lib: Add mlibc

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 43 insertions, 0 deletions

diff --git a/lib/mlibc/options/ansi/generic/fenv-stubs.cpp b/lib/mlibc/options/ansi/generic/fenv-stubs.cpp
new file mode 100644
index 0000000..7153844
--- /dev/null
+++ b/lib/mlibc/options/ansi/generic/fenv-stubs.cpp
@@ -0,0 +1,43 @@
+
+#include <bits/ensure.h>
+#include <fenv.h>
+
+// The functions that are not in this file but are defined in the header
+// are implemented like musl does in assembly.
+extern "C" __attribute__((__visibility__("hidden"))) int __fesetround(int);
+
+int fegetexceptflag(fexcept_t *, int) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+int feholdexcept(fenv_t *) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+int fesetexceptflag(const fexcept_t *, int) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+int fesetround(int r) {
+	if (r != FE_TONEAREST
+#ifdef FE_DOWNWARD
+		&& r != FE_DOWNWARD
+#endif
+#ifdef FE_UPWARD
+		&& r != FE_UPWARD
+#endif
+#ifdef FE_TOWARDZERO
+		&& r != FE_TOWARDZERO
+#endif
+	)
+		return -1;
+	return __fesetround(r);
+}
+
+int feupdateenv(const fenv_t *) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}