99 ways to program a hex, Part 4: C99

Today's variation: C99 [1].

/*************************************************************************

• 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: sean@conman.org

*************************************************************************/

/* Style: C99 */

#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;

size_t bread;

offset = 0;

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);

}

}

}

/***************************************************************/

It's not much different than the C89 [2] version [3]. The main difference is the ability to declare variables when needed instead of the beginning of a block of code. I don't particularly care for that feature, but I do like the ability to declare variables inside the for() statement, like I've done here.

• Part 3: C89 in K&R style [4]
• Part 5: C99 in K&R style [5]

=> [1] http://en.wikipedia.org/wiki/C99 | [2] http://en.wikipedia.org/wiki/ANSI_C | [3] /boston/2012/01/09.1 | [4] /boston/2012/01/11.1 | [5] /boston/2012/01/13.1

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