1//===-- printf.h ------------------------------------------------*- C++ -*-===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8 9#ifndef GWP_ASAN_OPTIONAL_PRINTF_H_ 10#define GWP_ASAN_OPTIONAL_PRINTF_H_ 11 12namespace gwp_asan { 13 14// ================================ Requirements =============================== 15// This function is required to be provided by the supporting allocator iff the 16// allocator wants to use any of the optional components. 17// ================================ Description ================================ 18// This function shall produce output according to a strict subset of the C 19// standard library's printf() family. This function must support printing the 20// following formats: 21// 1. integers: "%([0-9]*)?(z|ll)?{d,u,x,X}" 22// 2. pointers: "%p" 23// 3. strings: "%[-]([0-9]*)?(\\.\\*)?s" 24// 4. chars: "%c" 25// This function must be implemented in a signal-safe manner, and thus must not 26// malloc(). 27// =================================== Notes =================================== 28// This function has a slightly different signature than the C standard 29// library's printf(). Notably, it returns 'void' rather than 'int'. 30typedef void (*Printf_t)(const char *Format, ...); 31 32} // namespace gwp_asan 33#endif // GWP_ASAN_OPTIONAL_PRINTF_H_ 34