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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;
int stopped;
};
static void charset_emit(void *ctx, long int output)
{
struct charset_emit_param *param = (struct charset_emit_param *)ctx;
if (param->outlen > 0) {
*param->output++ = (char)output;
param->outlen--;
} else {
param->stopped = 1;
}
}
int charset_from_unicode(const wchar_t **input, int *inlen,
char *output, int outlen,
int charset, charset_state *state, int *error)
{
charset_spec const *spec = charset_find_spec(charset);
charset_state localstate = CHARSET_INIT_STATE;
struct charset_emit_param param;
int locallen;
if (!input) {
locallen = 1;
inlen = &locallen;
}
param.output = output;
param.outlen = outlen;
param.stopped = 0;
if (state)
localstate = *state; /* structure copy */
if (error)
*error = FALSE;
while (*inlen > 0) {
int lenbefore = (int)(param.output - output);
int ret;
if (input)
ret = spec->write(spec, **input, &localstate,
charset_emit, ¶m);
else
ret = spec->write(spec, -1, &localstate, charset_emit, ¶m);
if (error && !ret) {
/*
* We have hit a difficult character, which the user
* wants to know about. Leave now.
*/
*error = TRUE;
return lenbefore;
}
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 */
if (input)
(*input)++;
(*inlen)--;
}
return (int)(param.output - output);
}
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