[njs] A workround for Solaris bugs in acos() and asin().

[Igor Sysoev]

details:   http://hg.nginx.org/njs/rev/f402a8c64d7a
branches:  
changeset: 261:f402a8c64d7a
user:      Igor Sysoev <igor at sysoev.ru>
date:      Wed Nov 16 15:21:07 2016 +0300
description:
A workround for Solaris bugs in acos() and asin().

diffstat:

 njs/njs_math.c |  22 ++++++++++++++++++++--
 1 files changed, 20 insertions(+), 2 deletions(-)

diffs (39 lines):

diff -r 73e4b9ddb4df -r f402a8c64d7a njs/njs_math.c
--- a/njs/njs_math.c	Wed Nov 16 15:21:03 2016 +0300
+++ b/njs/njs_math.c	Wed Nov 16 15:21:07 2016 +0300
@@ -47,7 +47,16 @@ njs_object_math_acos(njs_vm_t *vm, njs_v
     double  num;
 
     if (nargs > 1) {
-        num = acos(args[1].data.u.number);
+        num = args[1].data.u.number;
+
+#if (NXT_SOLARIS)
+        /* On Solaris acos(x) returns 0 for x > 1. */
+        if (fabs(num) > 1.0) {
+            num = NAN;
+        }
+#endif
+
+        num = acos(num);
 
     } else {
         num = NAN;
@@ -66,7 +75,16 @@ njs_object_math_asin(njs_vm_t *vm, njs_v
     double  num;
 
     if (nargs > 1) {
-        num = asin(args[1].data.u.number);
+        num = args[1].data.u.number;
+
+#if (NXT_SOLARIS)
+        /* On Solaris asin(x) returns 0 for x > 1. */
+        if (fabs(num) > 1.0) {
+            num = NAN;
+        }
+#endif
+
+        num = asin(num);
 
     } else {
         num = NAN;