iconv/gconv.c

   1 /* Convert characters in input buffer using conversion descriptor to
   2    output buffer.
   3    Copyright (C) 1997, 1998, 1999, 2000, 2001 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 <assert.h>
  23 #include <gconv_int.h>
  24 #include <sys/param.h>
  25 #include <dlfcn.h>
  26 #include <stddef.h>
  27
  28 int
  29 internal_function
  30 __gconv (__gconv_t cd, const unsigned char **inbuf,
  31          const unsigned char *inbufend, unsigned char **outbuf,
  32          unsigned char *outbufend, size_t *irreversible)
  33 {
  34   size_t last_step;
  35   int result;
  36
  37   if (cd == (__gconv_t) -1L)
  38     return __GCONV_ILLEGAL_DESCRIPTOR;
  39
  40   last_step = cd->__nsteps - 1;
  41
  42   assert (irreversible != NULL);
  43   *irreversible = 0;
  44
  45   cd->__data[last_step].__outbuf = outbuf != NULL ? *outbuf : NULL;
  46   cd->__data[last_step].__outbufend = outbufend;
  47
  48   if (inbuf == NULL || *inbuf == NULL)
  49     /* We just flush.  */
  50     result = DL_CALL_FCT (cd->__steps->__fct,
  51                           (cd->__steps, cd->__data, NULL, NULL, NULL,
  52                            irreversible,
  53                            cd->__data[last_step].__outbuf == NULL ? 2 : 1, 0));
  54   else
  55     {
  56       const unsigned char *last_start;
  57
  58       assert (outbuf != NULL && *outbuf != NULL);
  59
  60       do
  61         {
  62           last_start = *inbuf;
  63           result = DL_CALL_FCT (cd->__steps->__fct,
  64                                 (cd->__steps, cd->__data, inbuf, inbufend,
  65                                  NULL, irreversible, 0, 0));
  66         }
  67       while (result == __GCONV_EMPTY_INPUT && last_start != *inbuf
  68              && *inbuf + cd->__steps->__min_needed_from <= inbufend);
  69     }
  70
  71   if (outbuf != NULL && *outbuf != NULL)
  72     *outbuf = cd->__data[last_step].__outbuf;
  73
  74   return result;
  75 }