Given that the following C program outputs -1 on my Win32 system:
#include <stdio.h>
#include <string.h>
void main(void) {
printf("%d\n", stricmp("a", "z"));
}
why is it that the following XS code outputs -25:
#include <string.h>
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
void foo(void) {
PerlIO_printf(PerlIO_stdout(), "%d\n", stricmp("a", "z"));
}
MODULE = Foo PACKAGE = Foo
void
foo()
? (The value output is not always -25: it varies according to how far
apart the two strings being compared are, e.g. stricmp("a", "e")
produces -4.)
The XS code is linked against msvcrt.dll, and so is the C program when I
compile & link it with "/MD" flag. Both versions are loading up the
same version of msvcrt.dll too -- simply the one in C:\WINDOWS\system32.
msvcrt.dll certainly exports a stricmp(), and there doesn't appear to be
one exported from perl58.dll. I also couldn't see any function
replacement games going on in the perl sources for this function.
So how is it that they produce different output?
- Steve
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