utf8_encode.c

   1 /*
   2  * Copyright 2004 Timo Hirvonen
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  17  * 02111-1307, USA.
  18  */
  19
  20 #include <utf8_encode.h>
  21 #include <xmalloc.h>
  22
  23 #include <iconv.h>
  24 #include <string.h>
  25 #include <errno.h>
  26
  27 int utf8_encode(const char *inbuf, const char *encoding, char **outbuf)
  28 {
  29         const char *in;
  30         char *out;
  31         size_t inbuf_size, outbuf_size, i;
  32         iconv_t cd;
  33         int rc;
  34
  35         cd = iconv_open("UTF-8", encoding);
  36         if (cd == (iconv_t)-1)
  37                 return -1;
  38         inbuf_size = strlen(inbuf);
  39         outbuf_size = inbuf_size;
  40         for (i = 0; i < inbuf_size; i++) {
  41                 unsigned char ch;
  42
  43                 ch = inbuf[i];
  44                 if (ch > 127)
  45                         outbuf_size++;
  46         }
  47         *outbuf = xnew(char, outbuf_size + 1);
  48         in = inbuf;
  49         out = *outbuf;
  50         rc = iconv(cd, (char **)&in, &inbuf_size, &out, &outbuf_size);
  51         *out = 0;
  52         if (rc == -1) {
  53                 int save = errno;
  54                 iconv_close(cd);
  55                 free(*outbuf);
  56                 *outbuf = NULL;
  57                 errno = save;
  58                 return -1;
  59         }
  60         rc = iconv_close(cd);
  61         if (rc == -1) {
  62                 int save = errno;
  63                 free(*outbuf);
  64                 *outbuf = NULL;
  65                 errno = save;
  66                 return -1;
  67         }
  68         return 0;
  69 }