libRASCH

00001 
00009 /*----------------------------------------------------------------------------
00010  *
00011  * Copyright (C) 2004, Raphael Schneider
00012  * See the file COPYING for information on usage and redistribution.
00013  *
00014  * $Header: /home/cvs_repos.bak/librasch/src/shared/i18n.c,v 1.4 2004/07/27 08:49:35 rasch Exp $
00015  *
00016  *--------------------------------------------------------------------------*/
00017 
00018 
00019 #include <string.h>
00020 
00021 #define _LIBRASCH_BUILD
00022 #include <ra_priv.h>
00023 #include <locale.h>
00024 #include <iconv.h>
00025 
00026 
00027 /* prototypes needed only here */
00028 int do_i18n_conversion_inplace(char *string, size_t dest_size, const char *from, const char *to);
00029 int do_i18n_conversion(const char *src, char *dest, size_t dest_size, const char *from, const char *to);
00030 int local_is_utf8();
00031 
00032 
00033 int
00034 local_to_utf8(const char *src, char *dest, size_t dest_size)
00035 {
00036         return do_i18n_conversion(src, dest, dest_size, ra_i18n_codeset, "UTF-8");
00037 } /* local_to_utf8() */
00038 
00039 
00040 int
00041 local_to_utf8_inplace(char *string, size_t buf_size)
00042 {
00043         return do_i18n_conversion_inplace(string, buf_size, ra_i18n_codeset, "UTF-8");
00044 } /* local_to_utf8_inplace() */
00045 
00046 
00047 int
00048 utf8_to_local(const char *src, char *dest, size_t dest_size)
00049 {
00050         return do_i18n_conversion(src, dest, dest_size, "UTF-8", ra_i18n_codeset);
00051 } /* utf8_to_local() */
00052 
00053 
00054 int
00055 utf8_to_local_inplace(char *string, size_t buf_size)
00056 {
00057         return do_i18n_conversion_inplace(string, buf_size, "UTF-8", ra_i18n_codeset);
00058 } /* local_to_utf8_inplace() */
00059 
00060 
00061 int
00062 do_i18n_conversion_inplace(char *string, size_t dest_size, const char *from, const char *to)
00063 {
00064         char *conv = NULL;
00065         size_t len;
00066         int ret;
00067 
00068         if (string == NULL)
00069                 return -1;
00070         if (string[0] == '\0')
00071                 return 0;
00072 
00073         len = strlen(string) * 2;
00074         conv = malloc(len);
00075         ret = do_i18n_conversion(string, conv, len, from, to);
00076         strncpy(string, conv, dest_size);
00077         free(conv);
00078 
00079         return ret;
00080 } /* do_i18n_conversion_inplace() */
00081 
00082 
00083 int
00084 do_i18n_conversion(const char *src, char *dest, size_t dest_size, const char *from, const char *to)
00085 {
00086         int ret = 0;
00087         iconv_t cd;
00088         size_t in_bytes, out_bytes;
00089         char *in, *out;
00090 
00091         if ((src == NULL) || (dest == NULL) || (dest_size <= 0))
00092                 return -1;
00093 
00094         if (src[0] == '\0')
00095         {
00096                 dest[0] = '\0';
00097                 return 0;
00098         }
00099 
00100         /* if no i18n support or locale is UTF-8 then do no conversion */
00101         if ((ra_i18n_codeset[0] == '\0') || (local_is_utf8()))
00102         {
00103                 strncpy(dest, src, dest_size);
00104                 return 0;
00105         }
00106 
00107         cd = iconv_open(to, from);
00108         /* if iconv can not be opened, just copy string but return error */
00109         if (cd == (iconv_t)-1)
00110         {
00111                 strncpy(dest, src, dest_size);
00112                 return -1;
00113         }
00114 
00115         /* convert string, do no special error handling */
00116         in_bytes = strlen(src);
00117         out_bytes = dest_size;
00118         in = (char *)src;
00119         out = dest;
00120         if (iconv(cd, &in, &in_bytes, &out, &out_bytes) == (size_t)-1)
00121                 ret = -2;
00122         
00123         dest[dest_size-out_bytes] = '\0';
00124 
00125         iconv_close(cd);
00126 
00127         return ret;
00128 }  /* do_i18n_conversion() */
00129 
00130 
00131 int
00132 local_is_utf8()
00133 {
00134         if (strcmp(ra_i18n_codeset, "UTF-8") == 0)
00135                 return 1;
00136 
00137         return 0;
00138 }  /* local_is_utf8() */
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