2019-11-15 17:05:07 +00:00
|
|
|
// Copyright 2019 The Pigweed Authors
|
|
|
|
//
|
|
|
|
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
|
2019-11-26 22:13:38 +00:00
|
|
|
// use this file except in compliance with the License. You may obtain a copy of
|
|
|
|
// the License at
|
2019-11-15 17:05:07 +00:00
|
|
|
//
|
|
|
|
// https://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
|
2019-11-26 22:13:38 +00:00
|
|
|
// License for the specific language governing permissions and limitations under
|
|
|
|
// the License.
|
2019-11-15 17:05:07 +00:00
|
|
|
|
|
|
|
#include "pw_string/format.h"
|
|
|
|
|
|
|
|
#include <cstdio>
|
|
|
|
|
|
|
|
namespace pw::string {
|
|
|
|
|
|
|
|
StatusWithSize Format(const span<char>& buffer, const char* format, ...) {
|
|
|
|
va_list args;
|
|
|
|
va_start(args, format);
|
2020-01-24 01:40:10 +00:00
|
|
|
const StatusWithSize result = FormatVaList(buffer, format, args);
|
2019-11-15 17:05:07 +00:00
|
|
|
va_end(args);
|
|
|
|
|
|
|
|
return result;
|
|
|
|
}
|
|
|
|
|
2020-01-24 01:40:10 +00:00
|
|
|
StatusWithSize FormatVaList(const span<char>& buffer,
|
|
|
|
const char* format,
|
|
|
|
va_list args) {
|
2019-11-15 17:05:07 +00:00
|
|
|
if (buffer.empty()) {
|
2020-02-13 19:25:10 +00:00
|
|
|
return StatusWithSize(Status::RESOURCE_EXHAUSTED);
|
2019-11-15 17:05:07 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
const int result = std::vsnprintf(buffer.data(), buffer.size(), format, args);
|
|
|
|
|
|
|
|
// If an error occurred, the number of characters written is unknown.
|
|
|
|
// Discard any output by terminating the buffer.
|
|
|
|
if (result < 0) {
|
|
|
|
buffer[0] = '\0';
|
2020-02-13 19:25:10 +00:00
|
|
|
return StatusWithSize(Status::INVALID_ARGUMENT);
|
2019-11-15 17:05:07 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// If result >= buffer.size(), the output was truncated and null-terminated.
|
|
|
|
if (static_cast<unsigned>(result) >= buffer.size()) {
|
|
|
|
return StatusWithSize(Status::RESOURCE_EXHAUSTED, buffer.size() - 1);
|
|
|
|
}
|
|
|
|
|
|
|
|
return StatusWithSize(result);
|
|
|
|
}
|
|
|
|
|
|
|
|
} // namespace pw::string
|