2010-10-18 Marco Atzeri <marco_atzeri@yahoo.it>

        * libm/Makefile.am: added complex functions documentation
        * libm/libm.texinfo: ditto
        * libm/complex/Makefile.am: Ditto
        * libm/complex/complex.tex: Ditto
        * libm/complex/(cabs.c, cacos.c, cacosh.c, carg.c,
        casin.c, casinh.c, catan.c, catanh.c, ccos.c, ccosh.c,
        cexp.c, cimag.c, clog.c, conj.c, cpow.c, cproj.c, creal.c,
        csin.c, csinh.c, csqrt.c, ctan.c, ctanh.c): Ditto
        * libm/Makefile.in: Regenerate
        * libm/complex/Makefile.in: Ditto

1 files changed, 46 insertions, 0 deletions

diff --git a/newlib/libm/complex/catanh.c b/newlib/libm/complex/catanh.c
index a06747037..2b9ef9e47 100644
--- a/newlib/libm/complex/catanh.c
+++ b/newlib/libm/complex/catanh.c
@@ -32,6 +32,52 @@
  * Marco Atzeri <marco_atzeri@yahoo.it>
  */
 
+/*
+FUNCTION
+        <<catanh>>, <<catanhf>>---complex arc hyperbolic tangent
+
+INDEX
+        catanh
+INDEX
+        catanhf
+
+ANSI_SYNOPSIS
+       #include <complex.h>
+       double complex catanh(double complex <[z]>);
+       float complex catanhf(float complex <[z]>);
+
+
+DESCRIPTION
+        These functions compute the complex arc hyperbolic tan of <[z]>,
+        with branch cuts outside the interval [-1, +1] along the
+        real axis.
+
+        <<catanhf>> is identical to <<catanh>>, except that it performs
+        its calculations on <<floats complex>>.
+
+RETURNS
+        @ifnottex
+        These functions return the complex arc hyperbolic tangent value,
+        in the range of a strip mathematically unbounded along the
+        real axis and in the interval [-i*p/2, +i*p/2] along the
+        imaginary axis.
+        @end ifnottex
+        @tex
+        These functions return the complex arc hyperbolic tangent value,
+        in the range of a strip mathematically unbounded along the
+        real axis and in the interval [$-i\pi/2$, $+i\pi/2$] along the
+        imaginary axis.
+        @end tex
+
+PORTABILITY
+        <<catanh>> and <<catanhf>> are ISO C99
+
+QUICKREF
+        <<catanh>> and <<catanhf>> are ISO C99
+
+*/
+
+
 #include <complex.h>
 
 double complex