1 files changed, 31 insertions, 0 deletions
diff --git a/src/env/setenv.c b/src/env/setenv.c
new file mode 100644
index 00000000..03e165c8
--- /dev/null
+++ b/src/env/setenv.c
@@ -0,0 +1,31 @@
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+int __putenv(char *s, int a);
+
+int setenv(const char *var, const char *value, int overwrite)
+{
+	char *s;
+	int l1, l2;
+
+	if (strchr(var, '=')) {
+		errno = EINVAL;
+		return -1;
+	}
+	if (!overwrite && getenv(var)) return 0;
+
+	l1 = strlen(var);
+	l2 = strlen(value);
+	s = malloc(l1+l2+2);
+	memcpy(s, var, l1);
+	s[l1] = '=';
+	memcpy(s+l1+1, value, l2);
+	s[l1+l2+1] = 0;
+	if (__putenv(s, 1)) {
+		free(s);
+		errno = ENOMEM;
+		return -1;
+	}
+	return 0;
+}