* Crossposted in area PUBLIC_DOMAIN, ED_CODE

/*
 *  HEXDUMP.C - Dump a file.
 *
 *  This Program Written By Paul Edwards w/ modifications by Bob Stout
 *  Aditional modifications by Andrew Clarke
 *  Released to the public domain
 */

#include 
#include 
#include 
#include 

void skipb(FILE * fp, long start)
{
    long x = 0;
    while (x < start) {
        fgetc(fp);
        x++;
    }
}

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 = 60;
        }
        sprintf(prtln + pos1, "%0.2X", c);
        if (isprint(c))
            sprintf(prtln + pos2, "%c", c);
        else
            sprintf(prtln + pos2, ".");
        pos1 += 2;
        *(prtln + pos1) = ' ';
        pos1++;
        pos2++;
        if (x % 4 == 3)
            *(prtln + pos1++) = ' ';
        if (x % 16 == 15)
            printf("%s\n", prtln);
        x++;
    }
    if (x % 16 != 0)
        printf("%s\n", prtln);
}

int 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 = strtol(*(argv + 2), NULL, 0);
    else
        start = 0L;
    if (argc > 3)
        count = strtol(*(argv + 3), NULL, 0);
    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;
}

Regards
Andrew

--- Msgedsq/2 3.30