The Boston Diaries

The ongoing saga of a programmer who doesn't live in Boston, nor does he even like Boston, but yet named his weblog/journal “The Boston Diaries.”

Go figure.

Tuesday, January 10, 2012

99 ways to program a hex, Part 2: K&R C

One rule I've set for myself: the output of each program shall be the same (if at all possible). And the baseline for the output is yesterday's version. It's also a useful test—if the output doesn't match, there's a bug somewhere. Other than that, anything goes.

Today's code is written using a style known as “K&R C.”

* Copyright 2012 by Sean Conner.  All Rights Reserved.
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
* Comments, questions and criticisms can be sent to:

/* Style: K&R C */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#define LINESIZE	  16


char **argv;
	int i;
	FILE *fp;
	if (argc == 1)
	else {
		for (i = 1 ; i < argc ; i++) {
			fp = fopen(argv[i],"rb");
			if (fp == NULL) {


	return 0;


FILE *fpin,*fpout;
	char buffer[BUFSIZ],ascii[LINESIZE + 1],*pbyte;
	int offset = 0,bread,j,i;
	while((bread = fread(buffer,1,BUFSIZ,fpin)) > 0) {
		pbyte = buffer;
		while (bread > 0) {
			fprintf(fpout,"%08lX: ",(unsigned long)offset);
			j = 0;
			do {
				fprintf(fpout,"%02X ",(unsigned char)*pbyte);
				if (*pbyte >= ' ' && *pbyte <= '~')
					ascii [j] = *pbyte;
					ascii [j] = '.';
			} while ((j < LINESIZE) && (bread > 0));
			ascii [j] = '\0';
			if (j < LINESIZE) {
				for (i = j ; i < LINESIZE ; i++) 
					fprintf(fpout,"   ");
		if (fflush(fpout) == EOF) {


The term “K&R” is still used to refer to a particular style of writing C code (which I personally can't stand, but that's me)—the placement of opening braces, the severe indentation and often times a vowel impairment in names (which I didn't go for here).

But the term can also refer to code written before C was first standardized in 1989 (that is known as “ANSI C” or “C89”). While you had to always declare all your variables, function parameters, on the other hand, only had to be mentioned and unless otherwise noted, were assumed to be of type int. The same goes for the function return value—unless otherwise noted, all functions return a type of int.

Obligatory Picture

[“I am NOT a number, I am … a Q-CODE!”]

Obligatory Contact Info

Obligatory Feeds

Obligatory Links

Obligatory Miscellaneous

You have my permission to link freely to any entry here. Go ahead, I won't bite. I promise.

The dates are the permanent links to that day's entries (or entry, if there is only one entry). The titles are the permanent links to that entry only. The format for the links are simple: Start with the base link for this site:, then add the date you are interested in, say 2000/08/01, so that would make the final URL:

You can also specify the entire month by leaving off the day portion. You can even select an arbitrary portion of time.

You may also note subtle shading of the links and that's intentional: the “closer” the link is (relative to the page) the “brighter” it appears. It's an experiment in using color shading to denote the distance a link is from here. If you don't notice it, don't worry; it's not all that important.

It is assumed that every brand name, slogan, corporate name, symbol, design element, et cetera mentioned in these pages is a protected and/or trademarked entity, the sole property of its owner(s), and acknowledgement of this status is implied.

Copyright © 1999-2024 by Sean Conner. All Rights Reserved.