371 lines
8.6 KiB
C
371 lines
8.6 KiB
C
static char sccsid[] = "@(#)27 1.10 src/bos/usr/ccs/lib/libtermcap/termcap.c, libtermcap, bos411, 9428A410j 6/1/94 16:48:33";
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/*
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* COMPONENT_NAME: (LIBTERMCAP) Termcap Library
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*
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* FUNCTIONS: tdecode, tgetent, tgetflag, tgetnum, tgetstr, tnamatch, tnchktc
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* tskip
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*
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* ORIGINS: 26 27
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*
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* This module contains IBM CONFIDENTIAL code. -- (IBM
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* Confidential Restricted when combined with the aggregated
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* modules for this product)
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* SOURCE MATERIALS
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* (C) COPYRIGHT International Business Machines Corp. 1985, 1994
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* All Rights Reserved
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*
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* US Government Users Restricted Rights - Use, duplication or
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* disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
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*
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* Copyright (c) 1980 Regents of the University of California.
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* All rights reserved. The Berkeley software License Agreement
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* specifies the terms and conditions for redistribution.
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*/
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#include <ctype.h>
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#define E_TERMCAP "/etc/termcap" /* location of termcap file */
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#define MAXHOP 32 /* max number of tc= indirections */
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#include "termc_msg.h"
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nl_catd catd = NULL;
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#define MSGSTR(Num, Str) catgets(catd, MS_TERMC, Num, Str)
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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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* NOTE: 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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* 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;
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static int hopcount; /* detect infinite loops in termcap, init 0 */
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static char *tskip();
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static char *tdecode();
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char *tgetstr();
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char *getenv();
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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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tgetent(bp, name)
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char *bp; /* character buffer of size 1024 holds the terminals capabilities */
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char *name; /* name of terminal (ie terminal type) */
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{
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char *cp;
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int c;
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int i = 0, cnt = 0;
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char ibuf[BUFSIZ];
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char *cp2;
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int tf;
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int rc;
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if (catd == NULL) {
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catd = catopen(MF_TERMC, NL_CAT_LOCALE);
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}
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tbuf = bp;
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tf = 0;
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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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rc = tnchktc();
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hopcount = 0;
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return(rc);
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} else {
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tf = open(E_TERMCAP, 0);
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}
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} else
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tf = open(cp, 0);
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}
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if (tf==0)
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tf = open(E_TERMCAP, 0);
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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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fprintf(stderr,MSGSTR(MS_TOOLONG,"Termcap entry too long\n"));
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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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rc = tnchktc();
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hopcount = 0;
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return(rc);
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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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tnchktc()
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{
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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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fprintf(stderr, MSGSTR(MS_BAD,"Bad termcap entry\n"));
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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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fprintf(stderr, MSGSTR(MS_INFINITE,"Infinite tc= loop\n"));
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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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fprintf(stderr, MSGSTR(MS_TOOLONG,"Termcap entry too long\n"));
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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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tnamatch(np)
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char *np; /* next buffer */
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{
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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.
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* Note: Termcap does not know about "\:", 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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char *bp; /* terminal capabilites buffer */
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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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tgetnum(id)
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char *id; /* two character capability id */
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{
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int i, base;
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char *bp = tbuf;
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for (;;) {
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bp = tskip(bp);
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if (*bp == 0) /* capability not found (end of buffer) */
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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 == '@') /* capability not supported for this termianl */
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return(-1);
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if (*bp != '#') /* numeric value is next */
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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)) /* convert to number */
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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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tgetflag(id)
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char *id; /* two character capability id */
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{
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char *bp = tbuf;
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for (;;) {
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bp = tskip(bp);
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if (!*bp) /* end of capability buffer */
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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 == ':') /* boolean capability */
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return (1);
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else if (*bp == '@') /* capability not supported */
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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; /* two character capability id */
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char **area; /* pointer into bp (capability buffer) */
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{
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char *bp = tbuf;
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for (;;) {
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bp = tskip(bp);
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if (!*bp) /* if end of capability buffer */
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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 == '@') /* capability not supported for this termianl */
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return(0);
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if (*bp != '=') /* string value next */
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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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char *str; /* capbablitity buffer */
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char **area; /* pointer into buffer */
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{
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char *cp;
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int c;
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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 '\\': /* list of accepted escape sequences */
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dp = "E\033^^\\\\::n\nr\rt\tb\bf\f";
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c = *str++; /* decode escape sequences */
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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';
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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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