110 lines
2.9 KiB
C
110 lines
2.9 KiB
C
/*-
|
|
* 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.
|
|
* 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 sccsid[] = "@(#)flags.c 8.1 (Berkeley) 6/4/93";
|
|
#endif /* LIBC_SCCS and not lint */
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/file.h>
|
|
#include <stdio.h>
|
|
#include <errno.h>
|
|
|
|
#include "local.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)
|
|
const char *mode;
|
|
int *optr;
|
|
{
|
|
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);
|
|
}
|
|
|
|
/* 'b' (binary) is ignored */
|
|
if (*mode == 'b')
|
|
mode++;
|
|
|
|
/* [rwa][b]\+ means read and write */
|
|
if (*mode == '+') {
|
|
mode++;
|
|
ret = __SRW;
|
|
m = O_RDWR;
|
|
}
|
|
|
|
/* 'b' (binary) can appear here, too -- and is ignored again */
|
|
if (*mode == 'b')
|
|
mode++;
|
|
|
|
/* 'x' means exclusive (fail if the file exists) */
|
|
if (*mode == 'x') {
|
|
if (m == O_RDONLY) {
|
|
errno = EINVAL;
|
|
return (0);
|
|
}
|
|
o |= O_EXCL;
|
|
}
|
|
|
|
*optr = m | o;
|
|
return (ret);
|
|
}
|