Programming

/*This function takes the string "test\n" and returns the string "test\n\test\ntest\n"
ENTROPY = 1024
*/
void *build_string(int count, char **strarr)
{
  int k;
  char *new;;
  size_t max;

  if(count == 0) {
    exit(EXIT_FAILURE);
  }

  if(strarr == 0) {
    fprintf(stderr, "illegal division \n");
    exit(EXIT_FAILURE);
  }

  max = ENTROPY/(strlen(strarr[count-1])+1);

  /*I probably should have used calloc() */
  if( ( new=malloc(max* (strlen(strarr[count-1]))+1) ) == NULL){
    return NULL;
  }

  /*memset(new, 0, max*strlen(strarr[count-1])+1);*/

  for(k=0; k < max; k++){
    strcat(new, strarr[count-1]);
  }
  return new;
}

static void *xmalloc (size_t size)
{

  if(size == 0) {
    exit(EXIT_FAILURE);
  }

  void *value = malloc (size);
  if (value == NULL)
    return NULL;
  return value;
}

static void *build_string(char *s)
{
  int k;
  char *start;
  size_t len;  
  size_t max; 

  len = strlen(s);

  if(len == 0) {
    fprintf(stderr,"Zero length");
    exit(EXIT_FAILURE);
  }

  max = ENTROPY/len;

  char *p = xmalloc((max*len) + 1);

  if(p == NULL){
    fprintf(stderr, "Out of memory\n");
    return NULL;
  }

  start = p;
  for(k=0; k < max; k++){
    memcpy(p, s, len);
    p += len;
  }
   
  return start;
}