8 * ldisc.c: PuTTY line disciplines
11 static void c_write (char *buf
, int len
) {
13 int new_head
= (inbuf_head
+ 1) & INBUF_MASK
;
14 int c
= (unsigned char) *buf
;
15 if (new_head
!= inbuf_reap
) {
16 inbuf
[inbuf_head
] = *buf
++;
17 inbuf_head
= new_head
;
22 static char *term_buf
= NULL
;
23 static int term_buflen
= 0, term_bufsiz
= 0, term_quotenext
= 0;
25 static int plen(unsigned char c
) {
26 if ((c
>= 32 && c
<= 126) ||
30 return 2; /* ^x for some x */
32 return 4; /* <XY> for hex XY */
35 static void pwrite(unsigned char c
) {
36 if ((c
>= 32 && c
<= 126) ||
42 cc
[1] = (c
== 127 ?
'?' : c
+ 0x40);
47 sprintf(cc
, "<%02X>", c
);
52 static void bsb(int n
) {
54 c_write("\010 \010", 3);
57 static void term_send(char *buf
, int len
) {
61 switch (term_quotenext ?
' ' : c
) {
63 * ^h/^?: delete one char and output one BSB
64 * ^w: delete, and output BSBs, to return to last space/nonspace
66 * ^u: delete, and output BSBs, to return to BOL
67 * ^r: echo "^R\n" and redraw line
69 * ^d: if at BOL, end of file and close connection, else send line
71 * ^m/^j: send line-plus-\r\n and reset to BOL
73 case 8: case 127: /* backspace/delete */
74 if (term_buflen
> 0) {
75 bsb(plen(term_buf
[term_buflen
-1]));
79 case 23: /* ^W delete word */
80 while (term_buflen
> 0) {
81 bsb(plen(term_buf
[term_buflen
-1]));
83 if (term_buflen
> 0 &&
84 isspace(term_buf
[term_buflen
-1]) &&
85 !isspace(term_buf
[term_buflen
]))
89 case 21: /* ^U delete line */
90 while (term_buflen
> 0) {
91 bsb(plen(term_buf
[term_buflen
-1]));
95 case 18: /* ^R redraw line */
99 for (i
= 0; i
< term_buflen
; i
++)
103 case 22: /* ^V quote next char */
104 term_quotenext
= TRUE
;
106 case 4: /* ^D logout or send */
107 if (term_buflen
== 0) {
110 back
->send(term_buf
, term_buflen
);
114 case 13: case 10: /* ^M/^J send with newline */
115 back
->send(term_buf
, term_buflen
);
116 back
->send("\r\n", 2);
120 default: /* get to this label from ^V handler */
121 if (term_buflen
>= term_bufsiz
) {
122 term_bufsiz
= term_buflen
+ 256;
123 term_buf
= saferealloc(term_buf
, term_bufsiz
);
125 term_buf
[term_buflen
++] = c
;
127 term_quotenext
= FALSE
;
133 static void simple_send(char *buf
, int len
) {
134 back
->send(buf
, len
);
137 Ldisc ldisc_term
= { term_send
};
138 Ldisc ldisc_simple
= { simple_send
};