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/* Test feature wrapper for formatted 'vdprintf' output.
Copyright (C) 2024-2025 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 <stdarg.h>
#include <stdio.h>
#include <unistd.h>
/* We need to go through the POSIX-mandated dance to switch between
handles on an open file description. */
static int
printf_under_test (const char *restrict fmt, ...)
{
va_list ap;
int result;
result = fflush (stdout);
if (result == EOF)
{
perror ("fflush");
goto out;
}
result = lseek (STDOUT_FILENO, 0, SEEK_END);
if (result < 0 && errno == ESPIPE)
result = 0;
if (result < 0)
{
perror ("lseek");
goto out;
}
va_start (ap, fmt);
result = vdprintf (STDOUT_FILENO, fmt, ap);
va_end (ap);
if (result < 0)
{
perror ("vdprintf");
goto out;
}
result = fseek (stdout, 0, SEEK_END);
if (result < 0 && errno == ESPIPE)
result = 0;
if (result < 0)
perror ("fseek");
out:
return result;
}
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