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4f4122db WJ |
1 | /* |
2 | * Copyright (c) 1980 Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #ifndef lint | |
35 | static char sccsid[] = "@(#)tty.c 5.12 (Berkeley) 4/1/91"; | |
36 | #endif /* not lint */ | |
37 | ||
38 | /* | |
39 | * Mail -- a mail program | |
40 | * | |
41 | * Generally useful tty stuff. | |
42 | */ | |
43 | ||
44 | #include "rcv.h" | |
45 | ||
46 | static int c_erase; /* Current erase char */ | |
47 | static int c_kill; /* Current kill char */ | |
48 | static jmp_buf rewrite; /* Place to go when continued */ | |
49 | static jmp_buf intjmp; /* Place to go when interrupted */ | |
50 | #ifndef TIOCSTI | |
51 | static int ttyset; /* We must now do erase/kill */ | |
52 | #endif | |
53 | ||
54 | /* | |
55 | * Read all relevant header fields. | |
56 | */ | |
57 | ||
58 | grabh(hp, gflags) | |
59 | struct header *hp; | |
60 | { | |
61 | struct sgttyb ttybuf; | |
62 | sig_t saveint; | |
63 | #ifndef TIOCSTI | |
64 | sig_t savequit; | |
65 | #endif | |
66 | sig_t savetstp; | |
67 | sig_t savettou; | |
68 | sig_t savettin; | |
69 | int errs; | |
70 | void ttyint(); | |
71 | ||
72 | savetstp = signal(SIGTSTP, SIG_DFL); | |
73 | savettou = signal(SIGTTOU, SIG_DFL); | |
74 | savettin = signal(SIGTTIN, SIG_DFL); | |
75 | errs = 0; | |
76 | #ifndef TIOCSTI | |
77 | ttyset = 0; | |
78 | #endif | |
79 | if (ioctl(fileno(stdin), TIOCGETP, &ttybuf) < 0) { | |
80 | perror("gtty"); | |
81 | return(-1); | |
82 | } | |
83 | c_erase = ttybuf.sg_erase; | |
84 | c_kill = ttybuf.sg_kill; | |
85 | #ifndef TIOCSTI | |
86 | ttybuf.sg_erase = 0; | |
87 | ttybuf.sg_kill = 0; | |
88 | if ((saveint = signal(SIGINT, SIG_IGN)) == SIG_DFL) | |
89 | signal(SIGINT, SIG_DFL); | |
90 | if ((savequit = signal(SIGQUIT, SIG_IGN)) == SIG_DFL) | |
91 | signal(SIGQUIT, SIG_DFL); | |
92 | #else | |
93 | if (setjmp(intjmp)) | |
94 | goto out; | |
95 | saveint = signal(SIGINT, ttyint); | |
96 | #endif | |
97 | if (gflags & GTO) { | |
98 | #ifndef TIOCSTI | |
99 | if (!ttyset && hp->h_to != NIL) | |
100 | ttyset++, stty(fileno(stdin), &ttybuf); | |
101 | #endif | |
102 | hp->h_to = | |
103 | extract(readtty("To: ", detract(hp->h_to, 0)), GTO); | |
104 | } | |
105 | if (gflags & GSUBJECT) { | |
106 | #ifndef TIOCSTI | |
107 | if (!ttyset && hp->h_subject != NOSTR) | |
108 | ttyset++, stty(fileno(stdin), &ttybuf); | |
109 | #endif | |
110 | hp->h_subject = readtty("Subject: ", hp->h_subject); | |
111 | } | |
112 | if (gflags & GCC) { | |
113 | #ifndef TIOCSTI | |
114 | if (!ttyset && hp->h_cc != NIL) | |
115 | ttyset++, stty(fileno(stdin), &ttybuf); | |
116 | #endif | |
117 | hp->h_cc = | |
118 | extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC); | |
119 | } | |
120 | if (gflags & GBCC) { | |
121 | #ifndef TIOCSTI | |
122 | if (!ttyset && hp->h_bcc != NIL) | |
123 | ttyset++, stty(fileno(stdin), &ttybuf); | |
124 | #endif | |
125 | hp->h_bcc = | |
126 | extract(readtty("Bcc: ", detract(hp->h_bcc, 0)), GBCC); | |
127 | } | |
128 | out: | |
129 | signal(SIGTSTP, savetstp); | |
130 | signal(SIGTTOU, savettou); | |
131 | signal(SIGTTIN, savettin); | |
132 | #ifndef TIOCSTI | |
133 | ttybuf.sg_erase = c_erase; | |
134 | ttybuf.sg_kill = c_kill; | |
135 | if (ttyset) | |
136 | stty(fileno(stdin), &ttybuf); | |
137 | signal(SIGQUIT, savequit); | |
138 | #endif | |
139 | signal(SIGINT, saveint); | |
140 | return(errs); | |
141 | } | |
142 | ||
143 | /* | |
144 | * Read up a header from standard input. | |
145 | * The source string has the preliminary contents to | |
146 | * be read. | |
147 | * | |
148 | */ | |
149 | ||
150 | char * | |
151 | readtty(pr, src) | |
152 | char pr[], src[]; | |
153 | { | |
154 | char ch, canonb[BUFSIZ]; | |
155 | int c; | |
156 | register char *cp, *cp2; | |
157 | void ttystop(); | |
158 | ||
159 | fputs(pr, stdout); | |
160 | fflush(stdout); | |
161 | if (src != NOSTR && strlen(src) > BUFSIZ - 2) { | |
162 | printf("too long to edit\n"); | |
163 | return(src); | |
164 | } | |
165 | #ifndef TIOCSTI | |
166 | if (src != NOSTR) | |
167 | cp = copy(src, canonb); | |
168 | else | |
169 | cp = copy("", canonb); | |
170 | fputs(canonb, stdout); | |
171 | fflush(stdout); | |
172 | #else | |
173 | cp = src == NOSTR ? "" : src; | |
174 | while (c = *cp++) { | |
175 | if (c == c_erase || c == c_kill) { | |
176 | ch = '\\'; | |
177 | ioctl(0, TIOCSTI, &ch); | |
178 | } | |
179 | ch = c; | |
180 | ioctl(0, TIOCSTI, &ch); | |
181 | } | |
182 | cp = canonb; | |
183 | *cp = 0; | |
184 | #endif | |
185 | cp2 = cp; | |
186 | while (cp2 < canonb + BUFSIZ) | |
187 | *cp2++ = 0; | |
188 | cp2 = cp; | |
189 | if (setjmp(rewrite)) | |
190 | goto redo; | |
191 | signal(SIGTSTP, ttystop); | |
192 | signal(SIGTTOU, ttystop); | |
193 | signal(SIGTTIN, ttystop); | |
194 | clearerr(stdin); | |
195 | while (cp2 < canonb + BUFSIZ) { | |
196 | c = getc(stdin); | |
197 | if (c == EOF || c == '\n') | |
198 | break; | |
199 | *cp2++ = c; | |
200 | } | |
201 | *cp2 = 0; | |
202 | signal(SIGTSTP, SIG_DFL); | |
203 | signal(SIGTTOU, SIG_DFL); | |
204 | signal(SIGTTIN, SIG_DFL); | |
205 | if (c == EOF && ferror(stdin)) { | |
206 | redo: | |
207 | cp = strlen(canonb) > 0 ? canonb : NOSTR; | |
208 | clearerr(stdin); | |
209 | return(readtty(pr, cp)); | |
210 | } | |
211 | #ifndef TIOCSTI | |
212 | if (cp == NOSTR || *cp == '\0') | |
213 | return(src); | |
214 | cp2 = cp; | |
215 | if (!ttyset) | |
216 | return(strlen(canonb) > 0 ? savestr(canonb) : NOSTR); | |
217 | while (*cp != '\0') { | |
218 | c = *cp++; | |
219 | if (c == c_erase) { | |
220 | if (cp2 == canonb) | |
221 | continue; | |
222 | if (cp2[-1] == '\\') { | |
223 | cp2[-1] = c; | |
224 | continue; | |
225 | } | |
226 | cp2--; | |
227 | continue; | |
228 | } | |
229 | if (c == c_kill) { | |
230 | if (cp2 == canonb) | |
231 | continue; | |
232 | if (cp2[-1] == '\\') { | |
233 | cp2[-1] = c; | |
234 | continue; | |
235 | } | |
236 | cp2 = canonb; | |
237 | continue; | |
238 | } | |
239 | *cp2++ = c; | |
240 | } | |
241 | *cp2 = '\0'; | |
242 | #endif | |
243 | if (equal("", canonb)) | |
244 | return(NOSTR); | |
245 | return(savestr(canonb)); | |
246 | } | |
247 | ||
248 | /* | |
249 | * Receipt continuation. | |
250 | */ | |
251 | void | |
252 | ttystop(s) | |
253 | { | |
254 | sig_t old_action = signal(s, SIG_DFL); | |
255 | ||
256 | sigsetmask(sigblock(0) & ~sigmask(s)); | |
257 | kill(0, s); | |
258 | sigblock(sigmask(s)); | |
259 | signal(s, old_action); | |
260 | longjmp(rewrite, 1); | |
261 | } | |
262 | ||
263 | /*ARGSUSED*/ | |
264 | void | |
265 | ttyint(s) | |
266 | { | |
267 | longjmp(intjmp, 1); | |
268 | } |