libc/src/stdio/printf.cpp

   1 //===-- Implementation of printf --------------------------------*- 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/printf.h"
  10
  11 #include "src/__support/File/file.h"
  12 #include "src/__support/arg_list.h"
  13 #include "src/stdio/printf_core/vfprintf_internal.h"
  14
  15 #include <stdarg.h>
  16 #include <stdio.h>
  17
  18 #ifndef LIBC_COPT_STDIO_USE_SYSTEM_FILE
  19 #define PRINTF_STDOUT LIBC_NAMESPACE::stdout
  20 #else // LIBC_COPT_STDIO_USE_SYSTEM_FILE
  21 #define PRINTF_STDOUT ::stdout
  22 #endif // LIBC_COPT_STDIO_USE_SYSTEM_FILE
  23
  24 namespace LIBC_NAMESPACE {
  25
  26 LLVM_LIBC_FUNCTION(int, printf, (const char *__restrict format, ...)) {
  27   va_list vlist;
  28   va_start(vlist, format);
  29   internal::ArgList args(vlist); // This holder class allows for easier copying
  30                                  // and pointer semantics, as well as handling
  31                                  // destruction automatically.
  32   va_end(vlist);
  33   int ret_val = printf_core::vfprintf_internal(
  34       reinterpret_cast<::FILE *>(PRINTF_STDOUT), format, args);
  35   return ret_val;
  36 }
  37
  38 } // namespace LIBC_NAMESPACE