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       1                 :             : /********************************************************************\
       2                 :             :  * gnc-xml-helper.h -- api for xml helpers                          *
       3                 :             :  *                                                                  *
       4                 :             :  * Copyright (C) 2001 James LewisMoss <dres@debian.org>             *
       5                 :             :  *                                                                  *
       6                 :             :  * This program is free software; you can redistribute it and/or    *
       7                 :             :  * modify it under the terms of the GNU General Public License as   *
       8                 :             :  * published by the Free Software Foundation; either version 2 of   *
       9                 :             :  * the License, or (at your option) any later version.              *
      10                 :             :  *                                                                  *
      11                 :             :  * This program is distributed in the hope that it will be useful,  *
      12                 :             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of   *
      13                 :             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the    *
      14                 :             :  * GNU General Public License for more details.                     *
      15                 :             :  *                                                                  *
      16                 :             :  * You should have received a copy of the GNU General Public License*
      17                 :             :  * along with this program; if not, contact:                        *
      18                 :             :  *                                                                  *
      19                 :             :  * Free Software Foundation           Voice:  +1-617-542-5942       *
      20                 :             :  * 51 Franklin Street, Fifth Floor    Fax:    +1-617-542-2652       *
      21                 :             :  * Boston, MA  02110-1301,  USA       gnu@gnu.org                   *
      22                 :             :  *                                                                  *
      23                 :             : \********************************************************************/
      24                 :             : #include <glib.h>
      25                 :             : 
      26                 :             : #include "gnc-xml-helper.h"
      27                 :             : 
      28                 :             : xmlChar*
      29                 :      138024 : checked_char_cast (gchar* val)
      30                 :             : {
      31                 :      138024 :     const int length = -1; /* Assumes val is null-terminated */
      32                 :             :     gchar* end;
      33                 :      138024 :     if (val == NULL) return NULL;
      34                 :             :     /* Replace any invalid UTF-8 characters with a sequence of '?' */
      35                 :      138024 :     while (!g_utf8_validate (val, length, (const gchar**) (&end)))
      36                 :           0 :         *end = '?';
      37                 :             :     /* Replace any invalid (for XML) control characters (everything < 0x20
      38                 :             :      * except \n, \t, and \r) with '?'. Technically we should replace
      39                 :             :      * these with a numeric entity, but that will blow up the libxml
      40                 :             :      * functions that expect raw text. It seems unlikely that anyone
      41                 :             :      * would use intentionally use one of these characters anyway.
      42                 :             :      */
      43                 :             : 
      44                 :     1380614 :     for (end = val; *end; ++end)
      45                 :     1242590 :         if (*end > 0 && *end < 0x20 && *end != 0x09 &&
      46                 :       63927 :             *end != 0x0a && *end != 0x0d)
      47                 :           1 :             *end = '?';
      48                 :      138024 :     return (xmlChar*) (val);
      49                 :             : }