strtod bug with locales using non-ASCII decimal separators

[Roozbeh Pournader]

glibc's current 'strtod' can't parse numbers *starting* with a decimal 
separator if the locale is using a non-ASCII decimal separator. Test case 
follows. Changing the string to "\x30\xd9\xab\x35" makes it working. So 
does changing the string to ".5" and setting the locale to "C".

roozbeh

Test case:

#include <locale.h>
#include <stdio.h>
#include <stdlib.h>

int main()
{
  char *s = "\xd9\xab\x35"; /* Unicode: U+066B (ARABIC DECIMAL SEPARATOR),
                                        U+0035 (DIGIT FIVE) */
  char *locale = "fa_IR.UTF-8";
  char *endptr;
  double ret;

  setlocale(LC_ALL, locale);
  ret = strtod(s, &endptr);
  printf("ret == %f, endptr - s == %d\n", ret, endptr - s);
  return 0;
}