/*- * Copyright (c) 1990, 1993 *	The Regents of the University of California.  All rights reserved. * * This code is derived from software contributed to Berkeley by * Chris Torek. * * 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 rcsid[] = "$OpenBSD: flags.c,v 1.3 1996/08/19 08:32:37 tholo Exp $";#endif /* LIBC_SCCS and not lint */ #include <sys/types.h>#include <sys/file.h>#include <stdio.h>#include <fcntl.h>#include <errno.h> /* * Return the (stdio) flags for a given mode.  Store the flags * to be passed to an open() syscall through *optr. * Return 0 on error. */int__sflags(mode, optr)	register const char *mode;	int *optr;{	register int ret, m, o; 	switch (*mode++) { 	case 'r':	/* open for reading */		ret = __SRD;		m = O_RDONLY;		o = 0;		break; 	case 'w':	/* open for writing */		ret = __SWR;		m = O_WRONLY;		o = O_CREAT | O_TRUNC;		break; 	case 'a':	/* open for appending */		ret = __SWR;		m = O_WRONLY;		o = O_CREAT | O_APPEND;		break; 	default:	/* illegal mode */		errno = EINVAL;		return (0);	} 	/* [rwa]\+ or [rwa]b\+ means read and write */	if (*mode == '+' || (*mode == 'b' && mode[1] == '+')) {		ret = __SRW;		m = O_RDWR;	}	*optr = m | o;	return (ret);}