newlib/libc/iconv/lib/nullconv.c

   1 /*
   2  * Copyright (c) 2003-2004, Artem B. Bityuckiy
   3  * Copyright (c) 1999,2000, Konstantin Chuguev. All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26 #include <_ansi.h>
  27 #include <reent.h>
  28 #include <sys/types.h>
  29 #include <errno.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include "local.h"
  33 #include "conv.h"
  34
  35 static int null_conversion_dummy_data;
  36
  37
  38 static void *
  39 null_conversion_open (struct _reent *rptr,
  40                              const char *to,
  41                              const char *from)
  42 {
  43   return (void *)&null_conversion_dummy_data;
  44 }
  45
  46
  47 static size_t
  48 null_conversion_close (struct _reent *rptr,
  49                               void *data)
  50 {
  51   return 0;
  52 }
  53
  54
  55 static size_t
  56 null_conversion_convert (struct _reent *rptr,
  57                      void *data,
  58                      const unsigned char **inbuf,
  59                      size_t *inbytesleft,
  60                      unsigned char **outbuf,
  61                      size_t *outbytesleft,
  62                      int flags)
  63 {
  64   size_t result;
  65   size_t len;
  66
  67   if (*inbytesleft < *outbytesleft)
  68     {
  69       result = 0;
  70       len = *inbytesleft;
  71     }
  72   else
  73     {
  74       result = (size_t)-1;
  75       len = *outbytesleft;
  76       _REENT_ERRNO (rptr) = E2BIG;
  77     }
  78
  79   if ((flags & 1) == 0)
  80     memcpy (*outbuf, *inbuf, len);
  81
  82   *inbuf        += len;
  83   *outbuf       += len;
  84   *inbytesleft  -= len;
  85   *outbytesleft -= len;
  86
  87   return result;
  88 }
  89
  90
  91 static int
  92 null_conversion_get_mb_cur_max (void *data,
  93                                        int direction)
  94 {
  95   return ICONV_MB_LEN_MAX;
  96 }
  97
  98
  99 static void
 100 null_conversion_get_state (void *data,
 101                                   mbstate_t *state,
 102                                   int direction)
 103 {
 104   return;
 105 }
 106
 107
 108 static int
 109 null_conversion_set_state (void *data,
 110                                   mbstate_t *state,
 111                                   int direction)
 112 {
 113   return 0;
 114 }
 115
 116 static int
 117 null_conversion_is_stateful (void *data,
 118                                     int direction)
 119 {
 120   return 0;
 121 }
 122
 123 /* Null conversion definition object */
 124 const iconv_conversion_handlers_t
 125 _iconv_null_conversion_handlers =
 126 {
 127   null_conversion_open,
 128   null_conversion_close,
 129   null_conversion_convert,
 130   null_conversion_get_state,
 131   null_conversion_set_state,
 132   null_conversion_get_mb_cur_max,
 133   null_conversion_is_stateful
 134 };
 135