usr.bin/mail/tty.c

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