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/*
* Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers.
* All rights reserved.
*
* By using this file, you agree to the terms and conditions set
* forth in the LICENSE file which can be found at the top level of
* the sendmail distribution.
*
*/
#include <sm/gen.h>
SM_RCSID("@(#)$Sendmail: match.c,v 1.10 2001/09/11 04:04:48 gshapiro Exp $")
#include <sm/string.h>
/*
** SM_MATCH -- Match a character string against a glob pattern.
**
** Parameters:
** str -- string.
** par -- pattern to find in str.
**
** Returns:
** true on match, false on non-match.
**
** A pattern consists of normal characters, which match themselves,
** and meta-sequences. A * matches any sequence of characters.
** A ? matches any single character. A [ introduces a character class.
** A ] marks the end of a character class; if the ] is missing then
** the [ matches itself rather than introducing a character class.
** A character class matches any of the characters between the brackets.
** The range of characters from X to Y inclusive is written X-Y.
** If the first character after the [ is ! then the character class is
** complemented.
**
** To include a ] in a character class, make it the first character
** listed (after the !, if any). To include a -, make it the first
** character listed (after the !, if any) or the last character.
** It is impossible for a ] to be the final character in a range.
** For glob patterns that literally match "*", "?" or "[",
** use [*], [?] or [[].
*/
bool
sm_match(str, pat)
const char *str;
const char *pat;
{
bool ccnot, ccmatch, ccfirst;
const char *ccstart;
char c, c2;
for (;;)
{
switch (*pat)
{
case '\0':
return *str == '\0';
case '?':
if (*str == '\0')
return false;
++pat;
++str;
continue;
case '*':
++pat;
if (*pat == '\0')
{
/* optimize case of trailing '*' */
return true;
}
for (;;)
{
if (sm_match(pat, str))
return true;
if (*str == '\0')
return false;
++str;
}
/* NOTREACHED */
case '[':
ccstart = pat++;
ccnot = false;
if (*pat == '!')
{
ccnot = true;
++pat;
}
ccmatch = false;
ccfirst = true;
for (;;)
{
if (*pat == '\0')
{
pat = ccstart;
goto defl;
}
if (*pat == ']' && !ccfirst)
break;
c = *pat++;
ccfirst = false;
if (*pat == '-' && pat[1] != ']')
{
++pat;
if (*pat == '\0')
{
pat = ccstart;
goto defl;
}
c2 = *pat++;
if (*str >= c && *str <= c2)
ccmatch = true;
}
else
{
if (*str == c)
ccmatch = true;
}
}
if (ccmatch ^ ccnot)
{
++pat;
++str;
}
else
return false;
continue;
default:
defl:
if (*pat != *str)
return false;
++pat;
++str;
continue;
}
}
}
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