OpenSolaris_b135/cmd/captoinfo/otermcap.c
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1988 AT&T */
/* All Rights Reserved */
#pragma ident "%Z%%M% %I% %E% SMI"
/* Copyright (c) 1979 Regents of the University of California */
/* Modified to: */
/* 1) remember the name of the first tc= parameter */
/* encountered during parsing. */
/* 2) handle multiple invocations of tgetent(). */
/* 3) tskip() is now available outside of the library. */
/* 4) remember $TERM name for error messages. */
/* 5) have a larger buffer. */
/* 6) really fix the bug that 5) got around. This fix by */
/* Marion Hakanson, orstcs!hakanson */
#include "otermcap.h"
#define MAXHOP 32 /* max number of tc= indirections */
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/uio.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <signal.h> /* use this file to determine if this is SVR4.0 system */
#ifdef SIGSTOP /* SVR4.0 and beyond */
#define E_TERMCAP "/usr/share/lib/termcap"
#else
#define E_TERMCAP "/etc/termcap"
#endif
/*
* termcap - routines for dealing with the terminal capability data base
*
* BUG: Should use a "last" pointer in tbuf, so that searching
* for capabilities alphabetically would not be a n**2/2
* process when large numbers of capabilities are given.
* Note: If we add a last pointer now we will screw up the
* tc capability. We really should compile termcap.
*
* Essentially all the work here is scanning and decoding escapes
* in string capabilities. We don't use stdio because the editor
* doesn't, and because living w/o it is not hard.
*/
static char *tbuf;
static int hopcount; /* detect infinite loops in termcap, init 0 */
char *tskip(char *);
char *otgetstr(char *, char **);
/* Tony Hansen */
int TLHtcfound = 0;
char TLHtcname[16];
static char *termname;
static int _tgetent(char *, char *);
static int otnchktc(void);
static char *tdecode(char *, char **);
static int otnamatch(char *);
/*
* Get an entry for terminal name in buffer bp,
* from the termcap file. Parse is very rudimentary;
* we just notice escaped newlines.
*/
int
otgetent(char *bp, char *name)
{
/* Tony Hansen */
int ret;
TLHtcfound = 0;
hopcount = 0;
termname = name;
ret = _tgetent(bp, name);
/*
* There is some sort of bug in the check way down below to prevent
* buffer overflow. I really don't want to track it down, so I
* upped the standard buffer size and check here to see if the created
* buffer is larger than the old buffer size.
*/
if (strlen(bp) >= 1024)
(void) fprintf(stderr,
"tgetent(): TERM=%s: Termcap entry is too long.\n",
termname);
return (ret);
}
static int
_tgetent(char *bp, char *name)
{
char *cp;
int c;
int i = 0, cnt = 0;
char ibuf[TBUFSIZE];
char *cp2;
int tf;
tbuf = bp;
tf = 0;
#ifndef V6
cp = getenv("TERMCAP");
/*
* TERMCAP can have one of two things in it. It can be the
* name of a file to use instead of /etc/termcap. In this
* case it better start with a "/". Or it can be an entry to
* use so we don't have to read the file. In this case it
* has to already have the newlines crunched out.
*/
if (cp && *cp) {
if (*cp != '/') {
cp2 = getenv("TERM");
if (cp2 == (char *)0 || strcmp(name, cp2) == 0) {
(void) strcpy(bp, cp);
return (otnchktc());
} else {
tf = open(E_TERMCAP, 0);
}
} else
tf = open(cp, 0);
}
if (tf == 0)
tf = open(E_TERMCAP, 0);
#else
tf = open(E_TERMCAP, 0);
#endif
if (tf < 0)
return (-1);
for (; ; ) {
cp = bp;
for (; ; ) {
if (i == cnt) {
cnt = read(tf, ibuf, TBUFSIZE);
if (cnt <= 0) {
(void) close(tf);
return (0);
}
i = 0;
}
c = ibuf[i++];
if (c == '\n') {
if (cp > bp && cp[-1] == '\\') {
cp--;
continue;
}
break;
}
if (cp >= bp + TBUFSIZE) {
(void) fprintf(stderr, "tgetent(): TERM=%s: "
"Termcap entry too long\n", termname);
break;
} else
*cp++ = c;
}
*cp = 0;
/*
* The real work for the match.
*/
if (otnamatch(name)) {
(void) close(tf);
return (otnchktc());
}
}
}
/*
* otnchktc: check the last entry, see if it's tc=xxx. If so,
* recursively find xxx and append that entry (minus the names)
* to take the place of the tc=xxx entry. This allows termcap
* entries to say "like an HP2621 but doesn't turn on the labels".
* Note that this works because of the left to right scan.
*/
static int
otnchktc(void)
{
char *p, *q;
#define TERMNAMESIZE 16
char tcname[TERMNAMESIZE]; /* name of similar terminal */
char tcbuf[TBUFSIZE];
char *holdtbuf = tbuf;
int l;
p = tbuf + strlen(tbuf) - 2; /* before the last colon */
while (*--p != ':')
if (p < tbuf) {
(void) fprintf(stderr, "tnchktc(): TERM=%s: Bad "
"termcap entry\n", termname);
return (0);
}
p++;
/* p now points to beginning of last field */
if (p[0] != 't' || p[1] != 'c')
return (1);
(void) strncpy(tcname, p + 3, TERMNAMESIZE); /* TLH */
q = tcname;
while (*q && *q != ':')
q++;
*q = 0;
if (++hopcount > MAXHOP) {
(void) fprintf(stderr, "tnchktc(): TERM=%s: Infinite tc= "
"loop\n", termname);
return (0);
}
if (_tgetent(tcbuf, tcname) != 1)
return (0);
/* Tony Hansen */
TLHtcfound++;
(void) strcpy(TLHtcname, tcname);
for (q = tcbuf; *q != ':'; q++)
;
l = p - holdtbuf + strlen(q);
if (l > TBUFSIZE) {
(void) fprintf(stderr, "tnchktc(): TERM=%s: Termcap entry "
"too long\n", termname);
q[TBUFSIZE - (p - holdtbuf)] = 0;
}
(void) strcpy(p, q + 1);
tbuf = holdtbuf;
return (1);
}
/*
* Tnamatch deals with name matching. The first field of the termcap
* entry is a sequence of names separated by |'s, so we compare
* against each such name. The normal : terminator after the last
* name (before the first field) stops us.
*/
static int
otnamatch(char *np)
{
char *Np, *Bp;
Bp = tbuf;
if (*Bp == '#')
return (0);
for (;;) {
for (Np = np; *Np && *Bp == *Np; Bp++, Np++)
continue;
if (*Np == 0 && (*Bp == '|' || *Bp == ':' || *Bp == 0))
return (1);
while (*Bp && *Bp != ':' && *Bp != '|')
Bp++;
if (*Bp == 0 || *Bp == ':')
return (0);
Bp++;
}
}
/*
* Skip to the next field. Notice that this is very dumb, not
* knowing about \: escapes or any such. If necessary, :'s can be put
* into the termcap file in octal.
*/
char *
tskip(char *bp)
{
while (*bp && *bp != ':')
bp++;
if (*bp == ':')
bp++;
return (bp);
}
/*
* Return the (numeric) option id.
* Numeric options look like
* li#80
* i.e. the option string is separated from the numeric value by
* a # character. If the option is not found we return -1.
* Note that we handle octal numbers beginning with 0.
*/
int
otgetnum(char *id)
{
int i, base;
char *bp = tbuf;
for (;;) {
bp = tskip(bp);
if (*bp == 0)
return (-1);
if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1])
continue;
if (*bp == '@')
return (-1);
if (*bp != '#')
continue;
bp++;
base = 10;
if (*bp == '0')
base = 8;
i = 0;
while (isdigit(*bp))
i *= base, i += *bp++ - '0';
return (i);
}
}
/*
* Handle a flag option.
* Flag options are given "naked", i.e. followed by a : or the end
* of the buffer. Return 1 if we find the option, or 0 if it is
* not given.
*/
int
otgetflag(char *id)
{
char *bp = tbuf;
for (;;) {
bp = tskip(bp);
if (!*bp)
return (0);
if (*bp++ == id[0] && *bp != 0 && *bp++ == id[1]) {
if (!*bp || *bp == ':')
return (1);
else if (*bp == '@')
return (0);
}
}
}
/*
* Get a string valued option.
* These are given as
* cl=^Z
* Much decoding is done on the strings, and the strings are
* placed in area, which is a ref parameter which is updated.
* No checking on area overflow.
*/
char *
otgetstr(char *id, char **area)
{
char *bp = tbuf;
for (; ; ) {
bp = tskip(bp);
if (!*bp)
return (0);
if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1])
continue;
if (*bp == '@')
return (0);
if (*bp != '=')
continue;
bp++;
return (tdecode(bp, area));
}
}
/*
* Tdecode does the grung work to decode the
* string capability escapes.
*/
static char *
tdecode(char *str, char **area)
{
char *cp;
int c;
char *dp;
int i;
cp = *area;
while ((c = *str++) != '\0' && c != ':') {
switch (c) {
case '^':
c = *str++ & 037;
break;
case '\\':
dp = "E\033^^\\\\::n\nr\rt\tb\bf\f";
c = *str++;
nextc:
if (*dp++ == c) {
c = *dp++;
break;
}
dp++;
if (*dp)
goto nextc;
if (isdigit(c)) {
c -= '0', i = 2;
do
c <<= 3, c |= *str++ - '0';
while (--i && isdigit(*str))
;
}
break;
}
*cp++ = c;
}
*cp++ = 0;
str = *area;
*area = cp;
return (str);
}