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/*
** HEXDUMP.C - Dump a file.
**
** This Program Written By Paul Edwards w/ modifications by Bob Stout
** Released to the public domain
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
static void dodump(FILE *fp, long start, long count);
static void skipb(FILE *fp, long start);
main(int argc, char **argv)
{
FILE *fp;
long start, count;
if (argc < 2)
{
puts("Usage: HEXDUMP file_name [start] [length]");
return (EXIT_FAILURE);
}
if (argc > 2)
start = atol(*(argv + 2));
else start = 0L;
if (argc > 3)
count = atol(*(argv + 3));
else count = -1L;
fp = fopen(*(argv + 1), "rb");
if (fp == NULL)
{
printf("unable to open file %s for input\n", *(argv+1));
return (EXIT_FAILURE);
}
skipb(fp, start);
dodump(fp, start, count);
return (EXIT_SUCCESS);
}
static void dodump(FILE *fp, long start, long count)
{
int c, pos1, pos2;
long x = 0L;
char prtln[100];
while (((c = fgetc(fp)) != EOF) && (x != count))
{
if (x%16 == 0)
{
memset(prtln,' ',sizeof prtln);
sprintf(prtln,"%0.6X ", start + x);
pos1 = 8;
pos2 = 45;
}
sprintf(prtln + pos1, "%0.2X", c);
if (isprint(c))
sprintf(prtln + pos2, "%c", c);
else sprintf(prtln + pos2, ".");
pos1 += 2;
*(prtln+pos1) = ' ';
pos2++;
if (x % 4 == 3)
*(prtln + pos1++) = ' ';
if (x % 16 == 15)
printf("%s\n", prtln);
x++;
}
if (x % 16 != 15)
printf("%s\n", prtln);
return;
}
static void skipb(FILE *fp, long start)
{
long x = 0;
if (start == 0)
return;
while (x < start)
{
fgetc(fp);
x++;
}
return;
}
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