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83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
/* truncate emulations for native Windows.
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Copyright (C) 2017-2026 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3, or (at your option)
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any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, see <https://www.gnu.org/licenses/>. */
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/* If the user's config.h happens to include <unistd.h>, let it include only
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the system's <unistd.h> here, so that orig_faccessat doesn't recurse to
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rpl_faccessat. */
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#define _GL_INCLUDING_UNISTD_H
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#include <config.h>
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/* Get the original definition of truncate. */
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/stat.h>
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#undef _GL_INCLUDING_UNISTD_H
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#if TRUNCATE_TRAILING_SLASH_BUG
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static int
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orig_truncate (const char *filename, off_t length)
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{
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return truncate (filename, length);
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}
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#endif
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/* Specification. */
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#include <unistd.h>
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int
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truncate (const char *filename, off_t length)
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{
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#if TRUNCATE_TRAILING_SLASH_BUG
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/* Use the original truncate(), but correct the trailing slash handling. */
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size_t len = strlen (filename);
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if (len && filename[len - 1] == '/')
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{
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struct stat st;
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if (stat (filename, &st) == 0)
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errno = (S_ISDIR (st.st_mode) ? EISDIR : ENOTDIR);
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return -1;
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}
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return orig_truncate (filename, length);
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#else
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int fd;
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if (length == 0)
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{
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fd = open (filename, O_WRONLY | O_TRUNC | O_CLOEXEC);
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if (fd < 0)
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return -1;
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}
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else
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{
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fd = open (filename, O_WRONLY | O_CLOEXEC);
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if (fd < 0)
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return -1;
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if (ftruncate (fd, length) < 0)
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{
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int saved_errno = errno;
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close (fd);
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errno = saved_errno;
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return -1;
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}
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}
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close (fd);
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return 0;
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#endif
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}
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