| /*- |
| * 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') { |
| mode++; |
| if (m == O_RDONLY) { |
| errno = EINVAL; |
| return (0); |
| } |
| o |= O_EXCL; |
| } |
| |
| /* set close-on-exec */ |
| if (*mode == 'e') |
| o |= O_CLOEXEC; |
| |
| *optr = m | o; |
| return (ret); |
| } |