stdio-common/Xprintf_buffer_done.c

   1 /* Final status reporting for struct __*printf_buffer.  Generic version.
   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 #include <errno.h>
  20 #include <intprops.h>
  21 #include <stdint.h>
  22
  23 int
  24 Xprintf_buffer_done (struct Xprintf_buffer *buf)
  25 {
  26   if (Xprintf_buffer_has_failed (buf))
  27     return -1;
  28
  29   /* Use uintptr_t here because for sprintf, the buffer range may
  30      cover more than half of the address space.  */
  31   uintptr_t written_current = buf->write_ptr - buf->write_base;
  32   int written_total;
  33   if (INT_ADD_WRAPV (buf->written, written_current, &written_total))
  34     {
  35       __set_errno (EOVERFLOW);
  36       return -1;
  37     }
  38   else
  39     return written_total;
  40 }