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33 * @(#)utils.c 8.3 (Berkeley) 4/1/94
34 * $FreeBSD: src/bin/cp/utils.c,v 1.45 2005/02/09 17:37:37 ru Exp $
35 * $DragonFly: src/bin/cp/utils.c,v 1.11 2007/06/15 07:02:51 corecode Exp $
38 #include <sys/param.h>
41 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
56 #define cp_pct(x,y) (int)(100.0 * (double)(x) / (double)(y))
58 #define YESNO "(y/n [n]) "
61 copy_file(const FTSENT *entp, int dne)
63 static char buf[MAXBSIZE];
65 int ch, checkch, from_fd, rval, to_fd;
66 size_t rcount, wcount, wresid;
69 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
73 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) {
74 warn("%s", entp->fts_path);
81 * If the file exists and we're interactive, verify with the user.
82 * If the file DNE, set the mode to be the from file, minus setuid
83 * bits, modified by the umask; arguably wrong, but it makes copying
84 * executables work right and it's been that way forever. (The
85 * other choice is 666 or'ed with the execute bits on the from file
86 * modified by the umask.)
91 printf("%s not overwritten\n", to.p_path);
95 fprintf(stderr, "overwrite %s? %s",
97 checkch = ch = getchar();
98 while (ch != '\n' && ch != EOF)
100 if (checkch != 'y' && checkch != 'Y') {
102 fprintf(stderr, "not overwritten\n");
108 /* remove existing destination file name,
109 * create a new file */
111 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT,
112 fs->st_mode & ~(S_ISUID | S_ISGID));
114 /* overwrite existing destination file name */
115 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0);
117 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT,
118 fs->st_mode & ~(S_ISUID | S_ISGID));
121 warn("%s", to.p_path);
129 * Mmap and write if less than 8M (the limit is so we don't totally
130 * trash memory on big files. This is really a minor hack, but it
131 * wins some CPU back.
133 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
134 if (S_ISREG(fs->st_mode) && fs->st_size > 0 &&
135 fs->st_size <= 8 * 1048576) {
136 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ,
137 MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) {
138 warn("%s", entp->fts_path);
142 for (bufp = p, wresid = fs->st_size; ;
143 bufp += wcount, wresid -= wcount) {
144 wcount = write(to_fd, bufp, wresid);
145 if ((ssize_t)wcount == -1)
152 entp->fts_path, to.p_path,
153 cp_pct(wtotal, fs->st_size));
155 if (wcount >= wresid || wcount == 0)
158 if (wcount != wresid) {
159 warn("%s", to.p_path);
162 /* Some systems don't unmap on close(2). */
163 if (munmap(p, fs->st_size) < 0) {
164 warn("%s", entp->fts_path);
172 while ((ssize_t)(rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
173 for (bufp = buf, wresid = rcount; ;
174 bufp += wcount, wresid -= wcount) {
175 wcount = write(to_fd, bufp, wresid);
176 if ((ssize_t)wcount == -1)
183 entp->fts_path, to.p_path,
184 cp_pct(wtotal, fs->st_size));
186 if (wcount >= wresid || wcount == 0)
189 if (wcount != wresid) {
190 warn("%s", to.p_path);
195 if ((ssize_t)rcount == -1) {
196 warn("%s", entp->fts_path);
202 * Don't remove the target even after an error. The target might
203 * not be a regular file, or its attributes might be important,
204 * or its contents might be irreplaceable. It would only be safe
205 * to remove it if we created it and its length is 0.
208 if (pflag && setfile(fs, to_fd))
212 warn("%s", to.p_path);
219 copy_link(const FTSENT *p, int exists)
222 char linkname[PATH_MAX];
224 if ((len = readlink(p->fts_path, linkname, sizeof(linkname) - 1)) == -1) {
225 warn("readlink: %s", p->fts_path);
228 linkname[len] = '\0';
229 if (exists && unlink(to.p_path)) {
230 warn("unlink: %s", to.p_path);
233 if (symlink(linkname, to.p_path)) {
234 warn("symlink: %s", linkname);
237 return (pflag ? setfile(p->fts_statp, -1) : 0);
241 copy_fifo(struct stat *from_stat, int exists)
243 if (exists && unlink(to.p_path)) {
244 warn("unlink: %s", to.p_path);
247 if (mkfifo(to.p_path, from_stat->st_mode)) {
248 warn("mkfifo: %s", to.p_path);
251 return (pflag ? setfile(from_stat, -1) : 0);
255 copy_special(struct stat *from_stat, int exists)
257 if (exists && unlink(to.p_path)) {
258 warn("unlink: %s", to.p_path);
261 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) {
262 warn("mknod: %s", to.p_path);
265 return (pflag ? setfile(from_stat, -1) : 0);
269 setfile(struct stat *fs, int fd)
271 static struct timeval tv[2];
273 int rval, gotstat, islink, fdval;
277 islink = !fdval && S_ISLNK(fs->st_mode);
278 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX |
279 S_IRWXU | S_IRWXG | S_IRWXO;
281 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec);
282 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec);
283 if (islink ? lutimes(to.p_path, tv) : utimes(to.p_path, tv)) {
284 warn("%sutimes: %s", islink ? "l" : "", to.p_path);
287 if (fdval ? fstat(fd, &ts) :
288 (islink ? lstat(to.p_path, &ts) : stat(to.p_path, &ts))) {
292 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX |
293 S_IRWXU | S_IRWXG | S_IRWXO;
296 * Changing the ownership probably won't succeed, unless we're root
297 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting
298 * the mode; current BSD behavior is to remove all setuid bits on
299 * chown. If chown fails, lose setuid/setgid bits.
301 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid)
302 if (fdval ? fchown(fd, fs->st_uid, fs->st_gid) :
303 (islink ? lchown(to.p_path, fs->st_uid, fs->st_gid) :
304 chown(to.p_path, fs->st_uid, fs->st_gid))) {
305 if (errno != EPERM) {
306 warn("chown: %s", to.p_path);
309 fs->st_mode &= ~(S_ISUID | S_ISGID);
312 if (!gotstat || fs->st_mode != ts.st_mode)
313 if (fdval ? fchmod(fd, fs->st_mode) :
314 (islink ? lchmod(to.p_path, fs->st_mode) :
315 chmod(to.p_path, fs->st_mode))) {
316 warn("chmod: %s", to.p_path);
320 if (!gotstat || fs->st_flags != ts.st_flags)
322 fchflags(fd, fs->st_flags) :
323 (islink ? (errno = ENOSYS) :
324 chflags(to.p_path, fs->st_flags))) {
325 warn("chflags: %s", to.p_path);
335 fprintf(stderr, "%s\n%s\n",
336 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] source_file target_file",
337 " cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] source_file ... "