Add hyperbolic functions: sinh, cosh, and others.

* arith.c (sinh_s, cosh_s, tanh_s, asinh_s, acosh_s, atanh_s):
New symbol variables.
(sinh, cosh, tanh, asinh, acosh, atanh): New static functions.
(sineh, cosih, tangh, asineh, acosih, atangh): New functions.
(arith_init): Register sinh, cosh, tanh, asinh, acosh and
atanh intrinsic functions, and initialize the new symbol
variables.

* configure: Detect availability of hyperbolic functions in
math library and defne HAVE_HYPERBOLICS as 1 in config.h
accordingly.

* lib.h (sineh, cosih, tangh, asineh, acosih, atangh):
Declared.

* txr.1: Documented new hyperbolic functions and their method
counterparts that a numeric struct can implement.

1 files changed, 20 insertions, 0 deletions

diff --git a/configure b/configure
index 87631366..21523893 100755
--- a/configure
+++ b/configure
@@ -2334,7 +2334,27 @@ else
   printf "no\n"
 fi
 
+printf "Checking for hyperbolic functions (sinh, ...) ... "
+cat > conftest.c <<!
+#include <math.h>
 
+int main(void)
+{
+  double a = cosh(0.5);
+  double b = sinh(0.5);
+  double c = tanh(0.5);
+  double d = acosh(0.5);
+  double e = asinh(0.5);
+  double f = atanh(0.5);
+  return 0;
+}
+!
+if conftest ; then
+  printf "yes\n"
+  printf "#define HAVE_HYPERBOLICS 1\n" >> config.h
+else
+  printf "no\n"
+fi
 
 printf "Checking for glob ... "