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