Quick Review: strdup()

{

char *new_string;

// Allocate memory for the new string using malloc(). The size of the new

// memory is the size of the original string, plus 1 for the NULL at the end.

new_string = (char *) malloc((strlen(original_string) + 1) * sizeof(char));

// Copy the old string into the space just allocated for the new string.

strcpy(new_string, original_string);

// Return a pointer to the memory that we just allocated.

return new_string;

}

main()

{

char string1[50];

char *string2;

strcpy(string1, “John Doe”); // OK

strcpy(string2, string1); // ERROR -- string2 is a wild pointer

string2 = strdup(string1); // OK

free(string1); // ERROR -- don’t free an array

free(string2); // REQUIRED -- in order to free the mem allocated by strdup

}