libs/libiconv/src/iconv.c

   1 /*
   2  * Simple iconv library stub so that programs have something to link against
   3  */
   4
   5 #include <stddef.h>
   6 #include <string.h>
   7 #include <errno.h>
   8 #include <iconv.h>
   9
  10 int _libiconv_version = _LIBICONV_VERSION;
  11
  12 iconv_t iconv_open (const char *tocode, const char *fromcode)
  13 {
  14         /* ASCII -> UTF8 and ASCII -> ISO-8859-x mappings can be
  15          * faked without doing any actual conversion, mapping
  16          * between identical charsets is a no-op, so claim to
  17          * support those. */
  18         if (!strncasecmp(fromcode, tocode, strlen(fromcode)) ||
  19             (!strncasecmp(tocode,   "UTF-8",     strlen("UTF-8")) &&
  20              !strncasecmp(fromcode, "ASCII",     strlen("ASCII"))) ||
  21             (!strncasecmp(tocode,   "ISO-8859-", strlen("ISO-8859-")) &&
  22              !strncasecmp(fromcode, "ASCII",     strlen("ASCII"))))
  23         {
  24                 return (iconv_t)(1);
  25         }
  26         else
  27         {
  28                 return (iconv_t)(-1);
  29         }
  30 }
  31
  32 size_t iconv (iconv_t cd, char **inbuf, size_t *inbytesleft,
  33                           char **outbuf, size_t *outbytesleft)
  34 {
  35         size_t len = 0;
  36
  37         if (cd == (iconv_t)(1))
  38         {
  39                 if ((*inbytesleft < 0) || (*outbytesleft < 0) ||
  40                     (outbuf == NULL) || (*outbuf == NULL))
  41                 {
  42                         errno = EINVAL;
  43                         return (size_t)(-1);
  44                 }
  45
  46                 if ((inbuf != NULL) && (*inbuf != NULL))
  47                 {
  48                         len = (*inbytesleft > *outbytesleft)
  49                                 ? *outbytesleft : *inbytesleft;
  50
  51                         memcpy(*outbuf, *inbuf, len);
  52
  53                         *inbuf        += len;
  54                         *inbytesleft  -= len;
  55                         *outbuf       += len;
  56                         *outbytesleft -= len;
  57
  58                         if (*inbytesleft > 0)
  59                         {
  60                                 errno = E2BIG;
  61                                 return (size_t)(-1);
  62                         }
  63                 }
  64
  65                 return (size_t)(0);
  66         }
  67         else
  68         {
  69                 errno = EBADF;
  70                 return (size_t)(-1);
  71         }
  72 }
  73
  74 int iconv_close (iconv_t cd)
  75 {
  76         return 0;
  77 }