1 files changed, 23 insertions, 0 deletions
diff --git a/vputenvf.c b/vputenvf.c
new file mode 100644
index 0000000..a197fb5
--- /dev/null
+++ b/vputenvf.c
@@ -0,0 +1,23 @@
+/* See LICENSE file for copyright and license details. */
+#include "libsimple.h"
+
+
+int
+vputenvf(const char *fmt, va_list ap)
+{
+	va_list ap2;
+	int n;
+	char *s;
+	va_copy(ap2, ap);
+	n = vsnprintf(NULL, 0, fmt, ap2);
+	va_end(ap2);
+	if (n < 0)
+		return -1;
+	if ((size_t)n == SIZE_MAX) {
+		errno = ENOMEM;
+		return -1;
+	}
+	s = alloca((size_t)n + 1);
+	vsprintf(s, fmt, ap);
+	return putenv(s);
+}