430 lines
11 KiB
C
430 lines
11 KiB
C
/* $NetBSD: termcap.c,v 1.28 2000/05/12 15:25:25 christos 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 1.28 2000/05/12 15:25:25 christos 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 <assert.h>
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#include <ctype.h>
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#include <stdio.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 <errno.h>
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#include "pathnames.h"
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#include "termcap_private.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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static struct tinfo *fbuf; /* untruncated termcap buffer */
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/*
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* Get an extended entry for the terminal name. This differs from
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* tgetent only in a) the buffer is malloc'ed for the caller and
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* b) the termcap entry is not truncated to 1023 characters.
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*/
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int
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t_getent(bp, name)
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struct tinfo **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 **fname;
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char *home;
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int i, did_getset;
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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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_DIAGASSERT(bp != NULL);
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_DIAGASSERT(name != NULL);
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if ((*bp = malloc(sizeof(struct tinfo))) == NULL) return 0;
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fname = pathvec;
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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 cgetset() withh crunch out the
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* newlines. If TERMCAP does not hold a file name then a path
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* of names is searched instead. The path is found in the
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* TERMPATH variable, or becomes _PATH_DEF ("$HOME/.termcap
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* /usr/share/misc/termcap") if no TERMPATH 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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/*
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* try ignoring TERMCAP if it has a ZZ in it, we do this
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* because a TERMCAP with ZZ in it indicates the entry has been
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* exported by another program using the "old" interface, the
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* termcap entry has been truncated and ZZ points to an address
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* in the exporting programs memory space which is of no use
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* here - anyone who is exporting the termcap entry and then
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* reading it back again in the same program deserves to be
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* taken out, beaten up, dragged about, shot and then hurt some
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* more.
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*/
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did_getset = 0;
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if (cp && *cp && *cp != '/' && strstr(cp, ":ZZ") == NULL) {
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did_getset = 1;
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if (cgetset(cp) < 0)
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return (-2);
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}
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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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(*bp)->info = NULL;
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i = cgetent(&((*bp)->info), pathvec, name);
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/*
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* if we get an error and we skipped doing the cgetset before
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* we try with TERMCAP in place - we may be using a truncated
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* termcap entry but what else can one do?
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*/
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if ((i < 0) && (did_getset == 0)) {
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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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i = cgetent(&((*bp)->info), pathvec, name);
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}
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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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* 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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int i, plen, elen, c;
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char *ptrbuf = NULL;
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i = t_getent(&fbuf, name);
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if (i == 1) {
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/*
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* stash the full buffer pointer as the ZZ capability
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* in the termcap buffer passed.
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*/
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plen = asprintf(&ptrbuf, ":ZZ=%p", fbuf->info);
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strncpy(bp, fbuf->info, 1024);
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bp[1023] = '\0';
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elen = strlen(bp);
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/*
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* backup over the entry if the addition of the full
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* buffer pointer will overflow the buffer passed. We
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* want to truncate the termcap entry on a capability
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* boundary.
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*/
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if ((elen + plen) > 1023) {
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bp[1023 - plen] = '\0';
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for (c = (elen - plen); c > 0; c--) {
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if (bp[c] == ':') {
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bp[c] = '\0';
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break;
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}
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}
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}
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strcat(bp, ptrbuf);
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tbuf = bp;
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}
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return i;
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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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t_getnum(info, id)
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struct tinfo *info;
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const char *id;
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{
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long num;
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_DIAGASSERT(info != NULL);
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_DIAGASSERT(id != NULL);
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if (cgetnum(info->info, 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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int
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tgetnum(id)
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const char *id;
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{
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return t_getnum(fbuf, id);
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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 t_getflag(info, id)
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struct tinfo *info;
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const char *id;
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{
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_DIAGASSERT(info != NULL);
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_DIAGASSERT(id != NULL);
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return (cgetcap(info->info, id, ':') != NULL);
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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 t_getflag(fbuf, id);
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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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* limit is the number of characters allowed to be put into
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* area, this is updated.
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*/
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char *
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t_getstr(info, id, area, limit)
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struct tinfo *info;
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const char *id;
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char **area;
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size_t *limit;
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{
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char *s;
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int i;
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_DIAGASSERT(info != NULL);
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_DIAGASSERT(id != NULL);
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_DIAGASSERT(area != NULL);
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if ((i = cgetstr(info->info, id, &s)) < 0) {
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errno = ENOENT;
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if ((area == NULL) && (limit != NULL))
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*limit = 0;
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return NULL;
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}
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if (area != NULL) {
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/*
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* check if there is room for the new entry to be put into
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* area
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*/
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if (limit != NULL && (*limit < i)) {
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errno = E2BIG;
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return NULL;
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}
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strcpy(*area, s);
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*area += i + 1;
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if (limit != NULL) *limit -= i;
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return (s);
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} else {
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_DIAGASSERT(limit != NULL);
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*limit = i;
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return NULL;
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}
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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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struct tinfo dummy;
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char ids[3];
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_DIAGASSERT(id != NULL);
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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[0] = id[0];
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ids[1] = id[1];
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ids[2] = '\0';
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if ((id[0] == 'Z') && (id[1] == 'Z')) {
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dummy.info = tbuf;
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return t_getstr(&dummy, ids, area, NULL);
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}
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else
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return t_getstr(fbuf, ids, area, NULL);
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}
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/*
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* Free the buffer allocated by t_getent
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*
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*/
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void
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t_freent(info)
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struct tinfo *info;
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{
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_DIAGASSERT(info != NULL);
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free(info->info);
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free(info);
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}
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/*
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* Get the terminal name string from the termcap entry.
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*
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*/
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int
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t_getterm(info, area, limit)
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struct tinfo *info;
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char **area;
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size_t *limit;
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{
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char *endp;
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size_t count;
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_DIAGASSERT(info != NULL);
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if ((endp = strchr(info->info, ':')) == NULL) {
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errno = EINVAL;
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return -1;
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}
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count = endp - info->info + 1;
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if (area == NULL) {
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_DIAGASSERT(limit != NULL);
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*limit = count;
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return 0;
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} else {
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if ((limit != NULL) && (count > *limit)) {
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errno = E2BIG;
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return -1;
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}
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strncpy(*area, info->info, count);
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(*area)[count] = '\0';
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if (limit != NULL)
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*limit -= count;
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}
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return 0;
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}
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