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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 | * %sccs.include.redist.c% | |
9 | */ | |
10 | ||
11 | #if defined(LIBC_SCCS) && !defined(lint) | |
12 | static char sccsid[] = "@(#)flags.c 5.1 (Berkeley) %G%"; | |
13 | #endif /* LIBC_SCCS and not lint */ | |
14 | ||
15 | #include <sys/types.h> | |
16 | #include <sys/file.h> | |
17 | #include <stdio.h> | |
18 | #include <errno.h> | |
19 | ||
20 | /* | |
21 | * Return the (stdio) flags for a given mode. Store the flags | |
22 | * to be passed to an open() syscall through *optr. | |
23 | * Return 0 on error. | |
24 | */ | |
25 | __sflags(mode, optr) | |
26 | register char *mode; | |
27 | int *optr; | |
28 | { | |
29 | register int ret, m, o; | |
30 | ||
31 | switch (*mode++) { | |
32 | ||
33 | case 'r': /* open for reading */ | |
34 | ret = __SRD; | |
35 | m = O_RDONLY; | |
36 | o = 0; | |
37 | break; | |
38 | ||
39 | case 'w': /* open for writing */ | |
40 | ret = __SWR; | |
41 | m = O_WRONLY; | |
42 | o = O_CREAT | O_TRUNC; | |
43 | break; | |
44 | ||
45 | case 'a': /* open for appending */ | |
46 | ret = __SWR; | |
47 | m = O_WRONLY; | |
48 | o = O_CREAT | O_APPEND; | |
49 | break; | |
50 | ||
51 | default: /* illegal mode */ | |
52 | errno = EINVAL; | |
53 | return (0); | |
54 | } | |
55 | ||
56 | /* [rwa]\+ or [rwa]b\+ means read and write */ | |
57 | if (*mode == '+' || (*mode == 'b' && mode[1] == '+')) { | |
58 | ret = __SRW; | |
59 | m = O_RDWR; | |
60 | } | |
61 | *optr = m | o; | |
62 | return (ret); | |
63 | } |