/* Return a new, zeroed, stream.
You must set its cookie and io_mode.
The first operation will give it a buffer unless you do.
It will also give it the default functions unless you set the `seen' flag.
Returns NULL if a stream can't be created. */
FILE *
__newstream (void)
{
register FILE *stream;
stream = __stdio_head;
while (__validfp (stream))
stream = stream->__next;
if (stream == NULL)
{
/* None to reuse. */
stream = (FILE *) malloc (sizeof (FILE));
if (stream == NULL)
return NULL;
stream->__next = __stdio_head;
__stdio_head = stream;
}
__invalidate (stream);
stream->__magic = _IOMAGIC;
stream->__offset = (fpos_t) -1;
stream->__target = (fpos_t) -1;
stream->__flags = 0;
return stream;
}
int fseek(FILE* fp, long int offset, int whence)
{
if (!__validfp(fp)) {
errno = EBADF;
return EOF;
}
return (((streambuf*)fp)->seekoff(offset, (_seek_dir)whence) == EOF)
? EOF : 0;
}
extern "C" char* fgets(char* s, int n, FILE* stream)
{
if (!__validfp(stream))
return NULL;
long len = ((streambuf*)stream)->sgetline(s, n, '\n', 1);
if (len <= 0)
return NULL;
return s;
}
/* Close a stream. */
int
__fcloseall ()
{
/* Close all streams. */
register FILE *f;
for (f = __stdio_head; f != NULL; f = f->__next)
if (__validfp(f))
(void) fclose(f);
return 0;
}
extern "C" int ferror(FILE* fp)
{
if (!__validfp(fp))
return EOF;
return (fp->_flags & _S_ERR_SEEN) != 0;
}
