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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 | |
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21 | static void c_write(char *buf, int len) |
22 | { |
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23 | from_backend(0, buf, len); |
24 | } |
25 | |
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26 | static char *term_buf = NULL; |
27 | static int term_buflen = 0, term_bufsiz = 0, term_quotenext = 0; |
28 | |
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29 | static int plen(unsigned char c) |
30 | { |
31 | if ((c >= 32 && c <= 126) || (c >= 160)) |
32 | return 1; |
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33 | else if (c < 128) |
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34 | return 2; /* ^x for some x */ |
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35 | else |
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36 | return 4; /* <XY> for hex XY */ |
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37 | } |
38 | |
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39 | static void pwrite(unsigned char c) |
40 | { |
41 | if ((c >= 32 && c <= 126) || (c >= 160)) { |
42 | c_write(&c, 1); |
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43 | } else if (c < 128) { |
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44 | char cc[2]; |
45 | cc[1] = (c == 127 ? '?' : c + 0x40); |
46 | cc[0] = '^'; |
47 | c_write(cc, 2); |
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48 | } else { |
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49 | char cc[5]; |
50 | sprintf(cc, "<%02X>", c); |
51 | c_write(cc, 4); |
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52 | } |
53 | } |
54 | |
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55 | static void bsb(int n) |
56 | { |
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57 | while (n--) |
58 | c_write("\010 \010", 3); |
59 | } |
60 | |
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61 | #define CTRL(x) (x^'@') |
62 | |
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63 | void ldisc_send(char *buf, int len) |
64 | { |
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65 | /* |
66 | * Called with len=0 when the options change. We must inform |
67 | * the front end in case it needs to know. |
68 | */ |
69 | if (len == 0) { |
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70 | void ldisc_update(int echo, int edit); |
71 | ldisc_update(ECHOING, EDITING); |
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72 | } |
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73 | /* |
74 | * Either perform local editing, or just send characters. |
75 | */ |
76 | if (EDITING) { |
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77 | while (len--) { |
78 | char c; |
79 | c = *buf++; |
80 | switch (term_quotenext ? ' ' : c) { |
81 | /* |
82 | * ^h/^?: delete one char and output one BSB |
83 | * ^w: delete, and output BSBs, to return to last |
84 | * space/nonspace boundary |
85 | * ^u: delete, and output BSBs, to return to BOL |
86 | * ^c: Do a ^u then send a telnet IP |
87 | * ^z: Do a ^u then send a telnet SUSP |
88 | * ^\: Do a ^u then send a telnet ABORT |
89 | * ^r: echo "^R\n" and redraw line |
90 | * ^v: quote next char |
91 | * ^d: if at BOL, end of file and close connection, |
92 | * else send line and reset to BOL |
93 | * ^m: send line-plus-\r\n and reset to BOL |
94 | */ |
95 | case CTRL('H'): |
96 | case CTRL('?'): /* backspace/delete */ |
97 | if (term_buflen > 0) { |
98 | if (ECHOING) |
99 | bsb(plen(term_buf[term_buflen - 1])); |
100 | term_buflen--; |
101 | } |
102 | break; |
103 | case CTRL('W'): /* delete word */ |
104 | while (term_buflen > 0) { |
105 | if (ECHOING) |
106 | bsb(plen(term_buf[term_buflen - 1])); |
107 | term_buflen--; |
108 | if (term_buflen > 0 && |
109 | isspace(term_buf[term_buflen - 1]) && |
110 | !isspace(term_buf[term_buflen])) |
111 | break; |
112 | } |
113 | break; |
114 | case CTRL('U'): /* delete line */ |
115 | case CTRL('C'): /* Send IP */ |
116 | case CTRL('\\'): /* Quit */ |
117 | case CTRL('Z'): /* Suspend */ |
118 | while (term_buflen > 0) { |
119 | if (ECHOING) |
120 | bsb(plen(term_buf[term_buflen - 1])); |
121 | term_buflen--; |
122 | } |
123 | back->special(TS_EL); |
124 | if (c == CTRL('C')) |
125 | back->special(TS_IP); |
126 | if (c == CTRL('Z')) |
127 | back->special(TS_SUSP); |
128 | if (c == CTRL('\\')) |
129 | back->special(TS_ABORT); |
130 | break; |
131 | case CTRL('R'): /* redraw line */ |
132 | if (ECHOING) { |
133 | int i; |
134 | c_write("^R\r\n", 4); |
135 | for (i = 0; i < term_buflen; i++) |
136 | pwrite(term_buf[i]); |
137 | } |
138 | break; |
139 | case CTRL('V'): /* quote next char */ |
140 | term_quotenext = TRUE; |
141 | break; |
142 | case CTRL('D'): /* logout or send */ |
143 | if (term_buflen == 0) { |
144 | back->special(TS_EOF); |
145 | } else { |
146 | back->send(term_buf, term_buflen); |
147 | term_buflen = 0; |
148 | } |
149 | break; |
150 | case CTRL('M'): /* send with newline */ |
151 | if (term_buflen > 0) |
152 | back->send(term_buf, term_buflen); |
153 | if (cfg.protocol == PROT_RAW) |
154 | back->send("\r\n", 2); |
155 | else |
156 | back->send("\r", 1); |
157 | if (ECHOING) |
158 | c_write("\r\n", 2); |
159 | term_buflen = 0; |
160 | break; |
161 | default: /* get to this label from ^V handler */ |
162 | if (term_buflen >= term_bufsiz) { |
163 | term_bufsiz = term_buflen + 256; |
164 | term_buf = saferealloc(term_buf, term_bufsiz); |
165 | } |
166 | term_buf[term_buflen++] = c; |
167 | if (ECHOING) |
168 | pwrite(c); |
169 | term_quotenext = FALSE; |
170 | break; |
171 | } |
172 | } |
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173 | } else { |
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174 | if (term_buflen != 0) { |
175 | back->send(term_buf, term_buflen); |
176 | while (term_buflen > 0) { |
177 | bsb(plen(term_buf[term_buflen - 1])); |
178 | term_buflen--; |
179 | } |
180 | } |
181 | if (len > 0) { |
182 | if (ECHOING) |
183 | c_write(buf, len); |
184 | back->send(buf, len); |
185 | } |
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186 | } |
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187 | } |