BSD 4_3_Net_2 release

[unix-history] / usr / src / usr.bin / mail / tty.c

/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#ifndef lint
static char sccsid[] = "@(#)tty.c       5.12 (Berkeley) 4/1/91";
#endif /* not lint */

/*
* Mail -- a mail program
*
* Generally useful tty stuff.
*/

#include "rcv.h"

static  int     c_erase;                /* Current erase char */
static  int     c_kill;                 /* Current kill char */
static  jmp_buf rewrite;                /* Place to go when continued */
static  jmp_buf intjmp;                 /* Place to go when interrupted */
#ifndef TIOCSTI
static  int     ttyset;                 /* We must now do erase/kill */
#endif

/*
* Read all relevant header fields.
*/

grabh(hp, gflags)
       struct header *hp;
{
       struct sgttyb ttybuf;
       sig_t saveint;
#ifndef TIOCSTI
       sig_t savequit;
#endif
       sig_t savetstp;
       sig_t savettou;
       sig_t savettin;
       int errs;
       void ttyint();

       savetstp = signal(SIGTSTP, SIG_DFL);
       savettou = signal(SIGTTOU, SIG_DFL);
       savettin = signal(SIGTTIN, SIG_DFL);
       errs = 0;
#ifndef TIOCSTI
       ttyset = 0;
#endif
       if (ioctl(fileno(stdin), TIOCGETP, &ttybuf) < 0) {
               perror("gtty");
               return(-1);
       }
       c_erase = ttybuf.sg_erase;
       c_kill = ttybuf.sg_kill;
#ifndef TIOCSTI
       ttybuf.sg_erase = 0;
       ttybuf.sg_kill = 0;
       if ((saveint = signal(SIGINT, SIG_IGN)) == SIG_DFL)
               signal(SIGINT, SIG_DFL);
       if ((savequit = signal(SIGQUIT, SIG_IGN)) == SIG_DFL)
               signal(SIGQUIT, SIG_DFL);
#else
       if (setjmp(intjmp))
               goto out;
       saveint = signal(SIGINT, ttyint);
#endif
       if (gflags & GTO) {
#ifndef TIOCSTI
               if (!ttyset && hp->h_to != NIL)
                       ttyset++, stty(fileno(stdin), &ttybuf);
#endif
               hp->h_to =
                       extract(readtty("To: ", detract(hp->h_to, 0)), GTO);
       }
       if (gflags & GSUBJECT) {
#ifndef TIOCSTI
               if (!ttyset && hp->h_subject != NOSTR)
                       ttyset++, stty(fileno(stdin), &ttybuf);
#endif
               hp->h_subject = readtty("Subject: ", hp->h_subject);
       }
       if (gflags & GCC) {
#ifndef TIOCSTI
               if (!ttyset && hp->h_cc != NIL)
                       ttyset++, stty(fileno(stdin), &ttybuf);
#endif
               hp->h_cc =
                       extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC);
       }
       if (gflags & GBCC) {
#ifndef TIOCSTI
               if (!ttyset && hp->h_bcc != NIL)
                       ttyset++, stty(fileno(stdin), &ttybuf);
#endif
               hp->h_bcc =
                       extract(readtty("Bcc: ", detract(hp->h_bcc, 0)), GBCC);
       }
out:
       signal(SIGTSTP, savetstp);
       signal(SIGTTOU, savettou);
       signal(SIGTTIN, savettin);
#ifndef TIOCSTI
       ttybuf.sg_erase = c_erase;
       ttybuf.sg_kill = c_kill;
       if (ttyset)
               stty(fileno(stdin), &ttybuf);
       signal(SIGQUIT, savequit);
#endif
       signal(SIGINT, saveint);
       return(errs);
}

/*
* Read up a header from standard input.
* The source string has the preliminary contents to
* be read.
*
*/

char *
readtty(pr, src)
       char pr[], src[];
{
       char ch, canonb[BUFSIZ];
       int c;
       register char *cp, *cp2;
       void ttystop();

       fputs(pr, stdout);
       fflush(stdout);
       if (src != NOSTR && strlen(src) > BUFSIZ - 2) {
               printf("too long to edit\n");
               return(src);
       }
#ifndef TIOCSTI
       if (src != NOSTR)
               cp = copy(src, canonb);
       else
               cp = copy("", canonb);
       fputs(canonb, stdout);
       fflush(stdout);
#else
       cp = src == NOSTR ? "" : src;
       while (c = *cp++) {
               if (c == c_erase || c == c_kill) {
                       ch = '\\';
                       ioctl(0, TIOCSTI, &ch);
               }
               ch = c;
               ioctl(0, TIOCSTI, &ch);
       }
       cp = canonb;
       *cp = 0;
#endif
       cp2 = cp;
       while (cp2 < canonb + BUFSIZ)
               *cp2++ = 0;
       cp2 = cp;
       if (setjmp(rewrite))
               goto redo;
       signal(SIGTSTP, ttystop);
       signal(SIGTTOU, ttystop);
       signal(SIGTTIN, ttystop);
       clearerr(stdin);
       while (cp2 < canonb + BUFSIZ) {
               c = getc(stdin);
               if (c == EOF || c == '\n')
                       break;
               *cp2++ = c;
       }
       *cp2 = 0;
       signal(SIGTSTP, SIG_DFL);
       signal(SIGTTOU, SIG_DFL);
       signal(SIGTTIN, SIG_DFL);
       if (c == EOF && ferror(stdin)) {
redo:
               cp = strlen(canonb) > 0 ? canonb : NOSTR;
               clearerr(stdin);
               return(readtty(pr, cp));
       }
#ifndef TIOCSTI
       if (cp == NOSTR || *cp == '\0')
               return(src);
       cp2 = cp;
       if (!ttyset)
               return(strlen(canonb) > 0 ? savestr(canonb) : NOSTR);
       while (*cp != '\0') {
               c = *cp++;
               if (c == c_erase) {
                       if (cp2 == canonb)
                               continue;
                       if (cp2[-1] == '\\') {
                               cp2[-1] = c;
                               continue;
                       }
                       cp2--;
                       continue;
               }
               if (c == c_kill) {
                       if (cp2 == canonb)
                               continue;
                       if (cp2[-1] == '\\') {
                               cp2[-1] = c;
                               continue;
                       }
                       cp2 = canonb;
                       continue;
               }
               *cp2++ = c;
       }
       *cp2 = '\0';
#endif
       if (equal("", canonb))
               return(NOSTR);
       return(savestr(canonb));
}

/*
* Receipt continuation.
*/
void
ttystop(s)
{
       sig_t old_action = signal(s, SIG_DFL);

       sigsetmask(sigblock(0) & ~sigmask(s));
       kill(0, s);
       sigblock(sigmask(s));
       signal(s, old_action);
       longjmp(rewrite, 1);
}

/*ARGSUSED*/
void
ttyint(s)
{
       longjmp(intjmp, 1);
}