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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 <windows.h>
#include <stdio.h>
#include <ctype.h>
#include "putty.h"
#define ECHOING (cfg.localecho == LD_YES || \
(cfg.localecho == LD_BACKEND && \
(back->ldisc(LD_ECHO) || term_ldisc(LD_ECHO))))
#define EDITING (cfg.localedit == LD_YES || \
(cfg.localedit == LD_BACKEND && \
(back->ldisc(LD_EDIT) || term_ldisc(LD_EDIT))))
static void c_write (char *buf, int len) {
from_backend(0, buf, len);
}
static char *term_buf = NULL;
static int term_buflen = 0, term_bufsiz = 0, term_quotenext = 0;
static int plen(unsigned char c) {
if ((c >= 32 && c <= 126) ||
(c >= 160))
return 1;
else if (c < 128)
return 2; /* ^x for some x */
else
return 4; /* <XY> for hex XY */
}
static void pwrite(unsigned char c) {
if ((c >= 32 && c <= 126) ||
(c >= 160)) {
c_write(&c, 1);
} else if (c < 128) {
char cc[2];
cc[1] = (c == 127 ? '?' : c + 0x40);
cc[0] = '^';
c_write(cc, 2);
} else {
char cc[5];
sprintf(cc, "<%02X>", c);
c_write(cc, 4);
}
}
static void bsb(int n) {
while (n--)
c_write("\010 \010", 3);
}
#define CTRL(x) (x^'@')
void ldisc_send(char *buf, int len) {
/*
* Called with len=0 when the options change. We must inform
* the front end in case it needs to know.
*/
if (len == 0) {
void ldisc_update(int echo, int edit);
ldisc_update(ECHOING, EDITING);
}
/*
* Either perform local editing, or just send characters.
*/
if (EDITING) {
while (len--) {
char c;
c = *buf++;
switch (term_quotenext ? ' ' : c) {
/*
* ^h/^?: delete one char and output one BSB
* ^w: delete, and output BSBs, to return to last
* space/nonspace boundary
* ^u: delete, and output BSBs, to return to BOL
* ^c: Do a ^u then send a telnet IP
* ^z: Do a ^u then send a telnet SUSP
* ^\: Do a ^u then send a telnet ABORT
* ^r: echo "^R\n" and redraw line
* ^v: quote next char
* ^d: if at BOL, end of file and close connection,
* else send line and reset to BOL
* ^m: send line-plus-\r\n and reset to BOL
*/
case CTRL('H'): case CTRL('?'): /* backspace/delete */
if (term_buflen > 0) {
if (ECHOING)
bsb(plen(term_buf[term_buflen-1]));
term_buflen--;
}
break;
case CTRL('W'): /* delete word */
while (term_buflen > 0) {
if (ECHOING)
bsb(plen(term_buf[term_buflen-1]));
term_buflen--;
if (term_buflen > 0 &&
isspace(term_buf[term_buflen-1]) &&
!isspace(term_buf[term_buflen]))
break;
}
break;
case CTRL('U'): /* delete line */
case CTRL('C'): /* Send IP */
case CTRL('\\'): /* Quit */
case CTRL('Z'): /* Suspend */
while (term_buflen > 0) {
if (ECHOING)
bsb(plen(term_buf[term_buflen-1]));
term_buflen--;
}
back->special (TS_EL);
if( c == CTRL('C') ) back->special (TS_IP);
if( c == CTRL('Z') ) back->special (TS_SUSP);
if( c == CTRL('\\') ) back->special (TS_ABORT);
break;
case CTRL('R'): /* redraw line */
if (ECHOING) {
int i;
c_write("^R\r\n", 4);
for (i = 0; i < term_buflen; i++)
pwrite(term_buf[i]);
}
break;
case CTRL('V'): /* quote next char */
term_quotenext = TRUE;
break;
case CTRL('D'): /* logout or send */
if (term_buflen == 0) {
back->special (TS_EOF);
} else {
back->send(term_buf, term_buflen);
term_buflen = 0;
}
break;
case CTRL('M'): /* send with newline */
if (term_buflen > 0)
back->send(term_buf, term_buflen);
if (cfg.protocol == PROT_RAW)
back->send("\r\n", 2);
else
back->send("\r", 1);
if (ECHOING)
c_write("\r\n", 2);
term_buflen = 0;
break;
default: /* get to this label from ^V handler */
if (term_buflen >= term_bufsiz) {
term_bufsiz = term_buflen + 256;
term_buf = saferealloc(term_buf, term_bufsiz);
}
term_buf[term_buflen++] = c;
if (ECHOING)
pwrite(c);
term_quotenext = FALSE;
break;
}
}
} else {
if( term_buflen != 0 )
{
back->send(term_buf, term_buflen);
while (term_buflen > 0) {
bsb(plen(term_buf[term_buflen-1]));
term_buflen--;
}
}
if (len > 0) {
if (ECHOING)
c_write(buf, len);
back->send(buf, len);
}
}
}
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