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45 lines
1.4 KiB
C
45 lines
1.4 KiB
C
/* Error-checking, allocating wrapper for readlink.
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Copyright (C) 2017-2018 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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<http://www.gnu.org/licenses/>. */
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#include <scratch_buffer.h>
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#include <support/check.h>
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#include <support/support.h>
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#include <xunistd.h>
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char *
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xreadlink (const char *path)
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{
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struct scratch_buffer buf;
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scratch_buffer_init (&buf);
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while (true)
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{
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ssize_t count = readlink (path, buf.data, buf.length);
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if (count < 0)
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FAIL_EXIT1 ("readlink (\"%s\"): %m", path);
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if (count < buf.length)
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{
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char *result = xstrndup (buf.data, count);
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scratch_buffer_free (&buf);
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return result;
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}
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if (!scratch_buffer_grow (&buf))
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FAIL_EXIT1 ("scratch_buffer_grow in xreadlink");
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}
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}
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