/* PD implementation of strerror() for systems that don't have it.   Author: Guido van Rossum, CWI Amsterdam, Oct. 1990, <guido@cwi.nl>. */ #include <stdio.h>#include "Python.h" extern int sys_nerr;extern char *sys_errlist[]; char *strerror(int err){	static char buf[20];	if (err >= 0 && err < sys_nerr)		return sys_errlist[err];	PyOS_snprintf(buf, sizeof(buf), "Unknown errno %d", err);	return buf;}