sdcc-3.9.0 fork implementing GNU assembler syntax

This fork aims to provide better support for stm8-binutils

1 files changed, 89 insertions, 0 deletions

diff --git a/device/lib/pic16/libc/stdlib/rand.c b/device/lib/pic16/libc/stdlib/rand.c
new file mode 100644
index 0000000..efcd040
--- /dev/null
+++ b/device/lib/pic16/libc/stdlib/rand.c
@@ -0,0 +1,89 @@
+/*-------------------------------------------------------------------------
+   rand.c - random number generation routines
+
+   Copyright (C) 2005, Vangelis Rokas <vrokas at otenet.gr>
+
+   This library is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by the
+   Free Software Foundation; either version 2, or (at your option) any
+   later version.
+
+   This library 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License 
+   along with this library; see the file COPYING. If not, write to the
+   Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
+   MA 02110-1301, USA.
+
+   As a special exception, if you link this library with other files,
+   some of which are compiled with SDCC, to produce an executable,
+   this library does not by itself cause the resulting executable to
+   be covered by the GNU General Public License. This exception does
+   not however invalidate any other reasons why the executable file
+   might be covered by the GNU General Public License.
+-------------------------------------------------------------------------*/
+
+/*
+ * derived from the book "The C Programming Language," by Kernighan and Ritchie
+ */
+
+#include <stdlib.h>
+
+static long do_rand(unsigned long *ctx)
+{
+  return ((*ctx = *ctx * 1103515245UL + 12345UL) % ((unsigned long)RAND_MAX + 1));
+}
+
+long rand_r(unsigned long *ctx)
+{
+  unsigned long val = (unsigned long) *ctx;
+  
+    *ctx = do_rand(&val);
+    return (long) *ctx;
+}
+
+static unsigned long next = 1;
+
+long rand(void)
+{
+  return do_rand(&next);
+}
+
+void srand(unsigned long seed)
+{
+  next = seed;
+}
+
+#ifdef TEST
+
+main()
+{
+  int i;
+  unsigned long myseed;
+
+  stdout = STREAM_GPSIM;
+
+  printf("seeding rand with 0x19610910: \n");
+  srand(0x19610910);
+
+  printf("generating three pseudo-random numbers:\n");
+  for (i = 0; i < 10; i++)
+  {
+    printf("next random number = %ld\n", rand());
+  }
+
+  printf("generating the same sequence with rand_r:\n");
+  myseed = 0x19610910;
+  for (i = 0; i < 10; i++)
+  {
+    printf("next random number = %ld\n", rand_r(&myseed));
+  }
+
+  return 0;
+}
+
+#endif /* TEST */
+