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  }