Mercurial > gnulib
view lib/symlinkat.c @ 40214:452ab00796c7
Fix undefined behaviour.
* lib/bitrotate.h (rotl16, rotr16, rotl8, rotr8): Case x to
'unsigned int', to avoid shift operations on 'int'.
* lib/xmemdup0.c (xmemdup0): Don't invoke memcpy with a zero size.
* tests/test-count-leading-zeros.c (main): Use a random number that has
as many bits as TYPE, not only 2*15 or 2*31 bits.
* tests/test-count-trailing-zeros.c (main): Likewise.
* tests/test-count-one-bits.c (main): Likewise.
* tests/test-memmem.c: Don't include "null-ptr.h".
(main): Use zerosize_ptr() instead of null_ptr().
* modules/memmem-tests (Files): Remove tests/null-ptr.h.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sat, 09 Mar 2019 20:32:25 +0100 |
parents | b06060465f09 |
children |
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/* Create a symlink relative to an open directory. Copyright (C) 2009-2019 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. */ /* written by Eric Blake */ #include <config.h> #include <unistd.h> #include <errno.h> #if HAVE_SYMLINKAT # undef symlinkat #include <sys/stat.h> #include <string.h> /* Create a symlink, but reject trailing slash. */ int rpl_symlinkat (char const *contents, int fd, char const *name) { size_t len = strlen (name); if (len && name[len - 1] == '/') { struct stat st; if (fstatat (fd, name, &st, 0) == 0) errno = EEXIST; return -1; } return symlinkat (contents, fd, name); } #elif !HAVE_SYMLINK /* Mingw lacks symlink, and it is more efficient to provide a trivial wrapper than to go through at-func.c to call rpl_symlink. */ int symlinkat (char const *path1 _GL_UNUSED, int fd _GL_UNUSED, char const *path2 _GL_UNUSED) { errno = ENOSYS; return -1; } #else /* HAVE_SYMLINK */ /* Our openat helper functions expect the directory parameter first, not second. These shims make life easier. */ /* Like symlink, but with arguments reversed. */ static int symlink_reversed (char const *file, char const *contents) { return symlink (contents, file); } /* Like symlinkat, but with arguments reversed. */ static int symlinkat_reversed (int fd, char const *file, char const *contents); # define AT_FUNC_NAME symlinkat_reversed # define AT_FUNC_F1 symlink_reversed # define AT_FUNC_POST_FILE_PARAM_DECLS , char const *contents # define AT_FUNC_POST_FILE_ARGS , contents # include "at-func.c" # undef AT_FUNC_NAME # undef AT_FUNC_F1 # undef AT_FUNC_POST_FILE_PARAM_DECLS # undef AT_FUNC_POST_FILE_ARGS /* Create a symlink FILE, in the directory open on descriptor FD, holding CONTENTS. If possible, do it without changing the working directory. Otherwise, resort to using save_cwd/fchdir, then symlink/restore_cwd. If either the save_cwd or the restore_cwd fails, then give a diagnostic and exit nonzero. */ int symlinkat (char const *contents, int fd, char const *file) { return symlinkat_reversed (fd, file, contents); } #endif /* HAVE_SYMLINK */