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 "internal.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
  45 #define is_cp 0
  46 #define is_mv 1
  47 static int         dz_i;                /* index into cp_mv_usage */
  48 static const char *dz;                  /* dollar zero, .bss */
  49 static const char *cp_mv_usage[] =      /* .rodata */
  50 {
  51         "cp [OPTION]... SOURCE DEST\n"
  52                 "   or: cp [OPTION]... SOURCE... DIRECTORY\n"
  53 #ifndef BB_FEATURE_TRIVIAL_HELP
  54                 "\nCopies SOURCE to DEST, or multiple SOURCE(s) to DIRECTORY.\n"
  55                 "\n"
  56                 "\t-a\tSame as -dpR\n"
  57                 "\t-d\tPreserves links\n"
  58                 "\t-p\tPreserves file attributes if possible\n"
  59                 "\t-f\tforce (implied; ignored) - always set\n"
  60                 "\t-R\tCopies directories recursively\n"
  61 #endif
  62                 ,
  63         "mv SOURCE DEST\n"
  64                 "   or: mv SOURCE... DIRECTORY\n"
  65 #ifndef BB_FEATURE_TRIVIAL_HELP
  66                 "\nRename SOURCE to DEST, or move SOURCE(s) to DIRECTORY.\n"
  67 #endif
  68 };
  69
  70 static int recursiveFlag;
  71 static int followLinks;
  72 static int preserveFlag;
  73 static int forceFlag;
  74
  75 static const char *baseSrcName;
  76 static int                 srcDirFlag;
  77 static struct stat srcStatBuf;
  78
  79 static char                baseDestName[BUFSIZ + 1];
  80 static size_t      baseDestLen;
  81 static int                 destDirFlag;
  82 static struct stat destStatBuf;
  83
  84 static jmp_buf      catch;
  85 static volatile int mv_Action_first_time;
  86
  87 static void name_too_long__exit (void) __attribute__((noreturn));
  88
  89 static
  90 void name_too_long__exit (void)
  91 {
  92         fprintf(stderr, name_too_long, dz);
  93         exit FALSE;
  94 }
  95
  96 static void
  97 fill_baseDest_buf(char *_buf, size_t * _buflen) {
  98         const char *srcBasename;
  99         if ((srcBasename = strrchr(baseSrcName, '/')) == NULL) {
 100                 srcBasename = baseSrcName;
 101                 if (_buf[*_buflen - 1] != '/') {
 102                         if (++(*_buflen) > BUFSIZ)
 103                                 name_too_long__exit();
 104                         strcat(_buf, "/");
 105                 }
 106         }
 107         if (*_buflen + strlen(srcBasename) > BUFSIZ)
 108                 name_too_long__exit();
 109         strcat(_buf, srcBasename);
 110         return;
 111
 112 }
 113
 114 static int
 115 cp_mv_Action(const char *fileName, struct stat *statbuf, void* junk)
 116 {
 117         char            destName[BUFSIZ + 1];
 118         size_t          destLen;
 119         const char *srcBasename;
 120         char       *name;
 121
 122         strcpy(destName, baseDestName);
 123         destLen = strlen(destName);
 124
 125         if (srcDirFlag == TRUE) {
 126                 if (recursiveFlag == FALSE) {
 127                         fprintf(stderr, omitting_directory, dz, baseSrcName);
 128                         return TRUE;
 129                 }
 130                 srcBasename = (strstr(fileName, baseSrcName)
 131                                            + strlen(baseSrcName));
 132
 133                 if (destLen + strlen(srcBasename) > BUFSIZ) {
 134                         fprintf(stderr, name_too_long, dz);
 135                         return FALSE;
 136                 }
 137                 strcat(destName, srcBasename);
 138         }
 139         else if (destDirFlag == TRUE) {
 140                 fill_baseDest_buf(&destName[0], &destLen);
 141         }
 142         else {
 143                 srcBasename = baseSrcName;
 144         }
 145         if (mv_Action_first_time && (dz_i == is_mv)) {
 146                 mv_Action_first_time = errno = 0;
 147                 if (rename(fileName, destName) < 0 && errno != EXDEV) {
 148                         fprintf(stderr, "%s: rename(%s, %s): %s\n",
 149                                         dz, fileName, destName, strerror(errno));
 150                         goto do_copyFile;       /* Try anyway... */
 151                 }
 152                 else if (errno == EXDEV)
 153                         goto do_copyFile;
 154                 else
 155                         longjmp(catch, 1);      /* succeeded with rename() */
 156         }
 157  do_copyFile:
 158         if (preserveFlag == TRUE && statbuf->st_nlink > 1) {
 159                 if (is_in_ino_dev_hashtable(statbuf, &name)) {
 160                         if (link(name, destName) < 0) {
 161                                 fprintf(stderr, "%s: link(%s, %s): %s\n",
 162                                                 dz, name, destName, strerror(errno));
 163                                 return FALSE;
 164                         }
 165                         return TRUE;
 166                 }
 167                 else {
 168                         add_to_ino_dev_hashtable(statbuf, destName);
 169                 }
 170         }
 171         return copyFile(fileName, destName, preserveFlag, followLinks, forceFlag);
 172 }
 173
 174 static int
 175 rm_Action(const char *fileName, struct stat *statbuf, void* junk)
 176 {
 177         int status = TRUE;
 178
 179         if (S_ISDIR(statbuf->st_mode)) {
 180                 if (rmdir(fileName) < 0) {
 181                         fprintf(stderr, "%s: rmdir(%s): %s\n", dz, fileName, strerror(errno));
 182                         status = FALSE;
 183                 }
 184         } else if (unlink(fileName) < 0) {
 185                 fprintf(stderr, "%s: unlink(%s): %s\n", dz, fileName, strerror(errno));
 186                 status = FALSE;
 187         }
 188         return status;
 189 }
 190
 191 extern int cp_mv_main(int argc, char **argv)
 192 {
 193         dz = *argv;                                     /* already basename'd by busybox.c:main */
 194         if (*dz == 'c' && *(dz + 1) == 'p')
 195                 dz_i = is_cp;
 196         else
 197                 dz_i = is_mv;
 198         if (argc < 3)
 199                 usage(cp_mv_usage[dz_i]);
 200         argc--;
 201         argv++;
 202
 203         if (dz_i == is_cp) {
 204                 recursiveFlag = preserveFlag = forceFlag = FALSE;
 205                 followLinks = TRUE;
 206                 while (*argv && **argv == '-') {
 207                         while (*++(*argv)) {
 208                                 switch (**argv) {
 209                                 case 'a':
 210                                         followLinks = FALSE;
 211                                         preserveFlag = TRUE;
 212                                         recursiveFlag = TRUE;
 213                                         break;
 214                                 case 'd':
 215                                         followLinks = FALSE;
 216                                         break;
 217                                 case 'p':
 218                                         preserveFlag = TRUE;
 219                                         break;
 220                                 case 'R':
 221                                         recursiveFlag = TRUE;
 222                                         break;
 223                                 case 'f':
 224                                         forceFlag = TRUE;
 225                                         break;
 226                                 default:
 227                                         usage(cp_mv_usage[is_cp]);
 228                                 }
 229                         }
 230                         argc--;
 231                         argv++;
 232                 }
 233                 if (argc < 2) {
 234                         usage(cp_mv_usage[dz_i]);
 235                 }
 236         } else {                                        /* (dz_i == is_mv) */
 237                 recursiveFlag = preserveFlag = TRUE;
 238                 followLinks = FALSE;
 239         }
 240
 241
 242         if (strlen(argv[argc - 1]) > BUFSIZ) {
 243                 fprintf(stderr, name_too_long, "cp");
 244                 goto exit_false;
 245         }
 246         strcpy(baseDestName, argv[argc - 1]);
 247         baseDestLen = strlen(baseDestName);
 248         if (baseDestLen == 0)
 249                 goto exit_false;
 250
 251         destDirFlag = isDirectory(baseDestName, TRUE, &destStatBuf);
 252         if ((argc > 3) && destDirFlag == FALSE) {
 253                 fprintf(stderr, not_a_directory, "cp", baseDestName);
 254                 goto exit_false;
 255         }
 256
 257         while (argc-- > 1) {
 258                 size_t srcLen;
 259                 volatile int flags_memo;
 260                 int        status;
 261
 262                 baseSrcName = *(argv++);
 263
 264                 if ((srcLen = strlen(baseSrcName)) > BUFSIZ)
 265                         name_too_long__exit();
 266
 267                 if (srcLen == 0) continue; /* "" */
 268
 269                 srcDirFlag = isDirectory(baseSrcName, followLinks, &srcStatBuf);
 270
 271                 if ((flags_memo = (recursiveFlag == TRUE &&
 272                                                    srcDirFlag == TRUE && destDirFlag == TRUE))) {
 273
 274                         struct stat sb;
 275                         int                     state = 0;
 276                         char            *pushd, *d, *p;
 277
 278                         if ((pushd = getcwd(NULL, BUFSIZ + 1)) == NULL) {
 279                                 fprintf(stderr, "%s: getcwd(): %s\n", dz, strerror(errno));
 280                                 continue;
 281                         }
 282                         if (chdir(baseDestName) < 0) {
 283                                 fprintf(stderr, "%s: chdir(%s): %s\n", dz, baseSrcName, strerror(errno));
 284                                 continue;
 285                         }
 286                         if ((d = getcwd(NULL, BUFSIZ + 1)) == NULL) {
 287                                 fprintf(stderr, "%s: getcwd(): %s\n", dz, strerror(errno));
 288                                 continue;
 289                         }
 290                         while (!state && *d != '\0') {
 291                                 if (stat(d, &sb) < 0) { /* stat not lstat - always dereference targets */
 292                                         fprintf(stderr, "%s: stat(%s) :%s\n", dz, d, strerror(errno));
 293                                         state = -1;
 294                                         continue;
 295                                 }
 296                                 if ((sb.st_ino == srcStatBuf.st_ino) &&
 297                                         (sb.st_dev == srcStatBuf.st_dev)) {
 298                                         fprintf(stderr,
 299                                                         "%s: Cannot %s `%s' "
 300                                                         "into a subdirectory of itself, `%s/%s'\n",
 301                                                         dz, dz, baseSrcName, baseDestName, baseSrcName);
 302                                         state = -1;
 303                                         continue;
 304                                 }
 305                                 if ((p = strrchr(d, '/')) != NULL) {
 306                                         *p = '\0';
 307                                 }
 308                         }
 309                         if (chdir(pushd) < 0) {
 310                                 fprintf(stderr, "%s: chdir(%s): %s\n", dz, pushd, strerror(errno));
 311                                 free(pushd);
 312                                 free(d);
 313                                 continue;
 314                         }
 315                         free(pushd);
 316                         free(d);
 317                         if (state < 0)
 318                                 continue;
 319                         else
 320                                 fill_baseDest_buf(baseDestName, &baseDestLen);
 321                 }
 322                 status = setjmp(catch);
 323                 if (status == 0) {
 324                         mv_Action_first_time = 1;
 325                         if (recursiveAction(baseSrcName,
 326                                                                 recursiveFlag, followLinks, FALSE,
 327                                                                 cp_mv_Action, cp_mv_Action, NULL) == FALSE) goto exit_false;
 328                         if (dz_i == is_mv &&
 329                                 recursiveAction(baseSrcName,
 330                                                                 recursiveFlag, followLinks, TRUE,
 331                                                                 rm_Action, rm_Action, NULL) == FALSE) goto exit_false;
 332                 }
 333                 if (flags_memo)
 334                         *(baseDestName + baseDestLen) = '\0';
 335         }
 336 // exit_true:
 337         exit TRUE;
 338  exit_false:
 339         exit FALSE;
 340 }
 341
 342 /*
 343 Local Variables:
 344 c-file-style: "linux"
 345 c-basic-offset: 4
 346 tab-width: 4
 347 End:
 348 */