libc: Add fenv.h

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

1 files changed, 61 insertions, 0 deletions

diff --git a/src/lib/libc/include/fenv.h b/src/lib/libc/include/fenv.h
new file mode 100644
index 0000000..e5567db
--- /dev/null
+++ b/src/lib/libc/include/fenv.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2025 Ian Marco Moffett and L5 engineers
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _FENV_H
+#define _FENV_H 1
+
+#include <sys/types.h>
+
+typedef struct {
+	__uint32_t __control_word;
+	__uint32_t __status_word;
+	__uint32_t __unused[5];
+	__uint32_t __mxcsr;
+} fenv_t;
+
+typedef __uint16_t fexcept_t;
+
+#define FE_TONEAREST 0
+#define FE_DOWNWARD 0x400
+#define FE_UPWARD 0x800
+#define FE_TOWARDZERO 0xC00
+
+int feclearexcept(int __excepts);
+int fegetenv(fenv_t *__envp);
+int fegetexceptflag(fexcept_t *__envp, int __excepts);
+int fegetround(void);
+int feholdexcept(fenv_t *__envp);
+int feraiseexcept(int __excepts);
+int fesetenv(const fenv_t *__envp);
+int fesetexceptflag(const fexcept_t *__envp, int __excepts);
+int fesetround(int __round);
+int fetestexcept(int __excepts);
+int feupdateenv(const fenv_t *__envp);
+
+#endif  /* !_FENV_H */