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1 | /* |
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. |
6 | */ |
7 | |
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8 | #include <windows.h> |
9 | #include <stdio.h> |
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10 | #include <ctype.h> |
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11 | |
12 | #include "putty.h" |
13 | |
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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)))) |
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20 | |
21 | static void c_write (char *buf, int len) { |
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22 | from_backend(0, buf, len); |
23 | } |
24 | |
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25 | static char *term_buf = NULL; |
26 | static int term_buflen = 0, term_bufsiz = 0, term_quotenext = 0; |
27 | |
28 | static int plen(unsigned char c) { |
29 | if ((c >= 32 && c <= 126) || |
30 | (c >= 160)) |
31 | return 1; |
32 | else if (c < 128) |
33 | return 2; /* ^x for some x */ |
34 | else |
35 | return 4; /* <XY> for hex XY */ |
36 | } |
37 | |
38 | static void pwrite(unsigned char c) { |
39 | if ((c >= 32 && c <= 126) || |
40 | (c >= 160)) { |
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41 | c_write(&c, 1); |
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42 | } else if (c < 128) { |
43 | char cc[2]; |
44 | cc[1] = (c == 127 ? '?' : c + 0x40); |
45 | cc[0] = '^'; |
46 | c_write(cc, 2); |
47 | } else { |
48 | char cc[5]; |
49 | sprintf(cc, "<%02X>", c); |
50 | c_write(cc, 4); |
51 | } |
52 | } |
53 | |
54 | static void bsb(int n) { |
55 | while (n--) |
56 | c_write("\010 \010", 3); |
57 | } |
58 | |
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59 | #define CTRL(x) (x^'@') |
60 | |
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61 | void ldisc_send(char *buf, int len) { |
62 | /* |
63 | * Called with len=0 when the options change. We must inform |
64 | * the front end in case it needs to know. |
65 | */ |
66 | if (len == 0) { |
67 | void ldisc_update(int echo, int edit); |
68 | ldisc_update(ECHOING, EDITING); |
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69 | } |
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70 | /* |
71 | * Either perform local editing, or just send characters. |
72 | */ |
73 | if (EDITING) { |
74 | while (len--) { |
75 | char c; |
76 | c = *buf++; |
77 | switch (term_quotenext ? ' ' : c) { |
78 | /* |
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 |
87 | * ^v: quote next char |
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 |
91 | */ |
92 | case CTRL('H'): case CTRL('?'): /* backspace/delete */ |
93 | if (term_buflen > 0) { |
94 | if (ECHOING) |
95 | bsb(plen(term_buf[term_buflen-1])); |
96 | term_buflen--; |
97 | } |
98 | break; |
99 | case CTRL('W'): /* delete word */ |
100 | while (term_buflen > 0) { |
101 | if (ECHOING) |
102 | bsb(plen(term_buf[term_buflen-1])); |
103 | term_buflen--; |
104 | if (term_buflen > 0 && |
105 | isspace(term_buf[term_buflen-1]) && |
106 | !isspace(term_buf[term_buflen])) |
107 | break; |
108 | } |
109 | break; |
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) { |
115 | if (ECHOING) |
116 | bsb(plen(term_buf[term_buflen-1])); |
117 | term_buflen--; |
118 | } |
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); |
123 | break; |
124 | case CTRL('R'): /* redraw line */ |
125 | if (ECHOING) { |
126 | int i; |
127 | c_write("^R\r\n", 4); |
128 | for (i = 0; i < term_buflen; i++) |
129 | pwrite(term_buf[i]); |
130 | } |
131 | break; |
132 | case CTRL('V'): /* quote next char */ |
133 | term_quotenext = TRUE; |
134 | break; |
135 | case CTRL('D'): /* logout or send */ |
136 | if (term_buflen == 0) { |
137 | back->special (TS_EOF); |
138 | } else { |
139 | back->send(term_buf, term_buflen); |
140 | term_buflen = 0; |
141 | } |
142 | break; |
143 | case CTRL('M'): /* send with newline */ |
144 | if (term_buflen > 0) |
145 | back->send(term_buf, term_buflen); |
146 | if (cfg.protocol == PROT_RAW) |
147 | back->send("\r\n", 2); |
148 | else |
149 | back->send("\r", 1); |
150 | if (ECHOING) |
151 | c_write("\r\n", 2); |
152 | term_buflen = 0; |
153 | break; |
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); |
158 | } |
159 | term_buf[term_buflen++] = c; |
160 | if (ECHOING) |
161 | pwrite(c); |
162 | term_quotenext = FALSE; |
163 | break; |
164 | } |
165 | } |
166 | } else { |
167 | if( term_buflen != 0 ) |
168 | { |
169 | back->send(term_buf, term_buflen); |
170 | while (term_buflen > 0) { |
171 | bsb(plen(term_buf[term_buflen-1])); |
172 | term_buflen--; |
173 | } |
174 | } |
175 | if (len > 0) { |
176 | if (ECHOING) |
177 | c_write(buf, len); |
178 | back->send(buf, len); |
179 | } |
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180 | } |
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181 | } |