1 //===-- Implementation of vprintf -------------------------------*- 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 #include "src/stdio/vprintf.h" 10 #include "src/__support/OSUtil/io.h" 11 #include "src/__support/arg_list.h" 12 #include "src/__support/macros/config.h" 13 #include "src/stdio/printf_core/core_structs.h" 14 #include "src/stdio/printf_core/printf_main.h" 15 #include "src/stdio/printf_core/writer.h" 16 17 #include <stdarg.h> 18 #include <stddef.h> 19 20 namespace LIBC_NAMESPACE_DECL { 21 22 namespace { 23 24 LIBC_INLINE int raw_write_hook(cpp::string_view new_str, void *) { 25 write_to_stderr(new_str); 26 return printf_core::WRITE_OK; 27 } 28 29 } // namespace 30 31 LLVM_LIBC_FUNCTION(int, vprintf, 32 (const char *__restrict format, va_list vlist)) { 33 internal::ArgList args(vlist); // This holder class allows for easier copying 34 // and pointer semantics, as well as handling 35 // destruction automatically. 36 constexpr size_t BUFF_SIZE = 1024; 37 char buffer[BUFF_SIZE]; 38 39 printf_core::WriteBuffer wb(buffer, BUFF_SIZE, &raw_write_hook, nullptr); 40 printf_core::Writer writer(&wb); 41 42 int retval = printf_core::printf_main(&writer, format, args); 43 44 int flushval = wb.overflow_write(""); 45 if (flushval != printf_core::WRITE_OK) 46 retval = flushval; 47 48 return retval; 49 } 50 51 } // namespace LIBC_NAMESPACE_DECL 52