Split a function out to minimal and forgot to commit it.

diff --git a/string.h b/string.h
new file mode 100644 (file)
index 0000000..c3a9724
--- /dev/null
+++ b/string.h
@@ -0,0 +1,7 @@
+char *strndup_(const char *src, int len) {
+    char *dst = malloc(len + 1);
+    _assert(dst != NULL);
+    strncpy(dst, src, len);
+    dst[len] = '\0';
+    return dst;
+}