April Missions

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

/*
    mission: str == "." || str == ".."
*/

int __stdcall isdot_1(const char* str)
{
    return strcmp(str, ".") == 0 || strcmp(str, "..") == 0;
}

int __stdcall isdot_2(const char* str)
{
    return str[0] == '.' && ( str[1] == 0 || ( str[1] == '.' && str[2] == 0 ) );
}

int __stdcall isdot_3(const char* str)
{
    /*
        assumes:
            - memory layout (little endian, 1-byte characters)
    */
    const unsigned short* buf = (const unsigned short*)str;

    return buf[0] == '.' || ( buf[0] == '..' && str[2] == 0 );
}

int __stdcall isdot_4(const char* str)
{
    /*
        assumes:
            - memory layout (little endian, 1-byte characters)
            - alignment and free access within alignment size
    */
    unsigned int val = ((unsigned int*)str)[0];

    val&= 0xffffff;

    return val=='..' || (unsigned short)val=='.';
}

/*
    mission: left(str,2) == "\\"
*/

int __stdcall isunc_1(const char* str)
{
    return strncmp(str, "\\\\", 2) == 0;
}

int __stdcall isunc_2(const char* str)
{
    return str[0] == '\\' && str[1] == '\\';
}

int __stdcall isunc_3(const char* str)
{
    /*
        assumes:
            - memory layout (1-byte characters)
    */
    const unsigned short* buf = (const unsigned short*)str;

    return buf[0] == '\\\\';
}

/*
    mission: left(wstr,2) == "\\"
*/

int __stdcall isuncw_1(const wchar_t* str)
{
    return wcsncmp(str, L"\\\\", 2) == 0;
}

int __stdcall isuncw_2(const wchar_t* str)
{
    return str[0] == '\\' && str[1] == '\\';
}

int __stdcall isuncw_3(const wchar_t* str)
{
    /*
        assumes:
            - memory layout (2-byte characters)
    */
    const unsigned long* buf = (const unsigned long*)str;

    return buf[0] == ( ( '\\' << 16 ) | '\\' );
}

int main(int argc, char** argv)
{
    char* arg = argv[1];
    wchar_t* wrg = (wchar_t*)argc;

    if(isdot_1(arg)) return 1;
    if(isdot_2(arg)) return 2;
    if(isdot_3(arg)) return 3;
    if(isdot_4(arg)) return 4;

    if(isunc_1(arg)) return 1;
    if(isunc_2(arg)) return 2;
    if(isunc_3(arg)) return 3;

    if(isuncw_1(wrg)) return 1;
    if(isuncw_2(wrg)) return 2;
    if(isuncw_3(wrg)) return 3;

    return 0;
}