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6aa4211f6e
putty-source/ldisc.c
Simon Tatham 6aa4211f6e Remove all `enum'-typed variables from the Config structure. 
Everything in there which is integral is now an actual int, which
means my forthcoming revamp of the config box will be able to work
with `int *' pointers without fear of doom.

[originally from svn r2733]
2003-01-27 18:02:24 +00:00

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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"
#define ECHOING (ldisc->cfg->localecho == FORCE_ON || \
(ldisc->cfg->localecho == AUTO && \
(ldisc->back->ldisc(ldisc->backhandle, LD_ECHO) || \
term_ldisc(ldisc->term, LD_ECHO))))
#define EDITING (ldisc->cfg->localedit == FORCE_ON || \
(ldisc->cfg->localedit == AUTO && \
(ldisc->back->ldisc(ldisc->backhandle, LD_EDIT) || \
term_ldisc(ldisc->term, LD_EDIT))))
static void c_write(Ldisc ldisc, char *buf, int len)
{
from_backend(ldisc->term, 0, buf, len);
}
static int plen(Ldisc ldisc, unsigned char c)
{
if ((c >= 32 && c <= 126) || (c >= 160 && !in_utf(ldisc->term)))
return 1;
else if (c < 128)
return 2; /* ^x for some x */
else
return 4; /* <XY> for hex XY */
}
static void pwrite(Ldisc ldisc, unsigned char c)
{
if ((c >= 32 && c <= 126) || (c >= 160 && !in_utf(ldisc->term))) {
c_write(ldisc, (char *)&c, 1);
} else if (c < 128) {
char cc[2];
cc[1] = (c == 127 ? '?' : c + 0x40);
cc[0] = '^';
c_write(ldisc, cc, 2);
} else {
char cc[5];
sprintf(cc, "<%02X>", c);
c_write(ldisc, cc, 4);
}
}
static void bsb(Ldisc ldisc, int n)
{
while (n--)
c_write(ldisc, "\010 \010", 3);
}
#define CTRL(x) (x^'@')
#define KCTRL(x) ((x^'@') | 0x100)
void *ldisc_create(Config *mycfg, Terminal *term,
Backend *back, void *backhandle,
void *frontend)
{
Ldisc ldisc = smalloc(sizeof(*ldisc));
ldisc->buf = NULL;
ldisc->buflen = 0;
ldisc->bufsiz = 0;
ldisc->quotenext = 0;
ldisc->cfg = mycfg;
ldisc->back = back;
ldisc->backhandle = backhandle;
ldisc->term = term;
ldisc->frontend = frontend;
/* Link ourselves into the backend and the terminal */
if (term)
term->ldisc = ldisc;
if (back)
back->provide_ldisc(backhandle, ldisc);
return ldisc;
}
void ldisc_free(void *handle)
{
Ldisc ldisc = (Ldisc) handle;
if (ldisc->term)
ldisc->term->ldisc = NULL;
if (ldisc->back)
ldisc->back->provide_ldisc(ldisc->backhandle, NULL);
if (ldisc->buf)
sfree(ldisc->buf);
sfree(ldisc);
}
void ldisc_send(void *handle, char *buf, int len, int interactive)
{
Ldisc ldisc = (Ldisc) handle;
int keyflag = 0;
/*
* Called with len=0 when the options change. We must inform
* the front end in case it needs to know.
*/
if (len == 0) {
ldisc_update(ldisc->frontend, ECHOING, EDITING);
return;
}
/*
* Notify the front end that something was pressed, in case
* it's depending on finding out (e.g. keypress termination for
* Close On Exit).
*/
frontend_keypress(ldisc->frontend);
/*
* Less than zero means null terminated special string.
*/
if (len < 0) {
len = strlen(buf);
keyflag = KCTRL('@');
}
/*
* Either perform local editing, or just send characters.
*/
if (EDITING) {
while (len--) {
int c;
c = *buf++ + keyflag;
if (!interactive && c == '\r')
c += KCTRL('@');
switch (ldisc->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 KCTRL('H'):
case KCTRL('?'): /* backspace/delete */
if (ldisc->buflen > 0) {
if (ECHOING)
bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1]));
ldisc->buflen--;
}
break;
case CTRL('W'): /* delete word */
while (ldisc->buflen > 0) {
if (ECHOING)
bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1]));
ldisc->buflen--;
if (ldisc->buflen > 0 &&
isspace(ldisc->buf[ldisc->buflen - 1]) &&
!isspace(ldisc->buf[ldisc->buflen]))
break;
}
break;
case CTRL('U'): /* delete line */
case CTRL('C'): /* Send IP */
case CTRL('\\'): /* Quit */
case CTRL('Z'): /* Suspend */
while (ldisc->buflen > 0) {
if (ECHOING)
bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1]));
ldisc->buflen--;
}
ldisc->back->special(ldisc->backhandle, TS_EL);
/*
* We don't send IP, SUSP or ABORT if the user has
* configured telnet specials off! This breaks
* talkers otherwise.
*/
if (!ldisc->cfg->telnet_keyboard)
goto default_case;
if (c == CTRL('C'))
ldisc->back->special(ldisc->backhandle, TS_IP);
if (c == CTRL('Z'))
ldisc->back->special(ldisc->backhandle, TS_SUSP);
if (c == CTRL('\\'))
ldisc->back->special(ldisc->backhandle, TS_ABORT);
break;
case CTRL('R'): /* redraw line */
if (ECHOING) {
int i;
c_write(ldisc, "^R\r\n", 4);
for (i = 0; i < ldisc->buflen; i++)
pwrite(ldisc, ldisc->buf[i]);
}
break;
case CTRL('V'): /* quote next char */
ldisc->quotenext = TRUE;
break;
case CTRL('D'): /* logout or send */
if (ldisc->buflen == 0) {
ldisc->back->special(ldisc->backhandle, TS_EOF);
} else {
ldisc->back->send(ldisc->backhandle, ldisc->buf, ldisc->buflen);
ldisc->buflen = 0;
}
break;
/*
* This particularly hideous bit of code from RDB
* allows ordinary ^M^J to do the same thing as
* magic-^M when in Raw protocol. The line `case
* KCTRL('M'):' is _inside_ the if block. Thus:
*
* - receiving regular ^M goes straight to the
* default clause and inserts as a literal ^M.
* - receiving regular ^J _not_ directly after a
* literal ^M (or not in Raw protocol) fails the
* if condition, leaps to the bottom of the if,
* and falls through into the default clause
* again.
* - receiving regular ^J just after a literal ^M
* in Raw protocol passes the if condition,
* deletes the literal ^M, and falls through
* into the magic-^M code
* - receiving a magic-^M empties the line buffer,
* signals end-of-line in one of the various
* entertaining ways, and _doesn't_ fall out of
* the bottom of the if and through to the
* default clause because of the break.
*/
case CTRL('J'):
if (ldisc->cfg->protocol == PROT_RAW &&
ldisc->buflen > 0 && ldisc->buf[ldisc->buflen - 1] == '\r') {
if (ECHOING)
bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1]));
ldisc->buflen--;
/* FALLTHROUGH */
case KCTRL('M'): /* send with newline */
if (ldisc->buflen > 0)
ldisc->back->send(ldisc->backhandle, ldisc->buf, ldisc->buflen);
if (ldisc->cfg->protocol == PROT_RAW)
ldisc->back->send(ldisc->backhandle, "\r\n", 2);
else if (ldisc->cfg->protocol == PROT_TELNET && ldisc->cfg->telnet_newline)
ldisc->back->special(ldisc->backhandle, TS_EOL);
else
ldisc->back->send(ldisc->backhandle, "\r", 1);
if (ECHOING)
c_write(ldisc, "\r\n", 2);
ldisc->buflen = 0;
break;
}
/* FALLTHROUGH */
default: /* get to this label from ^V handler */
default_case:
if (ldisc->buflen >= ldisc->bufsiz) {
ldisc->bufsiz = ldisc->buflen + 256;
ldisc->buf = srealloc(ldisc->buf, ldisc->bufsiz);
}
ldisc->buf[ldisc->buflen++] = c;
if (ECHOING)
pwrite(ldisc, (unsigned char) c);
ldisc->quotenext = FALSE;
break;
}
}
} else {
if (ldisc->buflen != 0) {
ldisc->back->send(ldisc->backhandle, ldisc->buf, ldisc->buflen);
while (ldisc->buflen > 0) {
bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1]));
ldisc->buflen--;
}
}
if (len > 0) {
if (ECHOING)
c_write(ldisc, buf, len);
if (keyflag && ldisc->cfg->protocol == PROT_TELNET && len == 1) {
switch (buf[0]) {
case CTRL('M'):
if (ldisc->cfg->protocol == PROT_TELNET && ldisc->cfg->telnet_newline)
ldisc->back->special(ldisc->backhandle, TS_EOL);
else
ldisc->back->send(ldisc->backhandle, "\r", 1);
break;
case CTRL('?'):
case CTRL('H'):
if (ldisc->cfg->telnet_keyboard) {
ldisc->back->special(ldisc->backhandle, TS_EC);
break;
}
case CTRL('C'):
if (ldisc->cfg->telnet_keyboard) {
ldisc->back->special(ldisc->backhandle, TS_IP);
break;
}
case CTRL('Z'):
if (ldisc->cfg->telnet_keyboard) {
ldisc->back->special(ldisc->backhandle, TS_SUSP);
break;
}
default:
ldisc->back->send(ldisc->backhandle, buf, len);
break;
}
} else
ldisc->back->send(ldisc->backhandle, buf, len);
}
}
}
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