Merge pull request #14 from SatoMew/master

decompile random.c

asm/random.s

@@ -1,36 +0,0 @@
-	.include "asm/macros.inc"
-	.include "constants/constants.inc"
-
-	.syntax unified
-
-	.text
-
-	thumb_func_start Random
-Random: @ 8044EC8
-	ldr r2, _08044EDC @ =gUnknown_3005000
-	ldr r1, [r2]
-	ldr r0, _08044EE0 @ =0x41c64e6d
-	muls r0, r1
-	ldr r1, _08044EE4 @ =0x00006073
-	adds r0, r1
-	str r0, [r2]
-	lsrs r0, 16
-	bx lr
-	.align 2, 0
-_08044EDC: .4byte gUnknown_3005000
-_08044EE0: .4byte 0x41c64e6d
-_08044EE4: .4byte 0x00006073
-	thumb_func_end Random
-
-	thumb_func_start SeedRng
-SeedRng: @ 8044EE8
-	lsls r0, 16
-	lsrs r0, 16
-	ldr r1, _08044EF4 @ =gUnknown_3005000
-	str r0, [r1]
-	bx lr
-	.align 2, 0
-_08044EF4: .4byte gUnknown_3005000
-	thumb_func_end SeedRng
-
-	.align 2, 0 @ Don't pad with nop.

common_syms/random.txt

@@ -0,0 +1 @@
+gRngValue

src/random.c

@@ -0,0 +1,18 @@
+#include "global.h"
+#include "random.h"
+
+// The number 1103515245 comes from the example implementation
+// of rand and srand in the ISO C standard.
+
+u32 gRngValue;
+
+u16 Random(void)
+{
+	gRngValue = 1103515245 * gRngValue + 24691;
+	return gRngValue >> 16;
+}
+
+void SeedRng(u16 seed)
+{
+	gRngValue = seed;
+}

sym_common.txt

@@ -132,9 +132,9 @@ gUnknown_3004FF8: @ 3004FF8
 gUnknown_3004FFC: @ 3004FFC
 	.space 0x4
 
-gUnknown_3005000: @ 3005000
+	.include "random.o"
-	.space 0x4
+	
-
+	.align 2
 gUnknown_3005004: @ 3005004
 	.space 0x4