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%% options
copyright owner = Dirk Krause
copyright year = 2015-xxxx
license = bsd
%% header
/** @file
String recoding from UTF-8 to ANSI.
CRT on Windows: Not used.
*/
#ifndef DK4CONF_H_INCLUDED
#include "dk4conf.h"
#endif
#ifndef DK4TYPES_H_INCLUDED
#include "dk4types.h"
#endif
#ifndef DK4ERROR_H_INCLUDED
#include "dk4error.h"
#endif
#ifdef __cplusplus
extern "C" {
#endif
/** Recode string from UTF-8 to ANSI.
@param dstb Destination buffer.
@param szdstb Size of destination buffer (number of bytes).
@param src Source string to convert.
@param erp Error report, may be NULL.
@return 1 on success, 0 on error.
Error codes:
- DK4_E_INVALID_ARGUMENTS<br>
if src or dstb is NULL or szdstb is 0,
- DK4_E_BUFFER_TOO_SMALL<br>
if dstb is too small,
- DK4_E_SYNTAX<br>
with the number of successfully recoded characters in nelem if a
non-recodable character was found.
*/
int
dk4recode_utf8_to_ansi(
char *dstb, size_t szdstb, const char *src, dk4_er_t *erp
);
/** Calculate required buffer size (including final 0x00 byte)
for UTF-8 to ANSI conversion.
@param src UTF-8 encoded source string.
@param erp Error report, may be NULL.
@return Positive buffer size on success, 0 on error.
Error codes:
- DK4_E_INVALID_ARGUMENTS<br>
if src is NULL,
- DK4_E_MATH_OVERFLOW<br>
if the required size calculation results in mathematical overflow,
- DK4_E_SYNTAX<br>
if there are errors while decoding the source string.
*/
size_t
dk4recode_size_utf8_to_ansi(const char *src, dk4_er_t *erp);
#ifdef __cplusplus
}
#endif
%% module
#include "dk4rec06.h"
#include "dk4utf8.h"
#include "dk4ansi.h"
size_t
dk4recode_size_utf8_to_ansi(const char *src, dk4_er_t *erp)
{
dk4_er_t er;
dk4_utf8_decoder_t dec;
size_t rdb = 0;
size_t back = 0;
dk4_c32_t c32;
unsigned char uc;
if (NULL != src) {
/* Initialize data structures.
*/
dk4error_init(&er);
dk4utf8_init(&dec);
/* Process source string.
*/
while ('\0' != *src) {
rdb++;
switch(dk4utf8_add(&dec, (unsigned char)(*(src++)))) {
case DK4_EDSTM_FINISHED: {
c32 = dk4utf8_get(&dec);
dk4utf8_init(&dec);
if (0 != dk4ansi_encode(&uc, c32)) {
if (SIZE_MAX == back) {
dk4error_set_simple_error_code(&er, DK4_E_MATH_OVERFLOW);
} else {
back++;
}
} else {
dk4error_set_elsize_nelem(&er, DK4_E_SYNTAX, 1, rdb);
}
} break;
case DK4_EDSTM_ERROR: {
dk4error_set_elsize_nelem(&er, DK4_E_SYNTAX, 1, rdb);
} break;
}
}
if (0 == dk4utf8_is_empty(&dec)) {
dk4error_set_elsize_nelem(&er, DK4_E_SYNTAX, 1, rdb);
}
/* Add one for the finalizer.
*/
if (SIZE_MAX == back) {
dk4error_set_simple_error_code(&er, DK4_E_MATH_OVERFLOW);
} else {
back++;
}
/* On error return 0 and pass error code.
*/
if (DK4_E_NONE != er.ec) {
back = 0;
dk4error_copy(erp, &er);
}
} else {
dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
}
return back;
}
int
dk4recode_utf8_to_ansi(
char *dstb, size_t szdstb, const char *src, dk4_er_t *erp
)
{
dk4_utf8_decoder_t dec;
size_t used = 0;
size_t rdb = 0;
dk4_c32_t c32 = dkC32(0);
int back = 0;
unsigned char uc = '\0';
if ((NULL != dstb) && (NULL != src) && (0 < szdstb)) {
back = 1;
dk4utf8_init(&dec);
while(('\0' != *src) && (1 == back) && (used < szdstb)) {
switch(dk4utf8_add(&dec, (unsigned char)(*(src++)))) {
case DK4_EDSTM_FINISHED: {
c32 = dk4utf8_get(&dec);
dk4utf8_init(&dec);
if (0 != dk4ansi_encode(&uc, c32)) {
dstb[used++] = (char)uc;
} else {
back = 0;
dk4error_set_elsize_nelem(erp, DK4_E_SYNTAX, 1, rdb);
}
} break;
case DK4_EDSTM_ERROR: {
back = 0;
dk4error_set_elsize_nelem(erp, DK4_E_SYNTAX, 1, rdb);
} break;
}
if(back) { rdb++; }
}
if (used < szdstb) {
dstb[used] = '\0';
} else {
dstb[szdstb - 1] = '\0';
back = 0;
dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
}
if (0 == dk4utf8_is_empty(&dec)) {
back = 0;
dk4error_set_elsize_nelem(erp, DK4_E_SYNTAX, 1, rdb);
}
} else {
dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
}
return back;
}
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