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.
86 lines
1.5 KiB
Groff
86 lines
1.5 KiB
Groff
.TH ENCODE 3
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.SH NAME
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dec64, enc64, dec32, enc32, dec16, enc16, encodefmt \- encoding byte arrays as strings
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.SH SYNOPSIS
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.B #include <u.h>
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.br
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.B #include <libc.h>
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.PP
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.B
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int dec64(uchar *out, int lim, char *in, int n)
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.PP
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.B
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int enc64(char *out, int lim, uchar *in, int n)
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.PP
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.B
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int dec32(uchar *out, int lim, char *in, int n)
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.PP
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.B
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int enc32(char *out, int lim, uchar *in, int n)
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.PP
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.B
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int dec16(uchar *out, int lim, char *in, int n)
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.PP
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.B
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int enc16(char *out, int lim, uchar *in, int n)
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.PP
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.B
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int encodefmt(Fmt*)
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.SH DESCRIPTION
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.PP
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.IR Enc16 ,
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.I enc32
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and
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.I enc64
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create null terminated strings. They return the size of the
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encoded string (without the null) or -1 if the encoding fails.
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The encoding fails if
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.IR lim ,
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the length of the output buffer, is too small.
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.PP
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.IR Dec16 ,
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.I dec32
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and
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.I dec64
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return the number of bytes decoded or -1 if the decoding fails.
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The decoding fails if the output buffer is not large enough or,
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for base 32, if the input buffer length is not a multiple
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of 8.
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.PP
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.I Encodefmt
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can be used with
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.MR fmtinstall 3
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and
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.MR print 3
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to print encoded representations of byte arrays.
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The verbs are
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.TP
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.B H
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base 16 (i.e. hexadecimal). The default encoding is
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in upper case. The
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.B l
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flag forces lower case.
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.TP
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.B <
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base 32
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.TP
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.B [
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base 64 (same as MIME)
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.PD
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.PP
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The length of the array is specified as
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.IR f2 .
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For example, to display a 15 byte array as hex:
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.EX
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char x[15];
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fmtinstall('H', encodefmt);
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print("%.*H\\n", sizeof x, x);
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.EE
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.SH SOURCE
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.B \*9/src/lib9/u32.c
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.br
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.B \*9/src/lib9/u64.c
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