1 files changed, 43 insertions, 0 deletions
diff --git a/lib/libpcap/libpcap/missing/win_snprintf.c b/lib/libpcap/libpcap/missing/win_snprintf.c
new file mode 100644
index 0000000..f422403
--- /dev/null
+++ b/lib/libpcap/libpcap/missing/win_snprintf.c
@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include <stdarg.h>
+
+#include "portability.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.
+	 *
+	 * We don't, however, offer C99 behavior for the return
+	 * value; _vsnprintf_s() returns -1, not the number of
+	 * characters that would have been put into the buffer
+	 * had it been large enough, if the string is truncated.
+	 * The only way to get that value is to use _vscprintf();
+	 * getting that count isn't worth the re-formatting.
+	 *
+	 * XXX - does _vsnprintf_s() return -1 on a formatting
+	 * error?
+	 */
+	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);
+}