1 files changed, 84 insertions, 0 deletions
diff --git a/lib/system/vasprintf.c b/lib/system/vasprintf.c
new file mode 100644
index 0000000000..8362942a20
--- /dev/null
+++ b/lib/system/vasprintf.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright © 2008-2014 Intel Corporation.
+ *
+ * Authors: David Woodhouse <dwmw2@infradead.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * version 2.1, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <stdarg.h>
+#include "vasprintf.h"
+
+#ifndef HAVE_VASPRINTF
+
+int _gnutls_vasprintf(char **strp, const char *fmt, va_list ap)
+{
+	va_list ap2;
+	char *res = NULL;
+	int len = 160, len2;
+	int ret = 0;
+	int errno_save = -ENOMEM;
+
+	res = malloc(160);
+	if (!res)
+		goto err;
+
+	/* Use a copy of 'ap', preserving it in case we need to retry into
+	   a larger buffer. 160 characters should be sufficient for most
+	   strings in openconnect. */
+#ifdef HAVE_VA_COPY
+	va_copy(ap2, ap);
+#elif defined(HAVE___VA_COPY)
+	__va_copy(ap2, ap);
+#else
+#error No va_copy()!
+	/* You could try this. */
+	ap2 = ap;
+	/* Or this */
+	*ap2 = *ap;
+#endif
+	len = vsnprintf(res, 160, fmt, ap2);
+	va_end(ap2);
+
+	if (len < 0) {
+	printf_err:
+		errno_save = errno;
+		free(res);
+		res = NULL;
+		goto err;
+	}
+	if (len >= 0 && len < 160)
+		goto out;
+
+	free(res);
+	res = malloc(len+1);
+	if (!res)
+		goto err;
+
+	len2 = vsnprintf(res, len+1, fmt, ap);
+	if (len2 < 0 || len2 > len)
+		goto printf_err;
+
+	ret = 0;
+	goto out;
+
+ err:
+	errno = errno_save;
+	ret = -1;
+ out:
+	*strp = res;
+	return ret;
+}
+
+#endif