1 files changed, 42 insertions, 0 deletions
diff --git a/usr/klibc/setenv.c b/usr/klibc/setenv.c
new file mode 100644
index 0000000..45a7aad
--- /dev/null
+++ b/usr/klibc/setenv.c
@@ -0,0 +1,42 @@
+/*
+ * setenv.c
+ */
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "env.h"
+
+int setenv(const char *name, const char *val, int overwrite)
+{
+	const char *z;
+	char *s;
+	size_t l1, l2;
+
+	if (!name || !name[0]) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	l1 = 0;
+	for (z = name; *z; z++) {
+		l1++;
+		if (*z == '=') {
+			errno = EINVAL;
+			return -1;
+		}
+	}
+
+	l2 = strlen(val);
+
+	s = malloc(l1 + l2 + 2);
+	if (!s)
+		return -1;
+
+	memcpy(s, name, l1);
+	s[l1] = '=';
+	memcpy(s + l1 + 1, val, l2 + 1);
+
+	return __put_env(s, l1 + 1, overwrite);
+}