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#ifdef __wasilibc_unmodified_upstream // WASI has no syscall
9#else
10#include <__function___isatty.h>
11#endif
12
13FILE *__fdopen(int fd, const char *mode)
14{
15 FILE *f;
16#ifdef __wasilibc_unmodified_upstream // WASI has no syscall
17 struct winsize wsz;
18#endif
19
20 /* Check for valid initial mode character */
21 if (!strchr("rwa", *mode)) {
22 errno = EINVAL;
23 return 0;
24 }
25
26 /* Allocate FILE+buffer or fail */
27 if (!(f=malloc(sizeof *f + UNGET + BUFSIZ))) return 0;
28
29 /* Zero-fill only the struct, not the buffer */
30 memset(f, 0, sizeof *f);
31
32 /* Impose mode restrictions */
33 if (!strchr(mode, '+')) f->flags = (*mode == 'r') ? F_NOWR : F_NORD;
34
35 /* Apply close-on-exec flag */
36#ifdef __wasilibc_unmodified_upstream // WASI has no syscall
37 if (strchr(mode, 'e')) __syscall(SYS_fcntl, fd, F_SETFD, FD_CLOEXEC);
38#else
39 if (strchr(mode, 'e')) fcntl(fd, F_SETFD, FD_CLOEXEC);
40#endif
41
42 /* Set append mode on fd if opened for append */
43 if (*mode == 'a') {
44#ifdef __wasilibc_unmodified_upstream // WASI has no syscall
45 int flags = __syscall(SYS_fcntl, fd, F_GETFL);
46#else
47 int flags = fcntl(fd, F_GETFL);
48#endif
49 if (!(flags & O_APPEND))
50#ifdef __wasilibc_unmodified_upstream // WASI has no syscall
51 __syscall(SYS_fcntl, fd, F_SETFL, flags | O_APPEND);
52#else
53 fcntl(fd, F_SETFL, flags | O_APPEND);
54#endif
55 f->flags |= F_APP;
56 }
57
58 f->fd = fd;
59 f->buf = (unsigned char *)f + sizeof *f + UNGET;
60 f->buf_size = BUFSIZ;
61
62 /* Activate line buffered mode for terminals */
63 f->lbf = EOF;
64#ifdef __wasilibc_unmodified_upstream // WASI has no syscall
65 if (!(f->flags & F_NOWR) && !__syscall(SYS_ioctl, fd, TIOCGWINSZ, &wsz))
66#else
67 if (!(f->flags & F_NOWR) && __isatty(fd))
68#endif
69 f->lbf = '\n';
70
71 /* Initialize op ptrs. No problem if some are unneeded. */
72 f->read = __stdio_read;
73 f->write = __stdio_write;
74 f->seek = __stdio_seek;
75 f->close = __stdio_close;
76
77#if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT)
78 if (!libc.threaded) f->lock = -1;
79#endif
80
81 /* Add new FILE to open file list */
82 return __ofl_add(f);
83}
84
85weak_alias(__fdopen, fdopen);