Upgrade libpcap to 1.8.1 (Nmap-specific patches not yet applied)

libpcap/missing/win_snprintf.c

@@ -0,0 +1,31 @@
+#include <stdio.h>
+#include <stdarg.h>
+
+int
+pcap_vsnprintf(char *str, size_t str_size, const char *format, va_list args)
+{
+	int ret;
+
+	ret = _vsnprintf_s(str, str_size, _TRUNCATE, format, args);
+
+	/*
+	 * XXX - _vsnprintf() and _snprintf() do *not* guarantee
+	 * that str is null-terminated, but C99's vsnprintf()
+	 * and snprintf() do, and we want to offer C99 behavior,
+	 * so forcibly null-terminate the string.
+	 */
+	str[str_size - 1] = '\0';
+	return (ret);
+}
+
+int
+pcap_snprintf(char *str, size_t str_size, const char *format, ...)
+{
+	va_list args;
+	int ret;
+
+	va_start(args, format);
+	ret = pcap_vsnprintf(str, str_size, format, args);
+	va_end(args);
+	return (ret);
+}