Annotation of src/usr.bin/mail/tty.c, Revision 1.9
1.9 ! millert 1: /* $OpenBSD: tty.c,v 1.8 1997/07/30 06:32:41 millert Exp $ */
1.3 millert 2: /* $NetBSD: tty.c,v 1.7 1997/07/09 05:25:46 mikel Exp $ */
1.2 deraadt 3:
1.1 deraadt 4: /*
5: * Copyright (c) 1980, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
1.2 deraadt 38: #if 0
1.3 millert 39: static char sccsid[] = "@(#)tty.c 8.2 (Berkeley) 4/20/95";
1.2 deraadt 40: #else
1.9 ! millert 41: static char rcsid[] = "$OpenBSD: tty.c,v 1.8 1997/07/30 06:32:41 millert Exp $";
1.2 deraadt 42: #endif
1.1 deraadt 43: #endif /* not lint */
44:
45: /*
46: * Mail -- a mail program
47: *
48: * Generally useful tty stuff.
49: */
50:
51: #include "rcv.h"
52: #include "extern.h"
1.2 deraadt 53: #include <sys/ioctl.h>
1.1 deraadt 54:
1.5 millert 55: static cc_t c_erase; /* Current erase char */
56: static cc_t c_kill; /* Current kill char */
57: static sigjmp_buf rewrite; /* Place to go when continued */
58: static sigjmp_buf intjmp; /* Place to go when interrupted */
1.1 deraadt 59: #ifndef TIOCSTI
1.5 millert 60: static int ttyset; /* We must now do erase/kill */
1.1 deraadt 61: #endif
62:
63: /*
64: * Read all relevant header fields.
65: */
66:
67: int
68: grabh(hp, gflags)
69: struct header *hp;
70: int gflags;
71: {
72: struct termios ttybuf;
73: sig_t saveint;
74: #ifndef TIOCSTI
75: sig_t savequit;
76: #endif
77: sig_t savetstp;
78: sig_t savettou;
79: sig_t savettin;
1.7 millert 80: int errs = 0;
1.2 deraadt 81: #ifdef __GNUC__
1.5 millert 82: /* Avoid siglongjmp clobbering */
1.4 millert 83: (void)&saveint;
1.7 millert 84: (void)&errs;
1.2 deraadt 85: #endif
1.1 deraadt 86:
87: savetstp = signal(SIGTSTP, SIG_DFL);
88: savettou = signal(SIGTTOU, SIG_DFL);
89: savettin = signal(SIGTTIN, SIG_DFL);
90: errs = 0;
91: #ifndef TIOCSTI
92: ttyset = 0;
93: #endif
94: if (tcgetattr(fileno(stdin), &ttybuf) < 0) {
1.3 millert 95: warn("tcgetattr");
1.1 deraadt 96: return(-1);
97: }
98: c_erase = ttybuf.c_cc[VERASE];
99: c_kill = ttybuf.c_cc[VKILL];
100: #ifndef TIOCSTI
101: ttybuf.c_cc[VERASE] = 0;
102: ttybuf.c_cc[VKILL] = 0;
103: if ((saveint = signal(SIGINT, SIG_IGN)) == SIG_DFL)
1.8 millert 104: (void)signal(SIGINT, SIG_DFL);
1.1 deraadt 105: if ((savequit = signal(SIGQUIT, SIG_IGN)) == SIG_DFL)
1.8 millert 106: (void)signal(SIGQUIT, SIG_DFL);
1.1 deraadt 107: #else
1.7 millert 108: if (sigsetjmp(intjmp, 1)) {
109: errs = SIGINT;
1.1 deraadt 110: goto out;
1.7 millert 111: }
1.1 deraadt 112: saveint = signal(SIGINT, ttyint);
113: #endif
114: if (gflags & GTO) {
115: #ifndef TIOCSTI
116: if (!ttyset && hp->h_to != NIL)
117: ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
118: #endif
119: hp->h_to =
120: extract(readtty("To: ", detract(hp->h_to, 0)), GTO);
121: }
122: if (gflags & GSUBJECT) {
123: #ifndef TIOCSTI
1.5 millert 124: if (!ttyset && hp->h_subject != NULL)
1.1 deraadt 125: ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
126: #endif
127: hp->h_subject = readtty("Subject: ", hp->h_subject);
128: }
129: if (gflags & GCC) {
130: #ifndef TIOCSTI
131: if (!ttyset && hp->h_cc != NIL)
132: ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
133: #endif
134: hp->h_cc =
135: extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC);
136: }
137: if (gflags & GBCC) {
138: #ifndef TIOCSTI
139: if (!ttyset && hp->h_bcc != NIL)
140: ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
141: #endif
142: hp->h_bcc =
143: extract(readtty("Bcc: ", detract(hp->h_bcc, 0)), GBCC);
144: }
145: out:
1.8 millert 146: (void)signal(SIGTSTP, savetstp);
147: (void)signal(SIGTTOU, savettou);
148: (void)signal(SIGTTIN, savettin);
1.1 deraadt 149: #ifndef TIOCSTI
150: ttybuf.c_cc[VERASE] = c_erase;
151: ttybuf.c_cc[VKILL] = c_kill;
152: if (ttyset)
153: tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
1.8 millert 154: (void)signal(SIGQUIT, savequit);
1.1 deraadt 155: #endif
1.8 millert 156: (void)signal(SIGINT, saveint);
1.1 deraadt 157: return(errs);
158: }
159:
160: /*
161: * Read up a header from standard input.
162: * The source string has the preliminary contents to
163: * be read.
164: *
165: */
166:
167: char *
168: readtty(pr, src)
169: char pr[], src[];
170: {
171: char ch, canonb[BUFSIZ];
172: int c;
1.2 deraadt 173: char *cp, *cp2;
174: #if __GNUC__
1.5 millert 175: /* Avoid siglongjmp clobbering */
1.4 millert 176: (void)&c;
177: (void)&cp2;
1.2 deraadt 178: #endif
1.1 deraadt 179:
180: fputs(pr, stdout);
181: fflush(stdout);
1.5 millert 182: if (src != NULL && strlen(src) > BUFSIZ - 2) {
1.3 millert 183: puts("too long to edit");
1.1 deraadt 184: return(src);
185: }
186: #ifndef TIOCSTI
1.5 millert 187: if (src != NULL)
1.1 deraadt 188: cp = copy(src, canonb);
189: else
190: cp = copy("", canonb);
191: fputs(canonb, stdout);
192: fflush(stdout);
193: #else
1.5 millert 194: cp = src == NULL ? "" : src;
1.2 deraadt 195: while ((c = *cp++) != '\0') {
1.1 deraadt 196: if ((c_erase != _POSIX_VDISABLE && c == c_erase) ||
197: (c_kill != _POSIX_VDISABLE && c == c_kill)) {
198: ch = '\\';
199: ioctl(0, TIOCSTI, &ch);
200: }
201: ch = c;
202: ioctl(0, TIOCSTI, &ch);
203: }
204: cp = canonb;
205: *cp = 0;
206: #endif
207: cp2 = cp;
208: while (cp2 < canonb + BUFSIZ)
209: *cp2++ = 0;
210: cp2 = cp;
1.5 millert 211: if (sigsetjmp(rewrite, 1))
1.1 deraadt 212: goto redo;
1.8 millert 213: (void)signal(SIGTSTP, ttystop);
214: (void)signal(SIGTTOU, ttystop);
215: (void)signal(SIGTTIN, ttystop);
1.1 deraadt 216: clearerr(stdin);
217: while (cp2 < canonb + BUFSIZ) {
218: c = getc(stdin);
219: if (c == EOF || c == '\n')
220: break;
221: *cp2++ = c;
222: }
223: *cp2 = 0;
1.8 millert 224: (void)signal(SIGTSTP, SIG_DFL);
225: (void)signal(SIGTTOU, SIG_DFL);
226: (void)signal(SIGTTIN, SIG_DFL);
1.1 deraadt 227: if (c == EOF && ferror(stdin)) {
228: redo:
1.5 millert 229: cp = strlen(canonb) > 0 ? canonb : NULL;
1.1 deraadt 230: clearerr(stdin);
231: return(readtty(pr, cp));
232: }
233: #ifndef TIOCSTI
1.5 millert 234: if (cp == NULL || *cp == '\0')
1.1 deraadt 235: return(src);
236: cp2 = cp;
237: if (!ttyset)
1.5 millert 238: return(strlen(canonb) > 0 ? savestr(canonb) : NULL);
1.1 deraadt 239: while (*cp != '\0') {
240: c = *cp++;
241: if (c_erase != _POSIX_VDISABLE && c == c_erase) {
242: if (cp2 == canonb)
243: continue;
244: if (cp2[-1] == '\\') {
245: cp2[-1] = c;
246: continue;
247: }
248: cp2--;
249: continue;
250: }
251: if (c_kill != _POSIX_VDISABLE && c == c_kill) {
252: if (cp2 == canonb)
253: continue;
254: if (cp2[-1] == '\\') {
255: cp2[-1] = c;
256: continue;
257: }
258: cp2 = canonb;
259: continue;
260: }
261: *cp2++ = c;
262: }
263: *cp2 = '\0';
264: #endif
265: if (equal("", canonb))
1.5 millert 266: return(NULL);
1.1 deraadt 267: return(savestr(canonb));
268: }
269:
270: /*
271: * Receipt continuation.
272: */
273: void
274: ttystop(s)
275: int s;
276: {
277: sig_t old_action = signal(s, SIG_DFL);
1.2 deraadt 278: sigset_t nset;
1.1 deraadt 279:
1.8 millert 280: (void)sigemptyset(&nset);
281: (void)sigaddset(&nset, s);
282: (void)sigprocmask(SIG_UNBLOCK, &nset, NULL);
283: (void)kill(0, s);
284: (void)sigprocmask(SIG_BLOCK, &nset, NULL);
285: (void)signal(s, old_action);
1.5 millert 286: siglongjmp(rewrite, 1);
1.1 deraadt 287: }
288:
289: /*ARGSUSED*/
290: void
291: ttyint(s)
292: int s;
293: {
1.5 millert 294: siglongjmp(intjmp, 1);
1.1 deraadt 295: }
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