getenvmemory

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc,char**argv)
{
 char *ptr;

 if(argc<3){
	 printf("Usage: %s <environment var> <target program name>\n", argv[0]);
	 exit(0);
	 }

  ptr = getenv(argv[1]);

  //there is an increment of 2 bytes for every bytes added to the name of the program (pg.141 ericson, or see example at the end)
  ptr += (strlen(argv[0]) - strlen(argv[2]))*2;

  printf("%s will be at %p\n",argv[1],ptr);

  // or this also work
  printf("%08x", getenv(argv[1]));

}