Port to musl libc

Closes nillerusr#72 and uses some patches from nillerusr#193 for better portability
between UNIXes.

Also this patch replaces so many NULLs with 0 or '\0' because musl
headers redefines it and anyway it is better practice.

Moreover, due to very "cool" code from Valve, some modules comes with
disabled fortify which distributes with build-base in Alpine
(fortify is something like compile-time checking for memory bounds)

Author: er2off

appframework/sdlmgr.cpp

@@ -270,7 +270,7 @@ class CSDLMgr : public ILauncherMgr
 
 	// Get the next N events. The function returns the number of events that were filled into your array.
 	virtual int GetEvents( CCocoaEvent *pEvents, int nMaxEventsToReturn, bool debugEvents = false );
-#if defined(LINUX) || defined(PLATFORM_BSD)
+#if defined(POSIX) && !defined(OSX)
 	virtual int PeekAndRemoveKeyboardEvents( bool *pbEsc, bool *pbReturn, bool *pbSpace, bool debugEvent = false );
 #endif
 
@@ -1004,7 +1004,7 @@ int CSDLMgr::GetEvents( CCocoaEvent *pEvents, int nMaxEventsToReturn, bool debug
 	return nToWrite;
 }
 
-#if defined(LINUX) || defined(PLATFORM_BSD)
+#if defined(POSIX) && !defined(OSX)
 
 int CSDLMgr::PeekAndRemoveKeyboardEvents( bool *pbEsc, bool *pbReturn, bool *pbSpace, bool debugEvent )
 {

appframework/wscript

@@ -37,6 +37,7 @@ def build(bld):
 
 	includes = [
 		'.',
+		'../common',
 		'../public',
 		'../public/tier0',
 		'../public/tier1'

common/freetype/config/ftconfig.h

@@ -3,8 +3,6 @@
 
 #ifdef ANDROID
 #include <sys/cdefs.h>
-#elif defined(OSX) || defined(PLATFORM_BSD)
-#include <stdint.h>
 #else
 #include <bits/wordsize.h>
 #endif

common/vgui_surfacelib/FontManager.h

@@ -12,7 +12,7 @@
 #endif
 
 #include <vgui/VGUI.h>
-#include "vgui_surfacelib/FontAmalgam.h"
+#include "common/vgui_surfacelib/FontAmalgam.h"
 #include "materialsystem/imaterialsystem.h"
 #include "filesystem.h"
 #include "vguifont.h"

engine/audio/snd_mix.cpp

@@ -1999,7 +1999,7 @@ void CChannelCullList::Initialize( CChannelList &list )
 		else
 		{
 			m_channelInfo[i].m_vol = -1;
-			m_channelInfo[i].m_nameHash = NULL; // doesn't matter
+			m_channelInfo[i].m_nameHash = 0; // doesn't matter
 		}
 	}
 

engine/bugreporter.cpp

@@ -110,7 +110,7 @@
 #define BUG_REPOSITORY_URL "\\\\fileserver\\bugs"
 #elif defined(OSX)
 #define BUG_REPOSITORY_URL "/Volumes/bugs"
-#elif defined(LINUX) || defined(PLATFORM_BSD)
+#elif defined(POSIX)
 #define BUG_REPOSITORY_URL "\\\\fileserver\\bugs"
 #else
 //#error
@@ -2257,7 +2257,7 @@ void NonFileSystem_CreatePath (const char *path)
 	}
 }
 
-#if defined(LINUX) || defined(PLATFORM_BSD)
+#if defined(POSIX) && !defined(OSX)
 #define COPYFILE_ALL 0
 #define BSIZE 65535
 int copyfile( const char *local, const char *remote, void *ignored, int ignoredFlags )

engine/disp_interface.cpp

@@ -1298,7 +1298,7 @@ int DispInfo_ComputeIndex( HDISPINFOARRAY hArray, IDispInfo* pInfo )
 {
 	CDispArray *pArray = static_cast<CDispArray*>( hArray );
 	if( !pArray )
-		return NULL;
+		return 0;
 
 	intp iElement = ((intp)pInfo - (intp)(pArray->m_pDispInfos)) / sizeof(CDispInfo);
 

engine/disp_mapload.cpp

@@ -801,7 +801,7 @@ CDispInfo::CDispInfo()
 
 	m_pMesh = NULL;
 
-	m_Tag = NULL;
+	m_Tag = 0;
 	m_pDispArray = NULL;
 
 	m_FirstDecal = DISP_DECAL_HANDLE_INVALID;

engine/downloadthread.cpp

@@ -587,12 +587,12 @@ static size_t curlHeaderFn( void *ptr, size_t size, size_t nmemb, void *stream)
 	char *pszValue = NULL;
 	RequestContext_t *pRC = (RequestContext_t *) stream;
 
-	pszHeader[ ( size * nmemb - 1 ) ] = NULL;
+	pszHeader[ ( size * nmemb - 1 ) ] = '\0';
 	pszValue = Q_strstr( pszHeader, ":" );
 	if ( pszValue )
 	{
 		// null terminate the header name, and point pszValue at it's value
-		*pszValue = NULL;
+		*pszValue = '\0';
 		pszValue++;
 		Q_StrTrim( pszValue );
 	}

engine/saverestore_filesystem.cpp

@@ -79,7 +79,7 @@ class CSaveDirectory
 			pBuffer = NULL; 
 			pCompressedBuffer = NULL;
 			nSize = 0;
-			nCompressedSize = NULL;
+			nCompressedSize = 0;
 		}