229 lines
6.4 KiB
C
229 lines
6.4 KiB
C
/* $NetBSD: termcap.c,v 1.15 1998/10/14 13:51:36 agc Exp $ */
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/*
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)termcap.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: termcap.c,v 1.15 1998/10/14 13:51:36 agc Exp $");
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#endif
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#endif /* not lint */
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#define PBUFSIZ 512 /* max length of filename path */
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#define PVECSIZ 32 /* max number of names in path */
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#include <stdio.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include <termcap.h>
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#include "pathnames.h"
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/*
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* termcap - routines for dealing with the terminal capability data base
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*
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* BUG: Should use a "last" pointer in tbuf, so that searching
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* for capabilities alphabetically would not be a n**2/2
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* process when large numbers of capabilities are given.
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* Note: If we add a last pointer now we will screw up the
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* tc capability. We really should compile termcap.
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*
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* Essentially all the work here is scanning and decoding escapes
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* in string capabilities. We don't use stdio because the editor
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* doesn't, and because living w/o it is not hard.
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*/
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static char *tbuf; /* termcap buffer */
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/*
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* Get an entry for terminal name in buffer bp from the termcap file.
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*/
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int
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tgetent(bp, name)
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char *bp;
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const char *name;
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{
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char *p;
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char *cp;
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char *dummy;
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char **fname;
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char *home;
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int i;
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char pathbuf[PBUFSIZ]; /* holds raw path of filenames */
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char *pathvec[PVECSIZ]; /* to point to names in pathbuf */
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char *termpath;
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fname = pathvec;
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tbuf = bp;
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p = pathbuf;
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cp = getenv("TERMCAP");
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/*
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* TERMCAP can have one of two things in it. It can be the
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* name of a file to use instead of
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* /usr/share/misc/termcap. In this case it better start with
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* a "/". Or it can be an entry to use so we don't have to
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* read the file. In this case it has to already have the
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* newlines crunched out. If TERMCAP does not hold a file
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* name then a path of names is searched instead. The path is
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* found in the TERMPATH variable, or becomes _PATH_DEF
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* ("$HOME/.termcap /usr/share/misc/termcap") if no TERMPATH
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* exists.
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*/
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if (!cp || *cp != '/') { /* no TERMCAP or it holds an entry */
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if ((termpath = getenv("TERMPATH")) != NULL)
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strncpy(pathbuf, termpath, PBUFSIZ);
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else {
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if ((home = getenv("HOME")) != NULL) {
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/* set up default */
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p += strlen(home); /* path, looking in */
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(void)strncpy(pathbuf, home,
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sizeof(pathbuf) - 1); /* $HOME first */
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*p++ = '/';
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} /* if no $HOME look in current directory */
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strncpy(p, _PATH_DEF, PBUFSIZ - (size_t)(p - pathbuf));
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}
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}
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else /* user-defined name in TERMCAP */
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strncpy(pathbuf, cp, PBUFSIZ); /* still can be tokenized */
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*fname++ = pathbuf; /* tokenize path into vector of names */
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while (*++p)
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if (*p == ' ' || *p == ':') {
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*p = '\0';
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while (*++p)
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if (*p != ' ' && *p != ':')
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break;
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if (*p == '\0')
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break;
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*fname++ = p;
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if (fname >= pathvec + PVECSIZ) {
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fname--;
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break;
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}
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}
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*fname = (char *) 0; /* mark end of vector */
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if (cp && *cp && *cp != '/')
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if (cgetset(cp) < 0)
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return (-2);
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/*
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* XXX potential security hole here in a set-id program if the
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* user had setup name to be built from a path they can not
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* normally read.
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*/
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dummy = NULL;
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i = cgetent(&dummy, pathvec, name);
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if (i == 0) {
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strncpy(bp, dummy, 1024);
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bp[1023] = '\0';
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}
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if (dummy)
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free(dummy);
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/* no tc reference loop return code in libterm XXX */
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if (i == -3)
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return (-1);
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return (i + 1);
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}
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/*
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* Return the (numeric) option id.
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* Numeric options look like
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* li#80
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* i.e. the option string is separated from the numeric value by
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* a # character. If the option is not found we return -1.
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* Note that we handle octal numbers beginning with 0.
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*/
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int
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tgetnum(id)
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const char *id;
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{
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long num;
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if (cgetnum(tbuf, id, &num) == 0)
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return (int)(num);
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else
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return (-1);
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}
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/*
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* Handle a flag option.
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* Flag options are given "naked", i.e. followed by a : or the end
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* of the buffer. Return 1 if we find the option, or 0 if it is
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* not given.
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*/
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int
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tgetflag(id)
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const char *id;
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{
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return (cgetcap(tbuf, id, ':') != NULL);
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}
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/*
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* Get a string valued option.
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* These are given as
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* cl=^Z
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* Much decoding is done on the strings, and the strings are
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* placed in area, which is a ref parameter which is updated.
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* No checking on area overflow.
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*/
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char *
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tgetstr(id, area)
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const char *id;
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char **area;
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{
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char ids[3];
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char *s;
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int i;
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/*
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* XXX
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* This is for all the boneheaded programs that relied on tgetstr
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* to look only at the first 2 characters of the string passed...
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*/
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*ids = *id;
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ids[1] = id[1];
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ids[2] = '\0';
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if ((i = cgetstr(tbuf, ids, &s)) < 0)
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return NULL;
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strcpy(*area, s);
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*area += i + 1;
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return (s);
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}
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