bugs in strlen, strstr setlocale -- i386

I wried to build wget static.  The result is segmantation fault 
on i386.

I found the folowing problems:

#include <string.h>
int main() {
  return strlen((char *)0);
}

This gives segmentation fault!  
As a result strstr(0, "UTF-8") works also wrong.

The key is function setlocale.  I changed it so and then all
works fine.  

#include <locale.h>
#include <stdlib.h>
#include <string.h>
#include "dietlocale.h"

char *setlocale (int category, const char *locale) {
  lc_ctype=CT_8BIT;
  if (locale) {
    if ((category==LC_ALL || category==LC_CTYPE)) {
      if (!*locale) {
	const char* x;
	x=getenv("LC_CTYPE");
	if (!x) x=getenv("LC_ALL");
	if (!x) x="C";
	locale=x;
      }
    }
    if (strstr(locale,".UTF-8") || strstr(locale,".UTF8")) lc_ctype=CT_UTF8;
    if ((locale[0]!='C' || locale[1])) return 0;
  }
  return "C";
}


In wget source exist the line
oldlocale = setlocale (LC_TIME, NULL);
and it makes problems.  

Nikola