BSD 4_1c_2 release

[unix-history] / usr / src / ucb / Mail / tty.c

#

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

#include "rcv.h"

static char *SccsId = "@(#)tty.c        2.4 2/9/83";

static  int     c_erase;                /* Current erase char */
static  int     c_kill;                 /* Current kill char */
static  int     hadcont;                /* Saw continue signal */
static  jmp_buf rewrite;                /* Place to go when continued */
#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;
       int ttycont(), signull();
#ifndef TIOCSTI
       int (*savesigs[2])();
#endif
       int (*savecont)();
       register int s;
       int errs;

# ifdef VMUNIX
       savecont = sigset(SIGCONT, signull);
# endif VMUNIX
       errs = 0;
#ifndef TIOCSTI
       ttyset = 0;
#endif
       if (gtty(fileno(stdin), &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;
       for (s = SIGINT; s <= SIGQUIT; s++)
               if ((savesigs[s-SIGINT] = sigset(s, SIG_IGN)) == SIG_DFL)
                       sigset(s, SIG_DFL);
#endif
       if (gflags & GTO) {
#ifndef TIOCSTI
               if (!ttyset && hp->h_to != NOSTR)
                       ttyset++, stty(fileno(stdin), &ttybuf);
#endif
               hp->h_to = readtty("To: ", hp->h_to);
               if (hp->h_to != NOSTR)
                       hp->h_seq++;
       }
       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 (hp->h_subject != NOSTR)
                       hp->h_seq++;
       }
       if (gflags & GCC) {
#ifndef TIOCSTI
               if (!ttyset && hp->h_cc != NOSTR)
                       ttyset++, stty(fileno(stdin), &ttybuf);
#endif
               hp->h_cc = readtty("Cc: ", hp->h_cc);
               if (hp->h_cc != NOSTR)
                       hp->h_seq++;
       }
       if (gflags & GBCC) {
#ifndef TIOCSTI
               if (!ttyset && hp->h_bcc != NOSTR)
                       ttyset++, stty(fileno(stdin), &ttybuf);
#endif
               hp->h_bcc = readtty("Bcc: ", hp->h_bcc);
               if (hp->h_bcc != NOSTR)
                       hp->h_seq++;
       }
# ifdef VMUNIX
       sigset(SIGCONT, savecont);
# endif VMUNIX
#ifndef TIOCSTI
       ttybuf.sg_erase = c_erase;
       ttybuf.sg_kill = c_kill;
       if (ttyset)
               stty(fileno(stdin), &ttybuf);
       for (s = SIGINT; s <= SIGQUIT; s++)
               sigset(s, savesigs[s-SIGINT]);
#endif
       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, signull();
       register char *cp, *cp2;

       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;
# ifdef VMUNIX
       sigset(SIGCONT, ttycont);
# endif VMUNIX
       while (cp2 < canonb + BUFSIZ) {
               c = getc(stdin);
               if (c == EOF || c == '\n')
                       break;
               *cp2++ = c;
       }
       *cp2 = 0;
# ifdef VMUNIX
       sigset(SIGCONT, signull);
# endif VMUNIX
       if (c == EOF && ferror(stdin) && hadcont) {
redo:
               hadcont = 0;
               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));
}

# ifdef VMUNIX
/*
* Receipt continuation.
*/
ttycont(s)
{

       hadcont++;
       sigrelse(SIGCONT);
       longjmp(rewrite, 1);
}
# endif VMUNIX

/*
* Null routine to satisfy
* silly system bug that denies us holding SIGCONT
*/
signull(s)
{}