src/iconv_encode_wchar.c

   1 /* This file is part of the YAZ toolkit.
   2  * Copyright (C) 1995-2013 Index Data
   3  * See the file LICENSE for details.
   4  */
   5 /**
   6  * \file
   7  * \brief WCHAR_T iconv encoding / decoding
   8  */
   9
  10 #if HAVE_CONFIG_H
  11 #include <config.h>
  12 #endif
  13
  14 #include <assert.h>
  15 #include <errno.h>
  16 #include <string.h>
  17 #if HAVE_WCHAR_H
  18 #include <wchar.h>
  19 #endif
  20
  21 #include <yaz/xmalloc.h>
  22 #include "iconv-p.h"
  23
  24 struct encoder_data
  25 {
  26     unsigned long compose_char;
  27 };
  28
  29 #if HAVE_WCHAR_H
  30 static size_t write_wchar_t(yaz_iconv_t cd, yaz_iconv_encoder_t en,
  31                             unsigned long x,
  32                             char **outbuf, size_t *outbytesleft)
  33 {
  34     unsigned char *outp = (unsigned char *) *outbuf;
  35
  36     if (*outbytesleft >= sizeof(wchar_t))
  37     {
  38         wchar_t wch = x;
  39         memcpy(outp, &wch, sizeof(wch));
  40         outp += sizeof(wch);
  41         (*outbytesleft) -= sizeof(wch);
  42     }
  43     else
  44     {
  45         yaz_iconv_set_errno(cd, YAZ_ICONV_E2BIG);
  46         return (size_t)(-1);
  47     }
  48     *outbuf = (char *) outp;
  49     return 0;
  50 }
  51 #endif
  52
  53 yaz_iconv_encoder_t yaz_wchar_encoder(const char *tocode,
  54                                       yaz_iconv_encoder_t e)
  55
  56 {
  57 #if HAVE_WCHAR_H
  58     if (!yaz_matchstr(tocode, "wchar_t"))
  59     {
  60         e->write_handle = write_wchar_t;
  61         return e;
  62     }
  63 #endif
  64     return 0;
  65 }
  66
  67 #if HAVE_WCHAR_H
  68 static unsigned long read_wchar_t(yaz_iconv_t cd, yaz_iconv_decoder_t d,
  69                                   unsigned char *inp,
  70                                   size_t inbytesleft, size_t *no_read)
  71 {
  72     unsigned long x = 0;
  73
  74     if (inbytesleft < sizeof(wchar_t))
  75     {
  76         yaz_iconv_set_errno(cd, YAZ_ICONV_EINVAL); /* incomplete input */
  77         *no_read = 0;
  78     }
  79     else
  80     {
  81         wchar_t wch;
  82         memcpy(&wch, inp, sizeof(wch));
  83         x = wch;
  84         *no_read = sizeof(wch);
  85     }
  86     return x;
  87 }
  88 #endif
  89
  90 yaz_iconv_decoder_t yaz_wchar_decoder(const char *fromcode,
  91                                       yaz_iconv_decoder_t d)
  92
  93 {
  94 #if HAVE_WCHAR_H
  95     if (!yaz_matchstr(fromcode, "wchar_t"))
  96     {
  97         d->read_handle = read_wchar_t;
  98         return d;
  99     }
 100 #endif
 101     return 0;
 102 }
 103
 104
 105 /*
 106  * Local variables:
 107  * c-basic-offset: 4
 108  * c-file-style: "Stroustrup"
 109  * indent-tabs-mode: nil
 110  * End:
 111  * vim: shiftwidth=4 tabstop=8 expandtab
 112  */
 113