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511eea450a
I knew there had to already be a UTF-8 encoder _somewhere_ in this code base, but it took me a while to find it! Now it's reusable in other contexts.
84 lines
1.8 KiB
C
84 lines
1.8 KiB
C
/*
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* ldisc.c: PuTTY line discipline. Sits between the input coming
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* from keypresses in the window, and the output channel leading to
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* the back end. Implements echo and/or local line editing,
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* depending on what's currently configured.
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*/
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#include <stdio.h>
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#include <ctype.h>
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#include "putty.h"
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#include "terminal.h"
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#include "ldisc.h"
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void lpage_send(Ldisc *ldisc,
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int codepage, const char *buf, int len, bool interactive)
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{
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wchar_t *widebuffer = 0;
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int widesize = 0;
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int wclen;
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if (codepage < 0) {
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ldisc_send(ldisc, buf, len, interactive);
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return;
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}
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widesize = len * 2;
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widebuffer = snewn(widesize, wchar_t);
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wclen = mb_to_wc(codepage, 0, buf, len, widebuffer, widesize);
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luni_send(ldisc, widebuffer, wclen, interactive);
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sfree(widebuffer);
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}
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void luni_send(Ldisc *ldisc, const wchar_t *widebuf, int len, bool interactive)
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{
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int ratio = (in_utf(ldisc->term))?3:1;
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char *linebuffer;
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int linesize;
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int i;
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char *p;
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linesize = len * ratio * 2;
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linebuffer = snewn(linesize, char);
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if (in_utf(ldisc->term)) {
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/* UTF is a simple algorithm */
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for (p = linebuffer, i = 0; i < len; i++) {
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unsigned long ch = widebuf[i];
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if (IS_SURROGATE(ch)) {
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#ifdef PLATFORM_IS_UTF16
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if (i+1 < len) {
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unsigned long ch2 = widebuf[i+1];
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if (IS_SURROGATE_PAIR(ch, ch2)) {
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ch = FROM_SURROGATES(ch, ch2);
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i++;
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}
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} else
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#endif
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{
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/* Unrecognised UTF-16 sequence */
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ch = '.';
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}
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}
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p += encode_utf8(p, ch);
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}
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} else {
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int rv;
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rv = wc_to_mb(ldisc->term->ucsdata->line_codepage, 0, widebuf, len,
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linebuffer, linesize, NULL, ldisc->term->ucsdata);
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if (rv >= 0)
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p = linebuffer + rv;
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else
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p = linebuffer;
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}
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if (p > linebuffer)
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ldisc_send(ldisc, linebuffer, p - linebuffer, interactive);
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sfree(linebuffer);
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}
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