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fread: improve performance for unbuffered reads

Description

fread: improve performance for unbuffered reads

We can use the buffer passed to fread(3) directly in the FILE *.
The buffer needs to be reset before each call to __srefill().
This preserves the expected behavior in all cases.

The change was found originally in OpenBSD and later adopted by NetBSD.

MFC after: 2 weeks
Obtained from: OpenBSD (CVS 1.18)

Differential Revision: https://reviews.freebsd.org/D30548

Details

Provenance
pfgAuthored on May 31 2021, 1:48 AM
Differential Revision
D30548: fread: improve performance for unbuffered reads
Parents
R10:934e10b4a388: libcasper: fix descriptors numbers
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