From 6c0a0cc29b00d0a58a3ee55a8a7e4909ebf3454c Mon Sep 17 00:00:00 2001
From: tomsmeding <tom.smeding@gmail.com>
Date: Fri, 30 Dec 2016 17:57:42 +0100
Subject: Use format strings for draw_text and log

---
 library.cpp                 | 42 ++++++++++++++++++++++++++++++++++++++++--
 library.h                   |  3 +++
 src/objects/obj_control.cpp |  7 +------
 3 files changed, 44 insertions(+), 8 deletions(-)

diff --git a/library.cpp b/library.cpp
index 29e50db..cee789e 100644
--- a/library.cpp
+++ b/library.cpp
@@ -1,4 +1,7 @@
+#define _GNU_SOURCE //vasprintf
 #include <iostream>
+#include <cstdarg>
+#include <cassert>
 #include "global.h"
 #include "library.h"
 #include "main.h"
@@ -6,10 +9,45 @@
 using namespace std;
 
 
+static void draw_text(int x,int y,const char *s,size_t len){
+	fl_draw(s,len,x,y);
+}
+
 void draw_text(int x,int y,const char *s){
-	fl_draw(s,x,y);
+	draw_text(x,y,s,strlen(s));
+}
+
+__attribute__((format (printf, 3, 4)))
+void draw_textf(int x,int y,const char *format,...){
+	va_list ap;
+	va_start(ap,format);
+	char *buf;
+	int len=vasprintf(&buf,format,ap);
+	va_end(ap);
+	assert(len>=0);
+	draw_text(x,y,buf,len);
+	free(buf);
+}
+
+
+static void log(const char *buf,size_t len){
+	cerr<<"[LOG] ";
+	cerr.write(buf,len);
+	cerr<<endl;
 }
 
 void log(const char *s){
-	cerr<<"[LOG] "<<s<<endl;
+	log(s,strlen(s));
+}
+
+__attribute__((format (printf, 1, 2)))
+void logf(const char *format,...){
+	va_list ap;
+	va_start(ap,format);
+	char *buf;
+	int len=vasprintf(&buf,format,ap);
+	va_end(ap);
+	assert(len>=0);
+	log(buf,len);
+	free(buf);
 }
diff --git a/library.h b/library.h
index 66cbde0..d078861 100644
--- a/library.h
+++ b/library.h
@@ -19,4 +19,7 @@ shared_ptr<Object> instance_create(int x,int y){
 }
 
 void draw_text(int x,int y,const char *s);
+void draw_textf(int x,int y,const char *format,...) __attribute__((format (printf, 3, 4)));
+
 void log(const char *s);
+void logf(const char *format,...) __attribute__((format (printf, 1, 2)));
diff --git a/src/objects/obj_control.cpp b/src/objects/obj_control.cpp
index 8f1a84b..6b6ab2c 100644
--- a/src/objects/obj_control.cpp
+++ b/src/objects/obj_control.cpp
@@ -3,8 +3,6 @@ OUT #include <cstdlib>
 
 double yd=0;
 
-double id(double a){return a;}
-
 EVENT(create){
 	x=10;
 	y=240;
@@ -20,8 +18,5 @@ EVENT(step){
 }
 
 EVENT(draw){
-	char *s;
-	asprintf(&s,"controllll: x=%g y=%g",id(x),id(y));
-	draw_text(x,y,s);
-	free(s);
+	draw_textf(x,y,"controllll: x=%g y=%g",x,y);
 }
-- 
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