usr/src/usr.bin/mail/tty.c

#ifndef lint
static char sccsid[] = "@(#)tty.c	2.7 (Berkeley) %G%";
#endif

/*
 * 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
	1	#ifndef lint
	2	static char sccsid[] = "@(#)tty.c 2.7 (Berkeley) %G%";
	3	#endif
	4
	5	/*
	6	* Mail -- a mail program
	7	*
	8	* Generally useful tty stuff.
	9	*/
	10
	11	#include "rcv.h"
	12
	13	static int c_erase; /* Current erase char */
	14	static int c_kill; /* Current kill char */
	15	static int hadcont; /* Saw continue signal */
	16	static jmp_buf rewrite; /* Place to go when continued */
	17	#ifndef TIOCSTI
	18	static int ttyset; /* We must now do erase/kill */
	19	#endif
	20
	21	/*
	22	* Read all relevant header fields.
	23	*/
	24
	25	grabh(hp, gflags)
	26	struct header *hp;
	27	{
	28	struct sgttyb ttybuf;
	29	int ttycont(), signull();
	30	#ifndef TIOCSTI
	31	int (*savesigs[2])();
	32	#endif
	33	int (*savecont)();
	34	register int s;
	35	int errs;
	36
	37	# ifdef VMUNIX
	38	savecont = sigset(SIGCONT, signull);
	39	# endif VMUNIX
	40	errs = 0;
	41	#ifndef TIOCSTI
	42	ttyset = 0;
	43	#endif
	44	if (gtty(fileno(stdin), &ttybuf) < 0) {
	45	perror("gtty");
	46	return(-1);
	47	}
	48	c_erase = ttybuf.sg_erase;
	49	c_kill = ttybuf.sg_kill;
	50	#ifndef TIOCSTI
	51	ttybuf.sg_erase = 0;
	52	ttybuf.sg_kill = 0;
	53	for (s = SIGINT; s <= SIGQUIT; s++)
	54	if ((savesigs[s-SIGINT] = sigset(s, SIG_IGN)) == SIG_DFL)
	55	sigset(s, SIG_DFL);
	56	#endif
	57	if (gflags & GTO) {
	58	#ifndef TIOCSTI
	59	if (!ttyset && hp->h_to != NOSTR)
	60	ttyset++, stty(fileno(stdin), &ttybuf);
	61	#endif
	62	hp->h_to = readtty("To: ", hp->h_to);
	63	if (hp->h_to != NOSTR)
	64	hp->h_seq++;
	65	}
	66	if (gflags & GSUBJECT) {
	67	#ifndef TIOCSTI
	68	if (!ttyset && hp->h_subject != NOSTR)
	69	ttyset++, stty(fileno(stdin), &ttybuf);
	70	#endif
	71	hp->h_subject = readtty("Subject: ", hp->h_subject);
	72	if (hp->h_subject != NOSTR)
	73	hp->h_seq++;
	74	}
	75	if (gflags & GCC) {
	76	#ifndef TIOCSTI
	77	if (!ttyset && hp->h_cc != NOSTR)
	78	ttyset++, stty(fileno(stdin), &ttybuf);
	79	#endif
	80	hp->h_cc = readtty("Cc: ", hp->h_cc);
	81	if (hp->h_cc != NOSTR)
	82	hp->h_seq++;
	83	}
	84	if (gflags & GBCC) {
	85	#ifndef TIOCSTI
	86	if (!ttyset && hp->h_bcc != NOSTR)
	87	ttyset++, stty(fileno(stdin), &ttybuf);
	88	#endif
	89	hp->h_bcc = readtty("Bcc: ", hp->h_bcc);
	90	if (hp->h_bcc != NOSTR)
	91	hp->h_seq++;
	92	}
	93	# ifdef VMUNIX
	94	sigset(SIGCONT, savecont);
	95	# endif VMUNIX
	96	#ifndef TIOCSTI
	97	ttybuf.sg_erase = c_erase;
	98	ttybuf.sg_kill = c_kill;
	99	if (ttyset)
	100	stty(fileno(stdin), &ttybuf);
	101	for (s = SIGINT; s <= SIGQUIT; s++)
	102	sigset(s, savesigs[s-SIGINT]);
	103	#endif
	104	return(errs);
	105	}
	106
	107	/*
	108	* Read up a header from standard input.
	109	* The source string has the preliminary contents to
	110	* be read.
	111	*
	112	*/
	113
	114	char *
	115	readtty(pr, src)
	116	char pr[], src[];
	117	{
	118	char ch, canonb[BUFSIZ];
	119	int c, signull();
	120	register char cp, cp2;
	121
	122	fputs(pr, stdout);
	123	fflush(stdout);
	124	if (src != NOSTR && strlen(src) > BUFSIZ - 2) {
	125	printf("too long to edit\n");
	126	return(src);
	127	}
	128	#ifndef TIOCSTI
	129	if (src != NOSTR)
	130	cp = copy(src, canonb);
	131	else
	132	cp = copy("", canonb);
	133	fputs(canonb, stdout);
	134	fflush(stdout);
	135	#else
	136	cp = src == NOSTR ? "" : src;
	137	while (c = *cp++) {
	138	if (c == c_erase \|\| c == c_kill) {
	139	ch = '\\';
	140	ioctl(0, TIOCSTI, &ch);
	141	}
	142	ch = c;
	143	ioctl(0, TIOCSTI, &ch);
	144	}
	145	cp = canonb;
	146	*cp = 0;
	147	#endif
	148	cp2 = cp;
	149	while (cp2 < canonb + BUFSIZ)
	150	*cp2++ = 0;
	151	cp2 = cp;
	152	if (setjmp(rewrite))
	153	goto redo;
	154	# ifdef VMUNIX
	155	sigset(SIGCONT, ttycont);
	156	# endif VMUNIX
	157	clearerr(stdin);
	158	while (cp2 < canonb + BUFSIZ) {
	159	c = getc(stdin);
	160	if (c == EOF \|\| c == '\n')
	161	break;
	162	*cp2++ = c;
	163	}
	164	*cp2 = 0;
	165	# ifdef VMUNIX
	166	sigset(SIGCONT, signull);
	167	# endif VMUNIX
	168	if (c == EOF && ferror(stdin) && hadcont) {
	169	redo:
	170	hadcont = 0;
	171	cp = strlen(canonb) > 0 ? canonb : NOSTR;
	172	clearerr(stdin);
	173	return(readtty(pr, cp));
	174	}
	175	#ifndef TIOCSTI
	176	if (cp == NOSTR \|\| *cp == '\0')
	177	return(src);
	178	cp2 = cp;
	179	if (!ttyset)
	180	return(strlen(canonb) > 0 ? savestr(canonb) : NOSTR);
	181	while (*cp != '\0') {
	182	c = *cp++;
	183	if (c == c_erase) {
	184	if (cp2 == canonb)
	185	continue;
	186	if (cp2[-1] == '\\') {
	187	cp2[-1] = c;
	188	continue;
	189	}
	190	cp2--;
	191	continue;
	192	}
	193	if (c == c_kill) {
	194	if (cp2 == canonb)
	195	continue;
	196	if (cp2[-1] == '\\') {
	197	cp2[-1] = c;
	198	continue;
	199	}
	200	cp2 = canonb;
	201	continue;
	202	}
	203	*cp2++ = c;
	204	}
	205	*cp2 = '\0';
	206	#endif
	207	if (equal("", canonb))
	208	return(NOSTR);
	209	return(savestr(canonb));
	210	}
	211
	212	# ifdef VMUNIX
	213	/*
	214	* Receipt continuation.
	215	*/
	216	ttycont(s)
	217	{
	218
	219	hadcont++;
	220	longjmp(rewrite, 1);
	221	}
	222	# endif VMUNIX
	223
	224	/*
	225	* Null routine to satisfy
	226	* silly system bug that denies us holding SIGCONT
	227	*/
	228	signull(s)
	229	{}