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63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
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/* Test feature wrapper for formatted 'vdprintf' 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 <stdarg.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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static int
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printf_under_test (const char *restrict fmt, ...)
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{
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va_list ap;
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int result;
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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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va_start (ap, fmt);
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result = vdprintf (STDOUT_FILENO, fmt, ap);
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va_end (ap);
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if (result < 0)
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{
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perror ("vdprintf");
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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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return result;
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}
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