Mercurial > gnulib
view lib/backup-find.c @ 40212:8da9577294da
unistr/*, uniconv/*: Fix undefined behaviour.
Reported by Jeffrey Walton <noloader@gmail.com>.
* lib/unistr/u-cpy.h (FUNC): Don't invoke memcpy with a zero size.
* lib/unistr/u-cpy-alloc.h (FUNC): Likewise.
* lib/uniconv/u8-conv-from-enc.c (u8_conv_from_encoding): Likewise.
* lib/uniconv/u8-conv-to-enc.c (u8_conv_to_encoding): Likewise.
author | Bruno Haible <bruno@clisp.org> |
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date | Sat, 09 Mar 2019 00:01:47 +0100 |
parents | b06060465f09 |
children |
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/* backupfile.c -- make Emacs style backup file names Copyright 2017-2019 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/>. */ #include <config.h> #include "backup-internal.h" #include "argmatch.h" #include "xalloc.h" #include <stdlib.h> /* Relative to DIR_FD, return the name of a backup file for the existing file FILE, allocated with malloc. Report an error and exit if out of memory. Do not call this function if backup_type == no_backups. */ char * find_backup_file_name (int dir_fd, char const *file, enum backup_type backup_type) { char *result = backupfile_internal (dir_fd, file, backup_type, false); if (!result) xalloc_die (); return result; } static char const *const backup_args[] = { /* In a series of synonyms, present the most meaningful first, so that argmatch_valid be more readable. */ "none", "off", "simple", "never", "existing", "nil", "numbered", "t", NULL }; static const enum backup_type backup_types[] = { no_backups, no_backups, simple_backups, simple_backups, numbered_existing_backups, numbered_existing_backups, numbered_backups, numbered_backups }; /* Ensure that these two vectors have the same number of elements, not counting the final NULL in the first one. */ ARGMATCH_VERIFY (backup_args, backup_types); /* Return the type of backup specified by VERSION. If VERSION is NULL or the empty string, return numbered_existing_backups. If VERSION is invalid or ambiguous, fail with a diagnostic appropriate for the specified CONTEXT. Unambiguous abbreviations are accepted. */ enum backup_type get_version (char const *context, char const *version) { if (version == 0 || *version == 0) return numbered_existing_backups; else return XARGMATCH (context, version, backup_args, backup_types); } /* Return the type of backup specified by VERSION. If VERSION is NULL, use the value of the envvar VERSION_CONTROL. If the specified string is invalid or ambiguous, fail with a diagnostic appropriate for the specified CONTEXT. Unambiguous abbreviations are accepted. */ enum backup_type xget_version (char const *context, char const *version) { if (version && *version) return get_version (context, version); else return get_version ("$VERSION_CONTROL", getenv ("VERSION_CONTROL")); }