28 lines
1.1 KiB
Diff
28 lines
1.1 KiB
Diff
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commit ecc7c3deb9f347649c2078fcc0f94d4cedf92d60
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Tue Jan 2 14:36:17 2024 +0100
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libio: Check remaining buffer size in _IO_wdo_write (bug 31183)
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The multibyte character needs to fit into the remaining buffer space,
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not the already-written buffer space. Without the fix, we were never
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moving the write pointer from the start of the buffer, always using
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the single-character fallback buffer.
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Fixes commit 04b76b5aa8b2d1d19066e42dd1 ("Don't error out writing
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a multibyte character to an unbuffered stream (bug 17522)").
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diff --git a/libio/wfileops.c b/libio/wfileops.c
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index 37f44780f811bd38..6cbc3c7c968f9136 100644
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--- a/libio/wfileops.c
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+++ b/libio/wfileops.c
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@@ -57,7 +57,7 @@ _IO_wdo_write (FILE *fp, const wchar_t *data, size_t to_do)
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char mb_buf[MB_LEN_MAX];
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char *write_base, *write_ptr, *buf_end;
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- if (fp->_IO_write_ptr - fp->_IO_write_base < sizeof (mb_buf))
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+ if (fp->_IO_buf_end - fp->_IO_write_ptr < sizeof (mb_buf))
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{
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/* Make sure we have room for at least one multibyte
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character. */
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