зеркало из https://github.com/github/putty.git
350 строки
10 KiB
C
350 строки
10 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 <assert.h>
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#include "putty.h"
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#include "terminal.h"
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#include "ldisc.h"
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#define ECHOING (ldisc->localecho == FORCE_ON || \
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(ldisc->localecho == AUTO && \
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(backend_ldisc_option_state(ldisc->backend, LD_ECHO) || \
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term_ldisc(ldisc->term, LD_ECHO))))
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#define EDITING (ldisc->localedit == FORCE_ON || \
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(ldisc->localedit == AUTO && \
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(backend_ldisc_option_state(ldisc->backend, LD_EDIT) || \
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term_ldisc(ldisc->term, LD_EDIT))))
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static void c_write(Ldisc *ldisc, const void *buf, int len)
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{
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seat_stdout(ldisc->seat, buf, len);
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}
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static int plen(Ldisc *ldisc, unsigned char c)
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{
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if ((c >= 32 && c <= 126) || (c >= 160 && !in_utf(ldisc->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 if (in_utf(ldisc->term) && c >= 0xC0)
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return 1; /* UTF-8 introducer character
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* (FIXME: combining / wide chars) */
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else if (in_utf(ldisc->term) && c >= 0x80 && c < 0xC0)
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return 0; /* UTF-8 followup character */
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else
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return 4; /* <XY> hex representation */
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}
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static void pwrite(Ldisc *ldisc, unsigned char c)
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{
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if ((c >= 32 && c <= 126) ||
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(!in_utf(ldisc->term) && c >= 0xA0) ||
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(in_utf(ldisc->term) && c >= 0x80)) {
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c_write(ldisc, &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(ldisc, 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(ldisc, cc, 4);
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}
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}
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static bool char_start(Ldisc *ldisc, unsigned char c)
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{
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if (in_utf(ldisc->term))
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return (c < 0x80 || c >= 0xC0);
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else
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return true;
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}
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static void bsb(Ldisc *ldisc, int n)
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{
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while (n--)
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c_write(ldisc, "\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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Ldisc *ldisc_create(Conf *conf, Terminal *term, Backend *backend, Seat *seat)
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{
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Ldisc *ldisc = snew(Ldisc);
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ldisc->buf = NULL;
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ldisc->buflen = 0;
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ldisc->bufsiz = 0;
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ldisc->quotenext = false;
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ldisc->backend = backend;
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ldisc->term = term;
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ldisc->seat = seat;
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ldisc_configure(ldisc, conf);
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/* Link ourselves into the backend and the terminal */
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if (term)
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term->ldisc = ldisc;
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if (backend)
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backend_provide_ldisc(backend, ldisc);
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return ldisc;
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}
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void ldisc_configure(Ldisc *ldisc, Conf *conf)
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{
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ldisc->telnet_keyboard = conf_get_bool(conf, CONF_telnet_keyboard);
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ldisc->telnet_newline = conf_get_bool(conf, CONF_telnet_newline);
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ldisc->protocol = conf_get_int(conf, CONF_protocol);
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ldisc->localecho = conf_get_int(conf, CONF_localecho);
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ldisc->localedit = conf_get_int(conf, CONF_localedit);
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}
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void ldisc_free(Ldisc *ldisc)
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{
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if (ldisc->term)
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ldisc->term->ldisc = NULL;
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if (ldisc->backend)
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backend_provide_ldisc(ldisc->backend, NULL);
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if (ldisc->buf)
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sfree(ldisc->buf);
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sfree(ldisc);
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}
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void ldisc_echoedit_update(Ldisc *ldisc)
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{
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seat_echoedit_update(ldisc->seat, ECHOING, EDITING);
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}
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void ldisc_send(Ldisc *ldisc, const void *vbuf, int len, bool interactive)
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{
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const char *buf = (const char *)vbuf;
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int keyflag = 0;
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assert(ldisc->term);
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assert(len);
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if (interactive) {
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/*
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* Interrupt a paste from the clipboard, if one was in
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* progress when the user pressed a key. This is easier than
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* buffering the current piece of data and saving it until the
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* terminal has finished pasting, and has the potential side
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* benefit of permitting a user to cancel an accidental huge
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* paste.
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*/
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term_nopaste(ldisc->term);
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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 = (unsigned char)(*buf++) + keyflag;
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if (!interactive && c == '\r')
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c += KCTRL('@');
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switch (ldisc->quotenext ? ' ' : c) {
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/*
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* ^h/^?: delete, and output BSBs, to return to
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* last character boundary (in UTF-8 mode this may
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* be more than one byte)
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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 (ldisc->buflen > 0) {
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do {
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if (ECHOING)
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bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1]));
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ldisc->buflen--;
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} while (!char_start(ldisc, ldisc->buf[ldisc->buflen]));
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}
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break;
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case CTRL('W'): /* delete word */
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while (ldisc->buflen > 0) {
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if (ECHOING)
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bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1]));
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ldisc->buflen--;
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if (ldisc->buflen > 0 &&
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isspace((unsigned char)ldisc->buf[ldisc->buflen-1]) &&
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!isspace((unsigned char)ldisc->buf[ldisc->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 (ldisc->buflen > 0) {
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if (ECHOING)
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bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1]));
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ldisc->buflen--;
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}
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backend_special(ldisc->backend, SS_EL, 0);
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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 (!ldisc->telnet_keyboard)
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goto default_case;
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if (c == CTRL('C'))
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backend_special(ldisc->backend, SS_IP, 0);
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if (c == CTRL('Z'))
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backend_special(ldisc->backend, SS_SUSP, 0);
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if (c == CTRL('\\'))
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backend_special(ldisc->backend, SS_ABORT, 0);
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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(ldisc, "^R\r\n", 4);
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for (i = 0; i < ldisc->buflen; i++)
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pwrite(ldisc, ldisc->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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ldisc->quotenext = true;
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break;
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case CTRL('D'): /* logout or send */
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if (ldisc->buflen == 0) {
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backend_special(ldisc->backend, SS_EOF, 0);
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} else {
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backend_send(ldisc->backend, ldisc->buf, ldisc->buflen);
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ldisc->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 (ldisc->protocol == PROT_RAW &&
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ldisc->buflen > 0 && ldisc->buf[ldisc->buflen - 1] == '\r') {
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if (ECHOING)
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bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1]));
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ldisc->buflen--;
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/* FALLTHROUGH */
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case KCTRL('M'): /* send with newline */
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if (ldisc->buflen > 0)
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backend_send(ldisc->backend,
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ldisc->buf, ldisc->buflen);
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if (ldisc->protocol == PROT_RAW)
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backend_send(ldisc->backend, "\r\n", 2);
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else if (ldisc->protocol == PROT_TELNET && ldisc->telnet_newline)
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backend_special(ldisc->backend, SS_EOL, 0);
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else
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backend_send(ldisc->backend, "\r", 1);
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if (ECHOING)
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c_write(ldisc, "\r\n", 2);
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ldisc->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 (ldisc->buflen >= ldisc->bufsiz) {
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ldisc->bufsiz = ldisc->buflen + 256;
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ldisc->buf = sresize(ldisc->buf, ldisc->bufsiz, char);
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}
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ldisc->buf[ldisc->buflen++] = c;
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if (ECHOING)
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pwrite(ldisc, (unsigned char) c);
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ldisc->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 (ldisc->buflen != 0) {
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backend_send(ldisc->backend, ldisc->buf, ldisc->buflen);
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while (ldisc->buflen > 0) {
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bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1]));
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ldisc->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(ldisc, buf, len);
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if (keyflag && ldisc->protocol == PROT_TELNET && len == 1) {
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switch (buf[0]) {
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case CTRL('M'):
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if (ldisc->protocol == PROT_TELNET && ldisc->telnet_newline)
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backend_special(ldisc->backend, SS_EOL, 0);
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else
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backend_send(ldisc->backend, "\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 (ldisc->telnet_keyboard) {
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backend_special(ldisc->backend, SS_EC, 0);
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break;
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}
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case CTRL('C'):
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if (ldisc->telnet_keyboard) {
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backend_special(ldisc->backend, SS_IP, 0);
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break;
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}
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case CTRL('Z'):
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if (ldisc->telnet_keyboard) {
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backend_special(ldisc->backend, SS_SUSP, 0);
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break;
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}
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default:
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backend_send(ldisc->backend, buf, len);
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break;
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}
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} else
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backend_send(ldisc->backend, buf, len);
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}
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}
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}
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