iconv/iconv.c

   1 /* Convert characters in input buffer using conversion descriptor to
   2    output buffer.
   3    Copyright (C) 1997, 1998 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Library General Public License as
   9    published by the Free Software Foundation; either version 2 of the
  10    License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Library General Public License for more details.
  16
  17    You should have received a copy of the GNU Library General Public
  18    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  19    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include <errno.h>
  23 #include <iconv.h>
  24
  25 #include <gconv_int.h>
  26
  27 #include <assert.h>
  28
  29
  30 size_t
  31 iconv (iconv_t cd, const char **inbuf, size_t *inbytesleft, char **outbuf,
  32        size_t *outbytesleft)
  33 {
  34   gconv_t gcd = (gconv_t) cd;
  35   char *outstart = outbuf ? *outbuf : NULL;
  36   size_t converted;
  37   int result;
  38
  39   if (inbuf == NULL || *inbuf == NULL)
  40     {
  41       result = __gconv (gcd, NULL, NULL, outbuf, outstart + *outbytesleft,
  42                         &converted);
  43     }
  44   else
  45     {
  46       const char *instart = *inbuf;
  47
  48       result = __gconv (gcd, inbuf, *inbuf + *inbytesleft, outbuf,
  49                         *outbuf + *outbytesleft, &converted);
  50
  51       *inbytesleft -= *inbuf - instart;
  52     }
  53   if (outstart != NULL)
  54     *outbytesleft -= *outbuf - outstart;
  55
  56   switch (result)
  57     {
  58     case GCONV_ILLEGAL_DESCRIPTOR:
  59       __set_errno (EBADF);
  60       converted = (size_t) -1L;
  61       break;
  62
  63     case GCONV_ILLEGAL_INPUT:
  64       __set_errno (EILSEQ);
  65       converted = (size_t) -1L;
  66       break;
  67
  68     case GCONV_FULL_OUTPUT:
  69       __set_errno (E2BIG);
  70       converted = (size_t) -1L;
  71       break;
  72
  73     case GCONV_INCOMPLETE_INPUT:
  74       __set_errno (EINVAL);
  75       converted = (size_t) -1L;
  76       break;
  77
  78     case GCONV_EMPTY_INPUT:
  79     case GCONV_OK:
  80       /* Nothing.  */
  81       break;
  82
  83     default:
  84       assert (!"Nothing like this should happen");
  85     }
  86
  87   return converted;
  88 }