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 };