portreg.c
上传用户:lyxiangda
上传日期:2007-01-12
资源大小:3042k
文件大小:9k
- /*
- * The contents of this file are subject to the Mozilla Public
- * License Version 1.1 (the "License"); you may not use this file
- * except in compliance with the License. You may obtain a copy of
- * the License at http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS
- * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
- * implied. See the License for the specific language governing
- * rights and limitations under the License.
- *
- * The Original Code is the Netscape security libraries.
- *
- * The Initial Developer of the Original Code is Netscape
- * Communications Corporation. Portions created by Netscape are
- * Copyright (C) 1994-2000 Netscape Communications Corporation. All
- * Rights Reserved.
- *
- * Contributor(s):
- *
- * Alternatively, the contents of this file may be used under the
- * terms of the GNU General Public License Version 2 or later (the
- * "GPL"), in which case the provisions of the GPL are applicable
- * instead of those above. If you wish to allow use of your
- * version of this file only under the terms of the GPL and not to
- * allow others to use your version of this file under the MPL,
- * indicate your decision by deleting the provisions above and
- * replace them with the notice and other provisions required by
- * the GPL. If you do not delete the provisions above, a recipient
- * may use your version of this file under either the MPL or the
- * GPL.
- */
- /*
- * shexp.c: shell-like wildcard match routines
- *
- *
- * See shexp.h for public documentation.
- *
- */
- #include "seccomon.h"
- #include "portreg.h"
- /* ----------------------------- shexp_valid ------------------------------ */
- static int
- _valid_subexp(char *exp, char stop)
- {
- register int x,y,t;
- int nsc,np,tld;
- x=0;nsc=0;tld=0;
- while(exp[x] && (exp[x] != stop)) {
- switch(exp[x]) {
- case '~':
- if(tld) return INVALID_SXP;
- else ++tld;
- case '*':
- case '?':
- case '^':
- case '$':
- ++nsc;
- break;
- case '[':
- ++nsc;
- if((!exp[++x]) || (exp[x] == ']'))
- return INVALID_SXP;
- for(++x;exp[x] && (exp[x] != ']');++x)
- if(exp[x] == '\')
- if(!exp[++x])
- return INVALID_SXP;
- if(!exp[x])
- return INVALID_SXP;
- break;
- case '(':
- ++nsc;np = 0;
- while(1) {
- if(exp[++x] == ')')
- return INVALID_SXP;
- for(y=x;(exp[y]) && (exp[y] != '|') && (exp[y] != ')');++y)
- if(exp[y] == '\')
- if(!exp[++y])
- return INVALID_SXP;
- if(!exp[y])
- return INVALID_SXP;
- if(exp[y] == '|')
- ++np;
- t = _valid_subexp(&exp[x],exp[y]);
- if(t == INVALID_SXP)
- return INVALID_SXP;
- x+=t;
- if(exp[x] == ')') {
- if(!np)
- return INVALID_SXP;
- break;
- }
- }
- break;
- case ')':
- case ']':
- return INVALID_SXP;
- case '\':
- if(!exp[++x])
- return INVALID_SXP;
- default:
- break;
- }
- ++x;
- }
- if((!stop) && (!nsc))
- return NON_SXP;
- return ((exp[x] == stop) ? x : INVALID_SXP);
- }
- int
- PORT_RegExpValid(char *exp)
- {
- int x;
- x = _valid_subexp(exp, ' ');
- return (x < 0 ? x : VALID_SXP);
- }
- /* ----------------------------- shexp_match ----------------------------- */
- #define MATCH 0
- #define NOMATCH 1
- #define ABORTED -1
- static int _shexp_match(char *str, char *exp, PRBool case_insensitive);
- static int
- _handle_union(char *str, char *exp, PRBool case_insensitive)
- {
- char *e2 = (char *) PORT_Alloc(sizeof(char)*strlen(exp));
- register int t,p2,p1 = 1;
- int cp;
- while(1) {
- for(cp=1;exp[cp] != ')';cp++)
- if(exp[cp] == '\')
- ++cp;
- for(p2 = 0;(exp[p1] != '|') && (p1 != cp);p1++,p2++) {
- if(exp[p1] == '\')
- e2[p2++] = exp[p1++];
- e2[p2] = exp[p1];
- }
- for (t=cp+1; ((e2[p2] = exp[t]) != 0); ++t,++p2) {}
- if(_shexp_match(str,e2, case_insensitive) == MATCH) {
- PORT_Free(e2);
- return MATCH;
- }
- if(p1 == cp) {
- PORT_Free(e2);
- return NOMATCH;
- }
- else ++p1;
- }
- }
- static int
- _shexp_match(char *str, char *exp, PRBool case_insensitive)
- {
- register int x,y;
- int ret,neg;
- ret = 0;
- for(x=0,y=0;exp[y];++y,++x) {
- if((!str[x]) && (exp[y] != '(') && (exp[y] != '$') && (exp[y] != '*'))
- ret = ABORTED;
- else {
- switch(exp[y]) {
- case '$':
- if( (str[x]) )
- ret = NOMATCH;
- else
- --x; /* we don't want loop to increment x */
- break;
- case '*':
- while(exp[++y] == '*'){}
- if(!exp[y])
- return MATCH;
- while(str[x]) {
- switch(_shexp_match(&str[x++],&exp[y], case_insensitive)) {
- case NOMATCH:
- continue;
- case ABORTED:
- ret = ABORTED;
- break;
- default:
- return MATCH;
- }
- break;
- }
- if((exp[y] == '$') && (exp[y+1] == ' ') && (!str[x]))
- return MATCH;
- else
- ret = ABORTED;
- break;
- case '[':
- neg = ((exp[++y] == '^') && (exp[y+1] != ']'));
- if (neg)
- ++y;
-
- if ((isalnum(exp[y])) && (exp[y+1] == '-') &&
- (isalnum(exp[y+2])) && (exp[y+3] == ']'))
- {
- int start = exp[y], end = exp[y+2];
-
- /* no safeguards here */
- if(neg ^ ((str[x] < start) || (str[x] > end))) {
- ret = NOMATCH;
- break;
- }
- y+=3;
- }
- else {
- int matched;
-
- for (matched=0;exp[y] != ']';y++)
- matched |= (str[x] == exp[y]);
- if (neg ^ (!matched))
- ret = NOMATCH;
- }
- break;
- case '(':
- return _handle_union(&str[x],&exp[y], case_insensitive);
- break;
- case '?':
- break;
- case '\':
- ++y;
- default:
- if(case_insensitive)
- {
- if(toupper(str[x]) != toupper(exp[y]))
- ret = NOMATCH;
- }
- else
- {
- if(str[x] != exp[y])
- ret = NOMATCH;
- }
- break;
- }
- }
- if(ret)
- break;
- }
- return (ret ? ret : (str[x] ? NOMATCH : MATCH));
- }
- int
- PORT_RegExpMatch(char *str, char *xp, PRBool case_insensitive) {
- register int x;
- char *exp = 0;
- exp = PORT_Strdup(xp);
- if(!exp)
- return 1;
- for(x=strlen(exp)-1;x;--x) {
- if((exp[x] == '~') && (exp[x-1] != '\')) {
- exp[x] = ' ';
- if(_shexp_match(str,&exp[++x], case_insensitive) == MATCH)
- goto punt;
- break;
- }
- }
- if(_shexp_match(str,exp, PR_FALSE) == MATCH) {
- PORT_Free(exp);
- return 0;
- }
- punt:
- PORT_Free(exp);
- return 1;
- }
- /* ------------------------------ shexp_cmp ------------------------------- */
- int
- PORT_RegExpSearch(char *str, char *exp)
- {
- switch(PORT_RegExpValid(exp))
- {
- case INVALID_SXP:
- return -1;
- case NON_SXP:
- return (strcmp(exp,str) ? 1 : 0);
- default:
- return PORT_RegExpMatch(str, exp, PR_FALSE);
- }
- }
- int
- PORT_RegExpCaseSearch(char *str, char *exp)
- {
- switch(PORT_RegExpValid(exp))
- {
- case INVALID_SXP:
- return -1;
- case NON_SXP:
- return (strcmp(exp,str) ? 1 : 0);
- default:
- return PORT_RegExpMatch(str, exp, PR_TRUE);
- }
- }