477 lines
10 KiB
C
477 lines
10 KiB
C
/* $NetBSD: printcap.c,v 1.7 1995/11/28 19:43:29 jtc Exp $ */
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/*
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* Copyright (c) 1983, 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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#ifndef lint
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static char sccsid[] = "@(#)printcap.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#include <sys/param.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include "lp.h"
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#include "pathnames.h"
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#ifndef BUFSIZ
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#define BUFSIZ 1024
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#endif
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#define MAXHOP 32 /* max number of tc= indirections */
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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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#define PRINTCAP
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#ifdef PRINTCAP
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#define tgetent pgetent
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#define tskip pskip
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#define tgetstr pgetstr
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#define tdecode pdecode
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#define tgetnum pgetnum
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#define tgetflag pgetflag
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#define tdecode pdecode
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#define tnchktc pnchktc
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#define tnamatch pnamatch
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#define V6
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#endif
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static FILE *pfp = NULL; /* printcap data base file pointer */
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static char *tbuf;
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static int hopcount; /* detect infinite loops in termcap, init 0 */
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static char *tskip __P((char *));
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static char *tskip __P((char *bp));
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static char *tdecode __P((char *, char **));
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/*
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* Similar to tgetent except it returns the next enrty instead of
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* doing a lookup.
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*/
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int
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getprent(bp)
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register char *bp;
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{
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register int c, skip = 0;
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if (pfp == NULL) {
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seteuid(euid);
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pfp = fopen(_PATH_PRINTCAP, "r");
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seteuid(uid);
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if (pfp == NULL)
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return(-1);
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}
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tbuf = bp;
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for (;;) {
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switch (c = getc(pfp)) {
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case EOF:
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fclose(pfp);
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pfp = NULL;
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return(0);
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case '\n':
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if (bp == tbuf) {
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skip = 0;
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continue;
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}
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if (bp[-1] == '\\') {
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bp--;
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continue;
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}
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*bp = '\0';
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return(1);
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case '#':
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if (bp == tbuf)
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skip++;
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default:
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if (skip)
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continue;
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if (bp >= tbuf+BUFSIZ) {
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write(2, "Termcap entry too long\n", 23);
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*bp = '\0';
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return(1);
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}
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*bp++ = c;
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}
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}
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}
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void
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endprent()
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{
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if (pfp != NULL)
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fclose(pfp);
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}
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/*
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* Get an entry for terminal name in buffer bp,
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* from the termcap file. Parse is very rudimentary;
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* we just notice escaped newlines.
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*/
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int
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tgetent(bp, name)
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char *bp, *name;
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{
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register char *cp;
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register int c;
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register int i = 0, cnt = 0;
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char ibuf[BUFSIZ];
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int tf;
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tbuf = bp;
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tf = 0;
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#ifndef V6
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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 /etc/termcap. In this
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* case it better start with a "/". Or it can be an entry to
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* use so we don't have to read the file. In this case it
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* has to already have the newlines crunched out.
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*/
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if (cp && *cp) {
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if (*cp!='/') {
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cp2 = getenv("TERM");
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if (cp2==(char *) 0 || strcmp(name,cp2)==0) {
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strcpy(bp,cp);
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return(tnchktc());
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} else {
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seteuid(euid);
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tf = open(_PATH_PRINTCAP, 0);
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seteuid(uid);
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}
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} else
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/*
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* don't seteuid here incase TERMCAP is set to
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* some file we don't have access to.
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*/
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tf = open(cp, 0);
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}
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if (tf == 0) {
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seteuid(euid);
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tf = open(_PATH_PRINTCAP, 0);
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seteuid(uid);
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}
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#else
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seteuid(euid);
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tf = open(_PATH_PRINTCAP, 0);
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seteuid(uid);
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#endif
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if (tf < 0)
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return (-1);
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for (;;) {
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cp = bp;
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for (;;) {
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if (i == cnt) {
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cnt = read(tf, ibuf, BUFSIZ);
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if (cnt <= 0) {
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close(tf);
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return (0);
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}
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i = 0;
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}
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c = ibuf[i++];
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if (c == '\n') {
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if (cp > bp && cp[-1] == '\\'){
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cp--;
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continue;
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}
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break;
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}
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if (cp >= bp+BUFSIZ) {
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write(2,"Termcap entry too long\n", 23);
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break;
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} else
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*cp++ = c;
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}
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*cp = 0;
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/*
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* The real work for the match.
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*/
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if (tnamatch(name)) {
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close(tf);
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return(tnchktc());
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}
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}
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}
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/*
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* tnchktc: check the last entry, see if it's tc=xxx. If so,
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* recursively find xxx and append that entry (minus the names)
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* to take the place of the tc=xxx entry. This allows termcap
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* entries to say "like an HP2621 but doesn't turn on the labels".
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* Note that this works because of the left to right scan.
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*/
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int
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tnchktc()
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{
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register char *p, *q;
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char tcname[16]; /* name of similar terminal */
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char tcbuf[BUFSIZ];
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char *holdtbuf = tbuf;
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int l;
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p = tbuf + strlen(tbuf) - 2; /* before the last colon */
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while (*--p != ':')
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if (p<tbuf) {
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write(2, "Bad termcap entry\n", 18);
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return (0);
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}
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p++;
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/* p now points to beginning of last field */
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if (p[0] != 't' || p[1] != 'c')
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return(1);
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strcpy(tcname,p+3);
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q = tcname;
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while (q && *q != ':')
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q++;
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*q = 0;
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if (++hopcount > MAXHOP) {
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write(2, "Infinite tc= loop\n", 18);
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return (0);
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}
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if (tgetent(tcbuf, tcname) != 1)
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return(0);
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for (q=tcbuf; *q != ':'; q++)
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;
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l = p - holdtbuf + strlen(q);
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if (l > BUFSIZ) {
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write(2, "Termcap entry too long\n", 23);
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q[BUFSIZ - (p-tbuf)] = 0;
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}
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strcpy(p, q+1);
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tbuf = holdtbuf;
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return(1);
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}
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/*
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* Tnamatch deals with name matching. The first field of the termcap
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* entry is a sequence of names separated by |'s, so we compare
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* against each such name. The normal : terminator after the last
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* name (before the first field) stops us.
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*/
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int
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tnamatch(np)
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char *np;
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{
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register char *Np, *Bp;
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Bp = tbuf;
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if (*Bp == '#')
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return(0);
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for (;;) {
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for (Np = np; *Np && *Bp == *Np; Bp++, Np++)
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continue;
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if (*Np == 0 && (*Bp == '|' || *Bp == ':' || *Bp == 0))
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return (1);
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while (*Bp && *Bp != ':' && *Bp != '|')
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Bp++;
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if (*Bp == 0 || *Bp == ':')
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return (0);
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Bp++;
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}
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}
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/*
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* Skip to the next field. Notice that this is very dumb, not
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* knowing about \: escapes or any such. If necessary, :'s can be put
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* into the termcap file in octal.
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*/
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static char *
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tskip(bp)
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register char *bp;
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{
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while (*bp && *bp != ':')
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bp++;
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if (*bp == ':')
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bp++;
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return (bp);
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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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char *id;
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{
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register int i, base;
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register char *bp = tbuf;
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for (;;) {
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bp = tskip(bp);
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if (*bp == 0)
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return (-1);
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if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1])
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continue;
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if (*bp == '@')
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return(-1);
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if (*bp != '#')
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continue;
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bp++;
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base = 10;
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if (*bp == '0')
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base = 8;
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i = 0;
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while (isdigit(*bp))
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i *= base, i += *bp++ - '0';
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return (i);
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}
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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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char *id;
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{
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register char *bp = tbuf;
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for (;;) {
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bp = tskip(bp);
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if (!*bp)
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return (0);
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if (*bp++ == id[0] && *bp != 0 && *bp++ == id[1]) {
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if (!*bp || *bp == ':')
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return (1);
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else if (*bp == '@')
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return(0);
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}
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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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char *id, **area;
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{
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register char *bp = tbuf;
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for (;;) {
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bp = tskip(bp);
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if (!*bp)
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return (0);
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if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1])
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continue;
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if (*bp == '@')
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return(0);
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if (*bp != '=')
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continue;
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bp++;
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return (tdecode(bp, area));
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}
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}
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/*
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* Tdecode does the grung work to decode the
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* string capability escapes.
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*/
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static char *
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tdecode(str, area)
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register char *str;
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char **area;
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{
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register char *cp;
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register int c;
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register char *dp;
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int i;
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cp = *area;
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while ((c = *str++) && c != ':') {
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switch (c) {
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case '^':
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c = *str++ & 037;
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break;
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case '\\':
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dp = "E\033^^\\\\::n\nr\rt\tb\bf\f";
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c = *str++;
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nextc:
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if (*dp++ == c) {
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c = *dp++;
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break;
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}
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dp++;
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if (*dp)
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goto nextc;
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if (isdigit(c)) {
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c -= '0', i = 2;
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do
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c <<= 3, c |= *str++ - '0';
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while (--i && isdigit(*str));
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}
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break;
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}
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*cp++ = c;
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}
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*cp++ = 0;
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str = *area;
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*area = cp;
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return (str);
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}
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