scoutos / prex-0.9.0 / usr / lib / libc / stdio / flags.c @ 03e9c04a
History | View | Annotate | Download (2.45 KB)
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 |
* 3. 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 |
#include <sys/types.h> |
34 |
#include <sys/fcntl.h> |
35 |
#include <stdio.h> |
36 |
#include <errno.h> |
37 |
|
38 |
/*
|
39 |
* Return the (stdio) flags for a given mode. Store the flags
|
40 |
* to be passed to an open() syscall through *optr.
|
41 |
* Return 0 on error.
|
42 |
*/
|
43 |
int
|
44 |
__sflags(char *mode, int *optr) |
45 |
{ |
46 |
int ret, m, o;
|
47 |
|
48 |
switch (*mode++) {
|
49 |
|
50 |
case 'r': /* open for reading */ |
51 |
ret = __SRD; |
52 |
m = O_RDONLY; |
53 |
o = 0;
|
54 |
break;
|
55 |
|
56 |
case 'w': /* open for writing */ |
57 |
ret = __SWR; |
58 |
m = O_WRONLY; |
59 |
o = O_CREAT | O_TRUNC; |
60 |
break;
|
61 |
|
62 |
case 'a': /* open for appending */ |
63 |
ret = __SWR; |
64 |
m = O_WRONLY; |
65 |
o = O_CREAT | O_APPEND; |
66 |
break;
|
67 |
|
68 |
default: /* illegal mode */ |
69 |
errno = EINVAL; |
70 |
return (0); |
71 |
} |
72 |
|
73 |
/* [rwa]\+ or [rwa]b\+ means read and write */
|
74 |
if (*mode == '+' || (*mode == 'b' && mode[1] == '+')) { |
75 |
ret = __SRW; |
76 |
m = O_RDWR; |
77 |
} |
78 |
*optr = m | o; |
79 |
return (ret);
|
80 |
} |