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Diffstat (limited to 'contrib/patch/backupfile.c')
| -rw-r--r-- | contrib/patch/backupfile.c | 252 |
1 files changed, 0 insertions, 252 deletions
diff --git a/contrib/patch/backupfile.c b/contrib/patch/backupfile.c deleted file mode 100644 index 4b0f2ec..0000000 --- a/contrib/patch/backupfile.c +++ /dev/null @@ -1,252 +0,0 @@ -/* 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) - -/* 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. - - It's typically faster. - Posix 1003.2-1992 section 2.5.2.1 page 50 lines 1556-1558 says that - only '0' through '9' are digits. Prefer ISDIGIT to 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) (c) - '0' <= 9) - -#if D_INO_IN_DIRENT -# define REAL_DIR_ENTRY(dp) ((dp)->d_ino != 0) -#else -# define REAL_DIR_ENTRY(dp) 1 -#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. */ -const char *simple_backup_suffix = ".orig"; - -static int max_backup_version __BACKUPFILE_P ((const char *, const char *)); -static int version_number __BACKUPFILE_P ((const char *, const char *, 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) - const char *file; -{ - size_t backup_suffix_size_max; - size_t file_len = strlen (file); - size_t numbered_suffix_size_max = INT_STRLEN_BOUND (int) + 4; - char *s; - const char *suffix = simple_backup_suffix; - - /* Allow room for simple or `.~N~' backups. */ - backup_suffix_size_max = strlen (simple_backup_suffix) + 1; - if (HAVE_DIR && backup_suffix_size_max < numbered_suffix_size_max) - backup_suffix_size_max = numbered_suffix_size_max; - - s = malloc (file_len + backup_suffix_size_max + numbered_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)) - { - char *numbered_suffix = s + (file_len + backup_suffix_size_max); - sprintf (numbered_suffix, ".~%d~", highest_backup + 1); - suffix = numbered_suffix; - } - strcpy (s, file); - } -#endif /* HAVE_DIR */ - - addext (s, 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) - const char *file; - const char *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)) - 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) - const char *base; - const char *backup; - size_t base_length; -{ - int version; - const char *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 const char * const backup_args[] = -{ - "never", "simple", "nil", "existing", "t", "numbered", 0 -}; - -static const enum backup_type 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) - const char *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]; -} |
