[Emuelec] package sdljoytest - added sdl retroarch joystick map - version 4.9

sdl_ra_joystick_map.cpp

#include <SDL2/SDL.h>
#include <stdio.h>
#include <stdlib.h>
#include <vector>
#include <string>
#include <algorithm>

int DEBUG = 0;

// Function to find udev index from SDL joystick index
int find_index_from_sdl(int sdl_index) {
    if (SDL_Init(SDL_INIT_JOYSTICK) < 0) return -1;

    int count = SDL_NumJoysticks();
    if (sdl_index < 0 || sdl_index >= count) {
        fprintf(stderr, "Invalid SDL Joystick Index\n");
        return -1;
    }
    if (DEBUG) printf("SDL_NumJoysticks %d\n", count);

    // 1. Get Syspath from SDL
    std::vector<std::pair<std::string,int>> sdlpaths = {};

    for(int i=0; i < count; ++i) {
        const char *sdl_syspath = SDL_JoystickPathForIndex(i);
        if (!sdl_syspath) continue;
        std::string syspath_str(sdl_syspath);
        sdlpaths.push_back(std::make_pair(syspath_str, i));
    }
    std::sort(sdlpaths.begin(), sdlpaths.end());

    SDL_QuitSubSystem(SDL_INIT_JOYSTICK);

    return sdlpaths[sdl_index].second;
}

int main(int argc, char *argv[]) {
    if (argc < 2) {
        printf("Usage: %s <SDL_Joystick_Index>\n", argv[0]);
        return 1;
    }

    int sdl_idx = atoi(argv[1]);
    int udev_idx = find_index_from_sdl(sdl_idx);

    if (udev_idx != -1)
        printf("%d\n", udev_idx);
    else
        printf("\n");

    return 0;
}