start: c Random subclass (jrand48_r())

Fortune for cpprng's current commit: Curse − 凶

Makefile

@@ -4,8 +4,8 @@
 PROJECT=rng
 AUTHOR=Avril (Flanchan) <flanchan@cumallover.me>
 
-SRC_C   = $(wildcard src/*.c)
+SRC_C   = $(wildcard src/*.c) $(wildcard src/rng/*.c)
-SRC_CXX = $(wildcard src/*.cpp)
+SRC_CXX = $(wildcard src/*.cpp) $(wildcard src/rng/*.cpp)
 
 INCLUDE=include
 
@@ -59,7 +59,7 @@ debug: | dirs $(PROJECT)-debug
 # Targets
 
 dirs:
-	@mkdir -p obj/c{,xx}/src
+	@mkdir -p obj/c{,xx}/src{,/rng}
 
 obj/c/%.o: %.c
 	$(CC) -c $< $(CFLAGS) -o $@ $(LDFLAGS)

src/rng/crand.c

@@ -0,0 +1,39 @@
+#include <stdlib.h>
+#include <string.h>
+
+#include "crand.h"
+
+struct jr_state
+{
+	long result;
+	struct drand48_data data;
+	union {
+		unsigned short xsubi[3];
+		unsigned int   xsubh;
+	} st;
+};
+
+void _jr_seed(struct jr_state* restrict state, unsigned int with)
+{
+	state->st.xsubh = with & JR_MAX;
+	seed48_r(state->st.xsubi, &state->data);
+}
+
+long _jr_proc(struct jr_state* restrict state)
+{
+	jrand48_r(state->st.xsubi, &state->data, &state->result);
+	return state->result;
+}
+
+struct jr_state* _jr_alloc()
+{
+	struct jr_state* bx = aligned_alloc(_Alignof(struct jr_state), sizeof(struct jr_state));
+	memset(bx, 0, sizeof(struct jr_state));
+
+	return bx;
+}
+
+void _jr_free(struct jr_state* restrict state)
+{
+	free(state);
+}

src/rng/crand.cpp

@@ -0,0 +1,8 @@
+#include <rng.h>
+
+#include "crand.h"
+
+namespace rng
+{
+	
+}

src/rng/crand.h

@@ -0,0 +1,25 @@
+#ifndef _CRAND_H
+#define _CRAND_H
+
+#include <common.h>
+
+#define JR_MAX (UINT32_MAX >> 8)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct jr_state;
+
+//TODO: make all these functions visibility("internal")
+
+void _jr_seed(struct jr_state* restrict state, unsigned int with);
+long _jr_proc(struct jr_state* restrict state);
+struct jr_state* _jr_alloc();
+void _jr_free(struct jr_state* restrict state);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif