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- neues Modul "match" begonnen.
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Alexander Barton
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src/ngircd/match.c
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254
src/ngircd/match.c
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/*
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* ngIRCd -- The Next Generation IRC Daemon
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* Copyright (c)2001,2002 by Alexander Barton (alex@barton.de)
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*
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* Dieses Programm ist freie Software. Sie koennen es unter den Bedingungen
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* der GNU General Public License (GPL), wie von der Free Software Foundation
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* herausgegeben, weitergeben und/oder modifizieren, entweder unter Version 2
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* der Lizenz oder (wenn Sie es wuenschen) jeder spaeteren Version.
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* Naehere Informationen entnehmen Sie bitter der Datei COPYING. Eine Liste
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* der an ngIRCd beteiligten Autoren finden Sie in der Datei AUTHORS.
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*
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* $Id: match.c,v 1.1 2002/06/26 15:42:58 alex Exp $
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*
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* match.c: Wildcard Pattern Matching
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*/
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#include "portab.h"
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#include "imp.h"
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#include <assert.h>
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#include <string.h>
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#include "exp.h"
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#include "match.h"
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/*
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* Die Pattern-Matching-Funkionen [Matche(), Matche_After_Star()] basieren
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* auf Versionen von J. Kercheval. Die Version 1.1 wurde am 12.03.1991 als
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* "public domain" freigegeben:
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* <http://www.snippets.org/snippets/portable/MATCH+C.php3>
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*/
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LOCAL INT Matche PARAMS(( REGISTER CHAR *p, REGISTER CHAR *t ));
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LOCAL INT Matche_After_Star PARAMS(( REGISTER CHAR *p, REGISTER CHAR *t ));
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#define MATCH_PATTERN 6 /* bad pattern */
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#define MATCH_LITERAL 5 /* match failure on literal match */
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#define MATCH_RANGE 4 /* match failure on [..] construct */
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#define MATCH_ABORT 3 /* premature end of text string */
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#define MATCH_END 2 /* premature end of pattern string */
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#define MATCH_VALID 1 /* valid match */
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GLOBAL BOOLEAN
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Match( CHAR *Pattern, CHAR *String )
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{
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/* Pattern mit String vergleichen */
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if( Matche( Pattern, String ) == MATCH_VALID ) return TRUE;
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else return FALSE;
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} /* Match */
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LOCAL INT
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Matche( REGISTER CHAR *p, REGISTER CHAR *t )
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{
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REGISTER CHAR range_start, range_end;
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BOOLEAN invert;
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BOOLEAN member_match;
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BOOLEAN loop;
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for( ; *p; p++, t++ )
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{
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/* if this is the end of the text then this is the end of the match */
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if( ! *t )
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{
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return ( *p == '*' && *++p == '\0' ) ? MATCH_VALID : MATCH_ABORT;
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}
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/* determine and react to pattern type */
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switch( *p )
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{
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case '?': /* single any character match */
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break;
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case '*': /* multiple any character match */
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return Matche_After_Star( p, t );
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case '[': /* [..] construct, single member/exclusion character match */
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/* move to beginning of range */
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p++;
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/* check if this is a member match or exclusion match */
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invert = FALSE;
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if( *p == '!' || *p == '^' )
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{
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invert = TRUE;
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p++;
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}
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/* if closing bracket here or at range start then we have a malformed pattern */
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if ( *p == ']' ) return MATCH_PATTERN;
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member_match = FALSE;
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loop = TRUE;
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while( loop )
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{
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/* if end of construct then loop is done */
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if( *p == ']' )
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{
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loop = FALSE;
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continue;
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}
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/* matching a '!', '^', '-', '\' or a ']' */
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if( *p == '\\' ) range_start = range_end = *++p;
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else range_start = range_end = *p;
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/* if end of pattern then bad pattern (Missing ']') */
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if( ! *p ) return MATCH_PATTERN;
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/* check for range bar */
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if( *++p == '-' )
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{
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/* get the range end */
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range_end = *++p;
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/* if end of pattern or construct then bad pattern */
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if( range_end == '\0' || range_end == ']' ) return MATCH_PATTERN;
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/* special character range end */
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if( range_end == '\\' )
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{
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range_end = *++p;
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/* if end of text then we have a bad pattern */
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if ( ! range_end ) return MATCH_PATTERN;
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}
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/* move just beyond this range */
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p++;
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}
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/* if the text character is in range then match found. make sure the range
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* letters have the proper relationship to one another before comparison */
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if( range_start < range_end )
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{
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if( *t >= range_start && *t <= range_end )
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{
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member_match = TRUE;
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loop = FALSE;
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}
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}
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else
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{
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if( *t >= range_end && *t <= range_start )
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{
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member_match = TRUE;
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loop = FALSE;
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}
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}
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}
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/* if there was a match in an exclusion set then no match */
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/* if there was no match in a member set then no match */
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if(( invert && member_match ) || ! ( invert || member_match )) return MATCH_RANGE;
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/* if this is not an exclusion then skip the rest of the [...]
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* construct that already matched. */
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if( member_match )
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{
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while( *p != ']' )
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{
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/* bad pattern (Missing ']') */
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if( ! *p ) return MATCH_PATTERN;
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/* skip exact match */
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if( *p == '\\' )
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{
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p++;
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/* if end of text then we have a bad pattern */
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if( ! *p ) return MATCH_PATTERN;
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}
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/* move to next pattern char */
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p++;
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}
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}
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break;
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case '\\': /* next character is quoted and must match exactly */
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/* move pattern pointer to quoted char and fall through */
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p++;
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/* if end of text then we have a bad pattern */
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if( ! *p ) return MATCH_PATTERN;
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/* must match this character exactly */
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default:
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if( *p != *t ) return MATCH_LITERAL;
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}
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}
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/* if end of text not reached then the pattern fails */
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if( *t ) return MATCH_END;
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else return MATCH_VALID;
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} /* Matche */
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LOCAL INT
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Matche_After_Star( REGISTER CHAR *p, REGISTER CHAR *t )
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{
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REGISTER INT nextp, match = 0;
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/* pass over existing ? and * in pattern */
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while( *p == '?' || *p == '*' )
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{
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/* take one char for each ? and + */
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if (*p == '?')
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{
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/* if end of text then no match */
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if( ! *t++ ) return MATCH_ABORT;
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}
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/* move to next char in pattern */
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p++;
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}
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/* if end of pattern we have matched regardless of text left */
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if( ! *p ) return MATCH_VALID;
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/* get the next character to match which must be a literal or '[' */
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nextp = *p;
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if( nextp == '\\' )
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{
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nextp = p[1];
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/* if end of text then we have a bad pattern */
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if( ! nextp ) return MATCH_PATTERN;
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}
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/* Continue until we run out of text or definite result seen */
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do
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{
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/* a precondition for matching is that the next character
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* in the pattern match the next character in the text or that
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* the next pattern char is the beginning of a range. Increment
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* text pointer as we go here */
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if( nextp == *t || nextp == '[' ) match = Matche( p, t );
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/* if the end of text is reached then no match */
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if( ! *t++ ) match = MATCH_ABORT;
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} while( match != MATCH_VALID && match != MATCH_ABORT && match != MATCH_PATTERN );
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/* return result */
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return match;
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} /* Matche_After_Star */
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/* -eof- */
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28
src/ngircd/match.h
Normal file
28
src/ngircd/match.h
Normal file
@ -0,0 +1,28 @@
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/*
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* ngIRCd -- The Next Generation IRC Daemon
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* Copyright (c)2001,2002 by Alexander Barton (alex@barton.de)
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*
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* Dieses Programm ist freie Software. Sie koennen es unter den Bedingungen
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* der GNU General Public License (GPL), wie von der Free Software Foundation
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* herausgegeben, weitergeben und/oder modifizieren, entweder unter Version 2
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* der Lizenz oder (wenn Sie es wuenschen) jeder spaeteren Version.
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* Naehere Informationen entnehmen Sie bitter der Datei COPYING. Eine Liste
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* der an ngIRCd beteiligten Autoren finden Sie in der Datei AUTHORS.
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*
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* $Id: match.h,v 1.1 2002/06/26 15:42:58 alex Exp $
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*
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* match.h: Wildcard Pattern Matching (Header)
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*/
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#ifndef __match_h__
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#define __match_h__
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GLOBAL BOOLEAN Match PARAMS(( CHAR *Pattern, CHAR *String ));
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#endif
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/* -eof- */
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