1.\" -*- nroff -*- 2.\" 3.\" Copyright (c) 2003 Scott Long 4.\" 5.\" All rights reserved. 6.\" 7.\" This program is free software. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR 19.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, 22.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28.\" 29.\" $FreeBSD$ 30.\" 31.Dd May 8, 2020 32.Dt HEXDUMP 3 33.Os 34.Sh NAME 35.Nm hexdump 36.Nd "dump a block of bytes to standard out in hexadecimal form" 37.Sh SYNOPSIS 38.In libutil.h 39.Ft void 40.Fn hexdump "void *ptr" "int length" "const char *hdr" "int flags" 41.Sh DESCRIPTION 42The 43.Fn hexdump 44function prints an array of bytes to standard out in hexadecimal form, 45along with the ASCII representation of the bytes, if possible. 46By default, each line of output will start with an offset count, followed by 16 47hexadecimal values, followed by 16 ASCII characters. 48.Bl -tag -width indent 49.It Fa ptr 50Pointer to the array of bytes to print. 51It does not need to be 52.Dv NUL Ns 53-terminated. 54.It Fa length 55Number of bytes to print. 56.It Fa hdr 57Pointer to a 58.Dv NUL Ns 59-terminated character string that will be prepended to each 60line of output. 61A value of 62.Dv NULL 63implies that no header will be printed. 64.It Fa flags 65Flags for controlling the formatting of the output. 66.Bl -tag -width ".Dv HD_OMIT_COUNT" 67.It Bits 0-7 68Integer value of the number of bytes to display on each line. 69A value of 0 implies that the default value of 16 will be used. 70.It Bits 8-15 71Character ASCII value to use as the separator for the hexadecimal output. 72A value of 0 implies that the default value of 32 73.Pq ASCII space 74will be used. 75.It Dv HD_OMIT_COUNT 76Do not print the offset column at the beginning of each line. 77.It Dv HD_OMIT_HEX 78Do not print the hexadecimal values on each line. 79.It Dv HD_OMIT_CHARS 80Do not print the character values on each line. 81.El 82.El 83.Sh SEE ALSO 84.Xr ascii 7 , 85.Xr sbuf_hexdump 9 86.Sh HISTORY 87The 88.Fn hexdump 89function first appeared in 90.Fx 6.4 . 91.Sh AUTHORS 92This manual page was written by 93.An Scott Long . 94