sysclib/ctype: add extern declaration for look_ctype_table in header

Add `extern const unsigned char *look_ctype_table(void);` to `iop/system/sysclib/include/ctype.h` so the header is self-contained. This prevents implicit-function-declaration warnings on strict builds and avoids prototype/ABI mismatches.

Files: iop/system/sysclib/include/ctype.h, iop/system/sysclib/include/sysclib.h, iop/system/sysclib/src/nonstd/ctype.c

Author: fjtrujy

iop/system/sysclib/include/ctype.h

@@ -20,6 +20,13 @@
 extern "C" {
 #endif
 
+extern unsigned char look_ctype_table(char character);
+extern void *get_ctype_table();
+
+/* These functions are non-standardized (char instead of int) */
+extern char _toupper(char c);
+extern char _tolower(char c);
+
 #define isascii(c)	((unsigned int)(c) <= 127)
 #define toascii(c)	((unsigned char)(c) & 127)
 

iop/system/sysclib/include/sysclib.h

@@ -30,10 +30,6 @@ typedef void (*print_callback_t)(void *context, int c);
 
 /* setjmp/longjmp are already defined in setjmp.h */
 
-/* These functions are non-standardized (char instead of int) */
-extern char _toupper(char c);
-extern char _tolower(char c);
-
 /* These functions are non-standardized (IOP-only functions operating on 32-bit integers instead of wchar_t) */
 extern void *_wmemcopy(u32 *dest, const u32 *src, size_t size);
 extern void *_wmemset(u32 *dest, u32 c, size_t size);
@@ -45,10 +41,6 @@ extern void *_wmemset(u32 *dest, u32 c, size_t size);
 /* This function is non-standard. */
 extern int prnt(print_callback_t, void *context, const char * format, va_list ap);
 
-/* These functions are used in the process of ctype.h and is non-standard. */
-extern unsigned char look_ctype_table(char character);
-extern void *get_ctype_table();
-
 /* This function is non-standard. */
 extern char *atob(char *s, int *i);
 

iop/system/sysclib/src/nonstd/ctype.c

@@ -11,7 +11,7 @@
 #define SYSCLIB_DISABLE_BUILTINS
 #include <sysclib.h>
 
-unsigned char ctype_table[128] = {
+static unsigned char ctype_table[128] = {
 	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
 	0x20, 0x08, 0x08, 0x08, 0x08, 0x08, 0x20, 0x20,
 	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,