diff options
Diffstat (limited to 'rename.c')
| -rw-r--r-- | rename.c | 87 |
1 files changed, 74 insertions, 13 deletions
@@ -1,5 +1,5 @@ -/* rename.c -- BSD compatible directory function for System V - Copyright (C) 1988, 1990, 1992 Free Software Foundation, Inc. +/* BSD compatible rename and directory rename function for System V. + Copyright (C) 1988, 1990 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 @@ -12,16 +12,28 @@ 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, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + along with this program; if not, write to the Free Software Foundation, + Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#if HAVE_CONFIG_H +# include <config.h> +#endif #include <sys/types.h> #include <sys/stat.h> #include <errno.h> -#ifndef STDC_HEADERS +#ifndef errno extern int errno; #endif +#if STAT_MACROS_BROKEN +# undef S_ISDIR +#endif + +#if !defined(S_ISDIR) && defined(S_IFDIR) +# define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR) +#endif + /* Rename file FROM to file TO. Return 0 if successful, -1 if not. */ @@ -30,22 +42,71 @@ rename (from, to) char *from; char *to; { - struct stat from_stats; + struct stat from_stats, to_stats; + int pid, status; if (stat (from, &from_stats)) return -1; - if (unlink (to) && errno != ENOENT) - return -1; + /* Be careful not to unlink `from' if it happens to be equal to `to' or + (on filesystems that silently truncate filenames after 14 characters) + if `from' and `to' share the significant characters. */ + if (stat (to, &to_stats)) + { + if (errno != ENOENT) + return -1; + } + else + { + if ((from_stats.st_dev == to_stats.st_dev) + && (from_stats.st_ino == to_stats.st_ino)) + /* `from' and `to' designate the same file on that filesystem. */ + return 0; - if (link (from, to)) - return -1; + if (unlink (to) && errno != ENOENT) + return -1; + } + +#ifdef MVDIR - if (unlink (from) && errno != ENOENT) +/* If MVDIR is defined, it should be the full filename of a setuid root + program able to link and unlink directories. If MVDIR is not defined, + then the capability of renaming directories may be missing. */ + + if (S_ISDIR (from_stats.st_mode)) { - unlink (to); - return -1; + /* Need a setuid root process to link and unlink directories. */ + pid = fork (); + switch (pid) + { + case -1: /* Error. */ + error (1, errno, "cannot fork"); + + case 0: /* Child. */ + execl (MVDIR, "mvdir", from, to, (char *) 0); + error (255, errno, "cannot run `%s'", MVDIR); + + default: /* Parent. */ + while (wait (&status) != pid) + /* Do nothing. */ ; + + errno = 0; /* mvdir printed the system error message. */ + if (status) + return -1; + } } + else + +#endif /* MVDIR */ + { + if (link (from, to)) + return -1; + if (unlink (from) && errno != ENOENT) + { + unlink (to); + return -1; + } + } return 0; } |