From 6bbb700c348150b7f16b185ec63eb0c1fcc92584 Mon Sep 17 00:00:00 2001
From: Jeff Johnston <jjohnstn@redhat.com>
Date: Thu, 27 Nov 2003 19:47:19 +0000
Subject: 2003-11-27  Artem B. Bityuckiy  <mail_lists@mail.ru>             Jeff
 Johnston  <jjohnstn@redhat.com>

        * libc/include/stdlib.h (lldiv_t): New type.
        (atoll, llabs, lldiv): New prototypes.
        * libc/stdlib/Makefile.am: Add support for atoll, llabs, and lldiv.
        * libc/stdlib/stdlib.tex: Ditto.
        * libc/stdlib/Makefile.in: Regenerated.
        * libc/stdlib/atoll.c: New file.
        * libc/stdlib/llabs.c: Ditto.
        * libc/stdlib/lldiv.c: Ditto.
---
 newlib/libc/stdlib/lldiv.c | 115 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 newlib/libc/stdlib/lldiv.c

(limited to 'newlib/libc/stdlib/lldiv.c')

diff --git a/newlib/libc/stdlib/lldiv.c b/newlib/libc/stdlib/lldiv.c
new file mode 100644
index 0000000..6b853e4
--- /dev/null
+++ b/newlib/libc/stdlib/lldiv.c
@@ -0,0 +1,115 @@
+/*
+FUNCTION
+<<lldiv>>---divide two long long integers
+
+INDEX
+        lldiv
+
+ANSI_SYNOPSIS
+        #include <stdlib.h>
+        lldiv_t lldiv(long long <[n]>, long long <[d]>);
+
+TRAD_SYNOPSIS
+        #include <stdlib.h>
+        lldiv_t lldiv(<[n]>, <[d]>)
+        long long <[n]>, <[d]>;
+
+DESCRIPTION
+Divide
+@tex
+$n/d$,
+@end tex
+@ifnottex
+<[n]>/<[d]>,
+@end ifnottex
+returning quotient and remainder as two long long integers in a structure 
+<<lldiv_t>>.
+
+RETURNS
+The result is represented with the structure
+
+. typedef struct
+. {
+.  long long quot;
+.  long long rem;
+. } lldiv_t;
+
+where the <<quot>> field represents the quotient, and <<rem>> the
+remainder.  For nonzero <[d]>, if `<<<[r]> = ldiv(<[n]>,<[d]>);>>' then
+<[n]> equals `<<<[r]>.rem + <[d]>*<[r]>.quot>>'.
+
+To divide <<long>> rather than <<long long>> values, use the similar
+function <<ldiv>>.
+
+PORTABILITY
+<<lldiv>> is ISO 9899 (C99) compatable.
+
+No supporting OS subroutines are required.
+*/
+
+/*-
+ * Copyright (c) 2001 Mike Barcroft <mike@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <stdlib.h>
+
+/*
+ * The ANSI standard says that |r.quot| <= |n/d|, where
+ * n/d is to be computed in infinite precision.  In other
+ * words, we should always truncate the quotient towards
+ * 0, never -infinity.
+ *
+ * Machine division and remainer may work either way when
+ * one or both of n or d is negative.  If only one is
+ * negative and r.quot has been truncated towards -inf,
+ * r.rem will have the same sign as denom and the opposite
+ * sign of num; if both are negative and r.quot has been
+ * truncated towards -inf, r.rem will be positive (will
+ * have the opposite sign of num).  These are considered
+ * `wrong'.
+ *
+ * If both are num and denom are positive, r will always
+ * be positive.
+ *
+ * This all boils down to:
+ *      if num >= 0, but r.rem < 0, we got the wrong answer.
+ * In that case, to get the right answer, add 1 to r.quot and
+ * subtract denom from r.rem.
+ */
+lldiv_t
+_DEFUN (lldiv, (number, denom), 
+       long long numer _AND long long denom)
+{
+	lldiv_t retval;
+
+	retval.quot = numer / denom;
+	retval.rem = numer % denom;
+	if (numer >= 0 && retval.rem < 0) {
+		retval.quot++;
+		retval.rem -= denom;
+	}
+	return (retval);
+}
+
-- 
cgit v1.1