| 1 | /*-␊ |
| 2 | * Copyright (c) 1990, 1993␊ |
| 3 | *␉The Regents of the University of California. All rights reserved.␊ |
| 4 | *␊ |
| 5 | * This code is derived from software contributed to Berkeley by␊ |
| 6 | * Chris Torek.␊ |
| 7 | *␊ |
| 8 | * Redistribution and use in source and binary forms, with or without␊ |
| 9 | * modification, are permitted provided that the following conditions␊ |
| 10 | * are met:␊ |
| 11 | * 1. Redistributions of source code must retain the above copyright␊ |
| 12 | * notice, this list of conditions and the following disclaimer.␊ |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright␊ |
| 14 | * notice, this list of conditions and the following disclaimer in the␊ |
| 15 | * documentation and/or other materials provided with the distribution.␊ |
| 16 | * 4. Neither the name of the University nor the names of its contributors␊ |
| 17 | * may be used to endorse or promote products derived from this software␊ |
| 18 | * without specific prior written permission.␊ |
| 19 | *␊ |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND␊ |
| 21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE␊ |
| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE␊ |
| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE␊ |
| 24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL␊ |
| 25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS␊ |
| 26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)␊ |
| 27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT␊ |
| 28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY␊ |
| 29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF␊ |
| 30 | * SUCH DAMAGE.␊ |
| 31 | */␊ |
| 32 | ␊ |
| 33 | #if defined(LIBC_SCCS) && !defined(lint)␊ |
| 34 | static char sccsid[] = "@(#)flags.c␉8.1 (Berkeley) 6/4/93";␊ |
| 35 | #endif /* LIBC_SCCS and not lint */␊ |
| 36 | #include <sys/cdefs.h>␊ |
| 37 | __FBSDID("$FreeBSD: src/lib/libc/stdio/flags.c,v 1.10 2007/01/09 00:28:06 imp Exp $");␊ |
| 38 | ␊ |
| 39 | #include <sys/types.h>␊ |
| 40 | #include <sys/file.h>␊ |
| 41 | #include <stdio.h>␊ |
| 42 | #include <errno.h>␊ |
| 43 | ␊ |
| 44 | #include "local.h"␊ |
| 45 | ␊ |
| 46 | /*␊ |
| 47 | * Return the (stdio) flags for a given mode. Store the flags␊ |
| 48 | * to be passed to an _open() syscall through *optr.␊ |
| 49 | * Return 0 on error.␊ |
| 50 | */␊ |
| 51 | int␊ |
| 52 | __sflags(mode, optr)␊ |
| 53 | ␉const char *mode;␊ |
| 54 | ␉int *optr;␊ |
| 55 | {␊ |
| 56 | ␉int ret, m, o;␊ |
| 57 | ␊ |
| 58 | ␉switch (*mode++) {␊ |
| 59 | ␊ |
| 60 | ␉case 'r':␉/* open for reading */␊ |
| 61 | ␉␉ret = __SRD;␊ |
| 62 | ␉␉m = O_RDONLY;␊ |
| 63 | ␉␉o = 0;␊ |
| 64 | ␉␉break;␊ |
| 65 | ␊ |
| 66 | ␉case 'w':␉/* open for writing */␊ |
| 67 | ␉␉ret = __SWR;␊ |
| 68 | ␉␉m = O_WRONLY;␊ |
| 69 | ␉␉o = O_CREAT | O_TRUNC;␊ |
| 70 | ␉␉break;␊ |
| 71 | ␊ |
| 72 | ␉case 'a':␉/* open for appending */␊ |
| 73 | ␉␉ret = __SWR;␊ |
| 74 | ␉␉m = O_WRONLY;␊ |
| 75 | ␉␉o = O_CREAT | O_APPEND;␊ |
| 76 | ␉␉break;␊ |
| 77 | ␊ |
| 78 | ␉default:␉/* illegal mode */␊ |
| 79 | ␉␉errno = EINVAL;␊ |
| 80 | ␉␉return (0);␊ |
| 81 | ␉}␊ |
| 82 | ␊ |
| 83 | ␉/* [rwa]\+ or [rwa]b\+ means read and write */␊ |
| 84 | ␉if (*mode == 'b')␊ |
| 85 | ␉␉mode++;␊ |
| 86 | ␉if (*mode == '+') {␊ |
| 87 | ␉␉ret = __SRW;␊ |
| 88 | ␉␉m = O_RDWR;␊ |
| 89 | ␉␉mode++;␊ |
| 90 | ␉␉if (*mode == 'b')␊ |
| 91 | ␉␉␉mode++;␊ |
| 92 | ␉}␊ |
| 93 | ␉if (*mode == 'x')␊ |
| 94 | ␉␉o |= O_EXCL;␊ |
| 95 | ␉*optr = m | o;␊ |
| 96 | ␉return (ret);␊ |
| 97 | }␊ |
| 98 | |
