From 17d13e20666d388aba04357d98f7ed092b58bccb Mon Sep 17 00:00:00 2001
From: RazvanN7 <razvan.nitu1305@gmail.com>
Date: Tue, 1 Nov 2016 13:58:07 +0200
Subject: [PATCH] Issue 5236 - [patch] std.format.formattedRead/unformatValue
 does not support the raw reading of integer types

---
 std/format.d | 104 +++++++++++++++++++++++++++++++++------------------
 1 file changed, 68 insertions(+), 36 deletions(-)

diff --git a/std/format.d b/std/format.d
index fa1a11690..cfd4cbf1d 100644
--- a/std/format.d
+++ b/std/format.d
@@ -4302,7 +4302,7 @@ T unformatValue(T, Range, Char)(ref Range input, ref FormatSpec!Char spec)
     import std.conv : parse, text;
     if (spec.spec == 's')
     {
-        return parse!T(input);
+        static if(__traits(compiles, parse!T(input)) ) return parse!T(input);
     }
     enforce(find(acceptedSpecs!long, spec.spec).length,
             text("Wrong unformat specifier '%", spec.spec , "' for ", T.stringof));
@@ -4359,7 +4359,38 @@ T unformatValue(T, Range, Char)(ref Range input, ref FormatSpec!Char spec)
     enforce(spec.spec == 's',
             text("Wrong unformat specifier '%", spec.spec , "' for ", T.stringof));
 
-    return parse!T(input);
+    static if(__traits(compiles, parse!T(input)) ) return parse!T(input);
+}
+
+private T rawReadWrapper(T, Range)(ref Range input)
+{
+	enforce(
+            isSomeString!Range || ElementType!(Range).sizeof == 1,
+            "Cannot parse input of type %s".format(Range.stringof)
+        );
+	union X
+	{
+		ubyte[T.sizeof] raw;
+	    T typed;
+	}
+    X x;
+	foreach (i; 0 .. T.sizeof)
+	{
+		static if (isSomeString!Range)
+	    {
+	    	x.raw[i] = input[0];
+	       	input = input[1 .. $];
+	    }
+	    else
+	     {
+	     	// TODO: recheck this
+	       	x.raw[i] = cast(ubyte) input.front;
+	        input.popFront();
+	     }
+	}
+	    
+	return x.typed;
+
 }
 
 /**
@@ -4368,6 +4399,7 @@ T unformatValue(T, Range, Char)(ref Range input, ref FormatSpec!Char spec)
 T unformatValue(T, Range, Char)(ref Range input, ref FormatSpec!Char spec)
     if (isInputRange!Range && isIntegral!T && !is(T == enum))
 {
+ 
     import std.algorithm.searching : find;
     import std.conv : parse, text;
     enforce(find(acceptedSpecs!T, spec.spec).length,
@@ -4381,7 +4413,31 @@ T unformatValue(T, Range, Char)(ref Range input, ref FormatSpec!Char spec)
         spec.spec == 'b' ? 2 :
         spec.spec == 's' || spec.spec == 'd' || spec.spec == 'u' ? 10 : 0;
     assert(base != 0);
-    return parse!T(input, base);
+	
+    // raw read
+	//enforce(input.length >= T.sizeof);
+	if (spec.spec == 'r') return rawReadWrapper!T(input);
+
+	enforce(find(acceptedSpecs!T, spec.spec).length,
+    		text("Wrong unformat specifier '%", spec.spec , "' for ", T.stringof));
+
+	static if(__traits(compiles, parse!T(input, base)) ) return parse!T(input, base);
+	
+}
+
+version(none)unittest
+{
+    union B
+    {
+        char[int.sizeof] untyped;
+        int typed;
+    }
+    B b;
+    b.typed = 5;
+    char[] input = b.untyped[];
+    int witness;
+    formattedRead(input, "%r", &witness);
+    assert(witness == b.typed);
 }
 
 /**
@@ -4392,40 +4448,16 @@ T unformatValue(T, Range, Char)(ref Range input, ref FormatSpec!Char spec)
 {
     import std.algorithm.searching : find;
     import std.conv : parse, text;
-    if (spec.spec == 'r')
-    {
-        // raw read
-        //enforce(input.length >= T.sizeof);
-        enforce(
-            isSomeString!Range || ElementType!(Range).sizeof == 1,
-            "Cannot parse input of type %s".format(Range.stringof)
-        );
-        union X
-        {
-            ubyte[T.sizeof] raw;
-            T typed;
-        }
-        X x;
-        foreach (i; 0 .. T.sizeof)
-        {
-            static if (isSomeString!Range)
-            {
-                x.raw[i] = input[0];
-                input = input[1 .. $];
-            }
-            else
-            {
-                // TODO: recheck this
-                x.raw[i] = cast(ubyte) input.front;
-                input.popFront();
-            }
-        }
-        return x.typed;
-    }
+
+
+    // raw read
+	//enforce(input.length >= T.sizeof);
+    if (spec.spec == 'r') return rawReadWrapper!T(input);
+        
     enforce(find(acceptedSpecs!T, spec.spec).length,
             text("Wrong unformat specifier '%", spec.spec , "' for ", T.stringof));
 
-    return parse!T(input);
+    static if(__traits(compiles, parse!T(input)) ) return parse!T(input);
 }
 
 version(none)unittest
@@ -4600,7 +4632,7 @@ T unformatValue(T, Range, Char)(ref Range input, ref FormatSpec!Char spec)
     enforce(spec.spec == 's',
             text("Wrong unformat specifier '%", spec.spec , "' for ", T.stringof));
 
-    return parse!T(input);
+    static if(__traits(compiles, parse!T(input)) ) return parse!T(input);
 }
 
 @system pure unittest
@@ -4694,7 +4726,7 @@ T unformatValue(T, Range, Char)(ref Range input, ref FormatSpec!Char spec)
     enforce(spec.spec == 's',
             text("Wrong unformat specifier '%", spec.spec , "' for ", T.stringof));
 
-    return parse!T(input);
+    static if(__traits(compiles, parse!T(input)) ) return parse!T(input);
 }
 
 @system pure unittest