1 /*
2 * Copyright (c) 1990 Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms are permitted
6 * provided that the above copyright notice and this paragraph are
7 * duplicated in all such forms and that any documentation,
8 * and/or other materials related to such
9 * distribution and use acknowledge that the software was developed
10 * by the University of California, Berkeley. The name of the
11 * University may not be used to endorse or promote products derived
12 * from this software without specific prior written permission.
13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
16 */
17 /* No user fns here. Pesch 15apr92 */
18
19 #include <sys/types.h>
20 #include <sys/stat.h>
21 #include <fcntl.h>
22 #include <errno.h>
23 #include "stdio_private.h"
24
25 /*
26 * Return the (stdio) flags for a given mode. Store the flags
27 * to be passed to an open() syscall through *optr.
28 * Return 0 on error.
29 */
30
31 int
__posix_sflags(const char * mode,int * optr)32 __posix_sflags (const char *mode, int *optr)
33 {
34 int ret, m, o;
35
36 switch (mode[0])
37 {
38 case 'r': /* open for reading */
39 ret = __SRD;
40 m = O_RDONLY;
41 o = 0;
42 break;
43
44 case 'w': /* open for writing */
45 ret = __SWR;
46 m = O_WRONLY;
47 o = O_CREAT | O_TRUNC;
48 break;
49
50 case 'a': /* open for appending */
51 ret = __SWR;
52 m = O_WRONLY;
53 o = O_CREAT | O_APPEND;
54 break;
55 default: /* illegal mode */
56 errno = EINVAL;
57 return (0);
58 }
59 while (*++mode)
60 {
61 switch (*mode)
62 {
63 case '+':
64 ret |= (__SRD | __SWR);
65 m = (m & ~O_ACCMODE) | O_RDWR;
66 break;
67 default:
68 break;
69 }
70 }
71 *optr = m | o;
72 return ret;
73 }
74
