feature (utils): Implemented some 'is_char_' functions

kernel/inc/utils/string.h

@@ -48,6 +48,10 @@ void        string_hex_64bit_to_alpha       (string_t string, uint64_t value);
 void        string_bin_to_alpha             (string_t string, uint8_t num_bits, uint64_t value);
 void        string_bool_to_alpha            (string_t string, bool value);
 
+bool        string_is_char_text             (char chr);
+bool        string_is_char_number           (char chr);
 bool        string_is_char_alpha            (char chr);
+bool        string_is_char_uppercase        (char chr);
+bool        string_is_char_lowercase        (char chr);
 
 #endif //NOX_STRING_H

kernel/src/utils/memory.c

@@ -109,7 +109,7 @@ void memory_hexdump(uint8_t* address, uint64_t num) {
     for (uint64_t i = 0; i < rows; i++) {
         char buffer[10] = ".... ....";
         for (uint8_t j = 0; j < 8; j++) {
-            if (string_is_char_alpha((char)address[j])) {
+            if (string_is_char_text((char)address[j])) {
                 buffer[(j < 4) ? j : (j + 1)] = (char)address[j];
             }
         }
@@ -123,7 +123,7 @@ void memory_hexdump(uint8_t* address, uint64_t num) {
 
     char buffer[10] = "         ";
     for (uint8_t j = 0; j < remainder; j++) {
-        if (string_is_char_alpha((char)address[j])) {
+        if (string_is_char_text((char)address[j])) {
             buffer[(j < 4) ? j : (j + 1)] = (char)address[j];
         } else {
             buffer[(j < 4) ? j : (j + 1)] = '.';

kernel/src/utils/string.c

@@ -423,9 +423,37 @@ void string_bool_to_alpha(string_t string, bool value) {
     memory_copy(value ? "true" : "false", (void*)string, value ? 5 : 6);
 }
 
-bool string_is_char_alpha(char chr) {
+bool string_is_char_text(char chr) {
     if (chr >= '!' && chr <= '~') {
         return true;
     }
     return false;
+}
+
+bool string_is_char_number(char chr) {
+    if (chr >= '0' && chr <= '9') {
+        return true;
+    }
+    return false;
+}
+
+bool string_is_char_alpha(char chr) {
+    if (string_is_char_uppercase(chr) || string_is_char_lowercase(chr) || string_is_char_number(chr)) {
+        return true;
+    }
+    return false;
+}
+
+bool string_is_char_uppercase (char chr) {
+    if (chr >= 'A' && chr <= 'Z') {
+        return true;
+    }
+    return false;
+}
+
+bool string_is_char_lowercase (char chr) {
+    if (chr >= 'a' && chr <= 'z') {
+        return true;
+    }
+    return false;
 }