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authorKarl Berry <karl@freefriends.org>2012-05-18 00:35:36 +0000
committerKarl Berry <karl@freefriends.org>2012-05-18 00:35:36 +0000
commitff3def13189580da6fe5254355c8f3b8091bb0fb (patch)
tree13092e119e26dd5354f66cf3746dd0a0cbdd8cb2 /Build/source/utils/pmx/pmx-2.6.18/libf2c/c_sqrt.c
parent2721345a8954f1846ff48ba10e634bc65e7b954d (diff)
pmx 2.6.18 (16may12)
git-svn-id: svn://tug.org/texlive/trunk@26478 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Build/source/utils/pmx/pmx-2.6.18/libf2c/c_sqrt.c')
-rw-r--r--Build/source/utils/pmx/pmx-2.6.18/libf2c/c_sqrt.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/Build/source/utils/pmx/pmx-2.6.18/libf2c/c_sqrt.c b/Build/source/utils/pmx/pmx-2.6.18/libf2c/c_sqrt.c
new file mode 100644
index 00000000000..1678c534d60
--- /dev/null
+++ b/Build/source/utils/pmx/pmx-2.6.18/libf2c/c_sqrt.c
@@ -0,0 +1,41 @@
+#include "f2c.h"
+
+#ifdef KR_headers
+extern double sqrt(), f__cabs();
+
+VOID c_sqrt(r, z) complex *r, *z;
+#else
+#undef abs
+#include "math.h"
+#ifdef __cplusplus
+extern "C" {
+#endif
+extern double f__cabs(double, double);
+
+void c_sqrt(complex *r, complex *z)
+#endif
+{
+ double mag, t;
+ double zi = z->i, zr = z->r;
+
+ if( (mag = f__cabs(zr, zi)) == 0.)
+ r->r = r->i = 0.;
+ else if(zr > 0)
+ {
+ r->r = t = sqrt(0.5 * (mag + zr) );
+ t = zi / t;
+ r->i = 0.5 * t;
+ }
+ else
+ {
+ t = sqrt(0.5 * (mag - zr) );
+ if(zi < 0)
+ t = -t;
+ r->i = t;
+ t = zi / t;
+ r->r = 0.5 * t;
+ }
+ }
+#ifdef __cplusplus
+}
+#endif