/*
 * gawkmisc.vms --- miscellanious gawk routines that are OS specific.
 */

/* 
 * Copyright (C) 1986, 1988, 1989, 1991-1996, 2003, 2011 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
 */

char quote = '\'';
char *defpath = DEFPATH;
char *deflibpath = DEFLIBPATH;
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;

	/* "device:[root.][directory.subdir]GAWK.EXE;n" -> "GAWK" */
	p = strrchr(filespec, ']');  /* directory punctuation */
	q = strrchr(filespec, '>');  /* alternate <international> punct */

	if (p == NULL || q > p)
		p = q;
	p = strdup(p == NULL ? filespec : (p + 1));
	if ((q = strrchr(p, '.')) != NULL)
		*q = '\0';  /* strip .typ;vers */

	return p;
}

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

void
os_arg_fixup(argcp, argvp)
int *argcp;
char ***argvp;
{
	(void) vms_arg_fixup(argcp, argvp);
}

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

int
os_devopen(name, flag)
const char *name;
int flag;
{
	return vms_devopen(name, flag);
}

/* 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));

	/*
	 * These values correspond with the RMS multi-block count used by
	 * vms_open() in vms/vms_misc.c.
	 */
	if (isatty(fd) > 0)
		return BUFSIZ;
	else if (fstat(fd, stb) < 0)
		return 8*512;	/* conservative in case of DECnet access */
	else
		return 32*512;
}

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

int
ispath(file)
const char *file;
{
	for (; *file; file++) {
		switch (*file) {
		case ':':
		case ']':
		case '>':
		case '/':
			return 1;
		}
	}
	return 0;
}

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

int
isdirpunct(c)
int c;
{
	return (strchr(":]>/", c) != NULL);
}

/* 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;
{
	/* no-op */
}

/* 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_isreadable --- fd can be read from */

int
os_isreadable(const awk_input_buf_t *iobuf, bool *isdir)
{
	*isdir = false;

	switch (iobuf->sbuf.st_mode & S_IFMT) {
	case S_IFREG:
	case S_IFCHR:	/* ttys, /dev/null, .. */
#ifdef S_IFSOCK
	case S_IFSOCK:
#endif
#ifdef S_IFIFO
	case S_IFIFO:
#endif
		return true;
	case S_IFDIR:
		*isdir = true;
		/* fall through */
	default:
		return false;
	}
}

/* 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;
}

/* files_are_same --- deal with VMS struct stat */

int
files_are_same(char *newfile, SRCFILE *oldfile)
{
	struct stat st, *f1, *f2;

	f1 = &st;
	if (stat(newfile, f1) != 0) return 0;

	f2 = &oldfile->sbuf;
		/* compare device string */
	return (strcmp(f1->st_dev, f2->st_dev) == 0
		/* and 48-bit file id cookie stored in 3 short ints */
		&& f1->st_ino[0] == f2->st_ino[0]
		&& f1->st_ino[1] == f2->st_ino[1]
		&& f1->st_ino[2] == f2->st_ino[2]);
}

int
os_isatty(int fd)
{
	return (isatty(fd) > 0);
}

void
init_sockets(void)
{
}