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) {
22 from_backend(0, buf, len);
25 static char *term_buf = NULL;
26 static int term_buflen = 0, term_bufsiz = 0, term_quotenext = 0;
28 static int plen(unsigned char c) {
29 if ((c >= 32 && c <= 126) ||
33 return 2; /* ^x for some x */
35 return 4; /* <XY> for hex XY */
38 static void pwrite(unsigned char c) {
39 if ((c >= 32 && c <= 126) ||
44 cc[1] = (c == 127 ? '?' : c + 0x40);
49 sprintf(cc, "<%02X>", c);
54 static void bsb(int n) {
56 c_write("\010 \010", 3);
59 #define CTRL(x) (x^'@')
61 void ldisc_send(char *buf, int len) {
63 * Called with len=0 when the options change. We must inform
64 * the front end in case it needs to know.
67 void ldisc_update(int echo, int edit);
68 ldisc_update(ECHOING, EDITING);
71 * Either perform local editing, or just send characters.
77 switch (term_quotenext ? ' ' : c) {
79 * ^h/^?: delete one char and output one BSB
80 * ^w: delete, and output BSBs, to return to last
81 * space/nonspace boundary
82 * ^u: delete, and output BSBs, to return to BOL
83 * ^c: Do a ^u then send a telnet IP
84 * ^z: Do a ^u then send a telnet SUSP
85 * ^\: Do a ^u then send a telnet ABORT
86 * ^r: echo "^R\n" and redraw line
88 * ^d: if at BOL, end of file and close connection,
89 * else send line and reset to BOL
90 * ^m: send line-plus-\r\n and reset to BOL
92 case CTRL('H'): case CTRL('?'): /* backspace/delete */
93 if (term_buflen > 0) {
95 bsb(plen(term_buf[term_buflen-1]));
99 case CTRL('W'): /* delete word */
100 while (term_buflen > 0) {
102 bsb(plen(term_buf[term_buflen-1]));
104 if (term_buflen > 0 &&
105 isspace(term_buf[term_buflen-1]) &&
106 !isspace(term_buf[term_buflen]))
110 case CTRL('U'): /* delete line */
111 case CTRL('C'): /* Send IP */
112 case CTRL('\\'): /* Quit */
113 case CTRL('Z'): /* Suspend */
114 while (term_buflen > 0) {
116 bsb(plen(term_buf[term_buflen-1]));
119 back->special (TS_EL);
120 if( c == CTRL('C') ) back->special (TS_IP);
121 if( c == CTRL('Z') ) back->special (TS_SUSP);
122 if( c == CTRL('\\') ) back->special (TS_ABORT);
124 case CTRL('R'): /* redraw line */
127 c_write("^R\r\n", 4);
128 for (i = 0; i < term_buflen; i++)
132 case CTRL('V'): /* quote next char */
133 term_quotenext = TRUE;
135 case CTRL('D'): /* logout or send */
136 if (term_buflen == 0) {
137 back->special (TS_EOF);
139 back->send(term_buf, term_buflen);
143 case CTRL('M'): /* send with newline */
145 back->send(term_buf, term_buflen);
146 if (cfg.protocol == PROT_RAW)
147 back->send("\r\n", 2);
154 default: /* get to this label from ^V handler */
155 if (term_buflen >= term_bufsiz) {
156 term_bufsiz = term_buflen + 256;
157 term_buf = saferealloc(term_buf, term_bufsiz);
159 term_buf[term_buflen++] = c;
162 term_quotenext = FALSE;
167 if( term_buflen != 0 )
169 back->send(term_buf, term_buflen);
170 while (term_buflen > 0) {
171 bsb(plen(term_buf[term_buflen-1]));
178 back->send(buf, len);