10564b1175
groff 1.23.0 added .MR to its -man macro package. The NEWS file states
that the inclusion of the macro "was prompted by its introduction to
Plan 9 from User Space's troff in August 2020." From d32deab it seems
that the name for Plan 9 from User Space's implementation was suggested
by groff maintainer G. Brandon Robinson.
Not sure if the intention was to make these definitions compatible, but
it would be nice if they were.
Currently, Plan 9 from User Space's .MR expects its second argument to
be parenthesized. groff's .MR does not. This results in extra
parentheses appearing in manual references when viewing Plan 9 from User
Space's manual pages on a system using groff.
57 lines
1.0 KiB
Groff
57 lines
1.0 KiB
Groff
.TH VENTI-ZERO 3
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.SH NAME
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vtzerotruncate, vtzeroextend, vtzeroscore \- Venti block truncation
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.SH SYNOPSIS
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.ft L
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#include <u.h>
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.br
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#include <libc.h>
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.br
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#include <venti.h>
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.ta +\w'\fLuint 'u
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.PP
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.B
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uint vtzerotruncate(int type, uchar *buf, uint size)
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.PP
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.B
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void vtzeroextend(int type, uchar *buf, uint size, uint newsize)
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.PP
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.B
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extern uchar vtzeroscore[VtScoreSize];
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.SH DESCRIPTION
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These utility functions compute how to truncate or replace
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trailing zeros (for data blocks) or trailing zero scores
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(for pointer blocks) to canonicalize the blocks before
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storing them to Venti.
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.PP
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.I Vtzerotruncate
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returns the size of the
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.IR size -byte
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buffer pointed to by
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.I buf
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ignoring trailing zeros or zero scores,
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according to the given
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.IR type .
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.PP
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.I Vtzeroextend
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pads
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.I buf
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with zeros or zero scores,
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according to the given
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.IR type ,
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to grow it from
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.I size
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bytes to
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.I newsize
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bytes.
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.PP
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.I Vtzeroscore
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is the score of the zero-length block.
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.SH SOURCE
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.B \*9/src/libventi/zero.c
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.br
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.B \*9/src/libventi/zeroscore.c
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.SH SEE ALSO
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.MR venti 3 ,
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.MR venti 7
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