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Revision 1.18, Sun Aug 15 10:59:01 1999 UTC (22 years, 1 month ago) by blymn
Branch: MAIN
Changes since 1.17: +137 -33 lines

Added new interface to termcap that allows the manipulation of multiple
termcap entries simultaneously and lifts the 1024 byte limit on the termcap
entry.  The original termcap api is unchanged but also no longer has
the 1024 byte limit if the termcap functions are used.

/*	$NetBSD: termcap.c,v 1.18 1999/08/15 10:59:01 blymn Exp $	*/

/*
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)termcap.c	8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: termcap.c,v 1.18 1999/08/15 10:59:01 blymn Exp $");
#endif
#endif /* not lint */

#define	PBUFSIZ		512	/* max length of filename path */
#define	PVECSIZ		32	/* max number of names in path */

#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <termcap.h>
#include <errno.h>
#include "pathnames.h"

/* internal definition of tinfo structure - just a pointer to the malloc'ed
 * buffer for now.
 */
struct tinfo
{
	char *info;
};

/*
 * 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;	/* termcap buffer */
static  struct tinfo *fbuf;     /* untruncated termcap buffer */

/*
 * Get an extended entry for the terminal name.  This differs from
 * tgetent only in a) the buffer is malloc'ed for the caller and
 * b) the termcap entry is not truncated to 1023 characters.
 */

int
t_getent(bp, name)
	struct tinfo **bp;
	const char *name;
{
	char  *p;
	char  *cp;
	char **fname;
	char  *home;
	int    i;
	char   pathbuf[PBUFSIZ];	/* holds raw path of filenames */
	char  *pathvec[PVECSIZ];	/* to point to names in pathbuf */
	char  *termpath;

	if ((*bp = malloc(sizeof(struct tinfo))) == NULL) return 0;
	
	fname = pathvec;
	p = pathbuf;
	cp = getenv("TERMCAP");
	/*
	 * TERMCAP can have one of two things in it. It can be the
	 * name of a file to use instead of
	 * /usr/share/misc/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 cgetset() withh crunch out the
	 * newlines.  If TERMCAP does not hold a file name then a path
	 * of names is searched instead.  The path is found in the
	 * TERMPATH variable, or becomes _PATH_DEF ("$HOME/.termcap
	 * /usr/share/misc/termcap") if no TERMPATH exists.
	 */
	if (!cp || *cp != '/') {	/* no TERMCAP or it holds an entry */
		if ((termpath = getenv("TERMPATH")) != NULL)
			strncpy(pathbuf, termpath, PBUFSIZ);
		else {
			if ((home = getenv("HOME")) != NULL) {
				/* set up default */
				p += strlen(home);	/* path, looking in */
				(void)strncpy(pathbuf, home,
				    sizeof(pathbuf) - 1);	/* $HOME first */
				*p++ = '/';
			}	/* if no $HOME look in current directory */
			strncpy(p, _PATH_DEF, PBUFSIZ - (size_t)(p - pathbuf));
		}
	}
	else				/* user-defined name in TERMCAP */
		strncpy(pathbuf, cp, PBUFSIZ);	/* still can be tokenized */

	*fname++ = pathbuf;	/* tokenize path into vector of names */
	while (*++p)
		if (*p == ' ' || *p == ':') {
			*p = '\0';
			while (*++p)
				if (*p != ' ' && *p != ':')
					break;
			if (*p == '\0')
				break;
			*fname++ = p;
			if (fname >= pathvec + PVECSIZ) {
				fname--;
				break;
			}
		}
	*fname = (char *) 0;			/* mark end of vector */
	if (cp && *cp && *cp != '/')
		if (cgetset(cp) < 0)
			return (-2);

	/*
	 * XXX potential security hole here in a set-id program if the
	 * user had setup name to be built from a path they can not
	 * normally read.
	 */
 	(*bp)->info = NULL;
 	i = cgetent(&((*bp)->info), pathvec, name);      

	/* no tc reference loop return code in libterm XXX */
	if (i == -3)
		return (-1);
	return (i + 1);
}

/*
 * Get an entry for terminal name in buffer bp from the termcap file.
 */
int
tgetent(bp, name)
	char *bp;
	const char *name;
{
	int i, plen, elen, c;
        char *ptrbuf = NULL;
	
	i = t_getent(&fbuf, name);
	
	if (i == 1) {
		  /* stash the full buffer pointer as the ZZ capability
		     in the termcap buffer passed.
		  */
                plen = asprintf(&ptrbuf, ":ZZ=%p", fbuf->info);
		strncpy(bp, fbuf->info, 1024);
		bp[1023] = '\0';
                elen = strlen(bp);
		  /* backup over the entry if the addition of the full
		     buffer pointer will overflow the buffer passed.  We
		     want to truncate the termcap entry on a capability
		     boundary.
		  */
                if ((elen + plen) > 1023) {
			bp[1023 - plen] = '\0';
			for (c = (elen - plen); c > 0; c--) {
				if (bp[c] == ':') {
					bp[c] = '\0';
					break;
				}
			}
		}
		
		strcat(bp, ptrbuf);
                tbuf = bp;
	}

	return i;
}

/*
 * 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.
 */
int

t_getnum(info, id)
	struct tinfo *info;
	const char *id;
{
	long num;

	if (cgetnum(info->info, id, &num) == 0)
		return (int)(num);
	else
		return (-1);
}

int
tgetnum(id)
	const char *id;
{
	return t_getnum(fbuf, id);
}

/*
 * 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.
 */
int t_getflag(info, id)
	struct tinfo *info;
	const char *id;
{
	return (cgetcap(info->info, id, ':') != NULL);
}

int
tgetflag(id)
	const char *id;
{
	return t_getflag(fbuf, id);
}

/*
 * 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.
 * limit is the number of characters allowed to be put into
 * area, this is updated.
 */
char *
t_getstr(info, id, area, limit)
	struct tinfo *info;
	const char *id;
	char **area;
	int *limit;
{
	char ids[3];
	char *s;
	int i;

	/*
	 * XXX
	 * This is for all the boneheaded programs that relied on tgetstr
	 * to look only at the first 2 characters of the string passed...
	 */
	*ids = *id;
	ids[1] = id[1];
	ids[2] = '\0';

	if ((i = cgetstr(info->info, ids, &s)) < 0) {
		errno = ENOENT;
		return NULL;
	}
	
	  /* check if there is room for the new entry to be put into area */
	if (limit != NULL && (*limit < i)) {
		errno = E2BIG;
		return NULL;
	}
  	
	strcpy(*area, s);
	*area += i + 1;
	if (limit != NULL) *limit -= i;
	
 	return (s);
}
 
/*
 * 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)
	const char *id;
	char **area;
{
	struct tinfo dummy;

	if ((id[0] == 'Z') && (id[1] == 'Z')) {
		dummy.info = tbuf;
		return t_getstr(&dummy, id, area, NULL);
	}
	else
		return t_getstr(fbuf, id, area, NULL);
}

/*
 * Free the buffer allocated by t_getent
 *
 */
void
t_freent(info)
	struct tinfo *info;
{
	free(info->info);
	free(info);
}