAMETERS
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*
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* char *pattern - The regular expression which we are supposed to
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* match to.
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* char *source - The source string which is to be compared to the
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* regular expression pattern.
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*
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* RETURNS
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*
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* Returns non-zero if the source string matches the regular expression
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* pattern specified, returns 0 otherwise.
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*
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*/
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#ifdef __STDC__
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int wildmat(char *pattern, char *source)
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#else
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int wildmat(pattern, source)
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char *pattern; /* regular expression to match */
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char *source; /* source operand */
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#endif
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{
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int last; /* last character matched */
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int matched; /* !0 if a match occurred */
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int reverse; /* !0 if sense of match is reversed */
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for (; *pattern; source++, pattern++) {
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switch (*pattern) {
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case '\\':
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/* Literal match with following character */
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pattern++;
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/* FALLTHRU */
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default:
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if (*source != *pattern) {
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return (0);
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}
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continue;
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case '?':
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/* Match anything. */
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if (*source == '\0') {
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return (0);
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}
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continue;
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case '*':
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/* Trailing star matches everything. */
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return (*++pattern ? star(source, pattern) : 1);
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case '[':
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/* [^....] means inverse character class. */
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if (reverse = pattern[1] == '^') {
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pattern++;
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}
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for (last = 0400, matched = 0;
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*++pattern && *pattern != ']'; last = *pattern) {
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/* This next line requires a good C compiler. */
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if (*pattern == '-'
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? *source <= *++pattern && *source >= last
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: *source == *pattern) {
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matched = 1;
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}
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}
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if (matched == reverse) {
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return (0);
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}
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continue;
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}
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}
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/*
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* For "tar" use, matches that end at a slash also work. --hoptoad!gnu
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*/
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return (*source == '\0' || *source == '/');
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}
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