/* backupfile.c -- make Emacs style backup file names
- Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+ Copyright (C) 1990-2006, 2009-2014 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ 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 2, or (at your option)
- any later version.
+ 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
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; see the file COPYING.
- If not, write to the Free Software Foundation,
- 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by Paul Eggert and David MacKenzie.
Some algorithms adapted from GNU Emacs. */
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
#include "backupfile.h"
#include <limits.h>
-#if HAVE_UNISTD_H
-# include <unistd.h>
-#endif
-
-#if HAVE_DIRENT_H
-# include <dirent.h>
-# define NLENGTH(direct) strlen ((direct)->d_name)
-#else
-# define dirent direct
-# define NLENGTH(direct) ((size_t) (direct)->d_namlen)
-# if HAVE_SYS_NDIR_H
-# include <sys/ndir.h>
-# endif
-# if HAVE_SYS_DIR_H
-# include <sys/dir.h>
-# endif
-# if HAVE_NDIR_H
-# include <ndir.h>
-# endif
-#endif
+#include <unistd.h>
-#if HAVE_DIRENT_H || HAVE_NDIR_H || HAVE_SYS_DIR_H || HAVE_SYS_NDIR_H
-# define HAVE_DIR 1
-#else
-# define HAVE_DIR 0
+#include "dirent--.h"
+#ifndef _D_EXACT_NAMLEN
+# define _D_EXACT_NAMLEN(dp) strlen ((dp)->d_name)
#endif
-
#if D_INO_IN_DIRENT
# define REAL_DIR_ENTRY(dp) ((dp)->d_ino != 0)
#else
#endif
/* ISDIGIT differs from isdigit, as follows:
- - Its arg may be any int or unsigned int; it need not be an unsigned char.
- - It's guaranteed to evaluate its argument exactly once.
+ - Its arg may be any int or unsigned int; it need not be an unsigned char
+ or EOF.
- It's typically faster.
POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to
- ISDIGIT_LOCALE unless it's important to use the locale's definition
- of `digit' even when the host does not conform to POSIX. */
+ ISDIGIT unless it's important to use the locale's definition
+ of "digit" even when the host does not conform to POSIX. */
#define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
/* The extension added to file names to produce a simple (as opposed
char const *simple_backup_suffix = "~";
-/* If FILENAME (which was of length FILELEN before an extension was
+/* If FILE (which was of length FILELEN before an extension was
appended to it) is too long, replace the extension with the single
char E. If the result is still too long, remove the char just
before E. */
static void
-check_extension (char *filename, size_t filelen, char e)
+check_extension (char *file, size_t filelen, char e)
{
- char *basename = base_name (filename);
- size_t baselen = base_len (basename);
+ char *base = last_component (file);
+ size_t baselen = base_len (base);
size_t baselen_max = HAVE_LONG_FILE_NAMES ? 255 : NAME_MAX_MINIMUM;
if (HAVE_DOS_FILE_NAMES || NAME_MAX_MINIMUM < baselen)
long name_max;
/* Temporarily modify the buffer into its parent directory name,
- invoke pathconf on the directory, and then restore the buffer. */
+ invoke pathconf on the directory, and then restore the buffer. */
char tmp[sizeof "."];
- memcpy (tmp, basename, sizeof ".");
- strcpy (basename, ".");
+ memcpy (tmp, base, sizeof ".");
+ strcpy (base, ".");
errno = 0;
- name_max = pathconf (filename, _PC_NAME_MAX);
+ name_max = pathconf (file, _PC_NAME_MAX);
if (0 <= name_max || errno == 0)
- {
- long size = baselen_max = name_max;
- if (name_max != size)
- baselen_max = SIZE_MAX;
- }
- memcpy (basename, tmp, sizeof ".");
+ {
+ long size = baselen_max = name_max;
+ if (name_max != size)
+ baselen_max = SIZE_MAX;
+ }
+ memcpy (base, tmp, sizeof ".");
}
if (HAVE_DOS_FILE_NAMES && baselen_max <= 12)
{
/* Live within DOS's 8.3 limit. */
- char *dot = strchr (basename, '.');
+ char *dot = strchr (base, '.');
if (!dot)
- baselen_max = 8;
+ baselen_max = 8;
else
- {
- char const *second_dot = strchr (dot + 1, '.');
- baselen_max = (second_dot
- ? second_dot - basename
- : dot + 1 - basename + 3);
- }
+ {
+ char const *second_dot = strchr (dot + 1, '.');
+ baselen_max = (second_dot
+ ? second_dot - base
+ : dot + 1 - base + 3);
+ }
}
if (baselen_max < baselen)
{
- baselen = filename + filelen - basename;
+ baselen = file + filelen - base;
if (baselen_max <= baselen)
- baselen = baselen_max - 1;
- basename[baselen] = e;
- basename[baselen + 1] = '\0';
+ baselen = baselen_max - 1;
+ base[baselen] = e;
+ base[baselen + 1] = '\0';
}
}
-#if HAVE_DIR
-
/* Returned values for NUMBERED_BACKUP. */
enum numbered_backup_result
struct dirent *dp;
char *buf = *buffer;
size_t versionlenmax = 1;
- char *basename = base_name (buf);
- size_t basename_offset = basename - buf;
- size_t baselen = base_len (basename);
+ char *base = last_component (buf);
+ size_t base_offset = base - buf;
+ size_t baselen = base_len (base);
/* Temporarily modify the buffer into its parent directory name,
open the directory, and then restore the buffer. */
char tmp[sizeof "."];
- memcpy (tmp, basename, sizeof ".");
- strcpy (basename, ".");
+ memcpy (tmp, base, sizeof ".");
+ strcpy (base, ".");
dirp = opendir (buf);
- memcpy (basename, tmp, sizeof ".");
- strcpy (basename + baselen, ".~1~");
+ memcpy (base, tmp, sizeof ".");
+ strcpy (base + baselen, ".~1~");
if (!dirp)
return result;
size_t versionlen;
size_t new_buflen;
- if (! REAL_DIR_ENTRY (dp) || NLENGTH (dp) < baselen + 4)
- continue;
+ if (! REAL_DIR_ENTRY (dp) || _D_EXACT_NAMLEN (dp) < baselen + 4)
+ continue;
- if (memcmp (buf + basename_offset, dp->d_name, baselen + 2) != 0)
- continue;
+ if (memcmp (buf + base_offset, dp->d_name, baselen + 2) != 0)
+ continue;
p = dp->d_name + baselen + 2;
/* Check whether this file has a version number and if so,
- whether it is larger. Use string operations rather than
- integer arithmetic, to avoid problems with integer overflow. */
+ whether it is larger. Use string operations rather than
+ integer arithmetic, to avoid problems with integer overflow. */
if (! ('1' <= *p && *p <= '9'))
- continue;
+ continue;
all_9s = (*p == '9');
for (versionlen = 1; ISDIGIT (p[versionlen]); versionlen++)
- all_9s &= (p[versionlen] == '9');
+ all_9s &= (p[versionlen] == '9');
if (! (p[versionlen] == '~' && !p[versionlen + 1]
- && (versionlenmax < versionlen
- || (versionlenmax == versionlen
- && memcmp (buf + filelen + 2, p, versionlen) <= 0))))
- continue;
+ && (versionlenmax < versionlen
+ || (versionlenmax == versionlen
+ && memcmp (buf + filelen + 2, p, versionlen) <= 0))))
+ continue;
/* This directory has the largest version number seen so far.
- Append this highest numbered extension to the file name,
- prepending '0' to the number if it is all 9s. */
+ Append this highest numbered extension to the file name,
+ prepending '0' to the number if it is all 9s. */
versionlenmax = all_9s + versionlen;
result = (all_9s ? BACKUP_IS_LONGER : BACKUP_IS_SAME_LENGTH);
new_buflen = filelen + 2 + versionlenmax + 1;
if (buffer_size <= new_buflen)
- {
- buf = xnrealloc (buf, 2, new_buflen);
- buffer_size = new_buflen * 2;
- }
+ {
+ buf = xnrealloc (buf, 2, new_buflen);
+ buffer_size = new_buflen * 2;
+ }
q = buf + filelen;
*q++ = '.';
*q++ = '~';
*q = '0';
q += all_9s;
memcpy (q, p, versionlen + 2);
-
+
/* Add 1 to the version number. */
q += versionlen;
while (*--q == '9')
- *q = '0';
+ *q = '0';
++*q;
}
*buffer = buf;
return result;
}
-#endif /* HAVE_DIR */
/* Return the name of the new backup file for the existing file FILE,
allocated with malloc. Report an error and fail if out of memory.
- Do not call this function if backup_type == none. */
+ Do not call this function if backup_type == no_backups. */
char *
find_backup_file_name (char const *file, enum backup_type backup_type)
size_t simple_backup_suffix_size = strlen (simple_backup_suffix) + 1;
size_t backup_suffix_size_guess = simple_backup_suffix_size;
enum { GUESS = sizeof ".~12345~" };
- if (HAVE_DIR && backup_suffix_size_guess < GUESS)
+ if (backup_suffix_size_guess < GUESS)
backup_suffix_size_guess = GUESS;
ssize = filelen + backup_suffix_size_guess + 1;
s = xmalloc (ssize);
memcpy (s, file, filelen + 1);
-#if HAVE_DIR
- if (backup_type != simple)
+ if (backup_type != simple_backups)
switch (numbered_backup (&s, ssize, filelen))
{
case BACKUP_IS_SAME_LENGTH:
- return s;
+ return s;
case BACKUP_IS_LONGER:
- simple = false;
- break;
+ simple = false;
+ break;
case BACKUP_IS_NEW:
- simple = (backup_type == numbered_existing);
- break;
+ simple = (backup_type == numbered_existing_backups);
+ break;
}
-#endif
if (simple)
memcpy (s + filelen, simple_backup_suffix, simple_backup_suffix_size);
static char const * const backup_args[] =
{
- /* In a series of synonyms, present the most meaning full first, so
+ /* 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",
- 0
+ NULL
};
static const enum backup_type backup_types[] =
{
- none, none,
- simple, simple,
- numbered_existing, numbered_existing,
- numbered, numbered
+ 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.
+ 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. */
get_version (char const *context, char const *version)
{
if (version == 0 || *version == 0)
- return numbered_existing;
+ return numbered_existing_backups;
else
return XARGMATCH (context, version, backup_args, backup_types);
}
projects / gnulib.git / blobdiff