wchar_t *
__fgetws_chk (wchar_t *buf, size_t size, int n, _IO_FILE *fp)
{
_IO_size_t count;
wchar_t *result;
int old_error;
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. */
old_error = fp->_IO_file_flags & _IO_ERR_SEEN;
fp->_IO_file_flags &= ~_IO_ERR_SEEN;
count = _IO_getwline (fp, buf, MIN ((size_t) n - 1, size), L'\n', 1);
/* If we read in some bytes and errno is EAGAIN, that error will
be reported for next read. */
if (count == 0 || (_IO_ferror_unlocked (fp) && 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;
}
/* Print a line on stderr consisting of the text in S, a colon, a space,
a message describing the meaning of the contents of `errno' and a newline.
If S is NULL or "", the colon and space are omitted. */
void
perror (const char *s)
{
int errnum = errno;
FILE *fp;
int fd = -1;
/* The standard says that 'perror' must not change the orientation
of the stream. What is supposed to happen when the stream isn't
oriented yet? In this case we'll create a new stream which is
using the same underlying file descriptor. */
if (__builtin_expect (_IO_fwide (stderr, 0) != 0, 1)
|| (fd = fileno (stderr)) == -1
|| (fd = __dup (fd)) == -1
|| (fp = fdopen (fd, "w+")) == NULL)
{
if (__glibc_unlikely (fd != -1))
__close (fd);
/* Use standard error as is. */
perror_internal (stderr, s, errnum);
}
else
{
/* We don't have to do any special hacks regarding the file
position. Since the stderr stream wasn't used so far we just
write to the descriptor. */
perror_internal (fp, s, errnum);
if (_IO_ferror_unlocked (fp))
stderr->_flags |= _IO_ERR_SEEN;
/* Close the stream. */
fclose (fp);
}
}
wchar_t *
fgetws (wchar_t *buf, int n, _IO_FILE *fp)
{
_IO_size_t count;
wchar_t *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] = L'\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->_IO_file_flags & _IO_ERR_SEEN;
fp->_IO_file_flags &= ~_IO_ERR_SEEN;
count = _IO_getwline (fp, buf, n - 1, L'\n', 1);
/* If we read in some bytes and errno is EAGAIN, that error will
be reported for next read. */
if (count == 0 || (_IO_ferror_unlocked (fp) && errno != EAGAIN))
result = NULL;
else
{
buf[count] = '\0';
result = buf;
}
fp->_IO_file_flags |= old_error;
_IO_release_lock (fp);
return result;
}
int
__ferror_unlocked (FILE *fp)
{
CHECK_FILE (fp, EOF);
return _IO_ferror_unlocked (fp);
}
_IO_ssize_t
_IO_getdelim(char **lineptr, _IO_size_t *n, int delimiter, _IO_FILE *fp)
{
_IO_ssize_t result;
_IO_ssize_t cur_len = 0;
_IO_ssize_t len;
if (lineptr == NULL || n == NULL)
{
MAYBE_SET_EINVAL;
return -1;
}
CHECK_FILE (fp, -1);
_IO_acquire_lock(fp);
if (_IO_ferror_unlocked(fp))
{
result = -1;
goto unlock_return;
}
if (*lineptr == NULL || *n == 0)
{
*n = 120;
*lineptr = (char *) malloc(*n);
if (*lineptr == NULL)
{
result = -1;
goto unlock_return;
}
}
len = fp->_IO_read_end - fp->_IO_read_ptr;
if (len <= 0)
{
if (__underflow(fp) == EOF)
{
result = -1;
goto unlock_return;
}
len = fp->_IO_read_end - fp->_IO_read_ptr;
}
for (;;)
{
_IO_size_t needed;
char *t;
t = (char *) memchr((void *) fp->_IO_read_ptr, delimiter, len);
if (t != NULL)
len = (t - fp->_IO_read_ptr) + 1;
if (__glibc_unlikely(len >= SSIZE_MAX - cur_len))
{
__set_errno(EOVERFLOW);
result = -1;
goto unlock_return;
}
/* Make enough space for len+1 (for final NUL) bytes. */
needed = cur_len + len + 1;
if (needed > *n)
{
char *new_lineptr;
if (needed < 2 * *n)
needed = 2 * *n; /* Be generous. */
new_lineptr = (char *) realloc(*lineptr, needed);
if (new_lineptr == NULL)
{
result = -1;
goto unlock_return;
}
*lineptr = new_lineptr;
*n = needed;
}
memcpy(*lineptr + cur_len, (void *) fp->_IO_read_ptr, len);
fp->_IO_read_ptr += len;
cur_len += len;
if (t != NULL || __underflow(fp) == EOF)
break;
len = fp->_IO_read_end - fp->_IO_read_ptr;
}
(*lineptr)[cur_len] = '\0';
result = cur_len;
unlock_return:
_IO_release_lock(fp);
return result;
}