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Disallow fseek() optimization in internal read buffer, if pointer is moved by

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seek. It means that beginning of read buffer becomes not the same as current
file position.
This commit is contained in:
Andrey A. Chernov 2001-10-23 22:48:00 +00:00
parent 9965784733
commit 751fc77994
1 changed files with 5 additions and 0 deletions
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5
lib/libc/stdio/stdio.c
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@ -164,6 +164,11 @@ _sseek(fp, offset, whence)
errret = errno;
if (errno == 0)
errno = serrno;
if (errret == 0 && (offset != 0 || whence != SEEK_CUR))
/* Disallow fseek() optimization inside read buffer */
fp->_flags |= __SMOD;
/*
* Disallow negative seeks per POSIX.
* It is needed here to help upper level caller