busybox/cp_mv.c

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/* vi: set sw=4 ts=4: */
/*
* Mini `cp' and `mv' implementation for BusyBox.
*
*
* Copyright (C) 1999 by Lineo, inc.
* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
*
* Copyright (C) 2000 by BitterSweet Enterprises, LLC. (GPL)
* Extensively modified and rewritten by Karl M. Hegbloom <karlheg@debian.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "internal.h"
#define BB_DECLARE_EXTERN
#define bb_need_name_too_long
#define bb_need_omitting_directory
#define bb_need_not_a_directory
#include "messages.c"
#include <stdio.h>
#include <time.h>
#include <utime.h>
#include <dirent.h>
#include <sys/param.h>
#include <setjmp.h> /* Ok to use this since `ash' does, therefore it's in the libc subset already. */
#include <string.h>
#include <unistd.h>
#include <errno.h>
#define is_cp 0
#define is_mv 1
static int dz_i; /* index into cp_mv_usage */
static const char *dz; /* dollar zero, .bss */
static const char *cp_mv_usage[] = /* .rodata */
{
"cp [OPTION]... SOURCE DEST\n"
" or: cp [OPTION]... SOURCE... DIRECTORY\n\n"
"Copy SOURCE to DEST, or multiple SOURCE(s) to DIRECTORY.\n"
"\n"
"\t-a\tsame as -dpR\n"
"\t-d\tpreserve links\n"
"\t-p\tpreserve file attributes if possible\n"
"\t-R\tcopy directories recursively\n",
"mv SOURCE DEST\n"
" or: mv SOURCE... DIRECTORY\n\n"
"Rename SOURCE to DEST, or move SOURCE(s) to DIRECTORY.\n"
};
static int recursiveFlag;
static int followLinks;
static int preserveFlag;
static const char *baseSrcName;
static int srcDirFlag;
static struct stat srcStatBuf;
static char baseDestName[PATH_MAX + 1];
static size_t baseDestLen;
static int destDirFlag;
static struct stat destStatBuf;
static jmp_buf catch;
static volatile int mv_Action_first_time;
static void name_too_long__exit (void) __attribute__((noreturn));
static
void name_too_long__exit (void)
{
fprintf(stderr, name_too_long, dz);
exit FALSE;
}
static void
fill_baseDest_buf(char *_buf, size_t * _buflen) {
const char *srcBasename;
if ((srcBasename = strrchr(baseSrcName, '/')) == NULL) {
srcBasename = baseSrcName;
if (_buf[*_buflen - 1] != '/') {
if (++(*_buflen) > PATH_MAX)
name_too_long__exit();
strcat(_buf, "/");
}
}
if (*_buflen + strlen(srcBasename) > PATH_MAX)
name_too_long__exit();
strcat(_buf, srcBasename);
return;
}
static int
cp_mv_Action(const char *fileName, struct stat *statbuf)
{
char destName[PATH_MAX + 1];
size_t destLen;
const char *srcBasename;
char *name;
strcpy(destName, baseDestName);
destLen = strlen(destName);
if (srcDirFlag == TRUE) {
if (recursiveFlag == FALSE) {
fprintf(stderr, omitting_directory, dz, baseSrcName);
return TRUE;
}
srcBasename = (strstr(fileName, baseSrcName)
+ strlen(baseSrcName));
if (destLen + strlen(srcBasename) > PATH_MAX) {
fprintf(stderr, name_too_long, dz);
return FALSE;
}
strcat(destName, srcBasename);
}
else if (destDirFlag == TRUE) {
fill_baseDest_buf(&destName[0], &destLen);
}
else {
srcBasename = baseSrcName;
}
if (mv_Action_first_time && (dz_i == is_mv)) {
mv_Action_first_time = errno = 0;
if (rename(fileName, destName) < 0 && errno != EXDEV) {
fprintf(stderr, "%s: rename(%s, %s): %s\n",
dz, fileName, destName, strerror(errno));
goto do_copyFile; /* Try anyway... */
}
else if (errno == EXDEV)
goto do_copyFile;
else
longjmp(catch, 1); /* succeeded with rename() */
}
do_copyFile:
if (preserveFlag == TRUE && statbuf->st_nlink > 1) {
if (is_in_ino_dev_hashtable(statbuf, &name)) {
if (link(name, destName) < 0) {
fprintf(stderr, "%s: link(%s, %s): %s\n",
dz, name, destName, strerror(errno));
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return FALSE;
}
return TRUE;
}
else {
add_to_ino_dev_hashtable(statbuf, destName);
}
}
return copyFile(fileName, destName, preserveFlag, followLinks);
}
static int
rm_Action(const char *fileName, struct stat *statbuf)
{
int status = TRUE;
if (S_ISDIR(statbuf->st_mode)) {
if (rmdir(fileName) < 0) {
fprintf(stderr, "%s: rmdir(%s): %s\n", dz, fileName, strerror(errno));
status = FALSE;
}
} else if (unlink(fileName) < 0) {
fprintf(stderr, "%s: unlink(%s): %s\n", dz, fileName, strerror(errno));
status = FALSE;
}
return status;
}
extern int cp_mv_main(int argc, char **argv)
{
dz = *argv; /* already basename'd by busybox.c:main */
if (*dz == 'c' && *(dz + 1) == 'p')
dz_i = is_cp;
else
dz_i = is_mv;
if (argc < 3)
usage(cp_mv_usage[dz_i]);
argc--;
argv++;
if (dz_i == is_cp) {
recursiveFlag = preserveFlag = FALSE;
followLinks = TRUE;
while (**argv == '-') {
while (*++(*argv)) {
switch (**argv) {
case 'a':
followLinks = FALSE;
preserveFlag = TRUE;
recursiveFlag = TRUE;
break;
case 'd':
followLinks = FALSE;
break;
case 'p':
preserveFlag = TRUE;
break;
case 'R':
recursiveFlag = TRUE;
break;
default:
usage(cp_mv_usage[is_cp]);
}
}
argc--;
argv++;
}
} else { /* (dz_i == is_mv) */
recursiveFlag = preserveFlag = TRUE;
followLinks = FALSE;
}
if (strlen(argv[argc - 1]) > PATH_MAX) {
fprintf(stderr, name_too_long, "cp");
goto exit_false;
}
strcpy(baseDestName, argv[argc - 1]);
baseDestLen = strlen(baseDestName);
if (baseDestLen == 0)
goto exit_false;
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destDirFlag = isDirectory(baseDestName, TRUE, &destStatBuf);
if ((argc > 3) && destDirFlag == FALSE) {
fprintf(stderr, not_a_directory, "cp", baseDestName);
goto exit_false;
}
while (argc-- > 1) {
size_t srcLen;
volatile int flags_memo;
int status;
baseSrcName = *(argv++);
if ((srcLen = strlen(baseSrcName)) > PATH_MAX)
name_too_long__exit();
if (srcLen == 0) continue; /* "" */
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srcDirFlag = isDirectory(baseSrcName, followLinks, &srcStatBuf);
if ((flags_memo = (recursiveFlag == TRUE &&
srcDirFlag == TRUE && destDirFlag == TRUE))) {
struct stat sb;
int state = 0;
char *pushd, *d, *p;
if ((pushd = getcwd(NULL, PATH_MAX + 1)) == NULL) {
fprintf(stderr, "%s: getcwd(): %s\n", dz, strerror(errno));
continue;
}
if (chdir(baseDestName) < 0) {
fprintf(stderr, "%s: chdir(%s): %s\n", dz, baseSrcName, strerror(errno));
continue;
}
if ((d = getcwd(NULL, PATH_MAX + 1)) == NULL) {
fprintf(stderr, "%s: getcwd(): %s\n", dz, strerror(errno));
continue;
}
while (!state && *d != '\0') {
if (stat(d, &sb) < 0) { /* stat not lstat - always dereference targets */
fprintf(stderr, "%s: stat(%s) :%s\n", dz, d, strerror(errno));
state = -1;
continue;
}
if ((sb.st_ino == srcStatBuf.st_ino) &&
(sb.st_dev == srcStatBuf.st_dev)) {
fprintf(stderr,
"%s: Cannot %s `%s' "
"into a subdirectory of itself, `%s/%s'\n",
dz, dz, baseSrcName, baseDestName, baseSrcName);
state = -1;
continue;
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}
if ((p = strrchr(d, '/')) != NULL) {
*p = '\0';
}
}
if (chdir(pushd) < 0) {
fprintf(stderr, "%s: chdir(%s): %s\n", dz, pushd, strerror(errno));
free(pushd);
free(d);
continue;
}
free(pushd);
free(d);
if (state < 0)
continue;
else
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fill_baseDest_buf(baseDestName, &baseDestLen);
}
status = setjmp(catch);
if (status == 0) {
mv_Action_first_time = 1;
if (recursiveAction(baseSrcName,
recursiveFlag, followLinks, FALSE,
cp_mv_Action, cp_mv_Action) == FALSE) goto exit_false;
if (dz_i == is_mv &&
recursiveAction(baseSrcName,
recursiveFlag, followLinks, TRUE,
rm_Action, rm_Action) == FALSE) goto exit_false;
}
if (flags_memo)
*(baseDestName + baseDestLen) = '\0';
}
// exit_true:
exit TRUE;
exit_false:
exit FALSE;
}
/*
Local Variables:
c-file-style: "linux"
c-basic-offset: 4
tab-width: 4
End:
*/