Added a utility function to simplify the hint handling logic

src/SDL_hints.c

@@ -119,18 +119,24 @@ SDL_GetHint(const char *name)
 }
 
 SDL_bool
-SDL_GetHintBoolean(const char *name, SDL_bool default_value)
+SDL_GetStringBoolean(const char *value, SDL_bool default_value)
 {
-    const char *hint = SDL_GetHint(name);
-    if (!hint || !*hint) {
+    if (!value || !*value) {
         return default_value;
     }
-    if (*hint == '0' || SDL_strcasecmp(hint, "false") == 0) {
+    if (*value == '0' || SDL_strcasecmp(value, "false") == 0) {
         return SDL_FALSE;
     }
     return SDL_TRUE;
 }
 
+SDL_bool
+SDL_GetHintBoolean(const char *name, SDL_bool default_value)
+{
+    const char *hint = SDL_GetHint(name);
+    return SDL_GetStringBoolean(hint, default_value);
+}
+
 void
 SDL_AddHintCallback(const char *name, SDL_HintCallback callback, void *userdata)
 {

src/SDL_hints_c.h

@@ -0,0 +1,32 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "./SDL_internal.h"
+
+/* This file defines useful function for working with SDL hints */
+
+#ifndef SDL_hints_c_h_
+#define SDL_hints_c_h_
+
+extern SDL_bool SDL_GetStringBoolean(const char *value, SDL_bool default_value);
+
+#endif /* SDL_hints_c_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */

src/events/SDL_mouse.c

@@ -27,6 +27,7 @@
 #include "SDL_timer.h"
 #include "SDL_events.h"
 #include "SDL_events_c.h"
+#include "../SDL_hints_c.h"
 #include "../video/SDL_sysvideo.h"
 #ifdef __WIN32__
 #include "../core/windows/SDL_windows.h"    // For GetDoubleClickTime()
@@ -100,30 +101,21 @@ SDL_TouchMouseEventsChanged(void *userdata, const char *name, const char *oldVal
 {
     SDL_Mouse *mouse = (SDL_Mouse *)userdata;
 
-    if (hint && (*hint == '0' || SDL_strcasecmp(hint, "false") == 0)) {
-        mouse->touch_mouse_events = SDL_FALSE;
-    } else {
-        mouse->touch_mouse_events = SDL_TRUE;
-    }
+    mouse->touch_mouse_events = SDL_GetStringBoolean(hint, SDL_TRUE);
 }
 
 static void SDLCALL
 SDL_MouseTouchEventsChanged(void *userdata, const char *name, const char *oldValue, const char *hint)
 {
     SDL_Mouse *mouse = (SDL_Mouse *)userdata;
+    SDL_bool default_value;
 
-    if (hint == NULL || *hint == '\0') {
-        /* Default */
 #if defined(__ANDROID__) || (defined(__IPHONEOS__) && !defined(__TVOS__))
-        mouse->mouse_touch_events = SDL_TRUE;
+    default_value = SDL_TRUE;
 #else
-        mouse->mouse_touch_events = SDL_FALSE;
+    default_value = SDL_FALSE;
 #endif
-    } else if (*hint == '1' || SDL_strcasecmp(hint, "true") == 0) {
-        mouse->mouse_touch_events = SDL_TRUE;
-    } else {
-        mouse->mouse_touch_events = SDL_FALSE;
-    }
+    mouse->mouse_touch_events = SDL_GetStringBoolean(hint, default_value);
 
     if (mouse->mouse_touch_events) {
         SDL_AddTouch(SDL_MOUSE_TOUCHID, SDL_TOUCH_DEVICE_DIRECT, "mouse_input");

src/joystick/hidapi/SDL_hidapi_switch.c

@@ -33,6 +33,7 @@
 #include "SDL_gamecontroller.h"
 #include "../SDL_sysjoystick.h"
 #include "SDL_hidapijoystick_c.h"
+#include "../../SDL_hints_c.h"
 
 
 #ifdef SDL_JOYSTICK_HIDAPI_SWITCH
@@ -591,7 +592,7 @@ static Sint16 ApplyStickCalibration(SDL_DriverSwitch_Context *ctx, int nStick, i
 static void SDLCALL SDL_GameControllerButtonReportingHintChanged(void *userdata, const char *name, const char *oldValue, const char *hint)
 {
     SDL_DriverSwitch_Context *ctx = (SDL_DriverSwitch_Context *)userdata;
-    ctx->m_bUseButtonLabels = (!hint || !*hint || ((*hint != '0') && (SDL_strcasecmp(hint, "false") != 0)));
+    ctx->m_bUseButtonLabels = SDL_GetStringBoolean(hint, SDL_TRUE);
 }
 
 static Uint8 RemapButton(SDL_DriverSwitch_Context *ctx, Uint8 button)

src/joystick/hidapi/SDL_hidapijoystick.c

@@ -31,6 +31,7 @@
 #include "SDL_joystick.h"
 #include "../SDL_sysjoystick.h"
 #include "SDL_hidapijoystick_c.h"
+#include "../../SDL_hints_c.h"
 
 #if defined(__WIN32__)
 #include "../../core/windows/SDL_windows.h"
@@ -641,7 +642,7 @@ SDL_HIDAPIDriverHintChanged(void *userdata, const char *name, const char *oldVal
 {
     int i;
     SDL_HIDAPI_Device *device = SDL_HIDAPI_devices;
-    SDL_bool enabled = (!hint || !*hint || ((*hint != '0') && (SDL_strcasecmp(hint, "false") != 0)));
+    SDL_bool enabled = SDL_GetStringBoolean(hint, SDL_TRUE);
 
     if (SDL_strcmp(name, SDL_HINT_JOYSTICK_HIDAPI) == 0) {
         for (i = 0; i < SDL_arraysize(SDL_HIDAPI_drivers); ++i) {