add str util

util/CMakeLists.txt

@@ -8,6 +8,7 @@ target_sources(nf7util
     malloc.h
     refcnt.h
     signal.h
+    str.h
 )
 target_tests(nf7util
   array.test.c

util/str.h

@@ -0,0 +1,20 @@
+// No copyright
+#pragma once
+
+#include <stdint.h>
+#include <string.h>
+
+
+static inline bool nf7util_str_equal_str(
+    const uint8_t* a, uint64_t alen, const uint8_t* b, uint64_t blen) {
+  return
+      alen == blen &&
+      0 == strncmp((const char*) a, (const char*) b, alen);
+}
+
+static inline bool nf7util_str_equal_cstr(
+    const uint8_t* a, uint64_t alen, const uint8_t* b) {
+  return
+      alen == strlen((const char*) b) &&
+      0 == strncmp((const char*) a, (const char*) b, alen);
+}