usr/src/lib/libldap5/sources/ldap/common/unescape.c

   1 #pragma ident   "%Z%%M% %I%     %E% SMI"
   2
   3 /*
   4  * The contents of this file are subject to the Netscape Public
   5  * License Version 1.1 (the "License"); you may not use this file
   6  * except in compliance with the License. You may obtain a copy of
   7  * the License at http://www.mozilla.org/NPL/
   8  *
   9  * Software distributed under the License is distributed on an "AS
  10  * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
  11  * implied. See the License for the specific language governing
  12  * rights and limitations under the License.
  13  *
  14  * The Original Code is Mozilla Communicator client code, released
  15  * March 31, 1998.
  16  *
  17  * The Initial Developer of the Original Code is Netscape
  18  * Communications Corporation. Portions created by Netscape are
  19  * Copyright (C) 1998-1999 Netscape Communications Corporation. All
  20  * Rights Reserved.
  21  *
  22  * Contributor(s):
  23  */
  24
  25 /*
  26  *  LIBLDAP unescape.c -- LDAP URL un-escape routines
  27  *  We also tolerate URLs that look like: <ldapurl> and <URL:ldapurl>
  28  */
  29
  30 #include "ldap-int.h"
  31
  32
  33 static int unhex( char c );
  34
  35
  36 void
  37 nsldapi_hex_unescape( char *s )
  38 {
  39 /*
  40  * Remove URL hex escapes from s... done in place.  The basic concept for
  41  * this routine is borrowed from the WWW library HTUnEscape() routine.
  42  */
  43         char    *p;
  44
  45         for ( p = s; *s != '\0'; ++s ) {
  46                 if ( *s == '%' ) {
  47                         if ( *++s == '\0' ) {
  48                                 break;
  49                         }
  50                         *p = unhex( *s ) << 4;
  51                         if ( *++s == '\0' ) {
  52                                 break;
  53                         }
  54                         *p++ += unhex( *s );
  55
  56                 } else {
  57                         *p++ = *s;
  58                 }
  59         }
  60
  61         *p = '\0';
  62 }
  63
  64
  65 static int
  66 unhex( char c )
  67 {
  68         return( c >= '0' && c <= '9' ? c - '0'
  69             : c >= 'A' && c <= 'F' ? c - 'A' + 10
  70             : c - 'a' + 10 );
  71 }