libc/src/stdio/sprintf.cpp

   1 //===-- Implementation of sprintf -------------------------------*- 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/sprintf.h"
  10
  11 #include "src/__support/CPP/limits.h"
  12 #include "src/__support/arg_list.h"
  13 #include "src/stdio/printf_core/printf_main.h"
  14 #include "src/stdio/printf_core/writer.h"
  15
  16 #include <stdarg.h>
  17
  18 namespace LIBC_NAMESPACE {
  19
  20 LLVM_LIBC_FUNCTION(int, sprintf,
  21                    (char *__restrict buffer, const char *__restrict format,
  22                     ...)) {
  23   va_list vlist;
  24   va_start(vlist, format);
  25   internal::ArgList args(vlist); // This holder class allows for easier copying
  26                                  // and pointer semantics, as well as handling
  27                                  // destruction automatically.
  28   va_end(vlist);
  29
  30   printf_core::WriteBuffer wb(buffer, cpp::numeric_limits<size_t>::max());
  31   printf_core::Writer writer(&wb);
  32
  33   int ret_val = printf_core::printf_main(&writer, format, args);
  34   wb.buff[wb.buff_cur] = '\0';
  35   return ret_val;
  36 }
  37
  38 } // namespace LIBC_NAMESPACE