Page fault with isspace(*p)

[John K. Hohm]

I am rewriting the regsvr stuff in dlls/comcat to make it practical to
extend to ole32 and all the other COM DLLs.  I have a nice simple function
to skip whitespace and return the next character:

static int getc_skipws(char const **p)
{
    while (isspace(*p))
        ++*p;
    return **p;
}

This gets called with **p == '['.  I get a page fault in the
implementation of isspace(), where the macro is testing 0x20 against the
value for '[' in the __ctype_b array.  What gives?