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/* Wildcard matching routines.
Copyright (C) 1988 Free Software Foundation
This file is part of GNU Tar.
GNU Tar is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.
GNU Tar is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Tar; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/*
* @(#)wildmat.c 1.3 87/11/06
*
From: rs@mirror.TMC.COM (Rich Salz)
Newsgroups: net.sources
Subject: Small shell-style pattern matcher
Message-ID: <596@mirror.TMC.COM>
Date: 27 Nov 86 00:06:40 GMT
There have been several regular-expression subroutines and one or two
filename-globbing routines in mod.sources. They handle lots of
complicated patterns. This small piece of code handles the *?[]\
wildcard characters the way the standard Unix(tm) shells do, with the
addition that "[^.....]" is an inverse character class -- it matches
any character not in the range ".....". Read the comments for more
info.
For my application, I had first ripped off a copy of the "glob" routine
from within the find source, but that code is bad news: it recurses
on every character in the pattern. I'm putting this replacement in the
public domain. It's small, tight, and iterative. Compile with -DTEST
to get a test driver. After you're convinced it works, install in
whatever way is appropriate for you.
I would like to hear of bugs, but am not interested in additions; if I
were, I'd use the code I mentioned above.
*/
/*
** Do shell-style pattern matching for ?, \, [], and * characters.
** Might not be robust in face of malformed patterns; e.g., "foo[a-"
** could cause a segmentation violation.
**
** Written by Rich $alz, mirror!rs, Wed Nov 26 19:03:17 EST 1986.
*/
/*
* Modified 6Nov87 by John Gilmore (hoptoad!gnu) to return a "match"
* if the pattern is immediately followed by a "/", as well as \0.
* This matches what "tar" does for matching whole subdirectories.
*
* The "*" code could be sped up by only recursing one level instead
* of two for each trial pattern, perhaps, and not recursing at all
* if a literal match of the next 2 chars would fail.
*/
#define TRUE 1
#define FALSE 0
static int
Star(s, p)
register char *s;
register char *p;
{
while (wildmat(s, p) == FALSE)
if (*++s == '\0')
return(FALSE);
return(TRUE);
}
int
wildmat(s, p)
register char *s;
register char *p;
{
register int last;
register int matched;
register int reverse;
for ( ; *p; s++, p++)
switch (*p) {
case '\\':
/* Literal match with following character; fall through. */
p++;
default:
if (*s != *p)
return(FALSE);
continue;
case '?':
/* Match anything. */
if (*s == '\0')
return(FALSE);
continue;
case '*':
/* Trailing star matches everything. */
return(*++p ? Star(s, p) : TRUE);
case '[':
/* [^....] means inverse character class. */
if (reverse = p[1] == '^')
p++;
for (last = 0400, matched = FALSE; *++p && *p != ']'; last = *p)
/* This next line requires a good C compiler. */
if (*p == '-' ? *s <= *++p && *s >= last : *s == *p)
matched = TRUE;
if (matched == reverse)
return(FALSE);
continue;
}
/* For "tar" use, matches that end at a slash also work. --hoptoad!gnu */
return(*s == '\0' || *s == '/');
}
#ifdef TEST
#include <stdio.h>
extern char *gets();
main()
{
char pattern[80];
char text[80];
while (TRUE) {
printf("Enter pattern: ");
if (gets(pattern) == NULL)
break;
while (TRUE) {
printf("Enter text: ");
if (gets(text) == NULL)
exit(0);
if (text[0] == '\0')
/* Blank line; go back and get a new pattern. */
break;
printf(" %d\n", wildmat(text, pattern));
}
}
exit(0);
}
#endif /* TEST */
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