diff options
Diffstat (limited to 'binutils/rename.c')
| -rw-r--r-- | binutils/rename.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/binutils/rename.c b/binutils/rename.c new file mode 100644 index 0000000..fdc7263 --- /dev/null +++ b/binutils/rename.c @@ -0,0 +1,210 @@ +/* rename.c -- rename a file, preserving symlinks. + Copyright (C) 1999 Free Software Foundation, Inc. + + This file is part of GNU Binutils. + + 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 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 + 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; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA + 02111-1307, USA. */ + +#include "bfd.h" +#include "bucomm.h" + +#include <sys/stat.h> + +#ifdef HAVE_GOOD_UTIME_H +#include <utime.h> +#else /* ! HAVE_GOOD_UTIME_H */ +#ifdef HAVE_UTIMES +#include <sys/time.h> +#endif /* HAVE_UTIMES */ +#endif /* ! HAVE_GOOD_UTIME_H */ + +static int simple_copy PARAMS ((const char *, const char *)); + +/* The number of bytes to copy at once. */ +#define COPY_BUF 8192 + +/* Copy file FROM to file TO, performing no translations. + Return 0 if ok, -1 if error. */ + +static int +simple_copy (from, to) + const char *from; + const char *to; +{ + int fromfd, tofd, nread; + int saved; + char buf[COPY_BUF]; + + fromfd = open (from, O_RDONLY); + if (fromfd < 0) + return -1; + tofd = creat (to, 0777); + if (tofd < 0) + { + saved = errno; + close (fromfd); + errno = saved; + return -1; + } + while ((nread = read (fromfd, buf, sizeof buf)) > 0) + { + if (write (tofd, buf, nread) != nread) + { + saved = errno; + close (fromfd); + close (tofd); + errno = saved; + return -1; + } + } + saved = errno; + close (fromfd); + close (tofd); + if (nread < 0) + { + errno = saved; + return -1; + } + return 0; +} + +/* Set the times of the file DESTINATION to be the same as those in + STATBUF. */ + +void +set_times (destination, statbuf) + const char *destination; + const struct stat *statbuf; +{ + int result; + + { +#ifdef HAVE_GOOD_UTIME_H + struct utimbuf tb; + + tb.actime = statbuf->st_atime; + tb.modtime = statbuf->st_mtime; + result = utime (destination, &tb); +#else /* ! HAVE_GOOD_UTIME_H */ +#ifndef HAVE_UTIMES + long tb[2]; + + tb[0] = statbuf->st_atime; + tb[1] = statbuf->st_mtime; + result = utime (destination, tb); +#else /* HAVE_UTIMES */ + struct timeval tv[2]; + + tv[0].tv_sec = statbuf->st_atime; + tv[0].tv_usec = 0; + tv[1].tv_sec = statbuf->st_mtime; + tv[1].tv_usec = 0; + result = utimes (destination, tv); +#endif /* HAVE_UTIMES */ +#endif /* ! HAVE_GOOD_UTIME_H */ + } + + if (result != 0) + non_fatal (_("%s: cannot set time: %s"), destination, strerror (errno)); +} + +#ifndef S_ISLNK +#ifdef S_IFLNK +#define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK) +#else +#define S_ISLNK(m) 0 +#define lstat stat +#endif +#endif + +/* Rename FROM to TO, copying if TO is a link. + Return 0 if ok, -1 if error. */ + +int +smart_rename (from, to, preserve_dates) + const char *from; + const char *to; + int preserve_dates; +{ + int exists; + struct stat s; + int ret = 0; + + exists = lstat (to, &s); + +#if defined (_WIN32) && !defined (__CYGWIN32__) + /* Win32, unlike unix, will not erase `to' in `rename(from, to)' but + fail instead. Also, chown is not present. */ + + if (exists == 0) + remove (to); + + ret = rename (from, to); + if (ret != 0) + { + /* We have to clean up here. */ + + non_fatal (_("%s: rename: %s"), to, strerror (errno)); + unlink (from); + } +#else + /* Use rename only if TO is not a symbolic link and has + only one hard link. */ + if (exists < 0 || (!S_ISLNK (s.st_mode) && s.st_nlink == 1)) + { + ret = rename (from, to); + if (ret == 0) + { + if (exists) + { + /* Try to preserve the permission bits and ownership of + TO. First get the mode right except for the setuid + bit. Then change the ownership. Then fix the setuid + bit. We do the chmod before the chown because if the + chown succeeds, and we are a normal user, we won't be + able to do the chmod afterward. We don't bother to + fix the setuid bit first because that might introduce + a fleeting security problem, and because the chown + will clear the setuid bit anyhow. We only fix the + setuid bit if the chown succeeds, because we don't + want to introduce an unexpected setuid file owned by + the user running objcopy. */ + chmod (to, s.st_mode & 0777); + if (chown (to, s.st_uid, s.st_gid) >= 0) + chmod (to, s.st_mode & 07777); + } + } + else + { + /* We have to clean up here. */ + non_fatal (_("%s: rename: %s"), to, strerror (errno)); + unlink (from); + } + } + else + { + ret = simple_copy (from, to); + if (ret != 0) + non_fatal (_("%s: simple_copy: %s"), to, strerror (errno)); + + if (preserve_dates) + set_times (to, &s); + unlink (from); + } +#endif /* _WIN32 && !__CYGWIN32__ */ + + return ret; +} |