feat: some extensions to kernel standard c library. Other minor

improvements and formats

kernel/libc/ctype.c

@@ -0,0 +1,81 @@
+//
+// Created by rick on 25-03-21.
+//
+
+#include <ctype.h>
+
+int tolower(int c) {
+    if (c > 0xFF) {
+        // uh own
+        return c;
+    }
+    if (c >= 'A' && c <= 'Z') {
+        return c - 'A' + 'a';
+    }
+    return c;
+}
+
+int toupper(int c) {
+    if (c > 0xFF) {
+        // uh own
+        return c;
+    }
+    if (c >= 'a' && c <= 'z') {
+        return c - 'a' + 'A';
+    }
+    return c;
+}
+
+int isascii(int c) {
+    return c <= 0x7F;
+}
+
+int isblank(int c) {
+    return c == ' ' || c == '\t';
+}
+
+int iscntrl(int c) {
+    return c <= 0x1F || c == 0x7F;
+}
+
+int isdigit(int c) {
+    return c >= '0' && c <= '9';
+}
+
+int isgraph(int c) {
+    return c > ' ' && c < 0x7F;
+}
+
+int islower(int c) {
+    return c >= 'a' && c <= 'z';
+}
+
+int isprint(int c) {
+    return c >= ' ' && c < 0x7F;
+}
+
+int ispunct(int c) {
+    return (c > ' ' && c <= '@')
+           || (c >= '[' && c <= '`')
+           || (c >= '{' && c <= '~');
+}
+
+int isspace(int c) {
+    return c == ' ' || (c >= '\t' && c <= '\r');
+}
+
+int isupper(int c) {
+    return c >= 'A' && c <= 'Z';
+}
+
+int isxdigit(int c) {
+    return isdigit(c) || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F');
+}
+
+int isalpha(int c) {
+    return isupper(c) | islower(c);
+}
+
+int isalnum(int c) {
+    return isalpha(c) || isdigit(c);
+}