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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// This file defines printf-like functions for working with span-based
// buffers.
#ifndef BASE_STRINGS_SPAN_PRINTF_H_
#define BASE_STRINGS_SPAN_PRINTF_H_
#include <stdarg.h> // va_list
#include "base/compiler_specific.h"
#include "base/containers/span.h"
#include "base/strings/string_util.h"
namespace base {
// We separate the declaration from the implementation of this inline
// function just so the PRINTF_FORMAT works.
PRINTF_FORMAT(2, 0)
inline int VSpanPrintf(base::span<char> buffer,
const char* format,
va_list arguments);
inline int VSpanPrintf(base::span<char> buffer,
const char* format,
va_list arguments) {
// SAFETY: buffer size obtained from span.
return UNSAFE_BUFFERS(
base::vsnprintf(buffer.data(), buffer.size(), format, arguments));
}
// We separate the declaration from the implementation of this inline
// function just so the PRINTF_FORMAT works.
PRINTF_FORMAT(2, 3)
inline int SpanPrintf(base::span<char> buffer, const char* format, ...);
inline int SpanPrintf(base::span<char> buffer, const char* format, ...) {
va_list arguments;
va_start(arguments, format);
int result = VSpanPrintf(buffer, format, arguments);
va_end(arguments);
return result;
}
} // namespace base
#endif // BASE_STRINGS_SPAN_PRINTF_H_
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