84 lines
2.8 KiB
C
84 lines
2.8 KiB
C
/* Create a file.
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Copyright (C) 2007-2025 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* If the user's config.h happens to include <fcntl.h>, let it include only
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the system's <fcntl.h> here, so that orig_creat doesn't recurse to
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rpl_creat. */
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#define __need_system_fcntl_h
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#include <config.h>
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/* Get the original definition of creat. It might be defined as a macro. */
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#include <fcntl.h>
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#include <sys/types.h>
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#undef __need_system_fcntl_h
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static int
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orig_creat (const char *filename, mode_t mode)
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{
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#if defined _WIN32 && !defined __CYGWIN__
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return _creat (filename, mode);
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#else
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return creat (filename, mode);
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#endif
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}
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/* Specification. */
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#ifdef __osf__
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/* Write "fcntl.h" here, not <fcntl.h>, otherwise OSF/1 5.1 DTK cc eliminates
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this include because of the preliminary #include <fcntl.h> above. */
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# include "fcntl.h"
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#else
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# include <fcntl.h>
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#endif
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#include <errno.h>
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#include <string.h>
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#include <sys/types.h>
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int
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creat (const char *filename, mode_t mode)
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{
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#if OPEN_TRAILING_SLASH_BUG
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/* Fail if the filename ends in a slash,
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as POSIX says such a filename must name a directory
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<https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap04.html#tag_04_13>:
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"A pathname that contains at least one non-<slash> character and that
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ends with one or more trailing <slash> characters shall not be resolved
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successfully unless the last pathname component before the trailing
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<slash> characters names an existing directory"
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creat() is defined as being equivalent to open() with flags
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O_CREAT | O_TRUNC | O_WRONLY. Therefore:
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If the named file already exists as a directory, then creat() must fail
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with errno = EISDIR.
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If the named file does not exist or does not name a directory, then
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creat() must fail since creat() cannot create directories. */
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{
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size_t len = strlen (filename);
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if (len > 0 && filename[len - 1] == '/')
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{
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errno = EISDIR;
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return -1;
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}
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}
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#endif
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#if defined _WIN32 && !defined __CYGWIN__
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/* Remap the 'x' bits to the 'r' bits. */
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mode = (mode & ~0111) | ((mode & 0111) << 2);
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#endif
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return orig_creat (filename, mode);
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}
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