/* flags.c - internal routines for flags manipulation. stdio.h *//* Copyright 1992-1993 Wind River Systems, Inc. */ /*modification history--------------------01c,27feb93,smb  added error checking for incorrect modes01b,20sep92,smb  documentation additions01a,29jul92,smb  taken from UCB stdio*/ /*DESCRIPTION * * Copyright (c) 1990 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.INCLUDE FILE: stdio.h, sys/types.h, errno.h, fcntl.hSEE ALSO: American National Standard X3.159-1989NOMANUAL*/#include "vxWorks.h"#include "stdio.h"#include "sys/types.h"#include "errno.h"#include "fcntl.h"/******************************************************************************** __sflags - return flags for a given mode.* * Return the (stdio) flags for a given mode.  Store the flags* to be passed to an open() syscall through *optr.* Return 0 on error.** INCLUDE: stdio.h ** RETURNS: flags or ZERO* NOMANUAL*/int __sflags    (    FAST char *	mode,    int *	optr    )    {    FAST int ret;    FAST int m;    FAST int 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;    /* check for garbage in second character */    if ((*mode != '+') && (*mode != 'b') && (*mode != '\0'))	return (0);    /* check for garbage in third character */    if (*mode++ == '\0') 	return (ret);			/* no third char */    if ((*mode != '+') && (*mode != 'b') && (*mode != '\0'))	return (0);    /* check for garbage in fourth character */    if (*mode++ == '\0') 	return (ret);			/* no fourth char */    if (*mode != '\0')	return (0);    else	return (ret);    }