scc

commit 1345509e512142239a7a8e4265121e915e9e645a
parent dde31ff4005e93479be77b0cbf7803f43a6c44e1
Author: Roberto E. Vargas Caballero <roberto.vargas@midokura.com>
Date:   Tue, 16 Aug 2022 14:10:30 +0200

libc/rand: Use RAND_MAX instead of hardcoding it

Some additional comments are added to clarify the meaning of next.

Diffstat:
M
src/libc/stdlib/rand.c
 | 
12
+++++++++---

1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/src/libc/stdlib/rand.c b/src/libc/stdlib/rand.c
@@ -1,6 +1,7 @@
 #include <stdlib.h>
-#undef rand
+
 #undef srand
+#undef rand
 
 static unsigned long next;
 
@@ -11,8 +12,13 @@ srand(unsigned seed)
 }
 
 int
-rand(void)  /* RAND_MAX assumed to be 32767. */
+rand(void)
 {
+	/*
+	 * next is just an arbitrary number
+	 * used to generate a random number
+	 * which is <= RAND_MAX
+	 */
 	next = next * 1103515245 + 12345;
-	return (unsigned)(next/65536) % 32768;
+	return (unsigned)(next/65536) % (RAND_MAX + 1);
 }