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305 lines
7.9 KiB
C
305 lines
7.9 KiB
C
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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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/* *
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*
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*
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* shexp.c: shell-like wildcard match routines
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*
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* See shexp.h for public documentation.
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*
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* Rob McCool
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*
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*/
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#include "mkreg.h"
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#include "plstr.h"
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#include "prmem.h"
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/* ----------------------------- shexp_valid ------------------------------ */
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PRIVATE int
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_valid_subexp(char *exp, char stop)
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{
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register int x,y,t;
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int nsc,np,tld;
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x=0;nsc=0;tld=0;
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while(exp[x] && (exp[x] != stop)) {
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switch(exp[x]) {
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case '~':
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if(tld) return INVALID_SXP;
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else ++tld;
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case '*':
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case '?':
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case '^':
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case '$':
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++nsc;
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break;
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case '[':
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++nsc;
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if((!exp[++x]) || (exp[x] == ']'))
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return INVALID_SXP;
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for(++x;exp[x] && (exp[x] != ']');++x)
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if(exp[x] == '\\')
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if(!exp[++x])
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return INVALID_SXP;
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if(!exp[x])
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return INVALID_SXP;
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break;
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case '(':
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++nsc;np = 0;
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while(1) {
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if(exp[++x] == ')')
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return INVALID_SXP;
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for(y=x;(exp[y]) && (exp[y] != '|') && (exp[y] != ')');++y)
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if(exp[y] == '\\')
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if(!exp[++y])
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return INVALID_SXP;
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if(!exp[y])
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return INVALID_SXP;
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if(exp[y] == '|')
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++np;
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t = _valid_subexp(&exp[x],exp[y]);
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if(t == INVALID_SXP)
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return INVALID_SXP;
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x+=t;
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if(exp[x] == ')') {
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if(!np)
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return INVALID_SXP;
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break;
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}
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}
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break;
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case ')':
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case ']':
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return INVALID_SXP;
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case '\\':
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if(!exp[++x])
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return INVALID_SXP;
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default:
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break;
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}
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++x;
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}
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if((!stop) && (!nsc))
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return NON_SXP;
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return ((exp[x] == stop) ? x : INVALID_SXP);
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}
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PUBLIC int
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NET_RegExpValid(char *exp)
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{
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int x;
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x = _valid_subexp(exp, '\0');
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return (x < 0 ? x : VALID_SXP);
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}
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/* ----------------------------- shexp_match ----------------------------- */
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#define MATCH 0
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#define NOMATCH 1
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#define ABORTED -1
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PRIVATE int _shexp_match(char *str, char *exp, Bool case_insensitive);
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PRIVATE int
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_handle_union(char *str, char *exp, Bool case_insensitive)
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{
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char *e2 = (char *) PR_Malloc(sizeof(char)*strlen(exp));
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register int t,p2,p1 = 1;
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int cp;
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while(1) {
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for(cp=1;exp[cp] != ')';cp++)
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if(exp[cp] == '\\')
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++cp;
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for(p2 = 0;(exp[p1] != '|') && (p1 != cp);p1++,p2++) {
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if(exp[p1] == '\\')
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e2[p2++] = exp[p1++];
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e2[p2] = exp[p1];
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}
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for (t=cp+1; ((e2[p2] = exp[t]) != 0); ++t,++p2) {}
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if(_shexp_match(str,e2, case_insensitive) == MATCH) {
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PR_Free(e2);
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return MATCH;
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}
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if(p1 == cp) {
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PR_Free(e2);
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return NOMATCH;
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}
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else ++p1;
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}
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}
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PRIVATE int
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_shexp_match(char *str, char *exp, Bool case_insensitive)
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{
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register int x,y;
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int ret,neg;
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ret = 0;
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for(x=0,y=0;exp[y];++y,++x) {
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if((!str[x]) && (exp[y] != '(') && (exp[y] != '$') && (exp[y] != '*'))
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ret = ABORTED;
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else {
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switch(exp[y]) {
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case '$':
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if( (str[x]) )
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ret = NOMATCH;
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else
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--x; /* we don't want loop to increment x */
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break;
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case '*':
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while(exp[++y] == '*'){}
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if(!exp[y])
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return MATCH;
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while(str[x]) {
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switch(_shexp_match(&str[x++],&exp[y], case_insensitive)) {
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case NOMATCH:
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continue;
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case ABORTED:
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ret = ABORTED;
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break;
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default:
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return MATCH;
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}
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break;
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}
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if((exp[y] == '$') && (exp[y+1] == '\0') && (!str[x]))
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return MATCH;
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else
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ret = ABORTED;
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break;
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case '[':
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neg = ((exp[++y] == '^') && (exp[y+1] != ']'));
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if (neg)
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++y;
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if ((isalnum(exp[y])) && (exp[y+1] == '-') &&
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(isalnum(exp[y+2])) && (exp[y+3] == ']'))
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{
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int start = exp[y], end = exp[y+2];
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/* Droolproofing for pinheads not included */
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if(neg ^ ((str[x] < start) || (str[x] > end))) {
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ret = NOMATCH;
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break;
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}
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y+=3;
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}
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else {
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int matched;
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for (matched=0;exp[y] != ']';y++)
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matched |= (str[x] == exp[y]);
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if (neg ^ (!matched))
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ret = NOMATCH;
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}
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break;
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case '(':
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return _handle_union(&str[x],&exp[y], case_insensitive);
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break;
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case '?':
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break;
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case '\\':
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++y;
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default:
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if(case_insensitive)
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{
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if(toupper(str[x]) != toupper(exp[y]))
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ret = NOMATCH;
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}
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else
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{
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if(str[x] != exp[y])
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ret = NOMATCH;
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}
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break;
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}
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}
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if(ret)
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break;
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}
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return (ret ? ret : (str[x] ? NOMATCH : MATCH));
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}
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PUBLIC int
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NET_RegExpMatch(char *str, char *xp, Bool case_insensitive) {
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register int x;
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char *exp = PL_strdup(xp);
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if(!exp)
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return 1;
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for(x=strlen(exp)-1;x;--x) {
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if((exp[x] == '~') && (exp[x-1] != '\\')) {
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exp[x] = '\0';
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if(_shexp_match(str,&exp[++x], case_insensitive) == MATCH)
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goto punt;
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break;
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}
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}
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if(_shexp_match(str,exp, FALSE) == MATCH) {
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PR_Free(exp);
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return 0;
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}
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punt:
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PR_Free(exp);
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return 1;
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}
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/* ------------------------------ shexp_cmp ------------------------------- */
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PUBLIC int
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NET_RegExpSearch(char *str, char *exp)
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{
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switch(NET_RegExpValid(exp))
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{
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case INVALID_SXP:
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return -1;
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case NON_SXP:
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return (strcmp(exp,str) ? 1 : 0);
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default:
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return NET_RegExpMatch(str, exp, FALSE);
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}
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}
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PUBLIC int
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NET_RegExpCaseSearch(char *str, char *exp)
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{
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switch(NET_RegExpValid(exp))
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{
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case INVALID_SXP:
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return -1;
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case NON_SXP:
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return (strcmp(exp,str) ? 1 : 0);
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default:
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return NET_RegExpMatch(str, exp, TRUE);
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}
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}
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