8322 nl: misleading-indentation

[unleashed/tickless.git] / usr / src / 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);
}