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/* $OpenBSD: flags.c,v 1.8 2014/08/31 02:21:18 guenther 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 "local.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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✓✓✗✗
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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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✓✓ |
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while (*mode != '\0') |
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✓✗✗✓
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switch (*mode++) { |
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case 'b': |
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break; |
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case '+': |
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ret = __SRW; |
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m = O_RDWR; |
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break; |
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case 'e': |
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o |= O_CLOEXEC; |
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break; |
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case 'x': |
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if (o & O_CREAT) |
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o |= O_EXCL; |
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break; |
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default: |
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/* |
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* Lots of software passes other extension mode |
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* letters, like Window's 't' |
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*/ |
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#if 0 |
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errno = EINVAL; |
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return (0); |
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#else |
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break; |
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#endif |
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} |
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*optr = m | o; |
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return (ret); |
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} |