From 567772d535dd8fb2f5095a5582e3731aae4617e5 Mon Sep 17 00:00:00 2001
From: Mikael Agren <agrendev@gmail.com>
Date: Mon, 30 Jul 2018 13:56:36 +0200
Subject: [PATCH] Do not rely on atof() for version detection

Removes atof() in the AGI version detection. atof() is locale dependent.
If the user has a locale were the decimal point is something other than
'.' the version detection will fail.

On Linux this can be tested by running:
    LC_NUMERIC="sv_SE.UTF-8" AGIStudio
A 2.917 game will then be detected as a 2.0 game.
---
 src/agicommands.cpp | 20 ++++++++++----------
 src/agicommands.h   |  2 +-
 src/game.cpp        | 24 ++++++++++++------------
 src/game.h          |  4 ++--
 4 files changed, 25 insertions(+), 25 deletions(-)

diff --git a/src/agicommands.cpp b/src/agicommands.cpp
index dbd9a0c..9aae03d 100644
--- a/src/agicommands.cpp
+++ b/src/agicommands.cpp
@@ -240,28 +240,28 @@ CommandStruct AGICommand[182] = {
 
 int NumAGICommands  = 181; // not counting return()
 
-void CorrectCommands(double VerNum)
+void CorrectCommands(long VerNum)
 {
-    if (VerNum <= 2.089) {
+    if (VerNum <= 2089000) {
         AGICommand[134].NumArgs = 0;  //quit
     }
-    if (VerNum < 2.400) {
+    if (VerNum < 2400000) {
         AGICommand[151].NumArgs = 3;  // print.at
         AGICommand[152].NumArgs = 3;  // print.at.v
     }
-    if (VerNum <= 3.002086)
+    if (VerNum <= 3002086)
         AGICommand[176].NumArgs = 1;
-    if (VerNum <= 2.089)
+    if (VerNum <= 2089000)
         NumAGICommands = 155;
-    else if (VerNum <= 2.272)
+    else if (VerNum <= 2272000)
         NumAGICommands = 161;
-    else if (VerNum <= 2.440)
+    else if (VerNum <= 2440000)
         NumAGICommands = 169;
-    else if (VerNum <= 2.917)
+    else if (VerNum <= 2917000)
         NumAGICommands = 173;
-    else if (VerNum <= 2.936)
+    else if (VerNum <= 2936000)
         NumAGICommands = 175;
-    else if (VerNum <= 3.002086)
+    else if (VerNum <= 3002086)
         NumAGICommands = 177;
     else
         NumAGICommands = 181;
diff --git a/src/agicommands.h b/src/agicommands.h
index ccc1e82..e62df61 100644
--- a/src/agicommands.h
+++ b/src/agicommands.h
@@ -48,6 +48,6 @@ extern CommandStruct TestCommand[19];  //tests for different flags, etc
 extern CommandStruct AGICommand[182];  //all the other
 
 
-extern void  CorrectCommands(double VerNum);
+extern void  CorrectCommands(long VerNum);
 
 #endif
diff --git a/src/game.cpp b/src/game.cpp
index 0ed5db6..0d10a3a 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -215,7 +215,7 @@ int Game::open(std::string name)
 
     if (!ErrorOccured) {
         AGIVersionNumber = GetAGIVersionNumber();
-        //printf("AGIVersion = %f\n",AGIVersionNumber);
+        //printf("AGIVersion = %lu\n",AGIVersionNumber);
         CorrectCommands(AGIVersionNumber);
         isOpen = true;
         make_source_dir();
@@ -388,7 +388,7 @@ int Game::newgame(std::string name)
     isOpen = true;
     isV3 = false;
     ID = "";
-    AGIVersionNumber = 2.917;
+    AGIVersionNumber = 2917000;
     for (int _i = 0; _i <= 3; _i++) {
         for (j = 0; j <= 255; j++)
             ResourceInfo[_i][j].Exists = false;
@@ -478,16 +478,15 @@ std::string Game::FindAGIV3GameID(const char *name)
 }
 
 //*******************************************************
-double Game::GetAGIVersionNumber(void)
+long Game::GetAGIVersionNumber(void)
 {
-    double VerNum;
     int ResPos, x;
     byte VerLen;
     bool ISVerNum;
-    char VerNumText[16];
+    long VerNum;
     std::string InFileName = dir + "/agidata.ovl";
     char VersionNumBuffer[] = "A_CDE_GHI";
-    double ret = 2.917;
+    int ret = 2917000;
     // This is what we use if we can't find the version number.
     // Version 2.917 is the most common interpreter and
     // the one that all the "new" AGI games should be based on.
@@ -532,14 +531,15 @@ double Game::GetAGIVersionNumber(void)
             } else
                 ISVerNum = false;
             if (VerLen > 0) {
+                VerNum = (VersionNumBuffer[0] - '0') * 1000000;
+                VerNum += (VersionNumBuffer[2] - '0') * 100000;
+                VerNum += (VersionNumBuffer[3] - '0') * 10000;
+                VerNum += (VersionNumBuffer[4] - '0') * 1000;
                 if (VersionNumBuffer[5] == '.') {
-                    strcpy(VerNumText, VersionNumBuffer);
-                    strcpy(VerNumText + 5, VersionNumBuffer + 6); // remove second .
-                } else {
-                    strncpy(VerNumText, VersionNumBuffer, VerLen);
-                    VerNumText[VerLen] = 0;
+                    VerNum += (VersionNumBuffer[6] - '0') * 100;
+                    VerNum += (VersionNumBuffer[7] - '0') * 10;
+                    VerNum += (VersionNumBuffer[8] - '0');
                 }
-                VerNum = atof(VerNumText);
                 if (VerNum != 0) {
                     ret = VerNum;
                     break;
diff --git a/src/game.h b/src/game.h
index a324004..11d0d6d 100644
--- a/src/game.h
+++ b/src/game.h
@@ -82,9 +82,9 @@ class Game
     std::string templatedir;  //template game directory
     std::string helpdir;      //help directory
 private:
-    double AGIVersionNumber;
+    long AGIVersionNumber;
     std::string FindAGIV3GameID(const char *name);
-    double GetAGIVersionNumber(void);
+    long GetAGIVersionNumber(void);
     int ReadV3Resource(char ResourceType, int ResourceID);
     FILE *OpenPatchVol(int PatchVol, int *filesize);
     FILE *OpenDirUpdate(int *dirsize, int ResType);