Get a caller EXE name (WinAPI C)

#include <windows.h>
#include <stdio.h>


// Alloc bytes for chars
#define challoc(x) ((char *)malloc((sizeof(char))*(x)))


// Get a local EXE name.
// Yes, you cannot do it in one WinAPI function.
// Returns a naked string containing an EXE name (if successful), OR
// an empty string (if GetModuleFileNameA failed), OR
// an empty string (if runtime-linking failed), OR
// a string with a full path (if PathFindFileNameA failed).
char * GetExeName (void) {
    char *result = challoc(256);
    char temp[32769]; int temp1;

    HMODULE hShlwapi = LoadLibraryA("shlwapi.dll");
    FARPROC PathFindFileNameA = GetProcAddress(hShlwapi, "PathFindFileNameA");
    if (PathFindFileNameA == 0) return '\0';

    temp1 = GetModuleFileNameA(0, temp, 32769);
    if (temp1 == 0) return '\0';

    strcpy(result, (const char *)PathFindFileNameA(temp));

    FreeLibrary(hShlwapi);
    return result;
}


int main() {
    printf("%s\n", GetExeName());
}