-#include <windows.h>
+/*
+ * 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"
-/*
- * ldisc.c: PuTTY line disciplines
- */
+#define ECHOING (ldisc->localecho == FORCE_ON || \
+ (ldisc->localecho == AUTO && \
+ (ldisc->back->ldisc(ldisc->backhandle, LD_ECHO) || \
+ term_ldisc(ldisc->term, LD_ECHO))))
+#define EDITING (ldisc->localedit == FORCE_ON || \
+ (ldisc->localedit == AUTO && \
+ (ldisc->back->ldisc(ldisc->backhandle, LD_EDIT) || \
+ term_ldisc(ldisc->term, LD_EDIT))))
-static void c_write (char *buf, int len) {
- while (len--) {
- int new_head = (inbuf_head + 1) & INBUF_MASK;
- if (new_head != inbuf_reap) {
- inbuf[inbuf_head] = *buf++;
- inbuf_head = new_head;
- }
- }
+static void c_write(Ldisc ldisc, char *buf, int len)
+{
+ from_backend(ldisc->frontend, 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;
+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 */
+ return 2; /* ^x for some x */
+ else if (in_utf(ldisc->term) && c >= 0xC0)
+ return 1; /* UTF-8 introducer character
+ * (FIXME: combining / wide chars) */
+ else if (in_utf(ldisc->term) && c >= 0x80 && c < 0xC0)
+ return 0; /* UTF-8 followup character */
else
- return 4; /* <XY> for hex XY */
+ return 4; /* <XY> hex representation */
}
-static void pwrite(unsigned char c) {
+static void pwrite(Ldisc ldisc, unsigned char c)
+{
if ((c >= 32 && c <= 126) ||
- (c >= 160)) {
- char cc = (char)c;
- c_write(&cc, 1);
+ (!in_utf(ldisc->term) && c >= 0xA0) ||
+ (in_utf(ldisc->term) && c >= 0x80)) {
+ c_write(ldisc, (char *)&c, 1);
} else if (c < 128) {
- char cc[2];
- cc[1] = (c == 127 ? '?' : c + 0x40);
- cc[0] = '^';
- c_write(cc, 2);
+ 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(cc, 4);
+ char cc[5];
+ sprintf(cc, "<%02X>", c);
+ c_write(ldisc, cc, 4);
}
}
-static void bsb(int n) {
+static int char_start(Ldisc ldisc, unsigned char c)
+{
+ if (in_utf(ldisc->term))
+ return (c < 0x80 || c >= 0xC0);
+ else
+ return 1;
+}
+
+static void bsb(Ldisc ldisc, int n)
+{
while (n--)
- c_write("\010 \010", 3);
+ c_write(ldisc, "\010 \010", 3);
}
#define CTRL(x) (x^'@')
+#define KCTRL(x) ((x^'@') | 0x100)
-static void term_send(char *buf, int len) {
- 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) {
- bsb(plen(term_buf[term_buflen-1]));
- term_buflen--;
- }
- break;
- case CTRL('W'): /* delete word */
- while (term_buflen > 0) {
- bsb(plen(term_buf[term_buflen-1]));
- term_buflen--;
- if (term_buflen > 0 &&
- isspace(term_buf[term_buflen-1]) &&
- !isspace(term_buf[term_buflen]))
+void *ldisc_create(Conf *conf, Terminal *term,
+ Backend *back, void *backhandle,
+ void *frontend)
+{
+ Ldisc ldisc = snew(struct ldisc_tag);
+
+ ldisc->buf = NULL;
+ ldisc->buflen = 0;
+ ldisc->bufsiz = 0;
+ ldisc->quotenext = 0;
+
+ ldisc->back = back;
+ ldisc->backhandle = backhandle;
+ ldisc->term = term;
+ ldisc->frontend = frontend;
+
+ ldisc_configure(ldisc, conf);
+
+ /* Link ourselves into the backend and the terminal */
+ if (term)
+ term->ldisc = ldisc;
+ if (back)
+ back->provide_ldisc(backhandle, ldisc);
+
+ return ldisc;
+}
+
+void ldisc_configure(void *handle, Conf *conf)
+{
+ Ldisc ldisc = (Ldisc) handle;
+
+ ldisc->telnet_keyboard = conf_get_int(conf, CONF_telnet_keyboard);
+ ldisc->telnet_newline = conf_get_int(conf, CONF_telnet_newline);
+ ldisc->protocol = conf_get_int(conf, CONF_protocol);
+ ldisc->localecho = conf_get_int(conf, CONF_localecho);
+ ldisc->localedit = conf_get_int(conf, CONF_localedit);
+}
+
+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 = (unsigned char)(*buf++) + keyflag;
+ if (!interactive && c == '\r')
+ c += KCTRL('@');
+ switch (ldisc->quotenext ? ' ' : c) {
+ /*
+ * ^h/^?: delete, and output BSBs, to return to
+ * last character boundary (in UTF-8 mode this may
+ * be more than one byte)
+ * ^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) {
+ do {
+ if (ECHOING)
+ bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1]));
+ ldisc->buflen--;
+ } while (!char_start(ldisc, ldisc->buf[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((unsigned char)ldisc->buf[ldisc->buflen-1]) &&
+ !isspace((unsigned char)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->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->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->protocol == PROT_RAW)
+ ldisc->back->send(ldisc->backhandle, "\r\n", 2);
+ else if (ldisc->protocol == PROT_TELNET && ldisc->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 = sresize(ldisc->buf, ldisc->bufsiz, char);
+ }
+ ldisc->buf[ldisc->buflen++] = c;
+ if (ECHOING)
+ pwrite(ldisc, (unsigned char) c);
+ ldisc->quotenext = FALSE;
+ break;
}
- break;
- case CTRL('U'): /* delete line */
- case CTRL('C'): /* Send IP */
- case CTRL('\\'): /* Quit */
- case CTRL('Z'): /* Suspend */
- while (term_buflen > 0) {
- 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 */
- c_write("^R\r\n", 4);
- {
- int i;
- 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 */
- back->send(term_buf, term_buflen);
- if (cfg.protocol == PROT_RAW)
- back->send("\r\n", 2);
- else
- back->send("\r", 1);
- 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);
+ }
+ } 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--;
}
- term_buf[term_buflen++] = c;
- pwrite(c);
- term_quotenext = FALSE;
- break;
}
- }
-}
+ if (len > 0) {
+ if (ECHOING)
+ c_write(ldisc, buf, len);
+ if (keyflag && ldisc->protocol == PROT_TELNET && len == 1) {
+ switch (buf[0]) {
+ case CTRL('M'):
+ if (ldisc->protocol == PROT_TELNET && ldisc->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->telnet_keyboard) {
+ ldisc->back->special(ldisc->backhandle, TS_EC);
+ break;
+ }
+ case CTRL('C'):
+ if (ldisc->telnet_keyboard) {
+ ldisc->back->special(ldisc->backhandle, TS_IP);
+ break;
+ }
+ case CTRL('Z'):
+ if (ldisc->telnet_keyboard) {
+ ldisc->back->special(ldisc->backhandle, TS_SUSP);
+ break;
+ }
-static void simple_send(char *buf, int len) {
- if( term_buflen != 0 )
- {
- back->send(term_buf, term_buflen);
- while (term_buflen > 0) {
- bsb(plen(term_buf[term_buflen-1]));
- term_buflen--;
+ default:
+ ldisc->back->send(ldisc->backhandle, buf, len);
+ break;
+ }
+ } else
+ ldisc->back->send(ldisc->backhandle, buf, len);
}
}
- back->send(buf, len);
}
-
-Ldisc ldisc_term = { term_send };
-Ldisc ldisc_simple = { simple_send };
projects / u / mdw / putty / blobdiff