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v2.2
backupfile.c
239 строк
6 KB
Andreas Gruenbacher
Import of patch-2.2.tar.gz
12 мар 2009, 17:13
12 мар 2009, 17:13
bcce123
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/* backupfile.c -- make Emacs style backup file names Copyright (C) 1990,1991,1992,1993,1995,1997 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 2, 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; see the file COPYING. If not, write to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* Written by David MacKenzie <djm@gnu.ai.mit.edu>. Some algorithms adapted from GNU Emacs. */ #if HAVE_CONFIG_H # include <config.h> #endif #include <argmatch.h> #include <backupfile.h> #include <stdio.h> #include <sys/types.h> #if HAVE_STRING_H # include <string.h> #else # include <strings.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 #if CLOSEDIR_VOID /* Fake a return value. */ # define CLOSEDIR(d) (closedir (d), 0) #else # define CLOSEDIR(d) closedir (d) #endif #if STDC_HEADERS # include <stdlib.h> #else char *malloc (); #endif #if HAVE_DIRENT_H || HAVE_NDIR_H || HAVE_SYS_DIR_H || HAVE_SYS_NDIR_H # define HAVE_DIR 1 #else # define HAVE_DIR 0 #endif #if HAVE_LIMITS_H # include <limits.h> #endif #ifndef CHAR_BIT #define CHAR_BIT 8 #endif /* Upper bound on the string length of an integer converted to string. 302 / 1000 is ceil (log10 (2.0)). Subtract 1 for the sign bit; add 1 for integer division truncation; add 1 more for a minus sign. */ #define INT_STRLEN_BOUND(t) ((sizeof (t) * CHAR_BIT - 1) * 302 / 1000 + 2) #define ISDIGIT(c) (((unsigned) (c) - '0') <= 9) #ifdef _POSIX_VERSION /* POSIX does not require that the d_ino field be present, and some systems do not provide it. */ # define REAL_DIR_ENTRY(dp) 1 #else # define REAL_DIR_ENTRY(dp) ((dp)->d_ino != 0) #endif /* Which type of backup file names are generated. */ enum backup_type backup_type = none; /* The extension added to file names to produce a simple (as opposed to numbered) backup file name. */ char const *simple_backup_suffix = ".orig"; static int max_backup_version __BACKUPFILE_P ((char const *, char const *)); static int version_number __BACKUPFILE_P ((char const *, char const *, size_t)); /* Return the name of the new backup file for file FILE, allocated with malloc. Return 0 if out of memory. FILE must not end with a '/' unless it is the root directory. Do not call this function if backup_type == none. */ char * find_backup_file_name (file) char const *file; { size_t backup_suffix_size_max; char *s; /* Allow room for simple or `.~N~' backups. */ backup_suffix_size_max = strlen (simple_backup_suffix) + 1; if (HAVE_DIR && backup_suffix_size_max < INT_STRLEN_BOUND (int) + 4) backup_suffix_size_max = INT_STRLEN_BOUND (int) + 4; s = malloc (strlen (file) + backup_suffix_size_max); if (s) { strcpy (s, file); #if HAVE_DIR if (backup_type != simple) { int highest_backup; size_t dir_len = base_name (s) - s; strcpy (s + dir_len, "."); highest_backup = max_backup_version (file + dir_len, s); if (! (backup_type == numbered_existing && highest_backup == 0)) { sprintf (s, "%s.~%d~", file, highest_backup + 1); return s; } strcpy (s, file); } #endif /* HAVE_DIR */ addext (s, simple_backup_suffix, '~'); } return s; } #if HAVE_DIR /* Return the number of the highest-numbered backup file for file FILE in directory DIR. If there are no numbered backups of FILE in DIR, or an error occurs reading DIR, return 0. */ static int max_backup_version (file, dir) char const *file, *dir; { DIR *dirp; struct dirent *dp; int highest_version; int this_version; size_t file_name_length; dirp = opendir (dir); if (!dirp) return 0; highest_version = 0; file_name_length = strlen (file); while ((dp = readdir (dirp)) != 0) { if (!REAL_DIR_ENTRY (dp) || NLENGTH (dp) < file_name_length + 4) continue; this_version = version_number (file, dp->d_name, file_name_length); if (this_version > highest_version) highest_version = this_version; } if (CLOSEDIR (dirp) != 0) return 0; return highest_version; } /* If BACKUP is a numbered backup of BASE, return its version number; otherwise return 0. BASE_LENGTH is the length of BASE. */ static int version_number (base, backup, base_length) char const *base; char const *backup; size_t base_length; { int version; char const *p; version = 0; if (strncmp (base, backup, base_length) == 0 && backup[base_length] == '.' && backup[base_length + 1] == '~') { for (p = &backup[base_length + 2]; ISDIGIT (*p); ++p) version = version * 10 + *p - '0'; if (p[0] != '~' || p[1]) version = 0; } return version; } #endif /* HAVE_DIR */ static char const * const backup_args[] = { "never", "simple", "nil", "existing", "t", "numbered", 0 }; static enum backup_type const backup_types[] = { simple, simple, numbered_existing, numbered_existing, numbered, numbered }; /* Return the type of backup indicated by VERSION. Unique abbreviations are accepted. */ enum backup_type get_version (version) char const *version; { int i; if (version == 0 || *version == 0) return numbered_existing; i = argmatch (version, backup_args); if (i < 0) { invalid_arg ("version control type", version, i); exit (2); } return backup_types[i]; }