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authorEric Andersen <andersen@codepoet.org>2001-06-18 08:48:15 +0000
committerEric Andersen <andersen@codepoet.org>2001-06-18 08:48:15 +0000
commit4db5f2c0a1e1a310c51bf2612a9e08dc22262b1e (patch)
tree2b3a2e17ade8acbba52955b8f8ecb1c919d744a5
parente13e3a7da6efc8c81b95883e01aecd0e41142f7d (diff)
I went nuts and wrote a generic rint implementation. I think it is
correct per the man page and a little testing seems to show it works. -Erik
-rw-r--r--TODO1
-rw-r--r--libm/double/Makefile2
-rw-r--r--libm/double/rint.c52
3 files changed, 53 insertions, 2 deletions
diff --git a/TODO b/TODO
index 8f91a3302..78f5b4b6e 100644
--- a/TODO
+++ b/TODO
@@ -13,7 +13,6 @@ run 'nm -D --size-sort -t d libuClibc-0.9.5.so' and work on the biggest things
(i.e. stuff at the end of the list) to make them smaller.
make inb/outb work (for lilo et all)
update: done for i386. lilo and the pcmcia tools compile cleanly now
-make rint work (for ip et all)
include/resolv.h does not define struct _res, and libc/inet/resolv.c
does not use this struct. res_init does nothing. the other res_*
functions are not implemented.
diff --git a/libm/double/Makefile b/libm/double/Makefile
index a53b44d2e..9eab8ef81 100644
--- a/libm/double/Makefile
+++ b/libm/double/Makefile
@@ -35,7 +35,7 @@ CSRC=acosh.c airy.c asin.c asinh.c atan.c atanh.c bdtr.c beta.c \
polevl.c polmisc.c polylog.c polyn.c pow.c powi.c psi.c rgamma.c round.c \
shichi.c sici.c sin.c sindg.c sinh.c spence.c stdtr.c struve.c \
tan.c tandg.c tanh.c unity.c yn.c zeta.c zetac.c \
- sqrt.c floor.c setprec.c mtherr.c noncephes.c
+ sqrt.c floor.c setprec.c mtherr.c noncephes.c rint.c
COBJS=$(patsubst %.c,%.o, $(CSRC))
diff --git a/libm/double/rint.c b/libm/double/rint.c
new file mode 100644
index 000000000..35cf5f503
--- /dev/null
+++ b/libm/double/rint.c
@@ -0,0 +1,52 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * rint for uClibc
+ *
+ * Copyright (C) 2001 by Lineo, inc.
+ * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Library General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <math.h>
+
+/* From the Linux man page:
+ *
+ * NAME
+ * rint - round to closest integer
+ *
+ * SYNOPSIS
+ * #include <math.h>
+ * double rint(double x);
+ *
+ * DESCRIPTION
+ * The rint() function rounds x to an integer value according
+ * to the prevalent rounding mode. The default rounding mode
+ * is to round to the nearest integer.
+ *
+ * RETURN VALUE
+ * The rint() function returns the integer value as a float­
+ * ing-point number.
+ */
+
+double rint (double x) {
+ double low = floor(x);
+ if (fmod(x,low) >= (double)0.5)
+ return(ceil(x));
+ else
+ return(low);
+}
+