From: Sam Moore <matches@ucc.asn.au>
Date: Fri, 4 Jul 2014 05:09:47 +0000 (+0800)
Subject: Moronic bug identified, also Backtrace is a thing now
X-Git-Url: https://git.ucc.asn.au/?p=ipdf%2Fcode.git;a=commitdiff_plain;h=e7e4a7ad5c977ae089bab7081e7931fd5e423cc1

Moronic bug identified, also Backtrace is a thing now

Copy/Paste bug @rational.h:123

At least division and addition both involve maths right?
---

diff --git a/.gitignore b/.gitignore
index 5041ffa..28b8762 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,8 @@
 *.err
 *.vcd
 *.bmp
+*.data
+*.geany
+*.dat
+bin/ipdf
+data/*
diff --git a/bin/ipdf b/bin/ipdf
deleted file mode 100755
index 03e79d7..0000000
Binary files a/bin/ipdf and /dev/null differ
diff --git a/src/Makefile b/src/Makefile
index 8ff6370..a26843f 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1,7 +1,7 @@
 #Makefile
 ARCH := $(shell uname -m)
 # TODO: stb_truetype doesn't compile with some of these warnings.
-CXX = g++ -std=gnu++0x -g -Wall -Werror -Wshadow -pedantic
+CXX = g++ -std=gnu++0x -g -Wall -Werror -Wshadow -pedantic -rdynamic
 MAIN = main.o
 OBJ = log.o real.o bezier.o document.o objectrenderer.o view.o screen.o vfpu.o graphicsbuffer.o framebuffer.o shaderprogram.o stb_truetype.o gl_core44.o
 LIB_x86_64 = ../contrib/lib/libSDL2-2.0.so.0 -lGL
diff --git a/src/log.cpp b/src/log.cpp
index 3af4aca..49b209a 100644
--- a/src/log.cpp
+++ b/src/log.cpp
@@ -10,6 +10,7 @@
 #include <cstdio>
 #include <unistd.h>
 #include <stdarg.h>
+#include <execinfo.h>
 
 #ifdef LOG_SYSLOG
 
@@ -139,3 +140,13 @@ void FatalEx(const char * funct, const char * file, int line, ...)
 }
 
 
+/**
+ * Print a backtrace
+ */
+void Backtrace(int size)
+{
+	void * buffer[100];
+	int actual_size = backtrace(buffer, size);
+	backtrace_symbols_fd(buffer, actual_size, fileno(stderr));
+}
+
diff --git a/src/log.h b/src/log.h
index fdf30a7..d49c149 100644
--- a/src/log.h
+++ b/src/log.h
@@ -37,6 +37,7 @@ inline std::string methodName(const std::string& prettyFunction)
 #define Debug(...) LogEx(LOG_DEBUG, __func__, __FILE__, __LINE__, __VA_ARGS__)
 #define Error(...) LogEx(LOG_ERR, __func__, __FILE__, __LINE__, __VA_ARGS__)
 #define Warn(...) LogEx(LOG_WARNING, __func__, __FILE__, __LINE__, __VA_ARGS__)
+extern void Backtrace(int size=10);
 
 
 extern void LogEx(int level, const char * funct, const char * file, int line,  ...); // General function for printing log messages to stderr
diff --git a/src/rational.h b/src/rational.h
index b3709ad..c2215a0 100644
--- a/src/rational.h
+++ b/src/rational.h
@@ -12,8 +12,7 @@
 namespace IPDF
 {
 
-/** Greatest Common Divisor - Euclid's algorithm **/
-
+/* Recursive version  of GCD
 template <class T>
 T gcd(const T & a, const T & b)
 {
@@ -24,12 +23,12 @@ T gcd(const T & a, const T & b)
 	if (a > b) return gcd(a-b,b);
 	return gcd(a, b-a);
 }
+*/
 
-/*
+/** Greatest Common Divisor of p and q **/
 template <class T>
 T gcd(const T & p, const T & q)
 {
-	Debug("p/q = %
 	T g(1);
 	T big(p);
 	T small(q);
@@ -47,15 +46,15 @@ T gcd(const T & p, const T & q)
 	}
 	return small;
 }	 
-*/
+
 template <class T = int64_t>
 struct Rational
 {
 	/** Construct from a double.**/
-	Rational(double d = 0) : P(d*1e3), Q(1e3) // Possibly the worst thing ever...
+	Rational(double d = 0) : P(d*1e6), Q(1e6) // Possibly the worst thing ever...
 	{
 		Simplify();
-		//CheckAccuracy(d, "Construct from double");
+		CheckAccuracy(d, "Construct from double");
 	}
 
 	Rational(const T & _P, const T & _Q) : P(_P), Q(_Q)
@@ -121,8 +120,8 @@ struct Rational
 	}
 	Rational operator/(const Rational & r) const 
 	{
-		Rational result = (r.P == 0) ? Rational(P,Q) : Rational(P*r.Q + r.P*Q, Q*r.Q);
-		if (!result.CheckAccuracy(ToDouble() / r.ToDouble(),"*"))
+		Rational result(P * r.Q, Q*r.P);
+		if (!result.CheckAccuracy(ToDouble() / r.ToDouble(),"/"))
 		{
 			Debug("This is %s (%f) and r is %s (%f)", Str().c_str(), ToDouble(), r.Str().c_str(), r.ToDouble());
 		}
@@ -141,7 +140,7 @@ struct Rational
 	Rational & operator/=(const Rational & r) {this->operator=(*this/r); return *this;}
 
 	double ToDouble() const {return (double)(P) / (double)(Q);}
-	bool CheckAccuracy(double d, const char * msg, double threshold = 1e-6) const
+	bool CheckAccuracy(double d, const char * msg, double threshold = 1e-3) const
 	{
 		double result = fabs(ToDouble() - d) / d;
 		if (result > threshold)