mfbt/Sprintf.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 /* Provides a safer sprintf for printing to fixed-size character arrays. */
   8
   9 #ifndef mozilla_Sprintf_h_
  10 #define mozilla_Sprintf_h_
  11
  12 #include <stdio.h>
  13 #include <stdarg.h>
  14
  15 #include "mozilla/Assertions.h"
  16 #include "mozilla/Attributes.h"
  17
  18 #ifdef __cplusplus
  19
  20 template <size_t N>
  21 MOZ_FORMAT_PRINTF(2, 0)
  22 int VsprintfLiteral(char (&buffer)[N], const char* format, va_list args) {
  23   MOZ_ASSERT(format != buffer);
  24   int result = vsnprintf(buffer, N, format, args);
  25   buffer[N - 1] = '\0';
  26   return result;
  27 }
  28
  29 template <size_t N>
  30 MOZ_FORMAT_PRINTF(2, 3)
  31 int SprintfLiteral(char (&buffer)[N], const char* format, ...) {
  32   va_list args;
  33   va_start(args, format);
  34   int result = VsprintfLiteral(buffer, format, args);
  35   va_end(args);
  36   return result;
  37 }
  38
  39 #endif
  40 #endif /* mozilla_Sprintf_h_ */