blob: cf098dfdd1dad083e6b25714ef88258a0214c7b8 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
/*
* fopen.c
*/
#include "stdioint.h"
static int __parse_open_mode(const char *mode)
{
int rwflags = O_RDONLY;
int crflags = 0;
int eflags = 0;
while (*mode) {
switch (*mode++) {
case 'r':
rwflags = O_RDONLY;
crflags = 0;
break;
case 'w':
rwflags = O_WRONLY;
crflags = O_CREAT | O_TRUNC;
break;
case 'a':
rwflags = O_WRONLY;
crflags = O_CREAT | O_APPEND;
break;
case 'e':
eflags |= O_CLOEXEC;
break;
case 'x':
eflags |= O_EXCL;
break;
case '+':
rwflags = O_RDWR;
break;
}
}
return rwflags | crflags | eflags;
}
FILE *fopen(const char *file, const char *mode)
{
int flags = __parse_open_mode(mode);
int fd, err;
FILE *f;
fd = open(file, flags, 0666);
if (fd < 0)
return NULL;
f = fdopen(fd, mode);
if (!f) {
err = errno;
close(fd);
errno = err;
}
return f;
}
|
