зеркало из https://github.com/github/putty.git
258 строки
6.6 KiB
C
258 строки
6.6 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 <windows.h>
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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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#define ECHOING (cfg.localecho == LD_YES || \
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(cfg.localecho == LD_BACKEND && \
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(back->ldisc(LD_ECHO) || term_ldisc(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(LD_EDIT))))
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static void c_write(char *buf, int len)
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{
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from_backend(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))
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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)) {
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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)
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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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}
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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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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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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)
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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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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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back->special(TS_EOL);
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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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