//Demonstration of different string functions
//Lecture 11, CSE 374, Spring 2017

#include <stdio.h>
#include <strings.h>

//this is called strlen in the library
//return the length of the string (number of non-null characters)
int length(char* str) {
  int i = 0;
  while (str[i] != '\0') {
    i++;
  }
  return i;
}

//end the string str so it has len characters
//only call if len is in range of the string
void truncate(char* str, int len) {
  str[len] = '\0';
}

//copy a string from dest to source
//TODO: not quite finished
void copy(char* dst, char* src) {
  int i = 0;
  while (src[i] != '\0') {
    dst[i] = src[i];
    i++;
  }
  dst[i] = '\0';
}

//test our functions here
int main() {
  char* berry = "Blueberry";
  char* empty = "";
  char* long_string = "First line \n Second line";
  char* weird_string = "Thiu\bs has a backspace in it";
  printf("Length of %s is: %d\n", berry, length(berry));
  printf("Length of %s is: %d\n", empty, length(empty));
  printf("Length of %s is: %d\n", long_string, length(long_string));
  printf("Length of %s is: %d\n", weird_string, length(weird_string));
  char newberry[10];
  for (int i = 0; i < 10; i++) {
    newberry[i] = berry[i];
  }
  truncate(newberry, 4);
  printf("truncated to %s, length now: %d\n", newberry, length(newberry));
  char copy_test[10];
  copy(copy_test,berry);
  printf("copied berry string into copy_test: %s\n", copy_test);
  return 0;
}