/*
 * gawkmisc.atr --- miscellaneous gawk routines that are OS specific.
 */

/* 
 * Copyright (C) 1986, 1988, 1989, 1991-1996 the Free Software Foundation, Inc.
 * 
 * This file is part of GAWK, the GNU implementation of the
 * AWK Progamming Language.
 * 
 * GAWK is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 * 
 * GAWK is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#include <string.h>

char quote = '\'';
#ifndef DEFPATH
char *defpath = ".,c:\\lib\\awk,c:\\gnu\\lib\\awk";
#else
char *defpath = DEFPATH;
#endif
char envsep  = ',';


/* gawk_name --- pull out the "gawk" part from how the OS called us */

char *
gawk_name(filespec)
const char *filespec;
{
	char *p, *q;

	p = (char *)filespec;

	if ((q = strrchr(p, '\\')) != NULL)
		p = q + 1;
	if ((q = strrchr(p, '/')) != NULL)
		p = q + 1;
	if ((q = strchr(p, '.')) != NULL)
		*q = '\0';
	strlwr(p);

	return (p == NULL ? (char *)filespec : (char *)p);
}

/* os_arg_fixup --- fixup the command line */

void
os_arg_fixup(argcp, argvp)
int *argcp;
char ***argvp;
{
	/* no-op */
	return;
}

/* os_devopen --- open special per-OS devices */

int
os_devopen(name, flag)
const char *name;
int flag;
{
	/* no-op */
	return INVALID_HANDLE;
}

/* optimal_bufsize --- determine optimal buffer size */

size_t
optimal_bufsize(fd, stb)
int fd;
struct stat *stb;
{
	/* force all members to zero in case OS doesn't use all of them. */
	memset(stb, '\0', sizeof(struct stat));

	/* The atari has the st_blksize structure, so we just use it. */
#define DEFBLKSIZE	(stb->st_blksize ? stb->st_blksize : BUFSIZ)

	/*
	 * On ST redirected stdin does not have a name attached
	 * (this could be hard to do to) and fstat would fail
	 */
	if (fd == 0)
		return BUFSIZ;
	if (fstat(fd, stb) == -1)
		fatal("can't stat fd %d (%s)", fd, strerror(errno));
	if (S_ISREG(stb->st_mode)
	    && 0 < stb->st_size && stb->st_size < DEFBLKSIZE) /* small file */
		return stb->st_size;
	return DEFBLKSIZE;
}

/* ispath --- return true if path has directory components */

int
ispath(file)
const char *file;
{
	return (strchr(file, '/') != NULL || strchr(file, '\\') != NULL);
}

/* isdirpunct --- return true if char is a directory separator */

int
isdirpunct(c)
int c;
{
	return (c == '/' || c == '\\');
}

/* os_close_on_exec --- set close on exec flag, print warning if fails */

void
os_close_on_exec(fd, name, what, dir)
int fd;
const char *name, *what, *dir;
{
	if (fcntl(fd, F_SETFD, 1) < 0)
		warning("%s %s `%s': could not set close-on-exec: %s",
			what, dir, name, strerror(errno));
}

/* os_isdir --- is this an fd on a directory? */

#if ! defined(S_ISDIR) && defined(S_IFDIR)
#define	S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif

int
os_isdir(fd)
int fd;
{
	struct stat sbuf;

	return (fstat(fd, &sbuf) == 0 && S_ISDIR(sbuf.st_mode));
}

/* os_is_setuid --- true if running setuid root */

int
os_is_setuid()
{
	return 0;
}

/* os_setbinmode --- set binary mode on file */

int
os_setbinmode (fd, mode)
int fd, mode;
{
	return 0;
}

/* os_restore_mode --- restore the original mode of the console device */

void
os_restore_mode (fd)
int fd;
{
	/* no-op */
	return;
}