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- /*
- * Copyright (c) 1980 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms are permitted
- * provided that the above copyright notice and this paragraph are
- * duplicated in all such forms and that any documentation,
- * advertising materials, and other materials related to such
- * distribution and use acknowledge that the software was developed
- * by the University of California, Berkeley. The name of the
- * University may not be used to endorse or promote products derived
- * from this software without specific prior written permission.
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
- * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- */
-
- #ifndef lint
- static char sccsid[] = "%W% (Berkeley) %G%";
- #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;
- int (*saveint)();
- #ifndef TIOCSTI
- int (*savequit)();
- #endif
- int (*savetstp)();
- int (*savettou)();
- int (*savettin)();
- int errs;
- int ttyint();
-
- savetstp = signal(SIGTSTP, SIG_DFL);
- savettou = signal(SIGTTOU, SIG_DFL);
- savettin = signal(SIGTTIN, SIG_DFL);
- 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;
- 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;
- int 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.
- */
- ttystop(s)
- {
- int (*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*/
- ttyint(s)
- {
-
- longjmp(intjmp, 1);
- }
-