LibC: Add ldexp

1 files changed, 16 insertions, 0 deletions

diff --git a/userland/libc/math/ldexp.c b/userland/libc/math/ldexp.c
new file mode 100644
index 0000000..06d4cd0
--- /dev/null
+++ b/userland/libc/math/ldexp.c
@@ -0,0 +1,16 @@
+#include <float.h>
+#include <math.h>
+
+double ldexp(double x, int exp) {
+  double sign = (x < 0.0) ? (-1) : (1);
+
+  if (exp > 29) {
+    return sign * HUGE_VAL;
+  }
+  double two_exp = 2 << exp;
+
+  if (x > DBL_MAX / two_exp) {
+    return sign * HUGE_VAL;
+  }
+  return x * two_exp;
+}