glibc/stdio-common/Xprintf_buffer_done.c

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/* Final status reporting for struct __*printf_buffer. Generic version.
Copyright (C) 2022-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <intprops.h>
#include <stdint.h>
int
Xprintf_buffer_done (struct Xprintf_buffer *buf)
{
if (Xprintf_buffer_has_failed (buf))
return -1;
/* Use uintptr_t here because for sprintf, the buffer range may
cover more than half of the address space. */
uintptr_t written_current = buf->write_ptr - buf->write_base;
int written_total;
if (INT_ADD_WRAPV (buf->written, written_current, &written_total))
{
__set_errno (EOVERFLOW);
return -1;
}
else
return written_total;
}