projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 8f953e65 CP |
1 | /*- |
| 2 | * Copyright (c) 1990 The Regents of the University of California. | |
| 3 | * 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 | * 3. All advertising materials mentioning features or use of this software | |
| 17 | * must display the following acknowledgement: | |
| 18 | * This product includes software developed by the University of | |
| 19 | * California, Berkeley and its contributors. | |
| 20 | * 4. Neither the name of the University nor the names of its contributors | |
| 21 | * may be used to endorse or promote products derived from this software | |
| 22 | * without specific prior written permission. | |
| 23 | * | |
| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 34 | * SUCH DAMAGE. | |
| 35 | */ | |
| 36 | ||
| 37 | #if defined(LIBC_SCCS) && !defined(lint) | |
| 38 | /*static char *sccsid = "from: @(#)flags.c 5.1 (Berkeley) 1/20/91";*/ | |
| 39 | static char *rcsid = "$Id: flags.c,v 1.15 1994/01/27 06:08:30 proven Exp $"; | |
| 40 | #endif /* LIBC_SCCS and not lint */ | |
| 41 | ||
| 42 | #include <sys/types.h> | |
| 43 | #include <sys/file.h> | |
| 44 | #include <stdio.h> | |
| 45 | #include <errno.h> | |
| 46 | ||
| 47 | /* | |
| 48 | * Return the (stdio) flags for a given mode. Store the flags | |
| 49 | * to be passed to an open() syscall through *optr. | |
| 50 | * Return 0 on error. | |
| 51 | */ | |
| 52 | __sflags(mode, optr) | |
| 53 | register char *mode; | |
| 54 | int *optr; | |
| 55 | { | |
| 56 | register 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 == '+' || (*mode == 'b' && mode[1] == '+')) { | |
| 85 | ret = __SRW; | |
| 86 | m = O_RDWR; | |
| 87 | } | |
| 88 | *optr = m | o; | |
| 89 | return (ret); | |
| 90 | } |