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#include <stdlib.h>

#include <stdio.h>

#include <CoreFoundation/CoreFoundation.h>

#include <Carbon/Carbon.h>

int success = 0;

int fail = 1;

int internal_error = success; // enable dwarf on internal errors

int main(int argc, const char **argv)

{

    CFURLRef cfurl;

    OSStatus err = LSFindApplicationForInfo(0, CFSTR("com.apple.Xcode"), 0, 0, &cfurl);

    if (err != noErr)

        return internal_error;

    CFBundleRef bundle = CFBundleCreate(0, cfurl);

    if (bundle == 0)

        return internal_error;

    CFStringRef str = CFStringRef(CFBundleGetValueForInfoDictionaryKey(bundle, CFSTR("CFBundleShortVersionString")));

    const char * ptr = CFStringGetCStringPtr(str, 0);

    if (ptr == 0)

        return internal_error;        

    // self-test

    const char * fail1 = "2.4";

    const char * fail2 = "2.4.0";

    const char * fail3  ="2.3";

    const char * ok1  = "2.4.1";

    const char * ok2  ="2.5";

    const char * ok3  ="3.0";

//    ptr = fail1;

//    printf ("string: %s\n", ptr);

    int length = strlen(ptr);

    if (length < 3) // expect "x.y" at least

        return internal_error;

    // fail on 2.4 and below (2.4.1 is ok)

     if (ptr[0] < '2')

        return fail;

    if (ptr[0] >= '3')

        return success;

    if (ptr[2] < '4')

        return fail;

    if (length < 5)

        return fail;

    if (ptr[4] < '1')

        return fail;

    return success;

}