1 |
|
|
/* $OpenBSD: flags.c,v 1.8 2014/08/31 02:21:18 guenther Exp $ */ |
2 |
|
|
/*- |
3 |
|
|
* Copyright (c) 1990, 1993 |
4 |
|
|
* The Regents of the University of California. All rights reserved. |
5 |
|
|
* |
6 |
|
|
* This code is derived from software contributed to Berkeley by |
7 |
|
|
* Chris Torek. |
8 |
|
|
* |
9 |
|
|
* Redistribution and use in source and binary forms, with or without |
10 |
|
|
* modification, are permitted provided that the following conditions |
11 |
|
|
* are met: |
12 |
|
|
* 1. Redistributions of source code must retain the above copyright |
13 |
|
|
* notice, this list of conditions and the following disclaimer. |
14 |
|
|
* 2. Redistributions in binary form must reproduce the above copyright |
15 |
|
|
* notice, this list of conditions and the following disclaimer in the |
16 |
|
|
* documentation and/or other materials provided with the distribution. |
17 |
|
|
* 3. Neither the name of the University nor the names of its contributors |
18 |
|
|
* may be used to endorse or promote products derived from this software |
19 |
|
|
* without specific prior written permission. |
20 |
|
|
* |
21 |
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
22 |
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
23 |
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
24 |
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
25 |
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
26 |
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
27 |
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
28 |
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
29 |
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
30 |
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
31 |
|
|
* SUCH DAMAGE. |
32 |
|
|
*/ |
33 |
|
|
|
34 |
|
|
#include <sys/types.h> |
35 |
|
|
#include <sys/file.h> |
36 |
|
|
#include <stdio.h> |
37 |
|
|
#include <errno.h> |
38 |
|
|
#include "local.h" |
39 |
|
|
|
40 |
|
|
/* |
41 |
|
|
* Return the (stdio) flags for a given mode. Store the flags |
42 |
|
|
* to be passed to an open() syscall through *optr. |
43 |
|
|
* Return 0 on error. |
44 |
|
|
*/ |
45 |
|
|
int |
46 |
|
|
__sflags(const char *mode, int *optr) |
47 |
|
|
{ |
48 |
|
|
int ret, m, o; |
49 |
|
|
|
50 |
✓✓✗✗
|
8637578 |
switch (*mode++) { |
51 |
|
|
|
52 |
|
|
case 'r': /* open for reading */ |
53 |
|
|
ret = __SRD; |
54 |
|
|
m = O_RDONLY; |
55 |
|
|
o = 0; |
56 |
|
4318558 |
break; |
57 |
|
|
|
58 |
|
|
case 'w': /* open for writing */ |
59 |
|
|
ret = __SWR; |
60 |
|
|
m = O_WRONLY; |
61 |
|
|
o = O_CREAT | O_TRUNC; |
62 |
|
231 |
break; |
63 |
|
|
|
64 |
|
|
case 'a': /* open for appending */ |
65 |
|
|
ret = __SWR; |
66 |
|
|
m = O_WRONLY; |
67 |
|
|
o = O_CREAT | O_APPEND; |
68 |
|
|
break; |
69 |
|
|
|
70 |
|
|
default: /* illegal mode */ |
71 |
|
|
errno = EINVAL; |
72 |
|
|
return (0); |
73 |
|
|
} |
74 |
|
|
|
75 |
✓✓ |
12953849 |
while (*mode != '\0') |
76 |
✓✓✓✗
|
12953311 |
switch (*mode++) { |
77 |
|
|
case 'b': |
78 |
|
|
break; |
79 |
|
|
case '+': |
80 |
|
|
ret = __SRW; |
81 |
|
|
m = O_RDWR; |
82 |
|
4317069 |
break; |
83 |
|
|
case 'e': |
84 |
|
1182 |
o |= O_CLOEXEC; |
85 |
|
1182 |
break; |
86 |
|
|
case 'x': |
87 |
|
|
if (o & O_CREAT) |
88 |
|
|
o |= O_EXCL; |
89 |
|
|
break; |
90 |
|
|
default: |
91 |
|
|
/* |
92 |
|
|
* Lots of software passes other extension mode |
93 |
|
|
* letters, like Window's 't' |
94 |
|
|
*/ |
95 |
|
|
#if 0 |
96 |
|
|
errno = EINVAL; |
97 |
|
|
return (0); |
98 |
|
|
#else |
99 |
|
|
break; |
100 |
|
|
#endif |
101 |
|
|
} |
102 |
|
|
|
103 |
|
4318789 |
*optr = m | o; |
104 |
|
4318789 |
return (ret); |
105 |
|
4318789 |
} |