cp_mv.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini `cp' and `mv' implementation for BusyBox.
   4  *
   5  *
   6  * Copyright (C) 1999,2000,2001 by Lineo, inc.
   7  * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
   8  *
   9  * Copyright (C) 2000 by BitterSweet Enterprises, LLC. (GPL)
  10  * Extensively modified and rewritten by  Karl M. Hegbloom <karlheg@debian.org>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  20  * General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  25  *
  26  */
  27
  28 #include "busybox.h"
  29 #define BB_DECLARE_EXTERN
  30 #define bb_need_name_too_long
  31 #define bb_need_omitting_directory
  32 #define bb_need_not_a_directory
  33 #include "messages.c"
  34
  35 #include <stdio.h>
  36 #include <time.h>
  37 #include <utime.h>
  38 #include <dirent.h>
  39 #include <sys/param.h>
  40 #include <setjmp.h>
  41 #include <string.h>
  42 #include <unistd.h>
  43 #include <errno.h>
  44 #include <getopt.h>
  45 #include <stdlib.h>
  46
  47 static const int is_cp = 0;
  48 static const int is_mv = 1;
  49 static int         dz_i;                /* index into cp_mv_usage */
  50
  51 static const char *cp_mv_usage[] =      /* .rodata */
  52 {
  53         cp_usage,
  54         mv_usage
  55 };
  56
  57 static int recursiveFlag;
  58 static int followLinks;
  59 static int preserveFlag;
  60 static int forceFlag;
  61
  62 static const char *baseSrcName;
  63 static int                 srcDirFlag;
  64 static struct stat srcStatBuf;
  65
  66 static char                *pBaseDestName;
  67 static size_t      baseDestLen;
  68 static int                 destDirFlag;
  69 static struct stat destStatBuf;
  70
  71 static jmp_buf      catch;
  72 static volatile int mv_Action_first_time;
  73
  74 static void name_too_long__exit (void) __attribute__((noreturn));
  75
  76 static
  77 void name_too_long__exit (void)
  78 {
  79         error_msg_and_die(name_too_long);
  80 }
  81
  82 static void
  83 fill_baseDest_buf(char *_buf, size_t * _buflen) {
  84         const char *srcBasename;
  85         if ((srcBasename = strrchr(baseSrcName, '/')) == NULL) {
  86                 srcBasename = baseSrcName;
  87                 if (_buf[*_buflen - 1] != '/') {
  88                         if (++(*_buflen) > BUFSIZ)
  89                                 name_too_long__exit();
  90                         strcat(_buf, "/");
  91                 }
  92         }
  93         if (*_buflen + strlen(srcBasename) > BUFSIZ)
  94                 name_too_long__exit();
  95         strcat(_buf, srcBasename);
  96         return;
  97
  98 }
  99
 100 static int
 101 cp_mv_Action(const char *fileName, struct stat *statbuf, void* junk)
 102 {
 103         char            destName[BUFSIZ + 1];
 104         size_t          destLen;
 105         const char *srcBasename;
 106         char       *name;
 107
 108         strcpy(destName, pBaseDestName);
 109         destLen = strlen(destName);
 110
 111         if (srcDirFlag == TRUE) {
 112                 if (recursiveFlag == FALSE) {
 113                         error_msg(omitting_directory, baseSrcName);
 114                         return TRUE;
 115                 }
 116                 srcBasename = (strstr(fileName, baseSrcName)
 117                                            + strlen(baseSrcName));
 118
 119                 if (destLen + strlen(srcBasename) > BUFSIZ) {
 120                         error_msg(name_too_long);
 121                         return FALSE;
 122                 }
 123                 strcat(destName, srcBasename);
 124         }
 125         else if (destDirFlag == TRUE) {
 126                 fill_baseDest_buf(&destName[0], &destLen);
 127         }
 128         else {
 129                 srcBasename = baseSrcName;
 130         }
 131         if (mv_Action_first_time && (dz_i == is_mv)) {
 132                 mv_Action_first_time = errno = 0;
 133                 if (rename(fileName, destName) < 0 && errno != EXDEV) {
 134                         perror_msg("rename(%s, %s)", fileName, destName);
 135                         goto do_copyFile;       /* Try anyway... */
 136                 }
 137                 else if (errno == EXDEV)
 138                         goto do_copyFile;
 139                 else
 140                         longjmp(catch, 1);      /* succeeded with rename() */
 141         }
 142  do_copyFile:
 143         if (preserveFlag == TRUE && statbuf->st_nlink > 1) {
 144                 if (is_in_ino_dev_hashtable(statbuf, &name)) {
 145                         if (link(name, destName) < 0) {
 146                                 perror_msg("link(%s, %s)", name, destName);
 147                                 return FALSE;
 148                         }
 149                         return TRUE;
 150                 }
 151                 else {
 152                         add_to_ino_dev_hashtable(statbuf, destName);
 153                 }
 154         }
 155         return copy_file(fileName, destName, preserveFlag, followLinks, forceFlag);
 156 }
 157
 158 static int
 159 rm_Action(const char *fileName, struct stat *statbuf, void* junk)
 160 {
 161         int status = TRUE;
 162
 163         if (S_ISDIR(statbuf->st_mode)) {
 164                 if (rmdir(fileName) < 0) {
 165                         perror_msg("rmdir(%s)", fileName);
 166                         status = FALSE;
 167                 }
 168         } else if (unlink(fileName) < 0) {
 169                 perror_msg("unlink(%s)", fileName);
 170                 status = FALSE;
 171         }
 172         return status;
 173 }
 174
 175 extern int cp_mv_main(int argc, char **argv)
 176 {
 177         volatile int i;
 178         int c;
 179         RESERVE_BB_BUFFER(baseDestName,BUFSIZ + 1);
 180         pBaseDestName = baseDestName; /* available globally */
 181
 182         if (*applet_name == 'c' && *(applet_name + 1) == 'p')
 183                 dz_i = is_cp;
 184         else
 185                 dz_i = is_mv;
 186         if (argc < 3)
 187                 usage(cp_mv_usage[dz_i]);
 188
 189         if (dz_i == is_cp) {
 190                 recursiveFlag = preserveFlag = forceFlag = FALSE;
 191                 followLinks = TRUE;
 192                 while ((c = getopt(argc, argv, "adpRf")) != EOF) {
 193                                 switch (c) {
 194                                 case 'a':
 195                                         followLinks = FALSE;
 196                                         preserveFlag = TRUE;
 197                                         recursiveFlag = TRUE;
 198                                         break;
 199                                 case 'd':
 200                                         followLinks = FALSE;
 201                                         break;
 202                                 case 'p':
 203                                         preserveFlag = TRUE;
 204                                         break;
 205                                 case 'R':
 206                                         recursiveFlag = TRUE;
 207                                         break;
 208                                 case 'f':
 209                                         forceFlag = TRUE;
 210                                         break;
 211                                 default:
 212                                         usage(cp_mv_usage[is_cp]);
 213                                 }
 214                 }
 215                 if ((argc - optind) < 2) {
 216                         usage(cp_mv_usage[dz_i]);
 217                 }
 218         } else {                                        /* (dz_i == is_mv) */
 219                 /* Initialize optind to 1, since in libc5 optind
 220                  * is not initialized until getopt() is called
 221                  * (or until sneaky programmers force it...). */
 222                 optind = 1;
 223                 recursiveFlag = preserveFlag = TRUE;
 224                 followLinks = FALSE;
 225         }
 226
 227
 228         if (strlen(argv[argc - 1]) > BUFSIZ) {
 229                 error_msg(name_too_long);
 230                 goto exit_false;
 231         }
 232         strcpy(baseDestName, argv[argc - 1]);
 233         baseDestLen = strlen(baseDestName);
 234         if (baseDestLen == 0)
 235                 goto exit_false;
 236
 237         destDirFlag = is_directory(baseDestName, TRUE, &destStatBuf);
 238         if (argc - optind > 2 && destDirFlag == FALSE) {
 239                 error_msg(not_a_directory, baseDestName);
 240                 goto exit_false;
 241         }
 242
 243         for (i = optind; i < (argc-1); i++) {
 244                 size_t srcLen;
 245                 volatile int flags_memo;
 246                 int        status;
 247
 248                 baseSrcName=argv[i];
 249
 250                 if ((srcLen = strlen(baseSrcName)) > BUFSIZ)
 251                         name_too_long__exit();
 252
 253                 if (srcLen == 0) continue; /* "" */
 254
 255                 srcDirFlag = is_directory(baseSrcName, followLinks, &srcStatBuf);
 256
 257                 if ((flags_memo = (recursiveFlag == TRUE &&
 258                                                    srcDirFlag == TRUE && destDirFlag == TRUE))) {
 259
 260                         struct stat sb;
 261                         int                     state = 0;
 262                         char            *pushd, *d, *p;
 263
 264                         if ((pushd = getcwd(NULL, BUFSIZ + 1)) == NULL) {
 265                                 perror_msg("getcwd()");
 266                                 continue;
 267                         }
 268                         if (chdir(baseDestName) < 0) {
 269                                 perror_msg("chdir(%s)", baseSrcName);
 270                                 continue;
 271                         }
 272                         if ((d = getcwd(NULL, BUFSIZ + 1)) == NULL) {
 273                                 perror_msg("getcwd()");
 274                                 continue;
 275                         }
 276                         while (!state && *d != '\0') {
 277                                 if (stat(d, &sb) < 0) { /* stat not lstat - always dereference targets */
 278                                         perror_msg("stat(%s)", d);
 279                                         state = -1;
 280                                         continue;
 281                                 }
 282                                 if ((sb.st_ino == srcStatBuf.st_ino) &&
 283                                         (sb.st_dev == srcStatBuf.st_dev)) {
 284                                         error_msg("Cannot %s `%s' into a subdirectory of itself, "
 285                                                         "`%s/%s'\n", applet_name, baseSrcName,
 286                                                         baseDestName, baseSrcName);
 287                                         state = -1;
 288                                         continue;
 289                                 }
 290                                 if ((p = strrchr(d, '/')) != NULL) {
 291                                         *p = '\0';
 292                                 }
 293                         }
 294                         if (chdir(pushd) < 0) {
 295                                 perror_msg("chdir(%s)", pushd);
 296                                 free(pushd);
 297                                 free(d);
 298                                 continue;
 299                         }
 300                         free(pushd);
 301                         free(d);
 302                         if (state < 0)
 303                                 continue;
 304                         else
 305                                 fill_baseDest_buf(baseDestName, &baseDestLen);
 306                 }
 307                 status = setjmp(catch);
 308                 if (status == 0) {
 309                         mv_Action_first_time = 1;
 310                         if (recursive_action(baseSrcName,
 311                                                                 recursiveFlag, followLinks, FALSE,
 312                                                                 cp_mv_Action, cp_mv_Action, NULL) == FALSE) goto exit_false;
 313                         if (dz_i == is_mv &&
 314                                 recursive_action(baseSrcName,
 315                                                                 recursiveFlag, followLinks, TRUE,
 316                                                                 rm_Action, rm_Action, NULL) == FALSE) goto exit_false;
 317                 }
 318                 if (flags_memo)
 319                         *(baseDestName + baseDestLen) = '\0';
 320         }
 321         return EXIT_SUCCESS;
 322  exit_false:
 323         return EXIT_FAILURE;
 324 }
 325
 326 /*
 327 Local Variables:
 328 c-file-style: "linux"
 329 c-basic-offset: 4
 330 tab-width: 4
 331 End:
 332 */