1: /* Get descriptor for character set conversion.
    2:    Copyright (C) 1997,1998,1999,2000,2001,2007 Free Software Foundation, Inc.
    3:    This file is part of the GNU C Library.
    4:    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
    5: 
    6:    The GNU C Library is free software; you can redistribute it and/or
    7:    modify it under the terms of the GNU Lesser General Public
    8:    License as published by the Free Software Foundation; either
    9:    version 2.1 of the License, or (at your option) any later version.
   10: 
   11:    The GNU C Library 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 GNU
   14:    Lesser General Public License for more details.
   15: 
   16:    You should have received a copy of the GNU Lesser General Public
   17:    License along with the GNU C Library; if not, write to the Free
   18:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   19:    02111-1307 USA.  */
   20: 
   21: #include <alloca.h>
   22: #include <errno.h>
   23: #include <iconv.h>
   24: #include <stdbool.h>
   25: #include <stdlib.h>
   26: #include <string.h>
   27: 
   28: #include <gconv_int.h>
   29: #include "gconv_charset.h"
   30: 
   31: 
   32: iconv_t
   33: iconv_open (const char *tocode, const char *fromcode)
   34: {
   35:   /* Normalize the name.  We remove all characters beside alpha-numeric,
   36:      '_', '-', '/', '.', and ':'.  */
   37:   size_t tocode_len = strlen (tocode) + 3;
   38:   char *tocode_conv;
   39:   bool tocode_usealloca = __libc_use_alloca (tocode_len);
   40:   if (tocode_usealloca)
   41:     tocode_conv = (char *) alloca (tocode_len);
   42:   else
   43:     {
   44:       tocode_conv = (char *) malloc (tocode_len);
   45:       if (tocode_conv == NULL)
   46:         return (iconv_t) -1;
   47:     }
   48:   strip (tocode_conv, tocode);
   49:   tocode = (tocode_conv[2] == '\0' && tocode[0] != '\0'
   50:             ? upstr (tocode_conv, tocode) : tocode_conv);
   51: 
   52:   size_t fromcode_len = strlen (fromcode) + 3;
   53:   char *fromcode_conv;
   54:   bool fromcode_usealloca = __libc_use_alloca (fromcode_len);
   55:   if (fromcode_usealloca)
   56:     fromcode_conv = (char *) alloca (fromcode_len);
   57:   else
   58:     {
   59:       fromcode_conv = (char *) malloc (fromcode_len);
   60:       if (fromcode_conv == NULL)
   61:         {
   62:           if (! tocode_usealloca)
   63:             free (tocode_conv);
   64:           return (iconv_t) -1;
   65:         }
   66:     }
   67:   strip (fromcode_conv, fromcode);
   68:   fromcode = (fromcode_conv[2] == '\0' && fromcode[0] != '\0'
   69:               ? upstr (fromcode_conv, fromcode) : fromcode_conv);
   70: 
   71:   __gconv_t cd;
   72:   int res = __gconv_open (tocode, fromcode, &cd, 0);
   73: 
   74:   if (! fromcode_usealloca)
   75:     free (fromcode_conv);
   76:   if (! tocode_usealloca)
   77:     free (tocode_conv);
   78: 
   79:   if (__builtin_expect (res, __GCONV_OK) != __GCONV_OK)
   80:     {
   81:       /* We must set the error number according to the specs.  */
   82:       if (res == __GCONV_NOCONV || res == __GCONV_NODB)
   83:         __set_errno (EINVAL);
   84: 
   85:       cd = (iconv_t) -1;
   86:     }
   87: 
   88:   return (iconv_t) cd;
   89: }