1  #include <string.h>
       2  
       3  void validatedatetime(const char *str)
       4  {
       5    const char *templates[] = {"dddd-dd-dd dd:dd", "dddd-dd-dd"};
       6  
       7    size_t len = strlen(str);
       8  
       9    for (unsigned t = 0; t < 2; t++) {
      10      if (len != strlen(templates[t])) {
      11        continue;
      12      }
      13    }
      14  }