tventi-zero.3 - plan9port - [fork] Plan 9 from user space
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       tventi-zero.3 (1063B)
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            1 .TH VENTI-ZERO 3
            2 .SH NAME
            3 vtzerotruncate, vtzeroextend, vtzeroscore \- Venti block truncation
            4 .SH SYNOPSIS
            5 .ft L
            6 #include <u.h>
            7 .br
            8 #include <libc.h>
            9 .br
           10 #include <venti.h>
           11 .ta +\w'\fLuint 'u
           12 .PP
           13 .B
           14 uint        vtzerotruncate(int type, uchar *buf, uint size)
           15 .PP
           16 .B
           17 void        vtzeroextend(int type, uchar *buf, uint size, uint newsize)
           18 .PP
           19 .B
           20 extern uchar vtzeroscore[VtScoreSize];
           21 .SH DESCRIPTION
           22 These utility functions compute how to truncate or replace
           23 trailing zeros (for data blocks) or trailing zero scores
           24 (for pointer blocks) to canonicalize the blocks before
           25 storing them to Venti.
           26 .PP
           27 .I Vtzerotruncate
           28 returns the size of the 
           29 .IR size -byte
           30 buffer pointed to by
           31 .I buf
           32 ignoring trailing zeros or zero scores,
           33 according to the given
           34 .IR type .
           35 .PP
           36 .I Vtzeroextend
           37 pads
           38 .I buf
           39 with zeros or zero scores,
           40 according to the given
           41 .IR type ,
           42 to grow it from
           43 .I size
           44 bytes to
           45 .I newsize
           46 bytes.
           47 .PP
           48 .I Vtzeroscore
           49 is the score of the zero-length block.
           50 .SH SOURCE
           51 .B \*9/src/libventi/zero.c
           52 .br
           53 .B \*9/src/libventi/zeroscore.c
           54 .SH SEE ALSO
           55 .MR venti (3) ,
           56 .MR venti (7)