From ed1f1d5f03356dec8091d4b53fe3f771d38e5bae Mon Sep 17 00:00:00 2001
From: Avril <flanchan@cumallover.me>
Date: Thu, 4 Nov 2021 14:23:50 +0000
Subject: [PATCH] C API: Start `next` shim
MIME-Version: 1.0
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Fortune for rngxx's current commit: Small blessing − 小吉
---
 include/rngxx.h     | 20 ++++++++++++++++++++
 src/capi-bridge.cpp | 34 ++++++++++++++++++++++++++++++++++
 src/capi-bridge.h   |  1 +
 src/capi.c          |  5 ++++-
 4 files changed, 59 insertions(+), 1 deletion(-)

diff --git a/include/rngxx.h b/include/rngxx.h
index 0933d8a..f3ee4dd 100644
--- a/include/rngxx.h
+++ b/include/rngxx.h
@@ -43,6 +43,26 @@ enum rng_next_type {
 	RNG_TY_F64,
 }; // 4 bits
 
+struct rng_next_opt {
+	union {
+		// Bounded types
+		struct {
+			const void* restrict pmin;
+			const void* restrict pmax;
+		} range;
+		// Blob types
+		size_t len;
+	} bound;
+
+	struct {
+		enum rng_next_type type : 4;
+		enum rng_next_flag mod  : 2;
+		uint8_t _unused		: 2;
+	} ty; // 8 bits	
+};
+
+typedef __typeof( ((struct rng_next_opt*)NULL)->ty ) rng_next_tyq; // Qualified type
+
 // -- // --
 #ifndef _RNGXX_IMPL_ONLY_TYPES
 // -- C API functions -- (C++ NO compat)
diff --git a/src/capi-bridge.cpp b/src/capi-bridge.cpp
index 1484ead..523a97d 100644
--- a/src/capi-bridge.cpp
+++ b/src/capi-bridge.cpp
@@ -5,6 +5,25 @@
 
 #include "capi-bridge.h"
 
+
+namespace bridge _export(internal)
+{
+	void nblob(Random& restrict engine, unsigned char* restrict output, size_t es, size_t l)
+	{
+		size_t len = es * l; // full length (bytes)
+		
+	}
+	inline void nblob(Random& restrict engine, unsigned char* restrict output, size_t len) { nblob(engine, output, 1, len); }
+
+	constexpr inline size_t ty_sizeof(rng_next_type ty)
+	{
+		//TODO:
+	}
+	
+	constexpr inline bool ty_signed(rng_next_flag f) { return ! (f & RNG_TYQ_UNSIGNED); }
+	constexpr inline bool ty_signed(const rng_next_tyq& qt) { return ty_signed(qt.mod); }
+}
+
 extern "C" {
 	// Internal bridge members
 	_export(internal)	
@@ -17,7 +36,22 @@ extern "C" {
 			default: return NULL;
 		}
 	}
+	_export(internal)
+	int RNG_IMPL(mnext)(rng_t* restrict engine, void* restrict output, const rng_next_opt* restrict opt)
+	{
+		if(opt->ty.mod & RNG_TYQ_CHAOS) {
+			bridge::nblob(*engine, reinterpret_cast<unsigned char*>(output), bridge::ty_sizeof(opt->ty.type), opt->bound.len);
+			return 1;
+		}
 
+		switch(opt->ty.type)
+		{
+			case RNG_TY_BLOB: bridge::nblob(*engine, reinterpret_cast<unsigned char*>(output), opt->bound.len); break;
+			//TODO: Rest of types
+			default: return 0;
+		}
+		return 1;
+	}
 
 	// Direct C interface members
 	void rng_free(rng_t* rng)
diff --git a/src/capi-bridge.h b/src/capi-bridge.h
index b2977b2..c4de1cc 100644
--- a/src/capi-bridge.h
+++ b/src/capi-bridge.h
@@ -17,6 +17,7 @@ extern "C" {
 #endif
 
 rng_t* RNG_IMPL(mkdriver)(enum rng_kind kind, u64* restrict seed) _export(internal);
+int RNG_IMPL(mnext)(rng_t* restrict engine, void* restrict output, const struct rng_next_opt* restrict opt) _export(internal);
 
 #ifdef __cplusplus
 }
diff --git a/src/capi.c b/src/capi.c
index 5bc4b3b..2903697 100644
--- a/src/capi.c
+++ b/src/capi.c
@@ -19,4 +19,7 @@ rng_t* rng_new(enum rng_kind kind, u64 seed[static restrict 1])
 }
 // void rng_free() - direct bridge
 
-
+int rng_next(rng_t* restrict engine, void* restrict output, struct rng_next_opt opt)
+{
+	return RNG_IMPL(mnext)(engine, output, &opt);
+}