itos

lib/std/stdlib.cpp

@@ -0,0 +1,37 @@
+#include "stdlib.h"
+
+#include "string.h"
+
+void swap(int* x, int* y) {
+	int* t = x;
+	x = y;
+	y = t;
+}
+
+void reverse(char s[]) {
+	int i;
+	int j = strlen(s) - 1;
+	char c;
+
+	for (i = 0; i < j; i++) {
+		j--;
+		c = s[i];
+		s[i] = s[j];
+		s[j] = c;
+	}
+}
+
+void itoa(int i, char[] s) {
+	int i, sign;
+
+	if ((sign = n) < 0)  /* record sign */
+		n = -n;          /* make n positive */
+	i = 0;
+	do {       /* generate digits in reverse order */
+		s[i++] = n % 10 + '0';   /* get next digit */
+	} while ((n /= 10) > 0);     /* delete it */
+	if (sign < 0)
+		s[i++] = '-';
+	s[i] = '\0';
+	reverse(s);
+}