Make snprintf/vsnprintf more compatible with the C standard on MSVC.

git-svn-id: svn://svn.code.sf.net/p/sc2/code/trunk@3361 8092fc87-c524-0410-9efc-e669fe64eaf9

sc2/src/port.c

@@ -24,6 +24,10 @@
 
 #include <ctype.h>
 #include <errno.h>
+#ifdef _MSC_VER
+#	include <stdarg.h>
+#	include <stdio.h>
+#endif  /* _MSC_VER */
 #include <stdlib.h>
 #include <string.h>
 #if !defined (_MSC_VER) && !defined (HAVE_READDIR_R)
@@ -110,3 +114,32 @@ readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result) {
 }
 #endif
 
+#ifdef _MSC_VER
+// MSVC does not have snprintf() and vsnprintf(). It does have a _snprintf()
+// and _vsnprintf(), but these do not terminate a truncated string as
+// the C standard prescribes.
+int
+snprintf(char *str, size_t size, const char *format, ...)
+{
+	int result;
+	va_list args;
+	
+	va_start (args, format);
+	result = _vsnprintf (str, size, format, args);
+	if (str != NULL && size != 0)
+		str[size - 1] = '\0';
+	va_end (args);
+
+	return result;
+}
+
+int
+vsnprintf(char *str, size_t size, const char *format, va_list args)
+{
+	int result = _vsnprintf (str, size, format, args);
+	if (str != NULL && size != 0)
+		str[size - 1] = '\0';
+	return result;
+}
+#endif  /* _MSC_VER */
+