Make matches_option() in cf-check sources more reusable

It's useful for all the cf-check commands that support options.

cf-check/dump.c

@@ -426,31 +426,6 @@ static int dump_dbs(Seq *const files, const dump_mode mode)
     return ret;
 }
 
-static bool matches_option(
-    const char *const supplied,
-    const char *const longopt,
-    const char *const shortopt)
-{
-    assert(supplied != NULL);
-    assert(shortopt != NULL);
-    assert(longopt != NULL);
-    assert(strlen(shortopt) == 2);
-    assert(strlen(longopt) >= 3);
-    assert(shortopt[0] == '-' && shortopt[1] != '-');
-    assert(longopt[0] == '-' && longopt[1] == '-' && longopt[2] != '-');
-
-    const size_t length = strlen(supplied);
-    if (length <= 1)
-    {
-        return false;
-    }
-    else if (length == 2)
-    {
-        return StringSafeEqual(supplied, shortopt);
-    }
-    return StringSafeEqualN_IgnoreCase(supplied, longopt, length);
-}
-
 int dump_main(int argc, const char *const *const argv)
 {
     assert(argv != NULL);

cf-check/utilities.c

@@ -32,3 +32,28 @@ Seq *argv_to_lmdb_files(
 
     return SeqFromArgv(argc - offset, argv + offset);
 }
+
+bool matches_option(
+    const char *const supplied,
+    const char *const longopt,
+    const char *const shortopt)
+{
+    assert(supplied != NULL);
+    assert(shortopt != NULL);
+    assert(longopt != NULL);
+    assert(strlen(shortopt) == 2);
+    assert(strlen(longopt) >= 3);
+    assert(shortopt[0] == '-' && shortopt[1] != '-');
+    assert(longopt[0] == '-' && longopt[1] == '-' && longopt[2] != '-');
+
+    const size_t length = strlen(supplied);
+    if (length <= 1)
+    {
+        return false;
+    }
+    else if (length == 2)
+    {
+        return StringSafeEqual(supplied, shortopt);
+    }
+    return StringSafeEqualN_IgnoreCase(supplied, longopt, length);
+}

cf-check/utilities.h

@@ -10,5 +10,9 @@ Seq *argv_to_seq(int argc, const char *const *argv);
 Seq *default_lmdb_files();
 
 Seq *argv_to_lmdb_files(int count, const char *const *files, size_t offset);
+bool matches_option(
+    const char *const supplied,
+    const char *const longopt,
+    const char *const shortopt);
 
 #endif