/* 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, 2005 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,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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
static void
check_extension (char *file, size_t filelen, char e)
{
- char *base = base_name (file);
+ char *base = last_component (file);
size_t baselen = base_len (base);
size_t baselen_max = HAVE_LONG_FILE_NAMES ? 255 : NAME_MAX_MINIMUM;
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, base, sizeof ".");
strcpy (base, ".");
errno = 0;
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;
- }
+ {
+ long size = baselen_max = name_max;
+ if (name_max != size)
+ baselen_max = SIZE_MAX;
+ }
memcpy (base, tmp, sizeof ".");
}
/* Live within DOS's 8.3 limit. */
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 - base
- : dot + 1 - base + 3);
- }
+ {
+ char const *second_dot = strchr (dot + 1, '.');
+ baselen_max = (second_dot
+ ? second_dot - base
+ : dot + 1 - base + 3);
+ }
}
if (baselen_max < baselen)
{
baselen = file + filelen - base;
if (baselen_max <= baselen)
- baselen = baselen_max - 1;
+ 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 *base = base_name (buf);
+ char *base = last_component (buf);
size_t base_offset = base - buf;
size_t baselen = base_len (base);
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 + base_offset, dp->d_name, baselen + 2) != 0)
- continue;
+ 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 += 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.
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_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_backups);
- 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",
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
projects / gnulib.git / blobdiff