math: Clean up, add additional functions

* Add finite() variants, needed by some applications.
* Add remaining long double variants of existing functions.
* Sort and document existing functions, including where referenced in
  the LSB standard.

Signed-off-by: Samuel Holland <samuel@sholland.org>

1 files changed, 80 insertions, 11 deletions

diff --git a/libgcompat/math.c b/libgcompat/math.c
index 2982116..db123f8 100644
--- a/libgcompat/math.c
+++ b/libgcompat/math.c
@@ -1,27 +1,96 @@
-#include <math.h> /* isinf, isnan */
+#include <math.h> /* isfinite, isinf, isnan */
 
 #include "alias.h" /* weak_alias */
 
-int __isinff(float number)
+/**
+ * Test for finite value.
+ */
+int __finite(double arg)
 {
-	return isinf(number);
+	return isfinite(arg);
 }
-weak_alias(__isinff, isinff);
+weak_alias(__finite, finite);
+
+/**
+ * Test for finite value.
+ */
+int __finitef(float arg)
+{
+	return isfinite(arg);
+}
+weak_alias(__finitef, finitef);
+
+/**
+ * Test for finite value.
+ */
+int __finitel(long double arg)
+{
+	return isfinite(arg);
+}
+weak_alias(__finitel, finitel);
 
-int __isinf(double number)
+/**
+ * Test for infinity.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---isinf.html
+ */
+int __isinf(double arg)
 {
-	return isinf(number);
+	return isinf(arg);
 }
 weak_alias(__isinf, isinf);
 
-int __isnanf(float number)
+/**
+ * Test for infinity.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---isinff.html
+ */
+int __isinff(float arg)
 {
-	return isnan(number);
+	return isinf(arg);
 }
-weak_alias(__isnanf, isnanf);
+weak_alias(__isinff, isinff);
 
-int __isnan(double number)
+/**
+ * Test for infinity.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---isinfl.html
+ */
+int __isinfl(long double arg)
 {
-	return isnan(number);
+	return isinf(arg);
+}
+weak_alias(__isinfl, isinfl);
+
+/**
+ * Test for a NaN.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---isnan.html
+ */
+int __isnan(double arg)
+{
+	return isnan(arg);
 }
 weak_alias(__isnan, isnan);
+
+/**
+ * Test for a NaN.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---isnanf.html
+ */
+int __isnanf(float arg)
+{
+	return isnan(arg);
+}
+weak_alias(__isnanf, isnanf);
+
+/**
+ * Test for a NaN.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---isnanl.html
+ */
+int __isnanl(long double arg)
+{
+	return isnan(arg);
+}
+weak_alias(__isnanl, isnanl);