* * * * *
99 ways to program a hex, Part 5: C99 in K&R style
Like part 3 [1], today's version is C99 [2] in the K&R style [3]:
> /*************************************************************************
> *
> * 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
> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> * 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:
[email protected]
> *
> *************************************************************************/
>
> /* Style: C99 in K&R style */
>
> #include <stdio.h>
> #include <ctype.h>
> #include <string.h>
> #include <stdlib.h>
>
> #define LINESIZE 16
>
> static void do_dump (FILE *,FILE *);
>
> /****************************************************************/
>
> int main(int argc,char *argv[]) {
> if (argc == 1) {
> do_dump(stdin,stdout);
> } else {
> for (int i = 1 ; i < argc ; i++) {
> FILE *fp = fopen(argv[i],"rb");
> if (fp == NULL) {
> perror(argv[i]);
> continue;
> }
>
> printf("-----%s-----\n",argv[i]);
> do_dump(fp,stdout);
> fclose(fp);
> }
> }
>
> return EXIT_SUCCESS;
> }
>
> /******************************************************************/
>
> static void do_dump(FILE *fpin,FILE *fpout) {
> unsigned char buffer[BUFSIZ];
> size_t offset=0,bread;
>
> while((bread = fread(buffer,1,BUFSIZ,fpin)) > 0) {
> unsigned char *pbyte = buffer;
>
> while (bread > 0) {
> char ascii[LINESIZE + 1];
>
> fprintf(fpout,"%08lX: ",(unsigned long)offset);
> size_t j = 0;
> do {
> fprintf(fpout,"%02X ",*pbyte);
> if (isprint(*pbyte)) {
> ascii [j] = *pbyte;
> } else {
> ascii [j] = '.';
> }
> pbyte ++;
> offset ++;
> j ++;
> bread --;
> } while ((j < LINESIZE) && (bread > 0));
>
> ascii [j] = '\0';
>
> if (j < LINESIZE) {
> for (size_t i = j ; i < LINESIZE ; i++) {
> fprintf(fpout," ");
> }
> }
>
> fprintf(fpout,"%s\n",ascii);
>
> if (fflush(fpout) == EOF) {
> perror("output");
> exit(EXIT_FAILURE);
> }
> }
> }
> }
>
> /***************************************************************/
>
To the untrained eye, it probably looks like every other version I've
presented here, yet there is is a difference, subtle as it may be. But even
in the book that inspired this series [4] there were plenty of examples that
weren't all that much different.
At least, that's what I keep telling myself.
* Part 4: C99 [5]
* Part 6: C89, splint --strict compliant [6]
[1]
gopher://gopher.conman.org/0Phlog:2012/01/11.1
[2]
http://en.wikipedia.org/wiki/C99
[3]
http://en.wikipedia.org/wiki/1_true_brace_style
[4]
http://www.amazon.com/exec/obidos/ASIN/1596090782/conmanlaborat-20
[5]
gopher://gopher.conman.org/0Phlog:2012/01/12.3
[6]
gopher://gopher.conman.org/0Phlog:2012/01/14.1
Email author at
[email protected]
