Implemented math.h

libc/math/log.c

@@ -0,0 +1,35 @@
+#include <math.h>
+
+#define _LOG_TERMS  20
+
+double log(double x) {
+    if (x <= 0.0) return -INFINITY;
+
+    double result = 0.0;
+    double term = (x - 1.0) / (x + 1.0);
+    double termSquared = term*term;
+    double numerator = term;
+
+    for (int i = 1; i < _LOG_TERMS; i++) {
+        result += numerator / (double)i;
+        numerator *= termSquared;
+    }
+
+    return 2.0 * result;
+}
+
+double log2(double x) {
+    if (x <= 0.0) return -INFINITY;
+    return log(x) / M_LN2;
+}
+
+double log10(double x) {
+    if (x <= 0.0) return -INFINITY;
+    return log(x) / M_LN10;
+}
+
+double logn(double x, double n) {
+    if (x <= 0.0) return -INFINITY;
+    return log(x) / log(n);
+}
+