/*

 * Copyright (c) 1989, 1993

 *	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.

 * 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	8.1 (Berkeley) 6/4/93";

#endif /* LIBC_SCCS and not lint */

#include <ttyent.h>

#include <stdio.h>

#include <stdio_ext.h>

#include <ctype.h>

#include <string.h>

#define flockfile(s) _IO_flockfile (s)

#define funlockfile(s) _IO_funlockfile (s)

static char zapchar;

static FILE *tf;

struct ttyent *

__getttynam (const char *tty)

{

	struct ttyent *t;

	__setttyent();

	while ((t = __getttyent()))

		if (!strcmp(tty, t->ty_name))

			break;

	__endttyent();

	return (t);

}

weak_alias (__getttynam, getttynam)

static char *skip (char *) __THROW;

static char *value (char *) __THROW;

struct ttyent *

__getttyent (void)

{

	static struct ttyent tty;

	int c;

	char *p;

#define	MAXLINELENGTH	100

	static char line[MAXLINELENGTH];

	if (!tf && !__setttyent())

		return (NULL);

	flockfile (tf);

	for (;;) {

		if (!__fgets_unlocked(p = line, sizeof(line), tf)) {

			funlockfile (tf);

			return (NULL);

		}

		/* skip lines that are too big */

		if (!strchr (p, '\n')) {

			while ((c = __getc_unlocked(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;

	}

	/* We can release the lock only here since `zapchar' is global.  */

	funlockfile(tf);

	if (zapchar == '#' || *p == '#')

		while ((c = *++p) == ' ' || c == '\t')

			;

	tty.ty_comment = p;

	if (*p == 0)

		tty.ty_comment = 0;

	if ((p = strchr (p, '\n')))

		*p = '\0';

	return (&tty);

}

libc_hidden_def (__getttyent)

weak_alias (__getttyent, getttyent)

#define	QUOTED	1

/*

 * Skip over the current field, removing quotes, and return a pointer to

 * the next field.

 */

static char *

skip (char *p)

{

	char *t;

	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 (char *p)

{

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

}

int

__setttyent (void)

{

	if (tf) {

		(void)rewind(tf);

		return (1);

	} else if ((tf = fopen(_PATH_TTYS, "rce"))) {

		/* We do the locking ourselves.  */

		__fsetlocking (tf, FSETLOCKING_BYCALLER);

		return (1);

	}

	return (0);

}

libc_hidden_def (__setttyent)

weak_alias (__setttyent, setttyent)

int

__endttyent (void)

{

	int rval;

	if (tf) {

		rval = !(fclose(tf) == EOF);

		tf = NULL;

		return (rval);

	}

	return (1);

}

libc_hidden_def (__endttyent)

weak_alias (__endttyent, endttyent)