usr/src/usr.bin/tip/remcap.c

/*
 * Copyright (c) 1983 The 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[] = "@(#)remcap.c	5.2 (Berkeley) %G%";
#endif /* not lint */

/*
 * remcap - routines for dealing with the remote host data base
 *
 * derived from termcap
 */
#include <sys/file.h>
#include <ctype.h>

#ifndef BUFSIZ
#define	BUFSIZ		1024
#endif
#define MAXHOP		32		/* max number of tc= indirections */
#define SYSREMOTE	"/etc/remote"	/* system remote file */

#define	tgetent		rgetent
#define	tnchktc		rnchktc
#define	tnamatch	rnamatch
#define	tgetnum		rgetnum
#define	tgetflag	rgetflag
#define	tgetstr		rgetstr
#define	E_TERMCAP	RM = SYSREMOTE
#define V_TERMCAP	"REMOTE"
#define V_TERM		"HOST"

char	*RM;

/*
 * termcap - routines for dealing with the terminal capability data base
 *
 * BUG:		Should use a "last" pointer in tbuf, so that searching
 *		for capabilities alphabetically would not be a n**2/2
 *		process when large numbers of capabilities are given.
 * Note:	If we add a last pointer now we will screw up the
 *		tc capability. We really should compile termcap.
 *
 * Essentially all the work here is scanning and decoding escapes
 * in string capabilities.  We don't use stdio because the editor
 * doesn't, and because living w/o it is not hard.
 */

static	char *tbuf;
static	int hopcount;	/* detect infinite loops in termcap, init 0 */
char	*tskip();
char	*tgetstr();
char	*tdecode();
char	*getenv();
static	char *remotefile;

/*
 * Get an entry for terminal name in buffer bp,
 * from the termcap file.  Parse is very rudimentary;
 * we just notice escaped newlines.
 */
tgetent(bp, name)
	char *bp, *name;
{
	char lbuf[BUFSIZ], *cp, *p;
	int rc1, rc2;

	remotefile = cp = getenv(V_TERMCAP);
	if (cp == (char *)0 || strcmp(cp, SYSREMOTE) == 0) {
		remotefile = cp = SYSREMOTE;
		return (getent(bp, name, cp));
	} else {
		if ((rc1 = getent(bp, name, cp)) != 1)
			*bp = '\0';
		remotefile = cp = SYSREMOTE;
		rc2 = getent(lbuf, name, cp);
		if (rc1 != 1 && rc2 != 1)
			return (rc2);
		if (rc2 == 1) {
			p = lbuf;
			if (rc1 == 1)
				while (*p++ != ':')
					;
			if (strlen(bp) + strlen(p) > BUFSIZ) {
				write(2, "Remcap entry too long\n", 23);
				return (-1);
			}
			strcat(bp, p);
		}
		tbuf = bp;
		return (1);
	}
}

getent(bp, name, cp)
	char *bp, *name, *cp;
{
	register int c;
	register int i = 0, cnt = 0;
	char ibuf[BUFSIZ], *cp2;
	int tf;

	tbuf = bp;
	tf = 0;
	/*
	 * TERMCAP can have one of two things in it. It can be the
	 * name of a file to use instead of /etc/termcap. In this
	 * case it better start with a "/". Or it can be an entry to
	 * use so we don't have to read the file. In this case it
	 * has to already have the newlines crunched out.
	 */
	if (cp && *cp) {
		if (*cp!='/') {
			cp2 = getenv(V_TERM);
			if (cp2 == (char *)0 || strcmp(name,cp2) == 0) {
				strcpy(bp,cp);
				return (tnchktc());
			} else
				tf = open(E_TERMCAP, O_RDONLY);
		} else
			tf = open(RM = cp, O_RDONLY);
	}
	if (tf == 0)
		tf = open(E_TERMCAP, O_RDONLY);
	if (tf < 0)
		return (-1);
	for (;;) {
		cp = bp;
		for (;;) {
			if (i == cnt) {
				cnt = read(tf, ibuf, BUFSIZ);
				if (cnt <= 0) {
					close(tf);
					return (0);
				}
				i = 0;
			}
			c = ibuf[i++];
			if (c == '\n') {
				if (cp > bp && cp[-1] == '\\') {
					cp--;
					continue;
				}
				break;
			}
			if (cp >= bp+BUFSIZ) {
				write(2,"Remcap entry too long\n", 23);
				break;
			} else
				*cp++ = c;
		}
		*cp = 0;

		/*
		 * The real work for the match.
		 */
		if (tnamatch(name)) {
			close(tf);
			return (tnchktc());
		}
	}
}

/*
 * tnchktc: check the last entry, see if it's tc=xxx. If so,
 * recursively find xxx and append that entry (minus the names)
 * to take the place of the tc=xxx entry. This allows termcap
 * entries to say "like an HP2621 but doesn't turn on the labels".
 * Note that this works because of the left to right scan.
 */
tnchktc()
{
	register char *p, *q;
	char tcname[16];	/* name of similar terminal */
	char tcbuf[BUFSIZ];
	char *holdtbuf = tbuf;
	int l;
	char *cp;

	p = tbuf + strlen(tbuf) - 2;	/* before the last colon */
	while (*--p != ':')
		if (p<tbuf) {
			write(2, "Bad remcap entry\n", 18);
			return (0);
		}
	p++;
	/* p now points to beginning of last field */
	if (p[0] != 't' || p[1] != 'c')
		return (1);
	strcpy(tcname, p+3);
	q = tcname;
	while (*q && *q != ':')
		q++;
	*q = 0;
	if (++hopcount > MAXHOP) {
		write(2, "Infinite tc= loop\n", 18);
		return (0);
	}
	if (getent(tcbuf, tcname, remotefile) != 1) {
		if (strcmp(remotefile, SYSREMOTE) == 0)
			return (0);
		else if (getent(tcbuf, tcname, SYSREMOTE) != 1)
			return (0);
	}
	for (q = tcbuf; *q++ != ':'; )
		;
	l = p - holdtbuf + strlen(q);
	if (l > BUFSIZ) {
		write(2, "Remcap entry too long\n", 23);
		q[BUFSIZ - (p-holdtbuf)] = 0;
	}
	strcpy(p, q);
	tbuf = holdtbuf;
	return (1);
}

/*
 * Tnamatch deals with name matching.  The first field of the termcap
 * entry is a sequence of names separated by |'s, so we compare
 * against each such name.  The normal : terminator after the last
 * name (before the first field) stops us.
 */
tnamatch(np)
	char *np;
{
	register char *Np, *Bp;

	Bp = tbuf;
	if (*Bp == '#')
		return (0);
	for (;;) {
		for (Np = np; *Np && *Bp == *Np; Bp++, Np++)
			continue;
		if (*Np == 0 && (*Bp == '|' || *Bp == ':' || *Bp == 0))
			return (1);
		while (*Bp && *Bp != ':' && *Bp != '|')
			Bp++;
		if (*Bp == 0 || *Bp == ':')
			return (0);
		Bp++;
	}
}

/*
 * Skip to the next field.  Notice that this is very dumb, not
 * knowing about \: escapes or any such.  If necessary, :'s can be put
 * into the termcap file in octal.
 */
static char *
tskip(bp)
	register char *bp;
{

	while (*bp && *bp != ':')
		bp++;
	if (*bp == ':')
		bp++;
	return (bp);
}

/*
 * Return the (numeric) option id.
 * Numeric options look like
 *	li#80
 * i.e. the option string is separated from the numeric value by
 * a # character.  If the option is not found we return -1.
 * Note that we handle octal numbers beginning with 0.
 */
tgetnum(id)
	char *id;
{
	register int i, base;
	register char *bp = tbuf;

	for (;;) {
		bp = tskip(bp);
		if (*bp == 0)
			return (-1);
		if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1])
			continue;
		if (*bp == '@')
			return (-1);
		if (*bp != '#')
			continue;
		bp++;
		base = 10;
		if (*bp == '0')
			base = 8;
		i = 0;
		while (isdigit(*bp))
			i *= base, i += *bp++ - '0';
		return (i);
	}
}

/*
 * Handle a flag option.
 * Flag options are given "naked", i.e. followed by a : or the end
 * of the buffer.  Return 1 if we find the option, or 0 if it is
 * not given.
 */
tgetflag(id)
	char *id;
{
	register char *bp = tbuf;

	for (;;) {
		bp = tskip(bp);
		if (!*bp)
			return (0);
		if (*bp++ == id[0] && *bp != 0 && *bp++ == id[1]) {
			if (!*bp || *bp == ':')
				return (1);
			else if (*bp == '@')
				return (0);
		}
	}
}

/*
 * Get a string valued option.
 * These are given as
 *	cl=^Z
 * Much decoding is done on the strings, and the strings are
 * placed in area, which is a ref parameter which is updated.
 * No checking on area overflow.
 */
char *
tgetstr(id, area)
	char *id, **area;
{
	register char *bp = tbuf;

	for (;;) {
		bp = tskip(bp);
		if (!*bp)
			return (0);
		if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1])
			continue;
		if (*bp == '@')
			return (0);
		if (*bp != '=')
			continue;
		bp++;
		return (tdecode(bp, area));
	}
}

/*
 * Tdecode does the grung work to decode the
 * string capability escapes.
 */
static char *
tdecode(str, area)
	register char *str;
	char **area;
{
	register char *cp;
	register int c;
	register char *dp;
	int i;

	cp = *area;
	while ((c = *str++) && c != ':') {
		switch (c) {

		case '^':
			c = *str++ & 037;
			break;

		case '\\':
			dp = "E\033^^\\\\::n\nr\rt\tb\bf\f";
			c = *str++;
nextc:
			if (*dp++ == c) {
				c = *dp++;
				break;
			}
			dp++;
			if (*dp)
				goto nextc;
			if (isdigit(c)) {
				c -= '0', i = 2;
				do
					c <<= 3, c |= *str++ - '0';
				while (--i && isdigit(*str));
			}
			break;
		}
		*cp++ = c;
	}
	*cp++ = 0;
	str = *area;
	*area = cp;
	return (str);
}
Commit	Line	Data
	1	/*
	2	* Copyright (c) 1983 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms are permitted
	6	* provided that the above copyright notice and this paragraph are
	7	* duplicated in all such forms and that any documentation,
	8	* advertising materials, and other materials related to such
	9	* distribution and use acknowledge that the software was developed
	10	* by the University of California, Berkeley. The name of the
	11	* University may not be used to endorse or promote products derived
	12	* from this software without specific prior written permission.
	13	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
	14	* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
	15	* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
	16	*/
	17
	18	#ifndef lint
	19	static char sccsid[] = "@(#)remcap.c 5.2 (Berkeley) %G%";
	20	#endif /* not lint */
	21
	22	/*
	23	* remcap - routines for dealing with the remote host data base
	24	*
	25	* derived from termcap
	26	*/
	27	#include <sys/file.h>
	28	#include <ctype.h>
	29
	30	#ifndef BUFSIZ
	31	#define BUFSIZ 1024
	32	#endif
	33	#define MAXHOP 32 /* max number of tc= indirections */
	34	#define SYSREMOTE "/etc/remote" /* system remote file */
	35
	36	#define tgetent rgetent
	37	#define tnchktc rnchktc
	38	#define tnamatch rnamatch
	39	#define tgetnum rgetnum
	40	#define tgetflag rgetflag
	41	#define tgetstr rgetstr
	42	#define E_TERMCAP RM = SYSREMOTE
	43	#define V_TERMCAP "REMOTE"
	44	#define V_TERM "HOST"
	45
	46	char *RM;
	47
	48	/*
	49	* termcap - routines for dealing with the terminal capability data base
	50	*
	51	* BUG: Should use a "last" pointer in tbuf, so that searching
	52	* for capabilities alphabetically would not be a n**2/2
	53	* process when large numbers of capabilities are given.
	54	* Note: If we add a last pointer now we will screw up the
	55	* tc capability. We really should compile termcap.
	56	*
	57	* Essentially all the work here is scanning and decoding escapes
	58	* in string capabilities. We don't use stdio because the editor
	59	* doesn't, and because living w/o it is not hard.
	60	*/
	61
	62	static char *tbuf;
	63	static int hopcount; /* detect infinite loops in termcap, init 0 */
	64	char *tskip();
	65	char *tgetstr();
	66	char *tdecode();
	67	char *getenv();
	68	static char *remotefile;
	69
	70	/*
	71	* Get an entry for terminal name in buffer bp,
	72	* from the termcap file. Parse is very rudimentary;
	73	* we just notice escaped newlines.
	74	*/
	75	tgetent(bp, name)
	76	char bp, name;
	77	{
	78	char lbuf[BUFSIZ], cp, p;
	79	int rc1, rc2;
	80
	81	remotefile = cp = getenv(V_TERMCAP);
	82	if (cp == (char *)0 \|\| strcmp(cp, SYSREMOTE) == 0) {
	83	remotefile = cp = SYSREMOTE;
	84	return (getent(bp, name, cp));
	85	} else {
	86	if ((rc1 = getent(bp, name, cp)) != 1)
	87	*bp = '\0';
	88	remotefile = cp = SYSREMOTE;
	89	rc2 = getent(lbuf, name, cp);
	90	if (rc1 != 1 && rc2 != 1)
	91	return (rc2);
	92	if (rc2 == 1) {
	93	p = lbuf;
	94	if (rc1 == 1)
	95	while (*p++ != ':')
	96	;
	97	if (strlen(bp) + strlen(p) > BUFSIZ) {
	98	write(2, "Remcap entry too long\n", 23);
	99	return (-1);
	100	}
	101	strcat(bp, p);
	102	}
	103	tbuf = bp;
	104	return (1);
	105	}
	106	}
	107
	108	getent(bp, name, cp)
	109	char bp, name, *cp;
	110	{
	111	register int c;
	112	register int i = 0, cnt = 0;
	113	char ibuf[BUFSIZ], *cp2;
	114	int tf;
	115
	116	tbuf = bp;
	117	tf = 0;
	118	/*
	119	* TERMCAP can have one of two things in it. It can be the
	120	* name of a file to use instead of /etc/termcap. In this
	121	* case it better start with a "/". Or it can be an entry to
	122	* use so we don't have to read the file. In this case it
	123	* has to already have the newlines crunched out.
	124	*/
	125	if (cp && *cp) {
	126	if (*cp!='/') {
	127	cp2 = getenv(V_TERM);
	128	if (cp2 == (char *)0 \|\| strcmp(name,cp2) == 0) {
	129	strcpy(bp,cp);
	130	return (tnchktc());
	131	} else
	132	tf = open(E_TERMCAP, O_RDONLY);
	133	} else
	134	tf = open(RM = cp, O_RDONLY);
	135	}
	136	if (tf == 0)
	137	tf = open(E_TERMCAP, O_RDONLY);
	138	if (tf < 0)
	139	return (-1);
	140	for (;;) {
	141	cp = bp;
	142	for (;;) {
	143	if (i == cnt) {
	144	cnt = read(tf, ibuf, BUFSIZ);
	145	if (cnt <= 0) {
	146	close(tf);
	147	return (0);
	148	}
	149	i = 0;
	150	}
	151	c = ibuf[i++];
	152	if (c == '\n') {
	153	if (cp > bp && cp[-1] == '\\') {
	154	cp--;
	155	continue;
	156	}
	157	break;
	158	}
	159	if (cp >= bp+BUFSIZ) {
	160	write(2,"Remcap entry too long\n", 23);
	161	break;
	162	} else
	163	*cp++ = c;
	164	}
	165	*cp = 0;
	166
	167	/*
	168	* The real work for the match.
	169	*/
	170	if (tnamatch(name)) {
	171	close(tf);
	172	return (tnchktc());
	173	}
	174	}
	175	}
	176
	177	/*
	178	* tnchktc: check the last entry, see if it's tc=xxx. If so,
	179	* recursively find xxx and append that entry (minus the names)
	180	* to take the place of the tc=xxx entry. This allows termcap
	181	* entries to say "like an HP2621 but doesn't turn on the labels".
	182	* Note that this works because of the left to right scan.
	183	*/
	184	tnchktc()
	185	{
	186	register char p, q;
	187	char tcname[16]; /* name of similar terminal */
	188	char tcbuf[BUFSIZ];
	189	char *holdtbuf = tbuf;
	190	int l;
	191	char *cp;
	192
	193	p = tbuf + strlen(tbuf) - 2; /* before the last colon */
	194	while (*--p != ':')
	195	if (p<tbuf) {
	196	write(2, "Bad remcap entry\n", 18);
	197	return (0);
	198	}
	199	p++;
	200	/* p now points to beginning of last field */
	201	if (p[0] != 't' \|\| p[1] != 'c')
	202	return (1);
	203	strcpy(tcname, p+3);
	204	q = tcname;
	205	while (q && q != ':')
	206	q++;
	207	*q = 0;
	208	if (++hopcount > MAXHOP) {
	209	write(2, "Infinite tc= loop\n", 18);
	210	return (0);
	211	}
	212	if (getent(tcbuf, tcname, remotefile) != 1) {
	213	if (strcmp(remotefile, SYSREMOTE) == 0)
	214	return (0);
	215	else if (getent(tcbuf, tcname, SYSREMOTE) != 1)
	216	return (0);
	217	}
	218	for (q = tcbuf; *q++ != ':'; )
	219	;
	220	l = p - holdtbuf + strlen(q);
	221	if (l > BUFSIZ) {
	222	write(2, "Remcap entry too long\n", 23);
	223	q[BUFSIZ - (p-holdtbuf)] = 0;
	224	}
	225	strcpy(p, q);
	226	tbuf = holdtbuf;
	227	return (1);
	228	}
	229
	230	/*
	231	* Tnamatch deals with name matching. The first field of the termcap
	232	* entry is a sequence of names separated by \|'s, so we compare
	233	* against each such name. The normal : terminator after the last
	234	* name (before the first field) stops us.
	235	*/
	236	tnamatch(np)
	237	char *np;
	238	{
	239	register char Np, Bp;
	240
	241	Bp = tbuf;
	242	if (*Bp == '#')
	243	return (0);
	244	for (;;) {
	245	for (Np = np; Np && Bp == *Np; Bp++, Np++)
	246	continue;
	247	if (Np == 0 && (Bp == '\|' \|\| Bp == ':' \|\| Bp == 0))
	248	return (1);
	249	while (Bp && Bp != ':' && *Bp != '\|')
	250	Bp++;
	251	if (Bp == 0 \|\| Bp == ':')
	252	return (0);
	253	Bp++;
	254	}
	255	}
	256
	257	/*
	258	* Skip to the next field. Notice that this is very dumb, not
	259	* knowing about \: escapes or any such. If necessary, :'s can be put
	260	* into the termcap file in octal.
	261	*/
	262	static char *
	263	tskip(bp)
	264	register char *bp;
	265	{
	266
	267	while (bp && bp != ':')
	268	bp++;
	269	if (*bp == ':')
	270	bp++;
	271	return (bp);
	272	}
	273
	274	/*
	275	* Return the (numeric) option id.
	276	* Numeric options look like
	277	* li#80
	278	* i.e. the option string is separated from the numeric value by
	279	* a # character. If the option is not found we return -1.
	280	* Note that we handle octal numbers beginning with 0.
	281	*/
	282	tgetnum(id)
	283	char *id;
	284	{
	285	register int i, base;
	286	register char *bp = tbuf;
	287
	288	for (;;) {
	289	bp = tskip(bp);
	290	if (*bp == 0)
	291	return (-1);
	292	if (bp++ != id[0] \|\| bp == 0 \|\| *bp++ != id[1])
	293	continue;
	294	if (*bp == '@')
	295	return (-1);
	296	if (*bp != '#')
	297	continue;
	298	bp++;
	299	base = 10;
	300	if (*bp == '0')
	301	base = 8;
	302	i = 0;
	303	while (isdigit(*bp))
	304	i = base, i += bp++ - '0';
	305	return (i);
	306	}
	307	}
	308
	309	/*
	310	* Handle a flag option.
	311	* Flag options are given "naked", i.e. followed by a : or the end
	312	* of the buffer. Return 1 if we find the option, or 0 if it is
	313	* not given.
	314	*/
	315	tgetflag(id)
	316	char *id;
	317	{
	318	register char *bp = tbuf;
	319
	320	for (;;) {
	321	bp = tskip(bp);
	322	if (!*bp)
	323	return (0);
	324	if (bp++ == id[0] && bp != 0 && *bp++ == id[1]) {
	325	if (!bp \|\| bp == ':')
	326	return (1);
	327	else if (*bp == '@')
	328	return (0);
	329	}
	330	}
	331	}
	332
	333	/*
	334	* Get a string valued option.
	335	* These are given as
	336	* cl=^Z
	337	* Much decoding is done on the strings, and the strings are
	338	* placed in area, which is a ref parameter which is updated.
	339	* No checking on area overflow.
	340	*/
	341	char *
	342	tgetstr(id, area)
	343	char id, *area;
	344	{
	345	register char *bp = tbuf;
	346
	347	for (;;) {
	348	bp = tskip(bp);
	349	if (!*bp)
	350	return (0);
	351	if (bp++ != id[0] \|\| bp == 0 \|\| *bp++ != id[1])
	352	continue;
	353	if (*bp == '@')
	354	return (0);
	355	if (*bp != '=')
	356	continue;
	357	bp++;
	358	return (tdecode(bp, area));
	359	}
	360	}
	361
	362	/*
	363	* Tdecode does the grung work to decode the
	364	* string capability escapes.
	365	*/
	366	static char *
	367	tdecode(str, area)
	368	register char *str;
	369	char **area;
	370	{
	371	register char *cp;
	372	register int c;
	373	register char *dp;
	374	int i;
	375
	376	cp = *area;
	377	while ((c = *str++) && c != ':') {
	378	switch (c) {
	379
	380	case '^':
	381	c = *str++ & 037;
	382	break;
	383
	384	case '\\':
	385	dp = "E\033^^\\\\::n\nr\rt\tb\bf\f";
	386	c = *str++;
	387	nextc:
	388	if (*dp++ == c) {
	389	c = *dp++;
	390	break;
	391	}
	392	dp++;
	393	if (*dp)
	394	goto nextc;
	395	if (isdigit(c)) {
	396	c -= '0', i = 2;
	397	do
	398	c <<= 3, c \|= *str++ - '0';
	399	while (--i && isdigit(*str));
	400	}
	401	break;
	402	}
	403	*cp++ = c;
	404	}
	405	*cp++ = 0;
	406	str = *area;
	407	*area = cp;
	408	return (str);
	409	}