Write a C program to dump sections of memory in hexadecimal format. Specifically

Question

Write a C program to dump sections of memory in hexadecimal format. Specifically, you are required to print a memory map for all memory areas that correspond to the command-line arguments argc and argv.

You may use a 32-bit system, or a 64-bit system. In addition, the output should reflect the native endianness of the system you are using. Two output samples (32-bit, and 64-bit) are provided.

They were both generated using the following command line with little-endian byte order:

$ printMemoryMap A hippopotamus got on the bus

where printMemoryMap is the name of the executable file.

Explanation / Answer

#include <stdio.h>

void hexDump (char *desc, void *addr, int len) {
int i;
unsigned char buff[17];
unsigned char *pc = (unsigned char*)addr;

// Output description if given.
if (desc != NULL)
printf ("%s: ", desc);

if (len == 0) {
printf(" ZERO LENGTH ");
return;
}
if (len < 0) {
printf(" NEGATIVE LENGTH: %i ",len);
return;
}

// Process every byte in the data.
for (i = 0; i < len; i++) {
// Multiple of 16 means new line (with line offset).

if ((i % 16) == 0) {
// Just don't print ASCII for the zeroth line.
if (i != 0)
printf (" %s ", buff);

// Output the offset.
printf (" %04x ", i);
}

// Now the hex code for the specific character.
printf (" %02x", pc[i]);

// And store a printable ASCII character for later.
if ((pc[i] < 0x20) || (pc[i] > 0x7e))
buff[i % 16] = '.';
else
buff[i % 16] = pc[i];
buff[(i % 16) + 1] = '';
}

// Pad out last line if not exactly 16 characters.
while ((i % 16) != 0) {
printf (" ");
i++;
}

// And print the final ASCII bit.
printf (" %s ", buff);
}

int main (int argc, char *argv[]) {
char my_str[] = "a char string greater than 16 chars";
if(argc==2)
{
hexDump (argv[1], &argv, sizeof (argv));
}
else if(argc>2)
{
printf(" too many arguments!!!!");
}
else{
printf(" pass one more argument");
}
getch();
return 0;
}

commands to execute this program:

got to cmd and execute the following command

filename.exe arguments

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