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59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
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/* Test feature wrapper for formatted 'dprintf' output.
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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/* We need to go through the POSIX-mandated dance to switch between
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handles on an open file description. */
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#define printf_under_test(...) \
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({ \
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__label__ out; \
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int result; \
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\
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result = fflush (stdout); \
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if (result == EOF) \
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{ \
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perror ("fflush"); \
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goto out; \
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} \
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result = lseek (STDOUT_FILENO, 0, SEEK_END); \
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if (result < 0 && errno == ESPIPE) \
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result = 0; \
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if (result < 0) \
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{ \
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perror ("lseek"); \
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goto out; \
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} \
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result = dprintf (STDOUT_FILENO, __VA_ARGS__); \
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if (result < 0) \
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{ \
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perror ("dprintf"); \
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goto out; \
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} \
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result = fseek (stdout, 0, SEEK_END); \
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if (result < 0 && errno == ESPIPE) \
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result = 0; \
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if (result < 0) \
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perror ("fseek"); \
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out: \
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result; \
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})
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