iconv/gconv.c

   1 /* Convert characters in input buffer using conversion descriptor to
   2    output buffer.
   3    Copyright (C) 1997-2001, 2005, 2007 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 Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the 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    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, write to the Free
  19    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  20    02111-1307 USA.  */
  21
  22 #include <assert.h>
  23 #include <dlfcn.h>
  24 #include <stddef.h>
  25 #include <sys/param.h>
  26
  27 #include <gconv_int.h>
  28 #include <sysdep.h>
  29
  30
  31 int
  32 internal_function
  33 __gconv (__gconv_t cd, const unsigned char **inbuf,
  34          const unsigned char *inbufend, unsigned char **outbuf,
  35          unsigned char *outbufend, size_t *irreversible)
  36 {
  37   size_t last_step;
  38   int result;
  39
  40   if (cd == (__gconv_t) -1L)
  41     return __GCONV_ILLEGAL_DESCRIPTOR;
  42
  43   last_step = cd->__nsteps - 1;
  44
  45   assert (irreversible != NULL);
  46   *irreversible = 0;
  47
  48   cd->__data[last_step].__outbuf = outbuf != NULL ? *outbuf : NULL;
  49   cd->__data[last_step].__outbufend = outbufend;
  50
  51   __gconv_fct fct = cd->__steps->__fct;
  52 #ifdef PTR_DEMANGLE
  53   if (cd->__steps->__shlib_handle != NULL)
  54     PTR_DEMANGLE (fct);
  55 #endif
  56
  57   if (inbuf == NULL || *inbuf == NULL)
  58     {
  59       /* We just flush.  */
  60       result = DL_CALL_FCT (fct,
  61                             (cd->__steps, cd->__data, NULL, NULL, NULL,
  62                              irreversible,
  63                              cd->__data[last_step].__outbuf == NULL ? 2 : 1,
  64                              0));
  65
  66       /* If the flush was successful clear the rest of the state.  */
  67       if (result == __GCONV_OK)
  68         for (size_t cnt = 0; cnt <= last_step; ++cnt)
  69           cd->__data[cnt].__invocation_counter = 0;
  70     }
  71   else
  72     {
  73       const unsigned char *last_start;
  74
  75       assert (outbuf != NULL && *outbuf != NULL);
  76
  77       do
  78         {
  79           last_start = *inbuf;
  80           result = DL_CALL_FCT (fct,
  81                                 (cd->__steps, cd->__data, inbuf, inbufend,
  82                                  NULL, irreversible, 0, 0));
  83         }
  84       while (result == __GCONV_EMPTY_INPUT && last_start != *inbuf
  85              && *inbuf + cd->__steps->__min_needed_from <= inbufend);
  86     }
  87
  88   if (outbuf != NULL && *outbuf != NULL)
  89     *outbuf = cd->__data[last_step].__outbuf;
  90
  91   return result;
  92 }