Celestin Apprentice 2/Apprentice-Release2.iso/Tools/Languages/GCC 1.37.1r14/usr/lib/gen/getttyent.c

C/C++ Source or Header | 1993-03-20 | 4.6 KB | 201 lines | [TEXT/CPED]

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getttyent.c    5.10 (Berkeley) 3/23/91";
#endif /* LIBC_SCCS and not lint */

#include <ttyent.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>

static char zapchar;
static FILE *tf;

struct ttyent *
getttynam(tty)
    const char *tty;
{
    register struct ttyent *t;

    setttyent();
    while (t = getttyent())
        if (!strcmp(tty, t->ty_name))
            break;
    endttyent();
    return (t);
}

static char *skip(), *value();

struct ttyent *
getttyent()
{
    static struct ttyent tty;
    register int c;
    register char *p;
#define    MAXLINELENGTH    100
    static char line[MAXLINELENGTH];

    if (!tf && !setttyent())
        return (NULL);
    for (;;) {
        if (!fgets(p = line, sizeof(line), tf))
            return (NULL);
        /* skip lines that are too big */
        if (!index(p, '\n')) {
            while ((c = getc(tf)) != '\n' && c != EOF)
                ;
            continue;
        }
        while (isspace(*p))
            ++p;
        if (*p && *p != '#')
            break;
    }

    zapchar = 0;
    tty.ty_name = p;
    p = skip(p);
    if (!*(tty.ty_getty = p))
        tty.ty_getty = tty.ty_type = NULL;
    else {
        p = skip(p);
        if (!*(tty.ty_type = p))
            tty.ty_type = NULL;
        else
            p = skip(p);
    }
    tty.ty_status = 0;
    tty.ty_window = NULL;

#define    scmp(e)    !strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1])
#define    vcmp(e)    !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '='
    for (; *p; p = skip(p)) {
        if (scmp(_TTYS_OFF))
            tty.ty_status &= ~TTY_ON;
        else if (scmp(_TTYS_ON))
            tty.ty_status |= TTY_ON;
        else if (scmp(_TTYS_SECURE))
            tty.ty_status |= TTY_SECURE;
        else if (vcmp(_TTYS_WINDOW))
            tty.ty_window = value(p);
        else
            break;
    }

    if (zapchar == '#' || *p == '#')
        while ((c = *++p) == ' ' || c == '\t')
            ;
    tty.ty_comment = p;
    if (*p == 0)
        tty.ty_comment = 0;
    if (p = index(p, '\n'))
        *p = '\0';
    return (&tty);
}

#define    QUOTED    1

/*
 * Skip over the current field, removing quotes, and return a pointer to
 * the next field.
 */
static char *
skip(p)
    register char *p;
{
    register char *t;
    register int c, q;

    for (q = 0, t = p; (c = *p) != '\0'; p++) {
        if (c == '"') {
            q ^= QUOTED;    /* obscure, but nice */
            continue;
        }
        if (q == QUOTED && *p == '\\' && *(p+1) == '"')
            p++;
        *t++ = *p;
        if (q == QUOTED)
            continue;
        if (c == '#') {
            zapchar = c;
            *p = 0;
            break;
        }
        if (c == '\t' || c == ' ' || c == '\n') {
            zapchar = c;
            *p++ = 0;
            while ((c = *p) == '\t' || c == ' ' || c == '\n')
                p++;
            break;
        }
    }
    *--t = '\0';
    return (p);
}

static char *
value(p)
    register char *p;
{

    return ((p = index(p, '=')) ? ++p : NULL);
}

int
setttyent()
{

    if (tf) {
        (void)rewind(tf);
        return (1);
    } else if (tf = fopen(_PATH_TTYS, "r"))
        return (1);
    return (0);
}

int
endttyent()
{
    int rval;

    if (tf) {
        rval = !(fclose(tf) == EOF);
        tf = NULL;
        return (rval);
    }
    return (1);
}