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authorUlrich Drepper <drepper@redhat.com>2009-02-04 21:27:48 +0000
committerUlrich Drepper <drepper@redhat.com>2009-02-04 21:27:48 +0000
commit82f2e9c6bd8a02b6b5d90239f0f683407a5a7d10 (patch)
treee879e05fdd52793265dfdf8e6e4b7e27a1e84965 /libio/wfileops.c
parent3d44c0b219bbe042bd517942e6eaad68145e3440 (diff)
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2009-02-04 Ulrich Drepper <drepper@redhat.com>cvs/fedora-glibc-20090204T2135
* libio/wfileops.c (_IO_wfile_underflow): Fix handling of incomplete characters at end of input buffer. * libio/Makefile (tests): Add tst-fgetwc. * libio/tst-fgetwc.c: New file. * libio/tst-fgetwc.input: New file.
Diffstat (limited to 'libio/wfileops.c')
-rw-r--r--libio/wfileops.c48
1 files changed, 37 insertions, 11 deletions
diff --git a/libio/wfileops.c b/libio/wfileops.c
index b930aad..c5f0eaf 100644
--- a/libio/wfileops.c
+++ b/libio/wfileops.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1993,1995,1997-2003,2004, 2006 Free Software Foundation, Inc.
+/* Copyright (C) 1993,1995,1997-2004,2006,2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Written by Ulrich Drepper <drepper@cygnus.com>.
Based on the single byte version by Per Bothner <bothner@cygnus.com>.
@@ -123,8 +123,6 @@ _IO_wfile_underflow (fp)
struct _IO_codecvt *cd;
enum __codecvt_result status;
_IO_ssize_t count;
- int tries;
- const char *read_ptr_copy;
if (__builtin_expect (fp->_flags & _IO_NO_READS, 0))
{
@@ -236,13 +234,15 @@ _IO_wfile_underflow (fp)
fp->_wide_data->_IO_write_base = fp->_wide_data->_IO_write_ptr =
fp->_wide_data->_IO_write_end = fp->_wide_data->_IO_buf_base;
- tries = 0;
+ const char *read_ptr_copy;
+ char accbuf[MB_LEN_MAX];
+ size_t naccbuf = 0;
again:
count = _IO_SYSREAD (fp, fp->_IO_read_end,
fp->_IO_buf_end - fp->_IO_read_end);
if (count <= 0)
{
- if (count == 0 && tries == 0)
+ if (count == 0 && naccbuf == 0)
fp->_flags |= _IO_EOF_SEEN;
else
fp->_flags |= _IO_ERR_SEEN, count = 0;
@@ -250,7 +250,7 @@ _IO_wfile_underflow (fp)
fp->_IO_read_end += count;
if (count == 0)
{
- if (tries != 0)
+ if (naccbuf != 0)
/* There are some bytes in the external buffer but they don't
convert to anything. */
__set_errno (EILSEQ);
@@ -262,18 +262,31 @@ _IO_wfile_underflow (fp)
/* Now convert the read input. */
fp->_wide_data->_IO_last_state = fp->_wide_data->_IO_state;
fp->_IO_read_base = fp->_IO_read_ptr;
+ const char *from = fp->_IO_read_ptr;
+ const char *to = fp->_IO_read_end;
+ size_t to_copy = count;
+ if (__builtin_expect (naccbuf != 0, 0))
+ {
+ to_copy = MIN (sizeof (accbuf) - naccbuf, count);
+ to = __mempcpy (&accbuf[naccbuf], from, to_copy);
+ naccbuf += to_copy;
+ from = accbuf;
+ }
status = (*cd->__codecvt_do_in) (cd, &fp->_wide_data->_IO_state,
- fp->_IO_read_ptr, fp->_IO_read_end,
- &read_ptr_copy,
+ from, to, &read_ptr_copy,
fp->_wide_data->_IO_read_end,
fp->_wide_data->_IO_buf_end,
&fp->_wide_data->_IO_read_end);
- fp->_IO_read_ptr = (char *) read_ptr_copy;
+ if (__builtin_expect (naccbuf != 0, 0))
+ fp->_IO_read_ptr += MAX (0, read_ptr_copy - &accbuf[naccbuf - to_copy]);
+ else
+ fp->_IO_read_ptr = (char *) read_ptr_copy;
if (fp->_wide_data->_IO_read_end == fp->_wide_data->_IO_buf_base)
{
- if (status == __codecvt_error || fp->_IO_read_end == fp->_IO_buf_end)
+ if (status == __codecvt_error)
{
+ out_eilseq:
__set_errno (EILSEQ);
fp->_flags |= _IO_ERR_SEEN;
return WEOF;
@@ -281,7 +294,20 @@ _IO_wfile_underflow (fp)
/* The read bytes make no complete character. Try reading again. */
assert (status == __codecvt_partial);
- ++tries;
+
+ if (naccbuf == 0)
+ {
+ naccbuf = fp->_IO_read_end - fp->_IO_read_ptr;
+ if (naccbuf >= sizeof (accbuf))
+ goto out_eilseq;
+
+ memcpy (accbuf, fp->_IO_read_ptr, naccbuf);
+ }
+ else if (naccbuf == sizeof (accbuf))
+ goto out_eilseq;
+
+ fp->_IO_read_ptr = fp->_IO_read_end = fp->_IO_read_base;
+
goto again;
}