[Add] Select joystick by name with option -J [string] as well as id with -j [id]

src/joystick.c

@@ -1,11 +1,30 @@
 #include <SDL.h>
+#include <string.h>
 #include "def.h"
 #include "log.h"
 #include "joystick.h"
 
 static SDL_Joystick* joystick = NULL;
 
+int joystick_get(char* namjoystick) {
+  int i;
+  for(i = 0; i < SDL_NumJoysticks(); i++)
+    if(strstr(SDL_JoystickName(i), namjoystick))
+      return i;
+
+  WARN("Joystick '%s' not found, using default joystick '%s'",
+        namjoystick, SDL_JoystickName(0));
+  return 0;
+}
+
 int joystick_use(int indjoystick) {
+  if(indjoystick < 0 || indjoystick >= SDL_NumJoysticks()) {
+    WARN("Joystick of index number %d does not exist. Switching to default (0)", indjoystick);
+    indjoystick = 0;
+  }
+  if(joystick)
+    // Might as well close it if it is open already.
+    SDL_JoystickClose(joystick);
   // Start using the joystick.
   LOG("Using joystick %d", indjoystick);
   joystick = SDL_JoystickOpen(indjoystick);

src/joystick.h

@@ -1,7 +1,12 @@
 #pragma once
 
+// Get the joystick index number based on its name.
+int joystick_get(char* namjoystick);
+
+// set the game to use the joystick of index indjoystick.
 int joystick_use(int indjoystick);
 
+// Exit functions.
 int joystick_init(void);
 void joystick_exit(void);
 

src/main.c

@@ -1,5 +1,6 @@
 #include <SDL.h>
 #include <unistd.h>
+#include <string.h>
 
 #include "def.h"
 #include "log.h"
@@ -24,12 +25,13 @@ static void update_all(void);
 
 // Usage.
 void print_usage(char** argv) {
-  LOG("USAGE: %s [-f] [-j n] [-hv]", argv[0]);
+  LOG("USAGE: %s [-f] [-j n | -J s] [-hv]", argv[0]);
   LOG("Options are:");
   LOG("\t-f   - Fullscreen");
   LOG("\t-w n - Set width to (n)");
   LOG("\t-h n - Set height to (n)");
   LOG("\t-j n - Use joystick (n)");
+  LOG("\t-K s - Use joystick whose name contains (s)");
   LOG("\t-h   - Display this message and exit.");
   LOG("\t-v   - Print the version and exit");
 }
@@ -43,10 +45,11 @@ int main(int argc, char** argv) {
   gl_screen.fullscreen = 0;
   // Joystick.
   int indjoystick = -1;
+  char* namjoystick = NULL;
 
   // Parse arguments.
   int c = 0;
-  while((c = getopt(argc, argv, "fj:hv")) != -1) {
+  while((c = getopt(argc, argv, "fJ:j:hv")) != -1) {
     switch(c) {
       case 'f':
         gl_screen.fullscreen = 1;
@@ -54,6 +57,9 @@ int main(int argc, char** argv) {
       case 'j':
         indjoystick = atoi(optarg);
         break;
+      case 'J':
+        namjoystick = strdup(optarg);
+        break;
       case 'v':
         LOG("Lephisto: version %d.%d.%d\n", VMAJOR, VMINOR, VREV);
       case 'h':
@@ -73,9 +79,14 @@ int main(int argc, char** argv) {
   }
 
   // Input.
-  if(indjoystick >= 0) {
+  if(indjoystick >= 0 || namjoystick != NULL) {
     if(joystick_init())
       WARN("Error initializing joystick input");
+    if(namjoystick != NULL) {
+      joystick_use(joystick_get(namjoystick));
+      free(namjoystick);
+    }
+    else if(indjoystick >= 0)
       joystick_use(indjoystick);
   }