From: Sebastien Bourdeauducq <sebastien@milkymist.org>
Date: Fri, 25 May 2012 16:57:23 +0000 (+0200)
Subject: software/libbase: srand and RAND_MAX
X-Git-Tag: 24jan2021_ls180~3167
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=8e0461121f15caae1433a6008eb6f00c7cfbf0e2;p=litex.git

software/libbase: srand and RAND_MAX
---

diff --git a/software/include/base/stdlib.h b/software/include/base/stdlib.h
index 685cc5a6..cea677d5 100644
--- a/software/include/base/stdlib.h
+++ b/software/include/base/stdlib.h
@@ -49,7 +49,10 @@ char *number(char *buf, char *end, unsigned long num, int base, int size, int pr
 long strtol(const char *nptr, char **endptr, int base);
 float atof(const char *s);
 
+#define   RAND_MAX        2147483647
+
 unsigned int rand(void);
+void srand(unsigned int seed);
 void abort(void);
 
 #endif /* __STDLIB_H */
diff --git a/software/libbase/libc.c b/software/libbase/libc.c
index 565927a5..18b7f90a 100644
--- a/software/libbase/libc.c
+++ b/software/libbase/libc.c
@@ -563,11 +563,16 @@ int sprintf(char * buf, const char *fmt, ...)
  * rand - Returns a pseudo random number
  */
 
-static unsigned int seed;
+static unsigned int randseed;
 unsigned int rand(void)
 {
-	seed = 129 * seed + 907633385;
-	return seed;
+	randseed = 129 * randseed + 907633385;
+	return randseed;
+}
+
+void srand(unsigned int seed)
+{
+	randseed = seed;
 }
 
 void abort(void)