now detect usb

1 files changed, 10 insertions, 0 deletions

diff --git a/common.h b/common.h
new file mode 100644
index 0000000..10fa22b
--- /dev/null
+++ b/common.h
@@ -0,0 +1,10 @@
+#define psizeof(a) (sizeof(a) / sizeof(*(a)))
+
+static inline void *memdup(void *src, size_t size) {
+  void *r = malloc(size);
+  memcpy(r, src, size);
+  return r;
+}
+static inline void ifree(void *p) {
+  if (p) { free(p); p = NULL; }
+}