зеркало из https://github.com/mozilla/gecko-dev.git
99 строки
2.5 KiB
C++
99 строки
2.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* Provides a safer sprintf for printing to fixed-size character arrays. */
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#ifndef mozilla_Sprintf_h_
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#define mozilla_Sprintf_h_
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#include <stdio.h>
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#include <stdarg.h>
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#include <algorithm>
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#include "mozilla/Assertions.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/Printf.h"
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#ifdef __cplusplus
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# ifndef SPRINTF_H_USES_VSNPRINTF
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namespace mozilla {
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namespace detail {
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struct MOZ_STACK_CLASS SprintfAppend final : public mozilla::PrintfTarget {
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explicit SprintfAppend(char* aBuf, size_t aBufLen)
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: mBuf(aBuf), mBufLen(aBufLen) {}
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bool append(const char* aStr, size_t aLen) override {
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if (aLen == 0) {
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return true;
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}
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// Don't copy more than what's left to use.
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size_t copy = std::min(mBufLen, aLen);
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if (copy > 0) {
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memcpy(mBuf, aStr, copy);
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mBuf += copy;
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mBufLen -= copy;
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}
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return true;
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}
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private:
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char* mBuf;
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size_t mBufLen;
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};
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} // namespace detail
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} // namespace mozilla
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# endif // SPRINTF_H_USES_VSNPRINTF
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MOZ_FORMAT_PRINTF(3, 0)
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MOZ_MAYBE_UNUSED
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static int VsprintfBuf(char* buffer, size_t bufsize, const char* format,
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va_list args) {
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MOZ_ASSERT(format != buffer);
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# ifdef SPRINTF_H_USES_VSNPRINTF
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int result = vsnprintf(buffer, bufsize, format, args);
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buffer[bufsize - 1] = '\0';
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return result;
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# else
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mozilla::detail::SprintfAppend ss(buffer, bufsize);
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ss.vprint(format, args);
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size_t len = ss.emitted();
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buffer[std::min(len, bufsize - 1)] = '\0';
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return len;
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# endif
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}
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MOZ_FORMAT_PRINTF(3, 4)
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MOZ_MAYBE_UNUSED
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static int SprintfBuf(char* buffer, size_t bufsize, const char* format, ...) {
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va_list args;
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va_start(args, format);
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int result = VsprintfBuf(buffer, bufsize, format, args);
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va_end(args);
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return result;
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}
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template <size_t N>
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MOZ_FORMAT_PRINTF(2, 0)
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int VsprintfLiteral(char (&buffer)[N], const char* format, va_list args) {
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return VsprintfBuf(buffer, N, format, args);
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}
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template <size_t N>
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MOZ_FORMAT_PRINTF(2, 3)
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int SprintfLiteral(char (&buffer)[N], const char* format, ...) {
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va_list args;
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va_start(args, format);
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int result = VsprintfLiteral(buffer, format, args);
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va_end(args);
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return result;
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}
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#endif
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#endif /* mozilla_Sprintf_h_ */
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