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/*
* fromucs.c - convert Unicode to other character sets.
*/
#include "charset.h"
#include "internal.h"
struct charset_emit_param {
char *output;
int outlen;
const char *errstr;
int errlen;
int stopped;
};
static void charset_emit(void *ctx, long int output)
{
struct charset_emit_param *param = (struct charset_emit_param *)ctx;
char outval;
char const *p;
int outlen;
if (output == ERROR) {
p = param->errstr;
outlen = param->errlen;
} else {
outval = output;
p = &outval;
outlen = 1;
}
if (param->outlen >= outlen) {
while (outlen > 0) {
*param->output++ = *p++;
param->outlen--;
outlen--;
}
} else {
param->stopped = 1;
}
}
int charset_from_unicode(const wchar_t **input, int *inlen,
char *output, int outlen,
int charset, charset_state *state,
const char *errstr, int errlen)
{
charset_spec const *spec = charset_find_spec(charset);
charset_state localstate;
struct charset_emit_param param;
param.output = output;
param.outlen = outlen;
param.stopped = 0;
/*
* charset_emit will expect a valid errstr.
*/
if (!errstr) {
/* *shrug* this is good enough, and consistent across all SBCS... */
param.errstr = ".";
param.errlen = 1;
}
param.errstr = errstr;
param.errlen = errlen;
if (!state) {
localstate.s0 = 0;
} else {
localstate = *state; /* structure copy */
}
state = &localstate;
while (*inlen > 0) {
int lenbefore = param.output - output;
spec->write(spec, **input, &localstate, charset_emit, ¶m);
if (param.stopped) {
/*
* The emit function has _tried_ to output some
* characters, but ran up against the end of the
* buffer. Leave immediately, and return what happened
* _before_ attempting to process this character.
*/
return lenbefore;
}
if (state)
*state = localstate; /* structure copy */
(*input)++;
(*inlen)--;
}
return param.output - output;
}
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