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| | #include "stdio_impl.h"
#include <stdlib.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include "libc.h"
FILE *__fdopen(int fd, const char *mode)
{
FILE *f;
struct winsize wsz;
/* Check for valid initial mode character */
if (!strchr("rwa", *mode)) {
errno = EINVAL;
return 0;
}
/* Allocate FILE+buffer or fail */
if (!(f=malloc(sizeof *f + UNGET + BUFSIZ))) return 0;
/* Zero-fill only the struct, not the buffer */
memset(f, 0, sizeof *f);
/* Impose mode restrictions */
if (!strchr(mode, '+')) f->flags = (*mode == 'r') ? F_NOWR : F_NORD;
int fd_flag = __syscall(SYS_fcntl, fd, F_GETFL);
if (fd_flag == -1) return 0;
if (((fd_flag & O_ACCMODE) == O_RDONLY && !(f->flags & F_NORD)) ||
((fd_flag & O_ACCMODE) == O_WRONLY && !(f->flags & F_NOWR))) {
errno = EINVAL;
return 0;
}
/* Apply close-on-exec flag */
if (strchr(mode, 'e')) __syscall(SYS_fcntl, fd, F_SETFD, FD_CLOEXEC);
/* Set append mode on fd if opened for append */
if (*mode == 'a') {
int flags = __syscall(SYS_fcntl, fd, F_GETFL);
if (!(flags & O_APPEND))
__syscall(SYS_fcntl, fd, F_SETFL, flags | O_APPEND);
f->flags |= F_APP;
}
f->fd = fd;
f->buf = (unsigned char *)f + sizeof *f + UNGET;
f->buf_size = BUFSIZ;
/* Activate line buffered mode for terminals */
f->lbf = EOF;
if (!(f->flags & F_NOWR) && !__syscall(SYS_ioctl, fd, TIOCGWINSZ, &wsz))
f->lbf = '\n';
/* Initialize op ptrs. No problem if some are unneeded. */
f->read = __stdio_read;
f->write = __stdio_write;
f->seek = __stdio_seek;
f->close = __stdio_close;
if (!libc.threaded) f->lock = -1;
/* Add new FILE to open file list */
return __ofl_add(f);
}
weak_alias(__fdopen, fdopen);
|