Add build system scaffolding and libc headers

1 files changed, 17 insertions, 0 deletions

diff --git a/lib/libc/stdlib/putenv.c b/lib/libc/stdlib/putenv.c
new file mode 100644
index 00000000..b070cc4d
--- /dev/null
+++ b/lib/libc/stdlib/putenv.c
@@ -0,0 +1,17 @@
+#include <stdlib.h>
+#include <string.h>
+
+int putenv(char *string)
+{
+	const char *const name_end = strchr(string, '=');
+
+	if (name_end) {
+		char name[name_end - string + 1];
+		memcpy(name, string, name_end - string);
+		name[name_end - string] = '\0';
+		return setenv(name, name_end + 1, 1);
+	}
+
+	unsetenv(string);
+	return 0;
+}