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
|
#include "__stdio.h" // for __FILE, __libc_fadd
#include "features.h" // for __weak
#include "stddef.h" // for NULL
#include <errno.h> // for EINVAL, errno
#include <fcntl.h> // for O_WRONLY, O_CREAT, O_RDONLY, O_APPEND, O_RDWR
#include <stdio.h> // for FILE, _IOFBF, fmemopen, size_t
#include <stdlib.h> // for calloc, free
#include <string.h> // for strchr
__weak void __stdio_cleanup(void)
{
}
FILE *fmemopen(void *restrict buf, size_t max_size, const char *restrict mode)
{
int flags;
FILE *stream = calloc(1, sizeof(FILE));
if (stream == NULL)
return stream;
__FILE(stream)->fd = -1;
__FILE(stream)->buf = buf;
__FILE(stream)->buf_size = max_size;
__FILE(stream)->type = _IOFBF;
if (mode[0] == 'r') {
flags = O_RDONLY;
} else if (mode[0] == 'w') {
flags = O_WRONLY | O_CREAT | O_TRUNC;
} else if (mode[0] == 'a') {
flags = O_WRONLY | O_CREAT | O_APPEND;
} else {
free(stream);
errno = EINVAL;
return NULL;
}
if (strchr(mode, '+')) {
flags = (flags & ~(O_RDONLY | O_WRONLY)) | O_RDWR;
}
__FILE(stream)->flags = flags;
__libc_fadd(stream);
return stream;
}
|
