Source code

Revision control

Copy as Markdown

Other Tools

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#include "mozilla/IntegerPrintfMacros.h"
#include <cfloat>
#include <stdarg.h>
#include "js/Printf.h"
#include "jsapi-tests/tests.h"
static bool MOZ_FORMAT_PRINTF(2, 3)
print_one(const char* expect, const char* fmt, ...) {
va_list ap;
va_start(ap, fmt);
JS::UniqueChars output = JS_vsmprintf(fmt, ap);
return output && !strcmp(output.get(), expect);
static const char* zero() {
// gcc 9 is altogether too clever about detecting that this will always
// return nullptr. Do not replace 0x10 with 0x1; it will no longer work.
return uintptr_t(&zero) == 0x10 ? "never happens" : nullptr;
BEGIN_TEST(testPrintf) {
CHECK(print_one("23", "%d", 23));
CHECK(print_one("-1", "%d", -1));
CHECK(print_one("23", "%u", 23u));
CHECK(print_one("0x17", "0x%x", 23u));
CHECK(print_one("0xFF", "0x%X", 255u));
CHECK(print_one("027", "0%o", 23u));
CHECK(print_one("-1", "%hd", (short)-1));
// This could be expanded if need be, it's just convenient to do
// it this way.
if (sizeof(short) == 2) {
CHECK(print_one("8000", "%hx", (unsigned short)0x8000));
CHECK(print_one("0xf0f0", "0x%lx", 0xf0f0ul));
CHECK(print_one("0xF0F0", "0x%llX", 0xf0f0ull));
CHECK(print_one("27270", "%zu", (size_t)27270));
CHECK(print_one("27270", "%zu", (size_t)27270));
CHECK(print_one("hello", "he%so", "ll"));
CHECK(print_one("(null)", "%s", ::zero()));
CHECK(print_one("0", "%p", (char*)0));
CHECK(print_one("h", "%c", 'h'));
CHECK(print_one("1.500000", "%f", 1.5f));
CHECK(print_one("1.5", "%g", 1.5));
// Regression test for bug#1350097. The bug was an assertion
// failure caused by printing a very long floating point value.
print_one("ignore", "%lf", DBL_MAX);
CHECK(print_one("2727", "%" PRIu32, (uint32_t)2727));
CHECK(print_one("aa7", "%" PRIx32, (uint32_t)2727));
CHECK(print_one("2727", "%" PRIu64, (uint64_t)2727));
CHECK(print_one("aa7", "%" PRIx64, (uint64_t)2727));
return true;