83 lines
2.5 KiB
C
83 lines
2.5 KiB
C
/* $OpenBSD: flags.c,v 1.6 2005/08/08 08:05:36 espie Exp $ */
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/file.h>
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#include <stdio.h>
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#include <errno.h>
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#include <fcntl.h>
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/*
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* Return the (stdio) flags for a given mode. Store the flags
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* to be passed to an open() syscall through *optr.
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* Return 0 on error.
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*/
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int
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__sflags(const char *mode, int *optr)
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{
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int ret, m, o;
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switch (*mode++) {
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case 'r': /* open for reading */
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ret = __SRD;
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m = O_RDONLY;
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o = 0;
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break;
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case 'w': /* open for writing */
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ret = __SWR;
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m = O_WRONLY;
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o = O_CREAT | O_TRUNC;
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break;
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case 'a': /* open for appending */
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ret = __SWR;
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m = O_WRONLY;
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o = O_CREAT | O_APPEND;
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break;
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default: /* illegal mode */
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errno = EINVAL;
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return (0);
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}
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/* [rwa]\+ or [rwa]b\+ means read and write */
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if (*mode == '+' || (*mode == 'b' && mode[1] == '+')) {
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ret = __SRW;
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m = O_RDWR;
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}
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*optr = m | o;
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return (ret);
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}
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