stdio-common/printf_buffer_to_file.h

   1 /* Multibyte and wide printf buffers writing data to a FILE * stream.
   2    Copyright (C) 2022-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef PRINTF_BUFFER_TO_FILE_H
  20 #define PRINTF_BUFFER_TO_FILE_H
  21
  22 #include <bits/types/FILE.h>
  23 #include <printf_buffer.h>
  24
  25 struct __printf_buffer_to_file
  26 {
  27   struct __printf_buffer base;
  28   FILE *fp;
  29
  30   /* Staging buffer.  Used if fp does not have any available buffer
  31      space.  */
  32   char stage[PRINTF_BUFFER_SIZE_TO_FILE_STAGE];
  33 };
  34
  35 /* Initializes *BUF to write data to FP.  */
  36 void __printf_buffer_to_file_init (struct __printf_buffer_to_file *buf,
  37                                    FILE *fp) attribute_hidden;
  38
  39 /* Transfers any pending data in BUF to BUF->FP.  The return value
  40    follows the printf convention (number bytes written; or -1 for error).  */
  41 int __printf_buffer_to_file_done (struct __printf_buffer_to_file *buf)
  42   attribute_hidden;
  43
  44 /* Wide version below.  */
  45
  46 struct __wprintf_buffer_to_file
  47 {
  48   struct __wprintf_buffer base;
  49   FILE *fp;
  50   wchar_t stage[PRINTF_BUFFER_SIZE_TO_FILE_STAGE];
  51 };
  52 void __wprintf_buffer_to_file_init (struct __wprintf_buffer_to_file *buf,
  53                                     FILE *fp) attribute_hidden;
  54 int __wprintf_buffer_to_file_done (struct __wprintf_buffer_to_file *buf)
  55   attribute_hidden;
  56
  57 #endif /* PRINTF_BUFFER_TO_FILE_H */