Print at most the first 64 characters of invalid arguments.

sources/test-Z80.c

@@ -723,7 +723,7 @@ int main(int argc, char **argv)
 	{
 	zboolean all = Z_FALSE;
 	zuint32 tests_run = 0;
-	zusize maximum_search_path_size = 0, s;
+	zusize maximum_search_path_size = 0;
 	int i = 0, j;
 
 	/*--------------------------------------------.
@@ -843,6 +843,7 @@ int main(int argc, char **argv)
 
 		else if (string_is_option(argv[i], "-p", "--path"))
 			{
+			zusize s;
 			char **p;
 
 			if (++i == argc) goto incomplete_option;
@@ -997,10 +998,8 @@ int main(int argc, char **argv)
 	invalid = "I/O value";
 
 	invalid_argument:
-	if ((s = strcspn(argv[i], " \t\n\r\"'")) > 64) s = 64;
-
-	fprintf(stderr, "test-Z80: Invalid %s: '%.*s%s'\n",
-		invalid, (int)s, argv[i], argv[i][s] ? "..." : "");
+	fprintf(stderr, "test-Z80: Invalid %s: '%.64s%s'\n",
+		invalid, argv[i], strlen(argv[i]) > 64 ? "..." : "");
 
 	bad_syntax:
 	fputs("test-Z80: Type 'test-Z80 -h' for help.\n", stderr);