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/*
* ldisc.c: PuTTY line discipline. Sits between the input coming
* from keypresses in the window, and the output channel leading to
* the back end. Implements echo and/or local line editing,
* depending on what's currently configured.
*/
#include <stdio.h>
#include <ctype.h>
#include "putty.h"
#include "terminal.h"
#include "ldisc.h"
void lpage_send(void *handle,
int codepage, char *buf, int len, int interactive)
{
Ldisc ldisc = (Ldisc)handle;
wchar_t *widebuffer = 0;
int widesize = 0;
int wclen;
if (codepage < 0) {
ldisc_send(ldisc, buf, len, interactive);
return;
}
widesize = len * 2;
widebuffer = snewn(widesize, wchar_t);
wclen = mb_to_wc(codepage, 0, buf, len, widebuffer, widesize);
luni_send(ldisc, widebuffer, wclen, interactive);
sfree(widebuffer);
}
void luni_send(void *handle, wchar_t * widebuf, int len, int interactive)
{
Ldisc ldisc = (Ldisc)handle;
int ratio = (in_utf(ldisc->term))?3:1;
char *linebuffer;
int linesize;
int i;
char *p;
linesize = len * ratio * 2;
linebuffer = snewn(linesize, char);
if (in_utf(ldisc->term)) {
/* UTF is a simple algorithm */
for (p = linebuffer, i = 0; i < len; i++) {
unsigned long ch = widebuf[i];
if (IS_SURROGATE(ch)) {
#ifdef PLATFORM_IS_UTF16
if (i+1 < len) {
unsigned long ch2 = widebuf[i+1];
if (IS_SURROGATE_PAIR(ch, ch2)) {
ch = FROM_SURROGATES(ch, ch2);
i++;
}
} else
#endif
{
/* Unrecognised UTF-16 sequence */
ch = '.';
}
}
if (ch < 0x80) {
*p++ = (char) (ch);
} else if (ch < 0x800) {
*p++ = (char) (0xC0 | (ch >> 6));
*p++ = (char) (0x80 | (ch & 0x3F));
} else if (ch < 0x10000) {
*p++ = (char) (0xE0 | (ch >> 12));
*p++ = (char) (0x80 | ((ch >> 6) & 0x3F));
*p++ = (char) (0x80 | (ch & 0x3F));
} else {
*p++ = (char) (0xF0 | (ch >> 18));
*p++ = (char) (0x80 | ((ch >> 12) & 0x3F));
*p++ = (char) (0x80 | ((ch >> 6) & 0x3F));
*p++ = (char) (0x80 | (ch & 0x3F));
}
}
} else {
int rv;
rv = wc_to_mb(ldisc->term->ucsdata->line_codepage, 0, widebuf, len,
linebuffer, linesize, NULL, NULL, ldisc->term->ucsdata);
if (rv >= 0)
p = linebuffer + rv;
else
p = linebuffer;
}
if (p > linebuffer)
ldisc_send(ldisc, linebuffer, p - linebuffer, interactive);
sfree(linebuffer);
}