fixes for MSVC non-standard C library

strcase => _stricmp
strncase => _strnicmp
strdup => _strdup
snprintf => _snprintf

a compliant snprintf() is supposed to be available
in MS Visual Studio 2015 and later

src/buttons.c

@@ -40,11 +40,8 @@
 #if !defined(_MSC_VER)
 #include <strings.h>
 #else
-#if (_MSC_VER >= 1400)
-#define strncasecmp _memicmp
-#else
-#define strncasecmp memicmp
-#endif
+#define strdup _strdup
+#define strncasecmp _strnicmp
 #endif
 #include <stdlib.h>
 #if !defined(__VBCC__) && !defined(_MSC_VER)

src/fileformats.c

@@ -53,6 +53,12 @@
 
 
 #include <stdlib.h>
+#if defined(_MSC_VER)
+#include <stdio.h>
+#if _MSC_VER < 1900
+#define snprintf _snprintf
+#endif
+#endif
 
 #include "errors.h"
 #include "global.h"

src/filesel.c

@@ -43,7 +43,10 @@
 #include <string.h>
 #ifdef _MSC_VER
 #include <stdio.h>
+#define strdup _strdup
+#if _MSC_VER < 1900
 #define snprintf _snprintf
+#endif
 #else
 #include <strings.h>
 #include <unistd.h>

src/help.c

@@ -27,7 +27,7 @@
 
 #if defined(__WIN32__) || defined(WIN32)
     #include <windows.h>
-#ifdef _MSC_VER
+#if defined(_MSC_VER) && _MSC_VER < 1900
 	#define snprintf _snprintf
 #endif
 #elif defined(__macosx__) || defined(__FreeBSD__)

src/init.c

@@ -35,7 +35,6 @@
 #endif
 
 #include <stdio.h>
-//#include <fcntl.h>
 #include <string.h>
 
 #if !defined(__VBCC__) && !defined(_MSC_VER)
@@ -58,10 +57,13 @@
 #ifdef GRAFX2_CATCHES_SIGNALS
   #include <signal.h>
 #endif
-#ifdef _MSC_VER
-#include <stdio.h>
+#if defined(_MSC_VER)
+#define strncasecmp _strnicmp
+#define strdup _strdup
+#if _MSC_VER < 1900
 #define snprintf _snprintf
 #endif
+#endif
 
 #include "buttons.h"
 #include "const.h"

src/loadsave.c

@@ -33,6 +33,12 @@
 #endif
 #if defined(WIN32)
 #include <windows.h>
+#if defined(_MSC_VER)
+#define strdup _strdup
+#if _MSC_VER < 1900
+#define snprintf _snprintf
+#endif
+#endif
 #endif
 #include <limits.h>
 #include <SDL_image.h>

src/readini.c

@@ -29,6 +29,9 @@
 #include <string.h>
 #include <stdlib.h>
 #include <ctype.h>
+#if defined(_MSC_VER)
+#define strdup _strdup
+#endif
 
 #include "const.h"
 #include "errors.h"

src/readline.c

@@ -60,8 +60,11 @@
 
 #ifdef _MSC_VER
 #include <stdio.h>
+#define strdup _strdup
+#if _MSC_VER < 1900
 #define snprintf _snprintf
 #endif
+#endif
 
 // Virtual keyboard is ON by default on these platforms:
 #if defined(__GP2X__) || defined(__WIZ__) || defined(__CAANOO__) || defined(GCWZERO)

src/struct.h

@@ -40,8 +40,12 @@
 
 // POSIX calls it strcasecmp, Windows uses stricmp... no ANSI standard.
 #ifdef WIN32
+#ifdef _MSC_VER
+    #define strcasecmp _stricmp
+#else
     #define strcasecmp stricmp
 #endif
+#endif
 
 // Definition of the base data types
 ///  8bit unsigned integer

src/text.c

@@ -52,8 +52,11 @@
 
 #ifdef _MSC_VER
 #include <stdio.h>
+#define strdup _strdup
+#if _MSC_VER < 1900
 #define snprintf _snprintf
 #endif
+#endif
 
 #include <SDL_image.h>
 #include "SFont.h"

src/windows.c

@@ -31,8 +31,10 @@
 
 #ifdef _MSC_VER
 #include <stdio.h>
+#if _MSC_VER < 1900
 #define snprintf _snprintf
 #endif
+#endif
 
 #include "windows.h"