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 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
  46 static const int is_cp = 0;
  47 static const int is_mv = 1;
  48 static int         dz_i;                /* index into cp_mv_usage */
  49
  50 static const char *cp_mv_usage[] =      /* .rodata */
  51 {
  52         cp_usage,
  53         mv_usage
  54 };
  55
  56 static int recursiveFlag;
  57 static int followLinks;
  58 static int preserveFlag;
  59 static int forceFlag;
  60
  61 static const char *baseSrcName;
  62 static int                 srcDirFlag;
  63 static struct stat srcStatBuf;
  64
  65 static char                *pBaseDestName;
  66 static size_t      baseDestLen;
  67 static int                 destDirFlag;
  68 static struct stat destStatBuf;
  69
  70 static jmp_buf      catch;
  71 static volatile int mv_Action_first_time;
  72
  73 static void name_too_long__exit (void) __attribute__((noreturn));
  74
  75 static
  76 void name_too_long__exit (void)
  77 {
  78         error_msg_and_die(name_too_long);
  79 }
  80
  81 static void
  82 fill_baseDest_buf(char *_buf, size_t * _buflen) {
  83         const char *srcBasename;
  84         if ((srcBasename = strrchr(baseSrcName, '/')) == NULL) {
  85                 srcBasename = baseSrcName;
  86                 if (_buf[*_buflen - 1] != '/') {
  87                         if (++(*_buflen) > BUFSIZ)
  88                                 name_too_long__exit();
  89                         strcat(_buf, "/");
  90                 }
  91         }
  92         if (*_buflen + strlen(srcBasename) > BUFSIZ)
  93                 name_too_long__exit();
  94         strcat(_buf, srcBasename);
  95         return;
  96
  97 }
  98
  99 static int
 100 cp_mv_Action(const char *fileName, struct stat *statbuf, void* junk)
 101 {
 102         char            destName[BUFSIZ + 1];
 103         size_t          destLen;
 104         const char *srcBasename;
 105         char       *name;
 106
 107         strcpy(destName, pBaseDestName);
 108         destLen = strlen(destName);
 109
 110         if (srcDirFlag == TRUE) {
 111                 if (recursiveFlag == FALSE) {
 112                         error_msg(omitting_directory, baseSrcName);
 113                         return TRUE;
 114                 }
 115                 srcBasename = (strstr(fileName, baseSrcName)
 116                                            + strlen(baseSrcName));
 117
 118                 if (destLen + strlen(srcBasename) > BUFSIZ) {
 119                         error_msg(name_too_long);
 120                         return FALSE;
 121                 }
 122                 strcat(destName, srcBasename);
 123         }
 124         else if (destDirFlag == TRUE) {
 125                 fill_baseDest_buf(&destName[0], &destLen);
 126         }
 127         else {
 128                 srcBasename = baseSrcName;
 129         }
 130         if (mv_Action_first_time && (dz_i == is_mv)) {
 131                 mv_Action_first_time = errno = 0;
 132                 if (rename(fileName, destName) < 0 && errno != EXDEV) {
 133                         perror_msg("rename(%s, %s)", fileName, destName);
 134                         goto do_copyFile;       /* Try anyway... */
 135                 }
 136                 else if (errno == EXDEV)
 137                         goto do_copyFile;
 138                 else
 139                         longjmp(catch, 1);      /* succeeded with rename() */
 140         }
 141  do_copyFile:
 142         if (preserveFlag == TRUE && statbuf->st_nlink > 1) {
 143                 if (is_in_ino_dev_hashtable(statbuf, &name)) {
 144                         if (link(name, destName) < 0) {
 145                                 perror_msg("link(%s, %s)", name, destName);
 146                                 return FALSE;
 147                         }
 148                         return TRUE;
 149                 }
 150                 else {
 151                         add_to_ino_dev_hashtable(statbuf, destName);
 152                 }
 153         }
 154         return copy_file(fileName, destName, preserveFlag, followLinks, forceFlag);
 155 }
 156
 157 static int
 158 rm_Action(const char *fileName, struct stat *statbuf, void* junk)
 159 {
 160         int status = TRUE;
 161
 162         if (S_ISDIR(statbuf->st_mode)) {
 163                 if (rmdir(fileName) < 0) {
 164                         perror_msg("rmdir(%s)", fileName);
 165                         status = FALSE;
 166                 }
 167         } else if (unlink(fileName) < 0) {
 168                 perror_msg("unlink(%s)", fileName);
 169                 status = FALSE;
 170         }
 171         return status;
 172 }
 173
 174 extern int cp_mv_main(int argc, char **argv)
 175 {
 176         volatile int i;
 177         int c;
 178         RESERVE_BB_BUFFER(baseDestName,BUFSIZ + 1);
 179         pBaseDestName = baseDestName; /* available globally */
 180
 181         if (*applet_name == 'c' && *(applet_name + 1) == 'p')
 182                 dz_i = is_cp;
 183         else
 184                 dz_i = is_mv;
 185         if (argc < 3)
 186                 usage(cp_mv_usage[dz_i]);
 187
 188         if (dz_i == is_cp) {
 189                 recursiveFlag = preserveFlag = forceFlag = FALSE;
 190                 followLinks = TRUE;
 191                 while ((c = getopt(argc, argv, "adpRf")) != EOF) {
 192                                 switch (c) {
 193                                 case 'a':
 194                                         followLinks = FALSE;
 195                                         preserveFlag = TRUE;
 196                                         recursiveFlag = TRUE;
 197                                         break;
 198                                 case 'd':
 199                                         followLinks = FALSE;
 200                                         break;
 201                                 case 'p':
 202                                         preserveFlag = TRUE;
 203                                         break;
 204                                 case 'R':
 205                                         recursiveFlag = TRUE;
 206                                         break;
 207                                 case 'f':
 208                                         forceFlag = TRUE;
 209                                         break;
 210                                 default:
 211                                         usage(cp_mv_usage[is_cp]);
 212                                 }
 213                 }
 214                 if ((argc - optind) < 2) {
 215                         usage(cp_mv_usage[dz_i]);
 216                 }
 217         } else {                                        /* (dz_i == is_mv) */
 218                 /* Initialize optind to 1, since in libc5 optind
 219                  * is not initialized until getopt() is called
 220                  * (or until sneaky programmers force it...). */
 221                 optind = 1;
 222                 recursiveFlag = preserveFlag = TRUE;
 223                 followLinks = FALSE;
 224         }
 225
 226
 227         if (strlen(argv[argc - 1]) > BUFSIZ) {
 228                 error_msg(name_too_long);
 229                 goto exit_false;
 230         }
 231         strcpy(baseDestName, argv[argc - 1]);
 232         baseDestLen = strlen(baseDestName);
 233         if (baseDestLen == 0)
 234                 goto exit_false;
 235
 236         destDirFlag = is_directory(baseDestName, TRUE, &destStatBuf);
 237         if (argc - optind > 2 && destDirFlag == FALSE) {
 238                 error_msg(not_a_directory, baseDestName);
 239                 goto exit_false;
 240         }
 241
 242         for (i = optind; i < (argc-1); i++) {
 243                 size_t srcLen;
 244                 volatile int flags_memo;
 245                 int        status;
 246
 247                 baseSrcName=argv[i];
 248
 249                 if ((srcLen = strlen(baseSrcName)) > BUFSIZ)
 250                         name_too_long__exit();
 251
 252                 if (srcLen == 0) continue; /* "" */
 253
 254                 srcDirFlag = is_directory(baseSrcName, followLinks, &srcStatBuf);
 255
 256                 if ((flags_memo = (recursiveFlag == TRUE &&
 257                                                    srcDirFlag == TRUE && destDirFlag == TRUE))) {
 258
 259                         struct stat sb;
 260                         int                     state = 0;
 261                         char            *pushd, *d, *p;
 262
 263                         if ((pushd = getcwd(NULL, BUFSIZ + 1)) == NULL) {
 264                                 perror_msg("getcwd()");
 265                                 continue;
 266                         }
 267                         if (chdir(baseDestName) < 0) {
 268                                 perror_msg("chdir(%s)", baseSrcName);
 269                                 continue;
 270                         }
 271                         if ((d = getcwd(NULL, BUFSIZ + 1)) == NULL) {
 272                                 perror_msg("getcwd()");
 273                                 continue;
 274                         }
 275                         while (!state && *d != '\0') {
 276                                 if (stat(d, &sb) < 0) { /* stat not lstat - always dereference targets */
 277                                         perror_msg("stat(%s)", d);
 278                                         state = -1;
 279                                         continue;
 280                                 }
 281                                 if ((sb.st_ino == srcStatBuf.st_ino) &&
 282                                         (sb.st_dev == srcStatBuf.st_dev)) {
 283                                         error_msg("Cannot %s `%s' into a subdirectory of itself, "
 284                                                         "`%s/%s'\n", applet_name, baseSrcName,
 285                                                         baseDestName, baseSrcName);
 286                                         state = -1;
 287                                         continue;
 288                                 }
 289                                 if ((p = strrchr(d, '/')) != NULL) {
 290                                         *p = '\0';
 291                                 }
 292                         }
 293                         if (chdir(pushd) < 0) {
 294                                 perror_msg("chdir(%s)", pushd);
 295                                 free(pushd);
 296                                 free(d);
 297                                 continue;
 298                         }
 299                         free(pushd);
 300                         free(d);
 301                         if (state < 0)
 302                                 continue;
 303                         else
 304                                 fill_baseDest_buf(baseDestName, &baseDestLen);
 305                 }
 306                 status = setjmp(catch);
 307                 if (status == 0) {
 308                         mv_Action_first_time = 1;
 309                         if (recursive_action(baseSrcName,
 310                                                                 recursiveFlag, followLinks, FALSE,
 311                                                                 cp_mv_Action, cp_mv_Action, NULL) == FALSE) goto exit_false;
 312                         if (dz_i == is_mv &&
 313                                 recursive_action(baseSrcName,
 314                                                                 recursiveFlag, followLinks, TRUE,
 315                                                                 rm_Action, rm_Action, NULL) == FALSE) goto exit_false;
 316                 }
 317                 if (flags_memo)
 318                         *(baseDestName + baseDestLen) = '\0';
 319         }
 320         return EXIT_SUCCESS;
 321  exit_false:
 322         return EXIT_FAILURE;
 323 }
 324
 325 /*
 326 Local Variables:
 327 c-file-style: "linux"
 328 c-basic-offset: 4
 329 tab-width: 4
 330 End:
 331 */