[Fix] Avoid some other possible seg faults.

src/input.c

@@ -14,6 +14,7 @@
 #include "map.h"
 #include "escort.h"
 #include "land.h"
+#include "lstd.h"
 #include "input.h"
 
 #define KEY_PRESS   ( 1.) /**< Key is pressed. */

src/lstd.h

@@ -1,5 +1,6 @@
 #pragma once
 #include <ctype.h>
+#include <SDL/SDL.h>
 
 /**
  * @brief Check to see if k is in ascii area.
@@ -26,3 +27,13 @@
  */
 #define lstd_isspace(k) (lstd_checkascii(k) ? isspace(k) : 0)
 
+/**
+ * @brief Convert a key to lowercase if applicable.
+ */
+#define lstd_tolower(k) (lstd_checkascii(k) ? (SDLKey)tolower(k) : k)
+
+/**
+ * @brief Convert a key to uppercase if applicable.
+ */
+#define lstd_toupper(k) (lstd_checkascii(k) ? (SDLKey)toupper(k) : k)
+

src/options.c

@@ -68,7 +68,7 @@ void opt_menuKeybinds(void) {
       case KEYBIND_KEYBOARD:
         /* SDL_GetKeyName returns lowercase which is ugly. */
         if(lstd_isalpha(key))
-          snprintf(str[j], 64, "%s <%c>", keybindNames[j], toupper(key));
+          snprintf(str[j], 64, "%s <%c>", keybindNames[j], lstd_toupper(key));
         else
           snprintf(str[j], 64, "%s <%s>", keybindNames[j], SDL_GetKeyName(key));
         break;
@@ -152,7 +152,7 @@ static void menuKeybinds_update(unsigned int wid, char* name) {
         snprintf(bind, 32, "keyboard:   %s%s%c",
             (mod != KMOD_NONE) ? modToText(mod) : "",
             (mod != KMOD_NONE) ? " + " : "",
-            toupper(key));
+            lstd_toupper(key));
       else
         snprintf(bind, 32, "keyboard:   %s%s%s",
             (mod != KMOD_NONE) ? modToText(mod) : "",

src/toolkit.c

@@ -1994,7 +1994,7 @@ static int toolkit_inputInput(Uint8 type, Widget* inp, SDLKey key) {
 
       /* Uppder case characters. */
       else if(lstd_isalpha(key) && (mods & (KMOD_LSHIFT | KMOD_RSHIFT)))
-        inp->dat.inp.input[inp->dat.inp.pos++] = toupper(key);
+        inp->dat.inp.input[inp->dat.inp.pos++] = lstd_toupper(key);
 
       /* Rest. */
       else if(!lstd_iscntrl(key))