cast ctype functions input to unsigned char

From the manpage: If c is not an unsigned char value, or EOF, the
behavior of these functions is undefined.
(So putting char into them directly is wrong)

ir/debug/debugger.c

@@ -974,10 +974,10 @@ static unsigned get_token(void)
 	/* skip white space */
 	do {
 		c = next_char();
-	} while (c != '\0' && isspace(c));
+	} while (c != '\0' && isspace((unsigned char)c));
 
 	lexer.tok_start = lexer.curr_pos - 1;
-	if (c == '.' || isalpha(c)) {
+	if (c == '.' || isalpha((unsigned char)c)) {
 		/* command begins here */
 		int         len = 0;
 		const char* tok_start;
@@ -985,7 +985,7 @@ static unsigned get_token(void)
 		do {
 			c = next_char();
 			++len;
-		} while (isgraph(c));
+		} while (isgraph((unsigned char)c));
 		unput();
 
 		tok_start = lexer.tok_start;
@@ -1002,7 +1002,7 @@ static unsigned get_token(void)
 		lexer.s   = lexer.tok_start;
 		lexer.len = lexer.curr_pos - lexer.s;
 		return tok_identifier;
-	} else if (isdigit(c) || c == '-') {
+	} else if (isdigit((unsigned char)c) || c == '-') {
 		unsigned number = 0;
 		unsigned sign   = 0;
 
@@ -1019,12 +1019,12 @@ static unsigned get_token(void)
 				for (;;) {
 					c = next_char();
 
-					if (! isxdigit(c))
+					if (! isxdigit((unsigned char)c))
 						break;
-					if (isdigit(c))
+					if (isdigit((unsigned char)c))
 						number = (number << 4) | (c - '0');
 					else
-						number = (number << 4) | (toupper(c) - 'A' + 10);
+						number = (number << 4) | (toupper((unsigned char)c) - 'A' + 10);
 				}
 				unput();
 				lexer.number = number;
@@ -1032,7 +1032,7 @@ static unsigned get_token(void)
 			}
 		}
 		for (;;) {
-			if (! isdigit(c))
+			if (! isdigit((unsigned char)c))
 				break;
 			number = number * 10 + (c - '0');
 			c = next_char();

ir/ir/irargs.c

@@ -140,7 +140,7 @@ static int firm_emit(lc_appendable_t *app,
 	case k_entity: {
 		ir_entity *entity = (ir_entity*)X;
 		snprintf(buf, sizeof(buf), "%s%s", A("ent"),
-			isupper(occ->conversion) ? get_entity_ld_name_ex(entity): get_entity_name(entity));
+			isupper((unsigned char)occ->conversion) ? get_entity_ld_name_ex(entity): get_entity_name(entity));
 		snprintf(add, sizeof(add), "[%ld]", get_entity_nr(entity));
 		break;
 	}

ir/libcore/lc_opts.c

@@ -335,7 +335,7 @@ static char *strtolower(char *buf, size_t n, const char *str)
 {
 	unsigned i;
 	for (i = 0; i < n; ++i)
-		buf[i] = tolower(str[i]);
+		buf[i] = tolower((unsigned char)str[i]);
 	return buf;
 }
 

ir/libcore/lc_printf.c

@@ -104,11 +104,11 @@ int lc_arg_register(lc_arg_env_t *env, const char *name, char letter, const lc_a
 	arg.letter = letter;
 	arg.handler = handler;
 
-	if (isupper(letter)) {
+	if (isupper((unsigned char)letter)) {
 		map = env->upper;
 		base = 'A';
 	}
-	else if (islower(letter)) {
+	else if (islower((unsigned char)letter)) {
 		map = env->lower;
 		base = 'a';
 	}
@@ -462,12 +462,12 @@ int lc_evpprintf(const lc_arg_env_t *env, lc_appendable_t *app, const char *fmt,
 					const char *mod = s;
 
 					/* Read, as long there are letters */
-					while (isalpha(ch) && !arg) {
+					while (isalpha((unsigned char)ch) && !arg) {
 						int base = 'a';
 						lc_arg_t * const *map = env->lower;
 
 						/* If uppercase, select the uppercase map from the environment */
-						if (isupper(ch)) {
+						if (isupper((unsigned char)ch)) {
 							base = 'A';
 							map = env->upper;
 						}