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/* Test feature wrapper for formatted 'dprintf' output.
Copyright (C) 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 <stdio.h>
#include <unistd.h>
/* We need to go through the POSIX-mandated dance to switch between
handles on an open file description. */
#define printf_under_test(...) \
({ \
__label__ out; \
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; \
} \
result = dprintf (STDOUT_FILENO, __VA_ARGS__); \
if (result < 0) \
{ \
perror ("dprintf"); \
goto out; \
} \
result = fseek (stdout, 0, SEEK_END); \
if (result < 0 && errno == ESPIPE) \
result = 0; \
if (result < 0) \
perror ("fseek"); \
out: \
result; \
})
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