Get current executable path

// Tested: Windows 7, OSX 10.10, Archlinux


#include <cstdlib>
#include <cstdio>
#include <algorithm>
#include <string>

#ifdef _WIN32
#   define WIN32_LEAN_AND_MEAN
#   include <Windows.h>
#elif defined(__APPLE__)
#   include <mach-o/dyld.h>
#else
#   include <unistd.h>
#endif

static std::string GetCurrentExecutablePath() {
    std::string result(128, '\0');
#ifdef _WIN32
    std::size_t bufsize;
    while ((bufsize = ::GetModuleFileNameA(NULL, &result[0], result.length())) == result.length()) {
        result.resize(result.length() * 2);
    }
    result.resize(bufsize);
#elif defined(__APPLE__)
    uint32_t bufsize = static_cast<uint32_t>(result.length());
    if (::_NSGetExecutablePath(&result[0], &bufsize) != 0) {
        result.resize(bufsize);
        ::_NSGetExecutablePath(&result[0], &bufsize);
    }
#else
    ssize_t bufsize;
    while ((bufsize = ::readlink(
#   ifdef __linux__
                    "/proc/self/exe"
#   else
                    "/proc/curproc/file"
#   endif
                    , &result[0], result.length())) >= static_cast<ssize_t>(result.length())) {
        result.resize(result.length() * 2);
    }
    if (bufsize < 0) {
        result.clear();
    } else {
        result.resize(bufsize);
    }
#endif

    result.resize(result.rfind(
#ifdef _WIN32
                    '\\'
#else
                    '/'
#endif
                    ) + 1);
    return result;
}
int main() {
    std::puts(GetCurrentExecutablePath().c_str());
}