7 * ldisc.c: PuTTY line disciplines
10 static void c_write (char *buf, int len) {
12 int new_head = (inbuf_head + 1) & INBUF_MASK;
13 int c = (unsigned char) *buf;
14 if (new_head != inbuf_reap) {
15 inbuf[inbuf_head] = *buf++;
16 inbuf_head = new_head;
21 static char *term_buf = NULL;
22 static int term_buflen = 0, term_bufsiz = 0, term_quotenext = 0;
24 static int plen(unsigned char c) {
25 if ((c >= 32 && c <= 126) ||
29 return 2; /* ^x for some x */
31 return 4; /* <XY> for hex XY */
34 static void pwrite(unsigned char c) {
35 if ((c >= 32 && c <= 126) ||
41 cc[1] = (c == 127 ? '?' : c + 0x40);
46 sprintf(cc, "<%02X>", c);
51 static void bsb(int n) {
53 c_write("\010 \010", 3);
56 static void term_send(char *buf, int len) {
60 switch (term_quotenext ? ' ' : c) {
62 * ^h/^?: delete one char and output one BSB
63 * ^w: delete, and output BSBs, to return to last space/nonspace
65 * ^u: delete, and output BSBs, to return to BOL
66 * ^r: echo "^R\n" and redraw line
68 * ^d: if at BOL, end of file and close connection, else send line
70 * ^m/^j: send line-plus-\r\n and reset to BOL
72 case 8: case 127: /* backspace/delete */
73 if (term_buflen > 0) {
74 bsb(plen(term_buf[term_buflen-1]));
78 case 23: /* ^W delete word */
79 while (term_buflen > 0) {
80 bsb(plen(term_buf[term_buflen-1]));
82 if (term_buflen > 0 &&
83 isspace(term_buf[term_buflen-1]) &&
84 !isspace(term_buf[term_buflen]))
88 case 21: /* ^U delete line */
89 while (term_buflen > 0) {
90 bsb(plen(term_buf[term_buflen-1]));
94 case 18: /* ^R redraw line */
98 for (i = 0; i < term_buflen; i++)
102 case 22: /* ^V quote next char */
103 term_quotenext = TRUE;
105 case 4: /* ^D logout or send */
106 if (term_buflen == 0) {
109 back->send(term_buf, term_buflen);
113 case 13: case 10: /* ^M/^J send with newline */
114 back->send(term_buf, term_buflen);
115 back->send("\r\n", 2);
119 default: /* get to this label from ^V handler */
120 if (term_buflen >= term_bufsiz) {
121 term_bufsiz = term_buflen + 256;
122 term_buf = saferealloc(term_buf, term_bufsiz);
124 term_buf[term_buflen++] = c;
126 term_quotenext = FALSE;
132 static void simple_send(char *buf, int len) {
133 back->send(buf, len);
136 Ldisc ldisc_term = { term_send };
137 Ldisc ldisc_simple = { simple_send };