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glob.c
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glob.c
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/* glob.c -- fast globbing routine using '*', '%', and '?'
*
* Copyright (c) 1994-2008 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any legal
* details, please contact
* Carnegie Mellon University
* Center for Technology Transfer and Enterprise Creation
* 4615 Forbes Avenue
* Suite 302
* Pittsburgh, PA 15213
* (412) 268-7393, fax: (412) 268-7395
* innovation@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Author: Chris Newman
* Start Date: 4/5/93
*/
#include <config.h>
#include <stdio.h>
#include <string.h>
#include "util.h"
#include "glob.h"
#include "xmalloc.h"
/* initialize globbing structure
* This makes the following changes to the input string:
* 1) '*' eats all '*'s and '%'s connected by any wildcard
* 2) '%' eats all adjacent '%'s
*/
EXPORTED glob *glob_init(const char *str, char sep)
{
struct buf buf = BUF_INITIALIZER;
buf_appendcstr(&buf, "(^");
while (*str) {
switch (*str) {
case '*':
case '%':
/* remove duplicate hierarchy match (2) */
while (*str == '%') ++str;
/* If we found a '*', treat '%' as '*' (1) */
if (*str == '*') {
/* remove duplicate wildcards (1) */
while (*str == '*' || (*str == '%' && str[1])) ++str;
buf_appendcstr(&buf, ".*");
}
else {
buf_appendcstr(&buf, "[^");
if (sep == '\\') buf_putc(&buf, '\\');
buf_putc(&buf, sep);
buf_appendcstr(&buf, "]*");
}
break;
/* http://stackoverflow.com/questions/399078/what-special-characters-must-be-escaped-in-regular-expressions
* In POSIX basic regular expressions (BRE), these are metacharacters
* that you need to escape to suppress their meaning:
* .^$*
* (and we're already handling * above)
* also discovered that prceposix will segfault if we don't escape +, ?, and of course \
*/
case '.':
case '^':
case '$':
case '+':
case '?':
case '(':
case ')':
case '[':
case ']':
case '\\':
buf_putc(&buf, '\\');
/* fall through */
default:
buf_putc(&buf, *str++);
break;
}
}
buf_appendcstr(&buf, ")([");
if (sep == '\\') buf_putc(&buf, '\\');
buf_putc(&buf, sep);
buf_appendcstr(&buf, "]|$)");
glob *g = xmalloc(sizeof(glob));
regcomp(&g->regex, buf_cstring(&buf), REG_EXTENDED);
buf_free(&buf);
return g;
}
/* free a glob structure
*/
EXPORTED void glob_free(glob **gp)
{
glob *g = *gp;
if (g) {
regfree(&g->regex);
free(g);
}
*gp = NULL;
}
/* returns -1 if no match, otherwise length of match or partial-match
* g pre-processed glob string
* ptr string to perform glob on
* len length of ptr string
* min pointer to minimum length of a valid partial-match
* set to return value + 1 on partial match, otherwise -1
* if NULL, partial matches not allowed
*/
EXPORTED int glob_test(glob *g, const char *str)
{
regmatch_t match[3];
if (regexec(&g->regex, str, 2, match, 0))
return -1;
return match[1].rm_eo;
}

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