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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "test/util/logging.h"
#include <errno.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
namespace gvisor {
namespace testing {
namespace {
// We implement this here instead of using test_util to avoid cyclic
// dependencies.
int Write(int fd, const char* buf, size_t size) {
size_t written = 0;
while (written < size) {
int res = write(fd, buf + written, size - written);
if (res < 0 && errno == EINTR) {
continue;
} else if (res <= 0) {
break;
}
written += res;
}
return static_cast<int>(written);
}
// Write 32-bit decimal number to fd.
int WriteNumber(int fd, uint32_t val) {
constexpr char kDigits[] = "0123456789";
constexpr int kBase = 10;
// 10 chars for 32-bit number in decimal, 1 char for the NUL-terminator.
constexpr int kBufferSize = 11;
char buf[kBufferSize];
// Convert the number to string.
char* s = buf + sizeof(buf) - 1;
size_t size = 0;
*s = '\0';
do {
s--;
size++;
*s = kDigits[val % kBase];
val /= kBase;
} while (val);
return Write(fd, s, size);
}
} // namespace
void CheckFailure(const char* cond, size_t cond_size, const char* msg,
size_t msg_size, bool include_errno) {
int saved_errno = errno;
constexpr char kCheckFailure[] = "Check failed: ";
Write(2, kCheckFailure, sizeof(kCheckFailure) - 1);
Write(2, cond, cond_size);
if (msg != nullptr) {
Write(2, ": ", 2);
Write(2, msg, msg_size);
}
if (include_errno) {
constexpr char kErrnoMessage[] = " (errno ";
Write(2, kErrnoMessage, sizeof(kErrnoMessage) - 1);
WriteNumber(2, saved_errno);
Write(2, ")", 1);
}
Write(2, "\n", 1);
abort();
}
} // namespace testing
} // namespace gvisor
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