From 9b1b0c574322c0e27ab281a1aeff5499df637048 Mon Sep 17 00:00:00 2001 From: Peter Hutterer Date: Tue, 16 Jun 2020 10:34:07 +1000 Subject: Add a snprintf_safe() helper function Returns true on success or false on error _or_ truncation. Since truncation is almost always an error anyway, we might as well make this easier to check. Signed-off-by: Peter Hutterer --- test/utils.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 test/utils.c (limited to 'test') diff --git a/test/utils.c b/test/utils.c new file mode 100644 index 0000000..a385a78 --- /dev/null +++ b/test/utils.c @@ -0,0 +1,50 @@ +/* + * Copyright © 2019 Red Hat, Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ + +#include "config.h" + +#include +#include +#include +#include + +#include "test.h" +#include "utils.h" + +int +main(void) +{ + char buffer[10]; + + assert(!snprintf_safe(buffer, 0, "foo")); + assert(!snprintf_safe(buffer, 1, "foo")); + assert(!snprintf_safe(buffer, 3, "foo")); + + assert(snprintf_safe(buffer, 10, "foo")); + assert(streq(buffer, "foo")); + + assert(!snprintf_safe(buffer, 10, "%s", "1234567890")); + assert(snprintf_safe(buffer, 10, "%s", "123456789")); + + return 0; +} -- cgit v1.2.1