mdw@git.distorted.org.uk Git - sgt/putty/blob - ldiscucs.c

   1 /*
   2  * ldisc.c: PuTTY line discipline. Sits between the input coming
   3  * from keypresses in the window, and the output channel leading to
   4  * the back end. Implements echo and/or local line editing,
   5  * depending on what's currently configured.
   6  */
   7
   8 #include <stdio.h>
   9 #include <ctype.h>
  10
  11 #include "putty.h"
  12 #include "terminal.h"
  13 #include "ldisc.h"
  14
  15 void lpage_send(void *handle,
  16                 int codepage, char *buf, int len, int interactive)
  17 {
  18     Ldisc ldisc = (Ldisc)handle;
  19     wchar_t *widebuffer = 0;
  20     int widesize = 0;
  21     int wclen;
  22
  23     if (codepage < 0) {
  24         ldisc_send(ldisc, buf, len, interactive);
  25         return;
  26     }
  27
  28     widesize = len * 2;
  29     widebuffer = snewn(widesize, wchar_t);
  30
  31     wclen = mb_to_wc(codepage, 0, buf, len, widebuffer, widesize);
  32     luni_send(ldisc, widebuffer, wclen, interactive);
  33
  34     sfree(widebuffer);
  35 }
  36
  37 void luni_send(void *handle, wchar_t * widebuf, int len, int interactive)
  38 {
  39     Ldisc ldisc = (Ldisc)handle;
  40     int ratio = (in_utf(ldisc->term))?3:1;
  41     char *linebuffer;
  42     int linesize;
  43     int i;
  44     char *p;
  45
  46     linesize = len * ratio * 2;
  47     linebuffer = snewn(linesize, char);
  48
  49     if (in_utf(ldisc->term)) {
  50         /* UTF is a simple algorithm */
  51         for (p = linebuffer, i = 0; i < len; i++) {
  52             unsigned long ch = widebuf[i];
  53
  54             if (IS_SURROGATE(ch)) {
  55 #ifdef PLATFORM_IS_UTF16
  56                 if (i+1 < len) {
  57                     unsigned long ch2 = widebuf[i+1];
  58                     if (IS_SURROGATE_PAIR(ch, ch2)) {
  59                         ch = FROM_SURROGATES(ch, ch2);
  60                         i++;
  61                     }
  62                 } else
  63 #endif
  64                 {
  65                     /* Unrecognised UTF-16 sequence */
  66                     ch = '.';
  67                 }
  68             }
  69
  70             if (ch < 0x80) {
  71                 *p++ = (char) (ch);
  72             } else if (ch < 0x800) {
  73                 *p++ = (char) (0xC0 | (ch >> 6));
  74                 *p++ = (char) (0x80 | (ch & 0x3F));
  75             } else if (ch < 0x10000) {
  76                 *p++ = (char) (0xE0 | (ch >> 12));
  77                 *p++ = (char) (0x80 | ((ch >> 6) & 0x3F));
  78                 *p++ = (char) (0x80 | (ch & 0x3F));
  79             } else {
  80                 *p++ = (char) (0xF0 | (ch >> 18));
  81                 *p++ = (char) (0x80 | ((ch >> 12) & 0x3F));
  82                 *p++ = (char) (0x80 | ((ch >> 6) & 0x3F));
  83                 *p++ = (char) (0x80 | (ch & 0x3F));
  84             }
  85         }
  86     } else {
  87         int rv;
  88         rv = wc_to_mb(ldisc->term->ucsdata->line_codepage, 0, widebuf, len,
  89                       linebuffer, linesize, NULL, NULL, ldisc->term->ucsdata);
  90         if (rv >= 0)
  91             p = linebuffer + rv;
  92         else
  93             p = linebuffer;
  94     }
  95     if (p > linebuffer)
  96         ldisc_send(ldisc, linebuffer, p - linebuffer, interactive);
  97
  98     sfree(linebuffer);
  99 }