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author | nate <nate@FreeBSD.org> | 1994-11-05 18:49:34 +0000 |
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committer | nate <nate@FreeBSD.org> | 1994-11-05 18:49:34 +0000 |
commit | 1745c06559d8564dfa0b18bc024934cd37855d73 (patch) | |
tree | 7f3f4ff1eb4d79e62ac69689ad16a3d3369fab6d /lib/libc/stdio/fseek.c | |
parent | 330d2baea15968357b4de6dd38aea347086e5234 (diff) | |
download | FreeBSD-src-1745c06559d8564dfa0b18bc024934cd37855d73.zip FreeBSD-src-1745c06559d8564dfa0b18bc024934cd37855d73.tar.gz |
Date: Wed, 26 Oct 1994 15:44:49 -0600
From: Chris Torek <torek@bsdi.com>
Here is a semi-official patch (apply to /usr/src/lib/libc/stdio/fseek.c,
rebuild libc, install). The current code fails when the seek:
- is optimized, and
- is to just past the end of the block currently in the buffer, and
- is followed by another seek with no intervening read operation, and
- the destination of subsequent seek is within the block left in the
buffer (seeking to the beginning of a block does not force a read,
so the buffer still contains the previous block)
so it is indeed rather obscure.
I may have a different `final' fix, as this one `loses' the buffer
contents on a seek that goes just past the end of the current block.
[Footnote: seeks are optimized only on read-only opens of regular
files that are buffered by the file's optimal I/O size. This is
what you get with fopen(path, "r") and no call to setvbuf().]
Obtained from: [ BSDI mailing list ]
Diffstat (limited to 'lib/libc/stdio/fseek.c')
-rw-r--r-- | lib/libc/stdio/fseek.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/libc/stdio/fseek.c b/lib/libc/stdio/fseek.c index 6b0cc8b..9cb04ad 100644 --- a/lib/libc/stdio/fseek.c +++ b/lib/libc/stdio/fseek.c @@ -213,6 +213,7 @@ fseek(fp, offset, whence) if ((*seekfn)(fp->_cookie, curoff, SEEK_SET) == POS_ERR) goto dumb; fp->_r = 0; + fp->_p = fp->_bf._base; if (HASUB(fp)) FREEUB(fp); fp->_flags &= ~__SEOF; |