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%% options
copyright owner = Dirk Krause
copyright year = 2015-xxxx
license = bsd
%% header
/** @file
String recoding from UTF-16 to 32 bit.
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-16 to 32 bit.
@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_utf16_to_c32(
dk4_c32_t *dstb, size_t szdstb, const dk4_c16_t *src, dk4_er_t *erp
);
#ifdef __cplusplus
}
#endif
%% module
#include "dk4rec19.h"
#include "dk4utf16.h"
int
dk4recode_utf16_to_c32(
dk4_c32_t *dstb, size_t szdstb, const dk4_c16_t *src, dk4_er_t *erp
)
{
dk4_utf16_decoder_t dec;
size_t used = 0;
size_t rd = 0;
dk4_c32_t c32 = dkC32(0);
int back = 0;
if ((NULL != dstb) && (NULL != src) && (0 < szdstb)) {
back = 1;
dk4utf16_init(&dec);
while(((dk4_c16_t)0U != *src) && (1 == back) && (used < szdstb)) {
switch(dk4utf16_add(&dec, *(src++))) {
case DK4_EDSTM_FINISHED: {
c32 = dk4utf16_get(&dec);
dk4utf16_init(&dec);
dstb[used++] = c32;
} break;
case DK4_EDSTM_ERROR: {
back = 0;
dk4error_set_elsize_nelem(erp, DK4_E_SYNTAX, 2, rd);
} break;
}
if (0 != back) { rd++; }
}
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 == dk4utf16_is_empty(&dec)) {
back = 0;
dk4error_set_elsize_nelem(erp, DK4_E_SYNTAX, 2, rd);
}
} else {
dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
}
return back;
}
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