libc/src/stdio/generic/fputs.cpp

   1 //===-- Implementation of fputs -------------------------------------------===//
   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/fputs.h"
  10 #include "src/__support/CPP/string_view.h"
  11 #include "src/__support/File/file.h"
  12
  13 #include "hdr/types/FILE.h"
  14 #include "src/__support/macros/config.h"
  15 #include "src/errno/libc_errno.h"
  16 #include <stddef.h>
  17
  18 namespace LIBC_NAMESPACE_DECL {
  19
  20 LLVM_LIBC_FUNCTION(int, fputs,
  21                    (const char *__restrict str, ::FILE *__restrict stream)) {
  22   cpp::string_view str_view(str);
  23
  24   auto result = reinterpret_cast<LIBC_NAMESPACE::File *>(stream)->write(
  25       str, str_view.size());
  26   if (result.has_error())
  27     libc_errno = result.error;
  28   size_t written = result.value;
  29
  30   if (str_view.size() != written) {
  31     // The stream should be in an error state in this case.
  32     return EOF;
  33   }
  34   return 0;
  35 }
  36
  37 } // namespace LIBC_NAMESPACE_DECL