feat: reformatted code base to be more standard

kernel/libc/stdlib.c

@@ -0,0 +1,78 @@
+/*
+ * libc.c
+ *
+ *  Created on: Oct 11, 2018
+ *      Author: rick
+ */
+
+#include <stdlib.h>
+
+/* everything of stdlib is implemented in this file except for:
+ * - qsort
+ **/
+
+
+int abs(int val) {
+    return val >= 0 ? val : (val * -1);
+}
+
+long labs(long val) {
+    return val >= 0 ? val : (val * -1);
+}
+
+long long llabs(long long val) {
+    return val >= 0 ? val : (val * -1);
+}
+
+// next stolen form https://www.techiedelight.com/implement-itoa-function-in-c/
+// inline function to swapc two numbers
+void swapc(char *x, char *y) {
+    char t = *x;
+    *x = *y;
+    *y = t;
+}
+
+// function to reverse buffer[i..j]
+char *reverse(char *buffer, int i, int j) {
+    while (i < j)
+        swapc(&buffer[i++], &buffer[j--]);
+
+    return buffer;
+}
+
+// Iterative function to implement itoa() function in C
+char *itoa(int value, char *buffer, int base) {
+    // invalid input
+    if (base < 2 || base > 32)
+        return buffer;
+
+    // consider absolute value of number
+    int n = abs(value);
+
+    int i = 0;
+    while (n) {
+        int r = n % base;
+
+        if (r >= 10)
+            buffer[i++] = 65 + (r - 10);
+        else
+            buffer[i++] = 48 + r;
+
+        n = n / base;
+    }
+
+    // if number is 0
+    if (i == 0)
+        buffer[i++] = '0';
+
+    // If base is 10 and value is negative, the resulting string
+    // is preceded with a minus sign (-)
+    // With any other base, value is always considered unsigned
+    if (value < 0 && base == 10)
+        buffer[i++] = '-';
+
+    buffer[i] = '\0'; // null terminate string
+
+    // reverse the string and return it
+    return reverse(buffer, 0, i - 1);
+}