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

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
static char *sccsid = "@(#)tty.c	5.2 (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	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
	clearerr(stdin);
	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++;
	longjmp(rewrite, 1);
}
# endif VMUNIX

/*
 * Null routine to satisfy
 * silly system bug that denies us holding SIGCONT
 */
signull(s)
{}
Commit	Line	Data
761330fe DF	1	/*
	2	* Copyright (c) 1980 Regents of the University of California.
	3	* All rights reserved. The Berkeley software License Agreement
	4	* specifies the terms and conditions for redistribution.
	5	*/
	6
2ae9f53f	7	#ifndef lint
2fd8b883	8	static char *sccsid = "@(#)tty.c 5.2 (Berkeley) %G%";
761330fe	9	#endif not lint
80741a9f KS	10
	11	/*
	12	* Mail -- a mail program
	13	*
	14	* Generally useful tty stuff.
	15	*/
	16
	17	#include "rcv.h"
80741a9f	18
80741a9f KS	19	static int c_erase; /* Current erase char */
80741a9f KS	20	static int c_kill; /* Current kill char */
1b38f4e9 KS	21	static int hadcont; /* Saw continue signal */
1b38f4e9 KS	22	static jmp_buf rewrite; /* Place to go when continued */
80741a9f KS	23	#ifndef TIOCSTI
	24	static int ttyset; /* We must now do erase/kill */
	25	#endif
	26
	27	/*
	28	* Read all relevant header fields.
	29	*/
	30
	31	grabh(hp, gflags)
	32	struct header *hp;
	33	{
	34	struct sgttyb ttybuf;
1b38f4e9	35	int ttycont(), signull();
80741a9f KS	36	#ifndef TIOCSTI
	37	int (*savesigs[2])();
	38	#endif
1b38f4e9	39	int (*savecont)();
80741a9f KS	40	register int s;
	41	int errs;
	42
ea394d88	43	# ifdef VMUNIX
1b38f4e9	44	savecont = sigset(SIGCONT, signull);
ea394d88	45	# endif VMUNIX
80741a9f KS	46	errs = 0;
	47	#ifndef TIOCSTI
	48	ttyset = 0;
	49	#endif
	50	if (gtty(fileno(stdin), &ttybuf) < 0) {
	51	perror("gtty");
	52	return(-1);
	53	}
	54	c_erase = ttybuf.sg_erase;
	55	c_kill = ttybuf.sg_kill;
	56	#ifndef TIOCSTI
	57	ttybuf.sg_erase = 0;
	58	ttybuf.sg_kill = 0;
	59	for (s = SIGINT; s <= SIGQUIT; s++)
9d9394d3 KS	60	if ((savesigs[s-SIGINT] = sigset(s, SIG_IGN)) == SIG_DFL)
9d9394d3 KS	61	sigset(s, SIG_DFL);
80741a9f KS	62	#endif
	63	if (gflags & GTO) {
	64	#ifndef TIOCSTI
	65	if (!ttyset && hp->h_to != NOSTR)
	66	ttyset++, stty(fileno(stdin), &ttybuf);
	67	#endif
	68	hp->h_to = readtty("To: ", hp->h_to);
	69	if (hp->h_to != NOSTR)
	70	hp->h_seq++;
	71	}
	72	if (gflags & GSUBJECT) {
	73	#ifndef TIOCSTI
	74	if (!ttyset && hp->h_subject != NOSTR)
	75	ttyset++, stty(fileno(stdin), &ttybuf);
	76	#endif
	77	hp->h_subject = readtty("Subject: ", hp->h_subject);
	78	if (hp->h_subject != NOSTR)
	79	hp->h_seq++;
	80	}
	81	if (gflags & GCC) {
	82	#ifndef TIOCSTI
	83	if (!ttyset && hp->h_cc != NOSTR)
	84	ttyset++, stty(fileno(stdin), &ttybuf);
	85	#endif
	86	hp->h_cc = readtty("Cc: ", hp->h_cc);
	87	if (hp->h_cc != NOSTR)
	88	hp->h_seq++;
	89	}
	90	if (gflags & GBCC) {
	91	#ifndef TIOCSTI
	92	if (!ttyset && hp->h_bcc != NOSTR)
	93	ttyset++, stty(fileno(stdin), &ttybuf);
	94	#endif
	95	hp->h_bcc = readtty("Bcc: ", hp->h_bcc);
	96	if (hp->h_bcc != NOSTR)
	97	hp->h_seq++;
	98	}
ea394d88	99	# ifdef VMUNIX
1b38f4e9	100	sigset(SIGCONT, savecont);
ea394d88	101	# endif VMUNIX
80741a9f KS	102	#ifndef TIOCSTI
	103	ttybuf.sg_erase = c_erase;
	104	ttybuf.sg_kill = c_kill;
	105	if (ttyset)
	106	stty(fileno(stdin), &ttybuf);
	107	for (s = SIGINT; s <= SIGQUIT; s++)
9d9394d3	108	sigset(s, savesigs[s-SIGINT]);
80741a9f KS	109	#endif
	110	return(errs);
	111	}
	112
	113	/*
	114	* Read up a header from standard input.
	115	* The source string has the preliminary contents to
	116	* be read.
	117	*
	118	*/
	119
	120	char *
	121	readtty(pr, src)
	122	char pr[], src[];
	123	{
338c4a5d SL	124	char ch, canonb[BUFSIZ];
338c4a5d SL	125	int c, signull();
80741a9f KS	126	register char cp, cp2;
80741a9f KS	127
1b38f4e9 KS	128	fputs(pr, stdout);
1b38f4e9 KS	129	fflush(stdout);
80741a9f KS	130	if (src != NOSTR && strlen(src) > BUFSIZ - 2) {
	131	printf("too long to edit\n");
	132	return(src);
	133	}
	134	#ifndef TIOCSTI
	135	if (src != NOSTR)
	136	cp = copy(src, canonb);
	137	else
	138	cp = copy("", canonb);
	139	fputs(canonb, stdout);
	140	fflush(stdout);
	141	#else
1b38f4e9 KS	142	cp = src == NOSTR ? "" : src;
1b38f4e9 KS	143	while (c = *cp++) {
80741a9f KS	144	if (c == c_erase \|\| c == c_kill) {
	145	ch = '\\';
	146	ioctl(0, TIOCSTI, &ch);
	147	}
338c4a5d SL	148	ch = c;
338c4a5d SL	149	ioctl(0, TIOCSTI, &ch);
80741a9f KS	150	}
80741a9f KS	151	cp = canonb;
419b1e01	152	*cp = 0;
80741a9f	153	#endif
1b38f4e9 KS	154	cp2 = cp;
	155	while (cp2 < canonb + BUFSIZ)
	156	*cp2++ = 0;
	157	cp2 = cp;
	158	if (setjmp(rewrite))
	159	goto redo;
ea394d88	160	# ifdef VMUNIX
1b38f4e9	161	sigset(SIGCONT, ttycont);
ea394d88	162	# endif VMUNIX
7bfe8da7	163	clearerr(stdin);
1b38f4e9 KS	164	while (cp2 < canonb + BUFSIZ) {
	165	c = getc(stdin);
	166	if (c == EOF \|\| c == '\n')
	167	break;
	168	*cp2++ = c;
	169	}
	170	*cp2 = 0;
ea394d88	171	# ifdef VMUNIX
1b38f4e9	172	sigset(SIGCONT, signull);
ea394d88	173	# endif VMUNIX
1b38f4e9 KS	174	if (c == EOF && ferror(stdin) && hadcont) {
	175	redo:
	176	hadcont = 0;
	177	cp = strlen(canonb) > 0 ? canonb : NOSTR;
	178	clearerr(stdin);
	179	return(readtty(pr, cp));
	180	}
80741a9f	181	#ifndef TIOCSTI
ea394d88	182	if (cp == NOSTR \|\| *cp == '\0')
80741a9f	183	return(src);
ea394d88	184	cp2 = cp;
80741a9f KS	185	if (!ttyset)
	186	return(strlen(canonb) > 0 ? savestr(canonb) : NOSTR);
	187	while (*cp != '\0') {
	188	c = *cp++;
	189	if (c == c_erase) {
	190	if (cp2 == canonb)
	191	continue;
	192	if (cp2[-1] == '\\') {
	193	cp2[-1] = c;
	194	continue;
	195	}
	196	cp2--;
	197	continue;
	198	}
	199	if (c == c_kill) {
	200	if (cp2 == canonb)
	201	continue;
	202	if (cp2[-1] == '\\') {
	203	cp2[-1] = c;
	204	continue;
	205	}
	206	cp2 = canonb;
	207	continue;
	208	}
	209	*cp2++ = c;
	210	}
	211	*cp2 = '\0';
	212	#endif
	213	if (equal("", canonb))
	214	return(NOSTR);
	215	return(savestr(canonb));
	216	}
1b38f4e9	217
ea394d88	218	# ifdef VMUNIX
1b38f4e9 KS	219	/*
	220	* Receipt continuation.
	221	*/
	222	ttycont(s)
	223	{
	224
	225	hadcont++;
1b38f4e9 KS	226	longjmp(rewrite, 1);
1b38f4e9 KS	227	}
ea394d88	228	# endif VMUNIX
1b38f4e9 KS	229
	230	/*
	231	* Null routine to satisfy
	232	* silly system bug that denies us holding SIGCONT
	233	*/
	234	signull(s)
	235	{}