sprintf to snprintf conversion

Move out string operations to another file, and introduce a frontend
to snprintf for various situations.  This change is important for
catching and eliminating sprintf overflows, which are as of now many
times silently corrupting memory.

Signed-off-by: Dan Farina <drfarina@acm.org>
Signed-off-by: Peter van Hardenberg <pvh@heroku.com>

strutil.h

@@ -0,0 +1,19 @@
+/*
+ * strutil.h
+ *
+ * Copyright (c) Heroku, 2010
+ *
+ */
+
+#ifndef _STRUTIL_H_
+#define _STRUTIL_H_
+
+#define QUERY_STR_LEN	 8192
+#define MAXLEN		 80
+
+
+extern int xsnprintf(char *str, size_t size, const char *format, ...);
+extern int sqlquery_snprintf(char *str, const char *format, ...);
+extern int maxlen_snprintf(char *str, const char *format, ...);
+
+#endif	/* _STRUTIL_H_ */