px4-firmware/nuttx/libc/misc/lib_match.c

149 lines
4.4 KiB
C

/****************************************************************************
* libc/misc/lib_match.c - simple shell-style filename matcher
*
* Simple shell-style filename pattern matcher written by Jef Poskanzer
* This pattern matcher only handles '?', '*' and '**', and multiple
* patterns separated by '|'.
*
* Copyright © 1995,2000 by Jef Poskanzer <jef@mail.acme.com>.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <string.h>
#include <nuttx/regex.h>
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: match_one
*
* Description:
* Does all of the work for one '|' delimited pattern
*
* Returned Value:
* Returns 1 (match) or 0 (no-match).
*
****************************************************************************/
static int match_one(const char *pattern, int patlen, const char *string)
{
const char *p;
int pl;
int i;
for (p = pattern; p - pattern < patlen; p++, string++)
{
if (*p == '?' && *string != '\0')
{
continue;
}
if (*p == '*')
{
p++;
if (*p == '*')
{
/* Double-wildcard matches anything. */
p++;
i = strlen(string);
}
else
{
/* Single-wildcard matches anything but slash. */
i = strcspn(string, "/");
}
pl = patlen - (p - pattern);
for (; i >= 0; i--)
{
if (match_one(p, pl, &(string[i])))
{
return 1;
}
}
return 0;
}
if (*p != *string)
{
return 0;
}
}
if (*string == '\0')
{
return 1;
}
return 0;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: match
*
* Description:
* Simple shell-style filename pattern matcher written by Jef Poskanzer
* This pattern matcher only handles '?', '*' and '**', and multiple
* patterns separated by '|'.
*
* Returned Value:
* Returns 1 (match) or 0 (no-match).
*
****************************************************************************/
int match(const char *pattern, const char *string)
{
const char *or;
for (;;)
{
or = strchr(pattern, '|');
if (or == (char *)0)
{
return match_one(pattern, strlen(pattern), string);
}
if (match_one(pattern, or - pattern, string))
{
return 1;
}
pattern = or + 1;
}
}