mirror of https://github.com/sudo-project/sudo.git
49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 2020 Todd C. Miller <Todd.Miller@sudo.ws>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* This is an open source non-commercial project. Dear PVS-Studio, please check it.
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* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
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*/
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#include <config.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sudo_compat.h>
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#if !defined(HAVE_PREAD) && !defined(HAVE_PREAD64)
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ssize_t
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sudo_pread(int fd, void *buf, size_t nbytes, off_t offset)
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{
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ssize_t nread;
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off_t old_offset;
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old_offset = lseek(fd, (off_t)0, SEEK_CUR);
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if (old_offset == -1 || lseek(fd, offset, SEEK_SET) == -1)
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return -1;
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nread = read(fd, buf, nbytes);
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if (lseek(fd, old_offset, SEEK_SET) == -1)
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return -1;
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return nread;
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}
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#endif /* !HAVE_PREAD && !HAVE_PREAD64 */
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