Apply and update 06-mingw-_synctex_error.diff

generators/poppler/synctex/patches/06-mingw-_synctex_error.diff

@@ -2,11 +2,11 @@ _vscprintf() is specific for MSVC; thus in _synctex_error(), for any other
 compiler on Windows, use _vsnprintf() and grow the buffer until necessary.
 
 Patch provided by Patrick Spendrin <ps_ml@gmx.de>.
-Index: synctex/synctex_parser_utils.c
-===================================================================
---- synctex.orig/synctex_parser_utils.c	2010-05-23 19:17:10.000000000 +0200
-+++ synctex/synctex_parser_utils.c	2010-05-23 19:17:33.000000000 +0200
-@@ -89,8 +89,26 @@
+diff --git a/generators/poppler/synctex/synctex_parser_utils.c b/generators/poppler/synctex/synctex_parser_utils.c
+index e85ca73..ef1645e 100644
+--- a/generators/poppler/synctex/synctex_parser_utils.c
++++ b/generators/poppler/synctex/synctex_parser_utils.c
+@@ -90,8 +90,26 @@ int _synctex_error(const char * reason,...) {
  		char *buff;
  		size_t len;
  		OutputDebugStringA("SyncTeX ERROR: ");

generators/poppler/synctex/synctex_parser_utils.c

@@ -90,8 +90,26 @@ int _synctex_error(const char * reason,...) {
 		char *buff;
 		size_t len;
 		OutputDebugStringA("SyncTeX ERROR: ");
+#	ifdef _MSC_VER
 		len = _vscprintf(reason, arg) + 1;
 		buff = (char*)malloc( len * sizeof(char) );
+#else  /* MinGW */
+		size_t buffersize = 1024;
+		size_t max_buffersize = 1024 * buffersize;
+		int result;
+		buff = (char*)malloc(buffersize * sizeof(char));
+		result = _vsnprintf(buff, buffersize - 1, reason, arg);
+		while(-1 == result && buffersize <= max_buffersize) {
+			buffersize = buffersize * 2;
+			buff = (char*)realloc(buff, buffersize * sizeof(char));
+			result = _vsnprintf(buff, buffersize - 1, reason, arg);
+		}
+		if(-1 == result) {
+			// could not make the buffer big enough or simply could not write to it
+			free(buff);
+			return -1;
+		}
+#endif
 		result = vsprintf(buff, reason, arg) +strlen("SyncTeX ERROR: ");
 		OutputDebugStringA(buff);
 		OutputDebugStringA("\n");