string-copy-strange.c - En variant af string_copy der opbygger kopien i lokalt lager.

Lektion 7 - slide 21 : 26 Program 2

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


/* Copy s to a locally allocated string and return it */
char *string_copy(const char *s){
  
 static char new_str[8];  /* static is essential. Zero initialized */
 strncpy(new_str,s,7);

 return new_str;
}


int main(void) {

  char s[] = "Aalborg University", *t;
  t = string_copy(s);
  strcpy(s,"---");      /* destroy s */

  printf("The original is: %s.\nThe copy is: %s\n", s, t);
  
  return 0;
}