char *
__fgets_chk (char *buf, size_t size, int n, _IO_FILE *fp)
{
_IO_size_t count;
char *result;
CHECK_FILE (fp, NULL);
if (n <= 0)
return NULL;
_IO_acquire_lock (fp);
/* This is very tricky since a file descriptor may be in the
non-blocking mode. The error flag doesn't mean much in this
case. We return an error only when there is a new error. */
int old_error = fp->_IO_file_flags & _IO_ERR_SEEN;
fp->_IO_file_flags &= ~_IO_ERR_SEEN;
count = _IO_getline (fp, buf, MIN ((size_t) n - 1, size), '\n', 1);
/* If we read in some bytes and errno is EAGAIN, that error will
be reported for next read. */
if (count == 0 || ((fp->_IO_file_flags & _IO_ERR_SEEN)
&& errno != EAGAIN))
result = NULL;
else if (count >= size)
__chk_fail ();
else
{
buf[count] = '\0';
result = buf;
}
fp->_IO_file_flags |= old_error;
_IO_release_lock (fp);
return result;
}
char *
__gets_chk (char *buf, size_t size)
{
size_t count;
int ch;
char *retval;
if (size == 0)
__chk_fail ();
_IO_acquire_lock (stdin);
ch = _IO_getc_unlocked (stdin);
if (ch == EOF)
{
retval = NULL;
goto unlock_return;
}
if (ch == '\n')
count = 0;
else
{
/* This is very tricky since a file descriptor may be in the
non-blocking mode. The error flag doesn't mean much in this
case. We return an error only when there is a new error. */
int old_error = stdin->_flags & _IO_ERR_SEEN;
stdin->_flags &= ~_IO_ERR_SEEN;
buf[0] = (char) ch;
count = _IO_getline (stdin, buf + 1, size - 1, '\n', 0) + 1;
if (stdin->_flags & _IO_ERR_SEEN)
{
retval = NULL;
goto unlock_return;
}
else
stdin->_flags |= old_error;
}
if (count >= size)
__chk_fail ();
buf[count] = 0;
retval = buf;
unlock_return:
_IO_release_lock (stdin);
return retval;
}
char *
_IO_gets (char *buf)
{
_IO_size_t count;
int ch;
char *retval;
_IO_acquire_lock (_IO_stdin);
ch = _IO_getc_unlocked (_IO_stdin);
if (ch == EOF)
{
retval = NULL;
goto unlock_return;
}
if (ch == '\n')
count = 0;
else
{
/* This is very tricky since a file descriptor may be in the
non-blocking mode. The error flag doesn't mean much in this
case. We return an error only when there is a new error. */
int old_error = _IO_stdin->_IO_file_flags & _IO_ERR_SEEN;
_IO_stdin->_IO_file_flags &= ~_IO_ERR_SEEN;
buf[0] = (char) ch;
count = _IO_getline (_IO_stdin, buf + 1, INT_MAX, '\n', 0) + 1;
if (_IO_stdin->_IO_file_flags & _IO_ERR_SEEN)
{
retval = NULL;
goto unlock_return;
}
else
_IO_stdin->_IO_file_flags |= old_error;
}
buf[count] = 0;
retval = buf;
unlock_return:
_IO_release_lock (_IO_stdin);
return retval;
}
char *
_IO_fgets (char *buf, int n, FILE *fp)
{
size_t count;
char *result;
int old_error;
CHECK_FILE (fp, NULL);
if (n <= 0)
return NULL;
if (__glibc_unlikely (n == 1))
{
/* Another irregular case: since we have to store a NUL byte and
there is only room for exactly one byte, we don't have to
read anything. */
buf[0] = '\0';
return buf;
}
_IO_acquire_lock (fp);
/* This is very tricky since a file descriptor may be in the
non-blocking mode. The error flag doesn't mean much in this
case. We return an error only when there is a new error. */
old_error = fp->_flags & _IO_ERR_SEEN;
fp->_flags &= ~_IO_ERR_SEEN;
count = _IO_getline (fp, buf, n - 1, '\n', 1);
/* If we read in some bytes and errno is EAGAIN, that error will
be reported for next read. */
if (count == 0 || ((fp->_flags & _IO_ERR_SEEN) && errno != EAGAIN))
result = NULL;
else
{
buf[count] = '\0';
result = buf;
}
fp->_flags |= old_error;
_IO_release_lock (fp);
return result;
}
