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#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <iconv.h>
static iconv_t s_cd;
/* Call iconv_open only once so the benchmark will be faster? */
static void __attribute__ ((constructor)) init_iconv(void)
{
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
s_cd = iconv_open("UTF-16LE", "UTF-8");
#else
s_cd = iconv_open("UTF-16BE", "UTF-8");
#endif
if (s_cd == (iconv_t)-1) {
perror("iconv_open");
exit(1);
}
}
/*
* Parameters:
* - buf8, len8: input utf-8 string
* - buf16: buffer to store decoded utf-16 string
* - *len16: on entry - utf-16 buffer length in bytes
* on exit - length in bytes of valid decoded utf-16 string
* Returns:
* - 0: success
* - >0: error position of input utf-8 string
* - -1: utf-16 buffer overflow
* LE/BE depends on host
*/
int utf8_to16_iconv(const unsigned char *buf8, size_t len8,
unsigned short *buf16, size_t *len16)
{
size_t ret, len16_save = *len16;
const unsigned char *buf8_0 = buf8;
ret = iconv(s_cd, (char **)&buf8, &len8, (char **)&buf16, len16);
*len16 = len16_save - *len16;
if (ret != (size_t)-1)
return 0;
if (errno == E2BIG)
return -1; /* Output buffer full */
return buf8 - buf8_0 + 1; /* EILSEQ, EINVAL, error position */
}
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