2 * ldisc.c: PuTTY line discipline. Sits between the input coming
3 * from keypresses in the window, and the output channel leading to
4 * the back end. Implements echo and/or local line editing,
5 * depending on what's currently configured.
14 #define ECHOING (cfg.localecho == LD_YES || \
15 (cfg.localecho == LD_BACKEND && \
16 (back->ldisc(LD_ECHO) || term_ldisc(LD_ECHO))))
17 #define EDITING (cfg.localedit == LD_YES || \
18 (cfg.localedit == LD_BACKEND && \
19 (back->ldisc(LD_EDIT) || term_ldisc(LD_EDIT))))
21 static void c_write(char *buf
, int len
)
23 from_backend(0, buf
, len
);
26 static char *term_buf
= NULL
;
27 static int term_buflen
= 0, term_bufsiz
= 0, term_quotenext
= 0;
29 static int plen(unsigned char c
)
31 if ((c
>= 32 && c
<= 126) || (c
>= 160 && !in_utf
))
34 return 2; /* ^x for some x */
36 return 4; /* <XY> for hex XY */
39 static void pwrite(unsigned char c
)
41 if ((c
>= 32 && c
<= 126) || (c
>= 160 && !in_utf
)) {
45 cc
[1] = (c
== 127 ?
'?' : c
+ 0x40);
50 sprintf(cc
, "<%02X>", c
);
55 static void bsb(int n
)
58 c_write("\010 \010", 3);
61 #define CTRL(x) (x^'@')
62 #define KCTRL(x) ((x^'@') | 0x100)
64 void ldisc_send(char *buf
, int len
, int interactive
)
68 * Called with len=0 when the options change. We must inform
69 * the front end in case it needs to know.
72 void ldisc_update(int echo
, int edit
);
73 ldisc_update(ECHOING
, EDITING
);
76 * Less than zero means null terminated special string.
83 * Either perform local editing, or just send characters.
89 if (!interactive
&& c
== '\r')
91 switch (term_quotenext ?
' ' : c
) {
93 * ^h/^?: delete one char and output one BSB
94 * ^w: delete, and output BSBs, to return to last
95 * space/nonspace boundary
96 * ^u: delete, and output BSBs, to return to BOL
97 * ^c: Do a ^u then send a telnet IP
98 * ^z: Do a ^u then send a telnet SUSP
99 * ^\: Do a ^u then send a telnet ABORT
100 * ^r: echo "^R\n" and redraw line
101 * ^v: quote next char
102 * ^d: if at BOL, end of file and close connection,
103 * else send line and reset to BOL
104 * ^m: send line-plus-\r\n and reset to BOL
107 case KCTRL('?'): /* backspace/delete */
108 if (term_buflen
> 0) {
110 bsb(plen(term_buf
[term_buflen
- 1]));
114 case CTRL('W'): /* delete word */
115 while (term_buflen
> 0) {
117 bsb(plen(term_buf
[term_buflen
- 1]));
119 if (term_buflen
> 0 &&
120 isspace(term_buf
[term_buflen
- 1]) &&
121 !isspace(term_buf
[term_buflen
]))
125 case CTRL('U'): /* delete line */
126 case CTRL('C'): /* Send IP */
127 case CTRL('\\'): /* Quit */
128 case CTRL('Z'): /* Suspend */
129 while (term_buflen
> 0) {
131 bsb(plen(term_buf
[term_buflen
- 1]));
134 back
->special(TS_EL
);
136 * We don't send IP, SUSP or ABORT if the user has
137 * configured telnet specials off! This breaks
140 if (!cfg
.telnet_keyboard
)
143 back
->special(TS_IP
);
145 back
->special(TS_SUSP
);
147 back
->special(TS_ABORT
);
149 case CTRL('R'): /* redraw line */
152 c_write("^R\r\n", 4);
153 for (i
= 0; i
< term_buflen
; i
++)
157 case CTRL('V'): /* quote next char */
158 term_quotenext
= TRUE
;
160 case CTRL('D'): /* logout or send */
161 if (term_buflen
== 0) {
162 back
->special(TS_EOF
);
164 back
->send(term_buf
, term_buflen
);
169 * This particularly hideous bit of code from RDB
170 * allows ordinary ^M^J to do the same thing as
171 * magic-^M when in Raw protocol. The line `case
172 * KCTRL('M'):' is _inside_ the if block. Thus:
174 * - receiving regular ^M goes straight to the
175 * default clause and inserts as a literal ^M.
176 * - receiving regular ^J _not_ directly after a
177 * literal ^M (or not in Raw protocol) fails the
178 * if condition, leaps to the bottom of the if,
179 * and falls through into the default clause
181 * - receiving regular ^J just after a literal ^M
182 * in Raw protocol passes the if condition,
183 * deletes the literal ^M, and falls through
184 * into the magic-^M code
185 * - receiving a magic-^M empties the line buffer,
186 * signals end-of-line in one of the various
187 * entertaining ways, and _doesn't_ fall out of
188 * the bottom of the if and through to the
189 * default clause because of the break.
192 if (cfg
.protocol
== PROT_RAW
&&
193 term_buflen
> 0 && term_buf
[term_buflen
- 1] == '\r') {
195 bsb(plen(term_buf
[term_buflen
- 1]));
198 case KCTRL('M'): /* send with newline */
200 back
->send(term_buf
, term_buflen
);
201 if (cfg
.protocol
== PROT_RAW
)
202 back
->send("\r\n", 2);
203 else if (cfg
.protocol
== PROT_TELNET
&& cfg
.telnet_newline
)
204 back
->special(TS_EOL
);
213 default: /* get to this label from ^V handler */
215 if (term_buflen
>= term_bufsiz
) {
216 term_bufsiz
= term_buflen
+ 256;
217 term_buf
= saferealloc(term_buf
, term_bufsiz
);
219 term_buf
[term_buflen
++] = c
;
221 pwrite((unsigned char) c
);
222 term_quotenext
= FALSE
;
227 if (term_buflen
!= 0) {
228 back
->send(term_buf
, term_buflen
);
229 while (term_buflen
> 0) {
230 bsb(plen(term_buf
[term_buflen
- 1]));
237 if (keyflag
&& cfg
.protocol
== PROT_TELNET
&& len
== 1) {
240 if (cfg
.protocol
== PROT_TELNET
&& cfg
.telnet_newline
)
241 back
->special(TS_EOL
);
247 if (cfg
.telnet_keyboard
) {
248 back
->special(TS_EC
);
252 if (cfg
.telnet_keyboard
) {
253 back
->special(TS_IP
);
257 if (cfg
.telnet_keyboard
) {
258 back
->special(TS_SUSP
);
263 back
->send(buf
, len
);
267 back
->send(buf
, len
);