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92 lines
3.0 KiB
Groff
92 lines
3.0 KiB
Groff
.\" -*- nroff -*-
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.\"
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.\" Copyright (c) 2003 Scott Long
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.\"
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.\" All rights reserved.
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.\"
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.\" This program is free software.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd May 8, 2020
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.Dt HEXDUMP 3
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.Os
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.Sh NAME
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.Nm hexdump
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.Nd "dump a block of bytes to standard out in hexadecimal form"
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.Sh SYNOPSIS
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.In libutil.h
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.Ft void
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.Fn hexdump "void *ptr" "int length" "const char *hdr" "int flags"
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.Sh DESCRIPTION
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The
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.Fn hexdump
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function prints an array of bytes to standard out in hexadecimal form,
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along with the ASCII representation of the bytes, if possible.
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By default, each line of output will start with an offset count, followed by 16
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hexadecimal values, followed by 16 ASCII characters.
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.Bl -tag -width indent
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.It Fa ptr
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Pointer to the array of bytes to print.
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It does not need to be
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.Dv NUL Ns
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-terminated.
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.It Fa length
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Number of bytes to print.
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.It Fa hdr
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Pointer to a
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.Dv NUL Ns
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-terminated character string that will be prepended to each
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line of output.
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A value of
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.Dv NULL
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implies that no header will be printed.
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.It Fa flags
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Flags for controlling the formatting of the output.
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.Bl -tag -width ".Dv HD_OMIT_COUNT"
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.It Bits 0-7
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Integer value of the number of bytes to display on each line.
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A value of 0 implies that the default value of 16 will be used.
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.It Bits 8-15
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Character ASCII value to use as the separator for the hexadecimal output.
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A value of 0 implies that the default value of 32
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.Pq ASCII space
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will be used.
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.It Dv HD_OMIT_COUNT
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Do not print the offset column at the beginning of each line.
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.It Dv HD_OMIT_HEX
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Do not print the hexadecimal values on each line.
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.It Dv HD_OMIT_CHARS
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Do not print the character values on each line.
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.El
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.El
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.Sh SEE ALSO
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.Xr ascii 7 ,
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.Xr sbuf_hexdump 9
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.Sh HISTORY
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The
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.Fn hexdump
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function first appeared in
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.Fx 6.4 .
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.Sh AUTHORS
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This manual page was written by
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.An Scott Long .
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