#include <string.h>
  
  size_t strlcpy(char * dst, const char * src, size_t len) {
    if (len == 0) {
      return 0;
    }
    const char * cur = src;
    const char * end = src+len-1;
    while (*cur != 0 && cur < end) {
      *dst++ = *cur++;
    }
    *dst = 0;
    return cur-src;
  }