From 629688d345cd377559e164a5217fe030cbd84d95 Mon Sep 17 00:00:00 2001
From: arphaman <arphaman@gmail.com>
Date: Sun, 14 Jul 2013 14:07:24 +0100
Subject: added functions for unformatted write

---
 include/IO/Write.h    |  31 ++++++++++++
 lib/IO/CMakeLists.txt |   3 +-
 lib/IO/Write.cpp      | 127 ++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 160 insertions(+), 1 deletion(-)
 create mode 100644 include/IO/Write.h
 create mode 100644 lib/IO/Write.cpp

diff --git a/include/IO/Write.h b/include/IO/Write.h
new file mode 100644
index 0000000..f489a61
--- /dev/null
+++ b/include/IO/Write.h
@@ -0,0 +1,31 @@
+//===--- Write.h - Write implementation -------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBFLANG_IO_WRITE_H
+#define LLVM_LIBFLANG_IO_WRITE_H
+
+#include <stdint.h>
+#include "Libflang.h"
+
+struct WriteController {
+  const char *FormatPtr;
+  size_t FormatLength;
+  int32_t unit;
+  uint32_t flags;
+};
+
+LIBFLANG_ABI void libflang_write_start(WriteController *Controller);
+LIBFLANG_ABI void libflang_write_integer(WriteController *Controller, const void *Ptr, int32_t Size);
+LIBFLANG_ABI void libflang_write_real(WriteController *Controller, const void *Ptr, int32_t Size);
+LIBFLANG_ABI void libflang_write_complex(WriteController *Controller, const void *Ptr, int32_t Size);
+LIBFLANG_ABI void libflang_write_logical(WriteController *Controller, const void *Ptr, int32_t Size);
+LIBFLANG_ABI void libflang_write_character(WriteController *Controller, const char *Ptr, size_t Length);
+LIBFLANG_ABI void libflang_write_end(WriteController *Controller);
+
+#endif
diff --git a/lib/IO/CMakeLists.txt b/lib/IO/CMakeLists.txt
index 8b13789..c1fa3a5 100644
--- a/lib/IO/CMakeLists.txt
+++ b/lib/IO/CMakeLists.txt
@@ -1 +1,2 @@
-
+add_libflang_library(libflangIO
+  Write.cpp)
diff --git a/lib/IO/Write.cpp b/lib/IO/Write.cpp
new file mode 100644
index 0000000..5d1b11e
--- /dev/null
+++ b/lib/IO/Write.cpp
@@ -0,0 +1,127 @@
+#include <stdio.h>
+#include <string.h>
+#include "IO/Write.h"
+
+#ifdef _MSC_VER
+#define snprintf _snprintf
+#endif
+
+static void InvalidSizeError(WriteController *Controller, int32_t Size) {
+  // FIXME
+}
+
+template<typename T>
+static T getValue(const void *Ptr) {
+  return *(reinterpret_cast<const T*>(Ptr));
+}
+
+template<typename T>
+static T getValue(const void *Ptr,size_t I) {
+  return (reinterpret_cast<const T*>(Ptr))[I];
+}
+
+static int getIntValue(WriteController *Controller, const void *Ptr, int32_t Size) {
+  switch(Size) {
+  case 1:
+    return getValue<int8_t>(Ptr);
+  case 2:
+    return getValue<int16_t>(Ptr);
+  case 4:
+    return getValue<int32_t>(Ptr);
+  case 8:
+    return int(getValue<int64_t>(Ptr));
+  default:
+    InvalidSizeError(Controller, Size);
+    break;
+  }
+  return 0;
+}
+
+static FILE *getFilePtr(WriteController *Controller) {
+  return stdin;
+}
+
+class Buffer {
+  enum {
+    kStorageSize = 128
+  };
+  size_t Offset;
+  char Storage[kStorageSize];
+
+public:
+  Buffer() : Offset(0) {}
+
+  template <typename T>
+  void Print(const char *FMT, T Value) {
+    auto Remaining = size_t(kStorageSize)-Offset;
+    if(Remaining)
+      Offset += snprintf(Storage + Offset, Remaining, FMT, Value);
+  }
+
+  void Write(WriteController *Controller) {
+    fwrite(Storage, 1, Offset, getFilePtr(Controller));
+  }
+};
+
+template <typename T>
+static inline void SmallPrintf(WriteController *Controller, const char *FMT, T Value) {
+  Buffer Buf;
+  Buf.Print(FMT, Value);
+  Buf.Write(Controller);
+}
+
+template <typename T1, typename T2>
+static inline void SmallPrintf(WriteController *Controller, const char *FMT1, T1 Value1, const char *FMT2, T2 Value2) {
+  Buffer Buf;
+  Buf.Print(FMT1, Value1);
+  Buf.Print(FMT2, Value2);
+  Buf.Write(Controller);
+}
+
+LIBFLANG_ABI void libflang_write_start(WriteController *Controller) {
+
+}
+
+LIBFLANG_ABI void libflang_write_integer(WriteController *Controller, const void *Ptr, int32_t Size) {
+  SmallPrintf(Controller, "%i", getIntValue(Controller, Ptr, Size));
+}
+
+LIBFLANG_ABI void libflang_write_real(WriteController *Controller, const void *Ptr, int32_t Size) {
+  switch(Size) {
+  case 4:
+    SmallPrintf(Controller, "%g", getValue<float>(Ptr));
+    break;
+  case 8:
+    SmallPrintf(Controller, "%g", getValue<double>(Ptr));
+    break;
+  default:
+    InvalidSizeError(Controller, Size);
+    break;
+  }
+}
+
+LIBFLANG_ABI void libflang_write_complex(WriteController *Controller, const void *Ptr, int32_t Size) {
+  switch(Size) {
+  case 4:
+    SmallPrintf(Controller, "(%g, ", getValue<float>(Ptr), "%g)", getValue<float>(Ptr,1));
+    break;
+  case 8:
+    SmallPrintf(Controller, "(%g, ", getValue<double>(Ptr), "%g)", getValue<double>(Ptr,1));
+    break;
+  default:
+    InvalidSizeError(Controller, Size);
+    break;
+  }
+}
+
+LIBFLANG_ABI void libflang_write_logical(WriteController *Controller, const void *Ptr, int32_t Size) {
+  SmallPrintf(Controller, "%s", getIntValue(Controller, Ptr, Size) != 0? "true" : "false");
+}
+
+LIBFLANG_ABI void libflang_write_character(WriteController *Controller, const char *Ptr, size_t Length) {
+  fwrite(Ptr, 1, Length, getFilePtr(Controller));
+}
+
+LIBFLANG_ABI void libflang_write_end(WriteController *Controller) {
+  fwrite("\n", 1, 1, getFilePtr(Controller));
+}
-- 
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