Add inline fls() function for linux

[project/netifd.git] / netifd.h

diff --git a/netifd.h b/netifd.h
index 160ea3b..77c8719 100644 (file)
--- a/netifd.h
+++ b/netifd.h
@@ -19,12 +19,46 @@
 #define DPRINTF(...) do {} while(0)
 #endif
 
+#define __init __attribute__((constructor))
+
 struct device;
 struct interface;
 
 extern struct uci_context *uci_ctx;
 extern bool config_init;
 
+int avl_strcmp(const void *k1, const void *k2, void *ptr);
 void config_init_interfaces(const char *name);
 
+#ifdef __linux__
+static inline int fls(int x)
+{
+    int r = 32;
+
+    if (!x)
+        return 0;
+    if (!(x & 0xffff0000u)) {
+        x <<= 16;
+        r -= 16;
+    }
+    if (!(x & 0xff000000u)) {
+        x <<= 8;
+        r -= 8;
+    }
+    if (!(x & 0xf0000000u)) {
+        x <<= 4;
+        r -= 4;
+    }
+    if (!(x & 0xc0000000u)) {
+        x <<= 2;
+        r -= 2;
+    }
+    if (!(x & 0x80000000u)) {
+        x <<= 1;
+        r -= 1;
+    }
+    return r;
+}
+#endif
+
 #endif