From 25811f833b663f8708daab193326fc9362300b74 Mon Sep 17 00:00:00 2001
From: Amit Kumar Gupta <amitkgupta84@gmail.com>
Date: Mon, 25 Aug 2014 08:08:59 +0000
Subject: [PATCH] Revert "Remove (mostly) unused C print functions in linear
 package"

This reverts commit f9e41dec2860090e00dd1e0fb74c1beb79197ae5.
---
 linear_models/cfuncs.go             | 14 ++++++++++++++
 linear_models/liblinear.go          |  1 +
 linear_models/liblinear_print.go    | 27 +++++++++++++++++++++++++++
 linear_models/liblinear_print_11.go | 16 ++++++++++++++++
 4 files changed, 58 insertions(+)
 create mode 100644 linear_models/cfuncs.go
 create mode 100644 linear_models/liblinear_print.go
 create mode 100644 linear_models/liblinear_print_11.go

diff --git a/linear_models/cfuncs.go b/linear_models/cfuncs.go
new file mode 100644
index 0000000..bde2f0a
--- /dev/null
+++ b/linear_models/cfuncs.go
@@ -0,0 +1,14 @@
+// +build go1.2
+
+package linear_models
+
+/*
+
+void libLinearPrintFunc(char *);
+
+void golearn_liblinear_print_func_cgo(char *c) {
+    libLinearPrintFunc(c);
+}
+
+*/
+import "C"
diff --git a/linear_models/liblinear.go b/linear_models/liblinear.go
index e5d0682..0f627a2 100644
--- a/linear_models/liblinear.go
+++ b/linear_models/liblinear.go
@@ -59,6 +59,7 @@ func NewProblem(X [][]float64, y []float64, bias float64) *Problem {
 }
 
 func Train(prob *Problem, param *Parameter) *Model {
+	libLinearHookPrintFunc() // Sets up logging
 	return &Model{C.train(&prob.c_prob, &param.c_param)}
 }
 
diff --git a/linear_models/liblinear_print.go b/linear_models/liblinear_print.go
new file mode 100644
index 0000000..f472a77
--- /dev/null
+++ b/linear_models/liblinear_print.go
@@ -0,0 +1,27 @@
+// +build go1.2
+
+package linear_models
+
+/*
+#cgo LDFLAGS: -llinear
+#cgo CFLAGS:
+#include <linear.h>
+
+typedef void (*print_func)(char *);
+void golearn_liblinear_print_func_cgo(char *);
+*/
+import "C"
+
+import (
+	"fmt"
+	"unsafe"
+)
+
+//export libLinearPrintFunc
+func libLinearPrintFunc(str *C.char) {
+	fmt.Println(C.GoString(str))
+}
+
+func libLinearHookPrintFunc() {
+	C.set_print_string_function((C.print_func)(unsafe.Pointer(C.golearn_liblinear_print_func_cgo)))
+}
diff --git a/linear_models/liblinear_print_11.go b/linear_models/liblinear_print_11.go
new file mode 100644
index 0000000..92616ce
--- /dev/null
+++ b/linear_models/liblinear_print_11.go
@@ -0,0 +1,16 @@
+// +build go1.1
+// +build !go1.2
+// +build !go1.3
+
+package linear_models
+
+import "C"
+
+//export libLinearPrintFunc
+func libLinearPrintFunc(str *C.char) {
+	// Stubbed
+}
+
+func libLinearHookPrintFunc() {
+	// Stubbed
+}