1#include "stdio_impl.h"
 2#include <stdlib.h>
 3#include <sys/ioctl.h>
 4#include <fcntl.h>
 5#include <errno.h>
 6#include <string.h>
 7#include "libc.h"
 8
 9FILE *__fdopen(int fd, const char *mode)
10{
11	FILE *f;
12	struct winsize wsz;
13
14	/* Check for valid initial mode character */
15	if (!strchr("rwa", *mode)) {
16		errno = EINVAL;
17		return 0;
18	}
19
20	/* Allocate FILE+buffer or fail */
21	if (!(f=malloc(sizeof *f + UNGET + BUFSIZ))) return 0;
22
23	/* Zero-fill only the struct, not the buffer */
24	memset(f, 0, sizeof *f);
25
26	/* Impose mode restrictions */
27	if (!strchr(mode, '+')) f->flags = (*mode == 'r') ? F_NOWR : F_NORD;
28
29	/* Apply close-on-exec flag */
30	if (strchr(mode, 'e')) __syscall(SYS_fcntl, fd, F_SETFD, FD_CLOEXEC);
31
32	/* Set append mode on fd if opened for append */
33	if (*mode == 'a') {
34		int flags = __syscall(SYS_fcntl, fd, F_GETFL);
35		if (!(flags & O_APPEND))
36			__syscall(SYS_fcntl, fd, F_SETFL, flags | O_APPEND);
37		f->flags |= F_APP;
38	}
39
40	f->fd = fd;
41	f->buf = (unsigned char *)f + sizeof *f + UNGET;
42	f->buf_size = BUFSIZ;
43
44	/* Activate line buffered mode for terminals */
45	f->lbf = EOF;
46	if (!(f->flags & F_NOWR) && !__syscall(SYS_ioctl, fd, TIOCGWINSZ, &wsz))
47		f->lbf = '\n';
48
49	/* Initialize op ptrs. No problem if some are unneeded. */
50	f->read = __stdio_read;
51	f->write = __stdio_write;
52	f->seek = __stdio_seek;
53	f->close = __stdio_close;
54
55	if (!libc.threaded) f->lock = -1;
56
57	/* Add new FILE to open file list */
58	return __ofl_add(f);
59}
60
61weak_alias(__fdopen, fdopen);