kc3-lang/SDL

diff --git a/include/SDL_stdinc.h b/include/SDL_stdinc.h
index 59d7edb..d96e18b 100644
--- a/include/SDL_stdinc.h
+++ b/include/SDL_stdinc.h
@@ -408,6 +408,8 @@ extern DECLSPEC int SDLCALL SDL_abs(int x);
 
 extern DECLSPEC int SDLCALL SDL_isdigit(int x);
 extern DECLSPEC int SDLCALL SDL_isspace(int x);
+extern DECLSPEC int SDLCALL SDL_isupper(int x);
+extern DECLSPEC int SDLCALL SDL_islower(int x);
 extern DECLSPEC int SDLCALL SDL_toupper(int x);
 extern DECLSPEC int SDLCALL SDL_tolower(int x);
 
diff --git a/src/dynapi/SDL_dynapi_overrides.h b/src/dynapi/SDL_dynapi_overrides.h
index a1d8e2e..a5b4d6a 100644
--- a/src/dynapi/SDL_dynapi_overrides.h
+++ b/src/dynapi/SDL_dynapi_overrides.h
@@ -747,3 +747,5 @@
 #define SDL_OnApplicationDidBecomeActive SDL_OnApplicationDidBecomeActive_REAL
 #define SDL_OnApplicationDidChangeStatusBarOrientation SDL_OnApplicationDidChangeStatusBarOrientation_REAL
 #define SDL_GetAndroidSDKVersion SDL_GetAndroidSDKVersion_REAL
+#define SDL_isupper SDL_isupper_REAL
+#define SDL_islower SDL_islower_REAL
diff --git a/src/dynapi/SDL_dynapi_procs.h b/src/dynapi/SDL_dynapi_procs.h
index 0c9c335..404a5e7 100644
--- a/src/dynapi/SDL_dynapi_procs.h
+++ b/src/dynapi/SDL_dynapi_procs.h
@@ -807,3 +807,5 @@ SDL_DYNAPI_PROC(void,SDL_OnApplicationDidChangeStatusBarOrientation,(void),(),)
 #ifdef __ANDROID__
 SDL_DYNAPI_PROC(int,SDL_GetAndroidSDKVersion,(void),(),return)
 #endif
+SDL_DYNAPI_PROC(int,SDL_isupper,(int a),(a),return)
+SDL_DYNAPI_PROC(int,SDL_islower,(int a),(a),return)
diff --git a/src/stdlib/SDL_stdlib.c b/src/stdlib/SDL_stdlib.c
index bef47c7..c2774cb 100644
--- a/src/stdlib/SDL_stdlib.c
+++ b/src/stdlib/SDL_stdlib.c
@@ -438,11 +438,15 @@ int SDL_abs(int x)
 #if defined(HAVE_CTYPE_H)
 int SDL_isdigit(int x) { return isdigit(x); }
 int SDL_isspace(int x) { return isspace(x); }
+int SDL_isupper(int x) { return isupper(x); }
+int SDL_islower(int x) { return islower(x); }
 int SDL_toupper(int x) { return toupper(x); }
 int SDL_tolower(int x) { return tolower(x); }
 #else
 int SDL_isdigit(int x) { return ((x) >= '0') && ((x) <= '9'); }
 int SDL_isspace(int x) { return ((x) == ' ') || ((x) == '\t') || ((x) == '\r') || ((x) == '\n') || ((x) == '\f') || ((x) == '\v'); }
+int SDL_isupper(int x) { return ((x) >= 'A') && ((x) <= 'Z'); }
+int SDL_islower(int x) { return ((x) >= 'a') && ((x) <= 'z'); }
 int SDL_toupper(int x) { return ((x) >= 'a') && ((x) <= 'z') ? ('A'+((x)-'a')) : (x); }
 int SDL_tolower(int x) { return ((x) >= 'A') && ((x) <= 'Z') ? ('a'+((x)-'A')) : (x); }
 #endif