mirror of
https://git.tartarus.org/simon/putty.git
synced 2025-01-09 09:27:59 +00:00
0a80c983e2
all the global and function-static variables out of terminal.c into a dynamically allocated data structure. Note that this does not yet confer the ability to run more than one of them in the same process, because other things (the line discipline, the back end) are still global, and also in particular the address of the dynamically allocated terminal-data structure is held in a global variable `term'. But what I've got here represents a reasonable stopping point at which to check things in. In _theory_ this should all still work happily, on both Unix and Windows. In practice, who knows? [originally from svn r2115]
272 lines
7.1 KiB
C
272 lines
7.1 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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#define ECHOING (cfg.localecho == LD_YES || \
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(cfg.localecho == LD_BACKEND && \
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(back->ldisc(LD_ECHO) || term_ldisc(term, LD_ECHO))))
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#define EDITING (cfg.localedit == LD_YES || \
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(cfg.localedit == LD_BACKEND && \
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(back->ldisc(LD_EDIT) || term_ldisc(term, LD_EDIT))))
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static void c_write(char *buf, int len)
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{
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from_backend(term, 0, buf, len);
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}
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static char *term_buf = NULL;
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static int term_buflen = 0, term_bufsiz = 0, term_quotenext = 0;
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static int plen(unsigned char c)
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{
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if ((c >= 32 && c <= 126) || (c >= 160 && !in_utf(term)))
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return 1;
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else if (c < 128)
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return 2; /* ^x for some x */
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else
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return 4; /* <XY> for hex XY */
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}
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static void pwrite(unsigned char c)
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{
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if ((c >= 32 && c <= 126) || (c >= 160 && !in_utf(term))) {
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c_write(&c, 1);
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} else if (c < 128) {
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char cc[2];
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cc[1] = (c == 127 ? '?' : c + 0x40);
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cc[0] = '^';
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c_write(cc, 2);
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} else {
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char cc[5];
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sprintf(cc, "<%02X>", c);
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c_write(cc, 4);
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}
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}
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static void bsb(int n)
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{
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while (n--)
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c_write("\010 \010", 3);
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}
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#define CTRL(x) (x^'@')
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#define KCTRL(x) ((x^'@') | 0x100)
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void ldisc_send(char *buf, int len, int interactive)
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{
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int keyflag = 0;
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/*
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* Called with len=0 when the options change. We must inform
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* the front end in case it needs to know.
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*/
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if (len == 0) {
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void ldisc_update(int echo, int edit);
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ldisc_update(ECHOING, EDITING);
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return;
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}
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/*
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* Less than zero means null terminated special string.
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*/
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if (len < 0) {
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len = strlen(buf);
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keyflag = KCTRL('@');
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}
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/*
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* Either perform local editing, or just send characters.
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*/
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if (EDITING) {
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while (len--) {
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int c;
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c = *buf++ + keyflag;
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if (!interactive && c == '\r')
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c += KCTRL('@');
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switch (term_quotenext ? ' ' : c) {
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/*
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* ^h/^?: delete one char and output one BSB
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* ^w: delete, and output BSBs, to return to last
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* space/nonspace boundary
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* ^u: delete, and output BSBs, to return to BOL
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* ^c: Do a ^u then send a telnet IP
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* ^z: Do a ^u then send a telnet SUSP
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* ^\: Do a ^u then send a telnet ABORT
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* ^r: echo "^R\n" and redraw line
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* ^v: quote next char
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* ^d: if at BOL, end of file and close connection,
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* else send line and reset to BOL
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* ^m: send line-plus-\r\n and reset to BOL
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*/
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case KCTRL('H'):
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case KCTRL('?'): /* backspace/delete */
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if (term_buflen > 0) {
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if (ECHOING)
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bsb(plen(term_buf[term_buflen - 1]));
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term_buflen--;
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}
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break;
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case CTRL('W'): /* delete word */
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while (term_buflen > 0) {
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if (ECHOING)
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bsb(plen(term_buf[term_buflen - 1]));
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term_buflen--;
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if (term_buflen > 0 &&
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isspace(term_buf[term_buflen - 1]) &&
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!isspace(term_buf[term_buflen]))
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break;
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}
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break;
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case CTRL('U'): /* delete line */
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case CTRL('C'): /* Send IP */
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case CTRL('\\'): /* Quit */
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case CTRL('Z'): /* Suspend */
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while (term_buflen > 0) {
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if (ECHOING)
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bsb(plen(term_buf[term_buflen - 1]));
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term_buflen--;
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}
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back->special(TS_EL);
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/*
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* We don't send IP, SUSP or ABORT if the user has
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* configured telnet specials off! This breaks
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* talkers otherwise.
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*/
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if (!cfg.telnet_keyboard)
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goto default_case;
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if (c == CTRL('C'))
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back->special(TS_IP);
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if (c == CTRL('Z'))
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back->special(TS_SUSP);
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if (c == CTRL('\\'))
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back->special(TS_ABORT);
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break;
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case CTRL('R'): /* redraw line */
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if (ECHOING) {
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int i;
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c_write("^R\r\n", 4);
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for (i = 0; i < term_buflen; i++)
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pwrite(term_buf[i]);
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}
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break;
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case CTRL('V'): /* quote next char */
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term_quotenext = TRUE;
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break;
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case CTRL('D'): /* logout or send */
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if (term_buflen == 0) {
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back->special(TS_EOF);
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} else {
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back->send(term_buf, term_buflen);
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term_buflen = 0;
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}
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break;
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/*
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* This particularly hideous bit of code from RDB
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* allows ordinary ^M^J to do the same thing as
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* magic-^M when in Raw protocol. The line `case
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* KCTRL('M'):' is _inside_ the if block. Thus:
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*
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* - receiving regular ^M goes straight to the
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* default clause and inserts as a literal ^M.
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* - receiving regular ^J _not_ directly after a
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* literal ^M (or not in Raw protocol) fails the
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* if condition, leaps to the bottom of the if,
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* and falls through into the default clause
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* again.
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* - receiving regular ^J just after a literal ^M
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* in Raw protocol passes the if condition,
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* deletes the literal ^M, and falls through
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* into the magic-^M code
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* - receiving a magic-^M empties the line buffer,
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* signals end-of-line in one of the various
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* entertaining ways, and _doesn't_ fall out of
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* the bottom of the if and through to the
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* default clause because of the break.
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*/
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case CTRL('J'):
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if (cfg.protocol == PROT_RAW &&
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term_buflen > 0 && term_buf[term_buflen - 1] == '\r') {
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if (ECHOING)
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bsb(plen(term_buf[term_buflen - 1]));
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term_buflen--;
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/* FALLTHROUGH */
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case KCTRL('M'): /* send with newline */
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if (term_buflen > 0)
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back->send(term_buf, term_buflen);
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if (cfg.protocol == PROT_RAW)
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back->send("\r\n", 2);
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else if (cfg.protocol == PROT_TELNET && cfg.telnet_newline)
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back->special(TS_EOL);
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else
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back->send("\r", 1);
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if (ECHOING)
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c_write("\r\n", 2);
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term_buflen = 0;
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break;
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}
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/* FALLTHROUGH */
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default: /* get to this label from ^V handler */
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default_case:
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if (term_buflen >= term_bufsiz) {
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term_bufsiz = term_buflen + 256;
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term_buf = saferealloc(term_buf, term_bufsiz);
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}
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term_buf[term_buflen++] = c;
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if (ECHOING)
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pwrite((unsigned char) c);
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term_quotenext = FALSE;
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break;
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}
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}
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} else {
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if (term_buflen != 0) {
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back->send(term_buf, term_buflen);
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while (term_buflen > 0) {
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bsb(plen(term_buf[term_buflen - 1]));
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term_buflen--;
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}
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}
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if (len > 0) {
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if (ECHOING)
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c_write(buf, len);
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if (keyflag && cfg.protocol == PROT_TELNET && len == 1) {
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switch (buf[0]) {
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case CTRL('M'):
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if (cfg.protocol == PROT_TELNET && cfg.telnet_newline)
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back->special(TS_EOL);
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else
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back->send("\r", 1);
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break;
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case CTRL('?'):
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case CTRL('H'):
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if (cfg.telnet_keyboard) {
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back->special(TS_EC);
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break;
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}
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case CTRL('C'):
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if (cfg.telnet_keyboard) {
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back->special(TS_IP);
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break;
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}
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case CTRL('Z'):
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if (cfg.telnet_keyboard) {
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back->special(TS_SUSP);
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break;
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}
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default:
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back->send(buf, len);
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break;
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}
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} else
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back->send(buf, len);
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}
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}
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}
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