Index: kernel/generic/src/lib/str.c
===================================================================
--- kernel/generic/src/lib/str.c	(revision 04b7f2fb762e7d4d05b92755aa752d9adcb7a4a8)
+++ kernel/generic/src/lib/str.c	(revision 4db4718dad043fdba9393afca6e05aaf21c99c72)
@@ -42,5 +42,5 @@
  * strings, called just strings are encoded in UTF-8. Wide strings (encoded
  * in UTF-32) are supported to a limited degree. A single character is
- * represented as wchar_t.@n
+ * represented as char32_t.@n
  *
  * Overview of the terminology:@n
@@ -50,6 +50,6 @@
  *  byte                  8 bits stored in uint8_t (unsigned 8 bit integer)
  *
- *  character             UTF-32 encoded Unicode character, stored in wchar_t
- *                        (signed 32 bit integer), code points 0 .. 1114111
+ *  character             UTF-32 encoded Unicode character, stored in char32_t
+ *                        (unsigned 32 bit integer), code points 0 .. 1114111
  *                        are valid
  *
@@ -61,5 +61,5 @@
  *
  *  wide string           UTF-32 encoded NULL-terminated Unicode string,
- *                        wchar_t *
+ *                        char32_t *
  *
  *  [wide] string size    number of BYTES in a [wide] string (excluding
@@ -100,5 +100,5 @@
  * A specific character inside a [wide] string can be referred to by:@n
  *
- *  pointer (char *, wchar_t *)
+ *  pointer (char *, char32_t *)
  *  byte offset (size_t)
  *  character index (size_t)
@@ -118,11 +118,4 @@
 #include <macros.h>
 
-/** Check the condition if wchar_t is signed */
-#ifdef __WCHAR_UNSIGNED__
-#define WCHAR_SIGNED_CHECK(cond)  (true)
-#else
-#define WCHAR_SIGNED_CHECK(cond)  (cond)
-#endif
-
 /** Byte mask consisting of lowest @n bits (out of 8) */
 #define LO_MASK_8(n)  ((uint8_t) ((1 << (n)) - 1))
@@ -152,5 +145,5 @@
  *
  */
-wchar_t str_decode(const char *str, size_t *offset, size_t size)
+char32_t str_decode(const char *str, size_t *offset, size_t size)
 {
 	if (*offset + 1 > size)
@@ -189,5 +182,5 @@
 		return U_SPECIAL;
 
-	wchar_t ch = b0 & LO_MASK_8(b0_bits);
+	char32_t ch = b0 & LO_MASK_8(b0_bits);
 
 	/* Decode continuation bytes */
@@ -200,5 +193,5 @@
 
 		/* Shift data bits to ch */
-		ch = (ch << CONT_BITS) | (wchar_t) (b & LO_MASK_8(CONT_BITS));
+		ch = (ch << CONT_BITS) | (char32_t) (b & LO_MASK_8(CONT_BITS));
 		cbytes--;
 	}
@@ -222,5 +215,5 @@
  *         code was invalid.
  */
-errno_t chr_encode(const wchar_t ch, char *str, size_t *offset, size_t size)
+errno_t chr_encode(const char32_t ch, char *str, size_t *offset, size_t size)
 {
 	if (*offset >= size)
@@ -308,7 +301,7 @@
  *
  */
-size_t wstr_size(const wchar_t *str)
-{
-	return (wstr_length(str) * sizeof(wchar_t));
+size_t wstr_size(const char32_t *str)
+{
+	return (wstr_length(str) * sizeof(char32_t));
 }
 
@@ -354,7 +347,7 @@
  *
  */
-size_t wstr_lsize(const wchar_t *str, size_t max_len)
-{
-	return (wstr_nlength(str, max_len * sizeof(wchar_t)) * sizeof(wchar_t));
+size_t wstr_lsize(const char32_t *str, size_t max_len)
+{
+	return (wstr_nlength(str, max_len * sizeof(char32_t)) * sizeof(char32_t));
 }
 
@@ -384,5 +377,5 @@
  *
  */
-size_t wstr_length(const wchar_t *wstr)
+size_t wstr_length(const char32_t *wstr)
 {
 	size_t len = 0;
@@ -421,13 +414,13 @@
  *
  */
-size_t wstr_nlength(const wchar_t *str, size_t size)
+size_t wstr_nlength(const char32_t *str, size_t size)
 {
 	size_t len = 0;
-	size_t limit = ALIGN_DOWN(size, sizeof(wchar_t));
+	size_t limit = ALIGN_DOWN(size, sizeof(char32_t));
 	size_t offset = 0;
 
 	while ((offset < limit) && (*str++ != 0)) {
 		len++;
-		offset += sizeof(wchar_t);
+		offset += sizeof(char32_t);
 	}
 
@@ -440,7 +433,7 @@
  *
  */
-bool ascii_check(wchar_t ch)
-{
-	if (WCHAR_SIGNED_CHECK(ch >= 0) && (ch <= 127))
+bool ascii_check(char32_t ch)
+{
+	if (ch <= 127)
 		return true;
 
@@ -453,7 +446,7 @@
  *
  */
-bool chr_check(wchar_t ch)
-{
-	if (WCHAR_SIGNED_CHECK(ch >= 0) && (ch <= 1114111))
+bool chr_check(char32_t ch)
+{
+	if (ch <= 1114111)
 		return true;
 
@@ -481,6 +474,6 @@
 int str_cmp(const char *s1, const char *s2)
 {
-	wchar_t c1 = 0;
-	wchar_t c2 = 0;
+	char32_t c1 = 0;
+	char32_t c2 = 0;
 
 	size_t off1 = 0;
@@ -528,6 +521,6 @@
 int str_lcmp(const char *s1, const char *s2, size_t max_len)
 {
-	wchar_t c1 = 0;
-	wchar_t c2 = 0;
+	char32_t c1 = 0;
+	char32_t c2 = 0;
 
 	size_t off1 = 0;
@@ -580,5 +573,5 @@
 	size_t dest_off = 0;
 
-	wchar_t ch;
+	char32_t ch;
 	while ((ch = str_decode(src, &src_off, STR_NO_LIMIT)) != 0) {
 		if (chr_encode(ch, dest, &dest_off, size - 1) != EOK)
@@ -613,5 +606,5 @@
 	size_t dest_off = 0;
 
-	wchar_t ch;
+	char32_t ch;
 	while ((ch = str_decode(src, &src_off, n)) != 0) {
 		if (chr_encode(ch, dest, &dest_off, size - 1) != EOK)
@@ -628,11 +621,11 @@
  * written will always be well-formed.
  *
- * @param dest	Destination buffer.
- * @param size	Size of the destination buffer.
- * @param src	Source wide string.
- */
-void wstr_to_str(char *dest, size_t size, const wchar_t *src)
-{
-	wchar_t ch;
+ * @param dest Destination buffer.
+ * @param size Size of the destination buffer.
+ * @param src  Source wide string.
+ */
+void wstr_to_str(char *dest, size_t size, const char32_t *src)
+{
+	char32_t ch;
 	size_t src_idx;
 	size_t dest_off;
@@ -659,7 +652,7 @@
  * @return Pointer to character in @a str or NULL if not found.
  */
-char *str_chr(const char *str, wchar_t ch)
-{
-	wchar_t acc;
+char *str_chr(const char *str, char32_t ch)
+{
+	char32_t acc;
 	size_t off = 0;
 	size_t last = 0;
@@ -688,5 +681,5 @@
  *
  */
-bool wstr_linsert(wchar_t *str, wchar_t ch, size_t pos, size_t max_pos)
+bool wstr_linsert(char32_t *str, char32_t ch, size_t pos, size_t max_pos)
 {
 	size_t len = wstr_length(str);
@@ -716,5 +709,5 @@
  *
  */
-bool wstr_remove(wchar_t *str, size_t pos)
+bool wstr_remove(char32_t *str, size_t pos)
 {
 	size_t len = wstr_length(str);