/* bsd-interf.c: test BSD interface.  */#ifndef _POSIX_SOURCE /* whole file */#include "test.h"voidtest_berk_search (pattern, string)    const char *pattern;    char *string;{  const char *return_value = re_comp (pattern);    if (return_value != 0)    {      printf ("This didn't compile: `%s'.\n", pattern);      printf ("  The error message was: `%s'.\n", return_value);    }  else    if (test_should_match && re_exec (string) != strlen (string))      {        printf ("Should have matched but didn't:\n");        printf ("  The pattern was: %s.\n", pattern);        if (string)          printf ("  The string was: `%s'.'n", string);        else          printf ("  The string was empty.\n");      }}voidtest_bsd_interface (){  test_berk_search ("a", "ab");}#endif /* _POSIX_SOURCE */