| The Android Open Source Project | a27d2ba | 2008-10-21 07:00:00 -0700 | [diff] [blame^] | 1 | /* $OpenBSD: flags.c,v 1.6 2005/08/08 08:05:36 espie Exp $ */ |
| 2 | /*- |
| 3 | * Copyright (c) 1990, 1993 |
| 4 | * The Regents of the University of California. All rights reserved. |
| 5 | * |
| 6 | * This code is derived from software contributed to Berkeley by |
| 7 | * Chris Torek. |
| 8 | * |
| 9 | * Redistribution and use in source and binary forms, with or without |
| 10 | * modification, are permitted provided that the following conditions |
| 11 | * are met: |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in the |
| 16 | * documentation and/or other materials provided with the distribution. |
| 17 | * 3. Neither the name of the University nor the names of its contributors |
| 18 | * may be used to endorse or promote products derived from this software |
| 19 | * without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 | * SUCH DAMAGE. |
| 32 | */ |
| 33 | |
| 34 | #include <sys/types.h> |
| 35 | #include <sys/file.h> |
| 36 | #include <stdio.h> |
| 37 | #include <errno.h> |
| 38 | #include <fcntl.h> |
| 39 | |
| 40 | /* |
| 41 | * Return the (stdio) flags for a given mode. Store the flags |
| 42 | * to be passed to an open() syscall through *optr. |
| 43 | * Return 0 on error. |
| 44 | */ |
| 45 | int |
| 46 | __sflags(const char *mode, int *optr) |
| 47 | { |
| 48 | int ret, m, o; |
| 49 | |
| 50 | switch (*mode++) { |
| 51 | |
| 52 | case 'r': /* open for reading */ |
| 53 | ret = __SRD; |
| 54 | m = O_RDONLY; |
| 55 | o = 0; |
| 56 | break; |
| 57 | |
| 58 | case 'w': /* open for writing */ |
| 59 | ret = __SWR; |
| 60 | m = O_WRONLY; |
| 61 | o = O_CREAT | O_TRUNC; |
| 62 | break; |
| 63 | |
| 64 | case 'a': /* open for appending */ |
| 65 | ret = __SWR; |
| 66 | m = O_WRONLY; |
| 67 | o = O_CREAT | O_APPEND; |
| 68 | break; |
| 69 | |
| 70 | default: /* illegal mode */ |
| 71 | errno = EINVAL; |
| 72 | return (0); |
| 73 | } |
| 74 | |
| 75 | /* [rwa]\+ or [rwa]b\+ means read and write */ |
| 76 | if (*mode == '+' || (*mode == 'b' && mode[1] == '+')) { |
| 77 | ret = __SRW; |
| 78 | m = O_RDWR; |
| 79 | } |
| 80 | *optr = m | o; |
| 81 | return (ret); |
| 82 | } |