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
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*************************************************************************/
>
/* 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]