ref: 3c8246a31ce776976ee95310efa2c6e64a471993
dir: /sys/src/ape/cmd/pax/wildmat.c/
/* $Source: /u/mark/src/pax/RCS/wildmat.c,v $
*
* $Revision: 1.2 $
*
* wildmat.c - simple regular expression pattern matching routines
*
* DESCRIPTION
*
* These routines provide simple UNIX style regular expression matching.
* They were originally written by Rich Salz, the comp.sources.unix
* moderator for inclusion in some of his software. These routines
* were released into the public domain and used by John Gilmore in
* USTAR.
*
* AUTHORS
*
* Mark H. Colburn, NAPS International (mark@jhereg.mn.org)
* John Gilmore (gnu@hoptoad)
* Rich Salz (rs@uunet.uu.net)
*
*
* Sponsored by The USENIX Association for public distribution.
*
* Copyright (c) 1989 Mark H. Colburn.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice is duplicated in all such
* forms and that any documentation, advertising materials, and other
* materials related to such distribution and use acknowledge that the
* software was developed * by Mark H. Colburn and sponsored by The
* USENIX Association.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $Log: wildmat.c,v $
* Revision 1.2 89/02/12 10:06:20 mark
* 1.2 release fixes
*
* Revision 1.1 88/12/23 18:02:41 mark
* Initial revision
*
*/
#ifndef lint
static char *ident = "$Id: wildmat.c,v 1.2 89/02/12 10:06:20 mark Exp $";
static char *copyright = "Copyright (c) 1989 Mark H. Colburn.\nAll rights reserved.\n";
#endif /* ! lint */
/* Headers */
#include "pax.h"
/* Function Prototypes */
#ifdef __STDC__
static int star(char *, char *);
#else /* !__STDC__ */
static int star();
#endif /* __STDC__ */
/*
* star - handle trailing * in a regular expression
*
* DESCRIPTION
*
* Star is used to match filename expansions containing a trailing
* asterisk ('*'). Star call wildmat() to determine if the substring
* passed to it is matches the regular expression.
*
* PARAMETERS
*
* char *source - The source string which is to be compared to the
* regular expression pattern.
* char *pattern - The regular expression which we are supposed to
* match to.
*
* RETURNS
*
* Returns non-zero if the entire source string is completely matched by
* the regular expression pattern, returns 0 otherwise. This is used to
* see if *'s in a pattern matched the entire source string.
*
*/
#ifdef __STDC__
static int star(char *source, char *pattern)
#else
static int star(source, pattern)
char *source; /* source operand */
char *pattern; /* regular expression to match */
#endif
{
while (!wildmat(pattern, source)) {
if (*++source == '\0') {
return (0);
}
}
return (1);
}
/*
* wildmat - match a regular expression
*
* DESCRIPTION
*
* Wildmat attempts to match the string pointed to by source to the
* regular expression pointed to by pattern. The subset of regular
* expression syntax which is supported is defined by POSIX P1003.2
* FILENAME EXPANSION rules.
*
* PARAMETERS
*
* char *pattern - The regular expression which we are supposed to
* match to.
* char *source - The source string which is to be compared to the
* regular expression pattern.
*
* RETURNS
*
* Returns non-zero if the source string matches the regular expression
* pattern specified, returns 0 otherwise.
*
*/
#ifdef __STDC__
int wildmat(char *pattern, char *source)
#else
int wildmat(pattern, source)
char *pattern; /* regular expression to match */
char *source; /* source operand */
#endif
{
int last; /* last character matched */
int matched; /* !0 if a match occurred */
int reverse; /* !0 if sense of match is reversed */
for (; *pattern; source++, pattern++) {
switch (*pattern) {
case '\\':
/* Literal match with following character */
pattern++;
/* FALLTHRU */
default:
if (*source != *pattern) {
return (0);
}
continue;
case '?':
/* Match anything. */
if (*source == '\0') {
return (0);
}
continue;
case '*':
/* Trailing star matches everything. */
return (*++pattern ? star(source, pattern) : 1);
case '[':
/* [^....] means inverse character class. */
if (reverse = pattern[1] == '^') {
pattern++;
}
for (last = 0400, matched = 0;
*++pattern && *pattern != ']'; last = *pattern) {
/* This next line requires a good C compiler. */
if (*pattern == '-'
? *source <= *++pattern && *source >= last
: *source == *pattern) {
matched = 1;
}
}
if (matched == reverse) {
return (0);
}
continue;
}
}
/*
* For "tar" use, matches that end at a slash also work. --hoptoad!gnu
*/
return (*source == '\0' || *source == '/');
}