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-rw-r--r--vputenvf.c23
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);
+}