Parent: [e2e7d3] (diff)

Child: [c6e228] (diff)

Download this file

copyfile.cpp    259 lines (223 with data), 6.7 kB

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
/* Copyright (C) 2005 J.F.Dockes
* 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.
*/
#ifndef TEST_COPYFILE
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <utime.h>
#include <cstring>
#include "copyfile.h"
#include "debuglog.h"
using namespace std;
#define CPBSIZ 8192
bool copyfile(const char *src, const char *dst, string &reason, int flags)
{
int sfd = -1;
int dfd = -1;
bool ret = false;
char buf[CPBSIZ];
int oflags = O_WRONLY|O_CREAT|O_TRUNC;
LOGDEB(("copyfile: %s to %s\n", src, dst));
if ((sfd = ::open(src, O_RDONLY)) < 0) {
reason += string("open ") + src + ": " + strerror(errno);
goto out;
}
if (flags & COPYFILE_EXCL) {
oflags |= O_EXCL;
}
if ((dfd = ::open(dst, oflags, 0644)) < 0) {
reason += string("open/creat ") + dst + ": " + strerror(errno);
// If we fail because of an open/truncate error, we do not
// want to unlink the file, we might succeed...
flags |= COPYFILE_NOERRUNLINK;
goto out;
}
for (;;) {
int didread;
didread = ::read(sfd, buf, CPBSIZ);
if (didread < 0) {
reason += string("read src ") + src + ": " + strerror(errno);
goto out;
}
if (didread == 0)
break;
if (::write(dfd, buf, didread) != didread) {
reason += string("write dst ") + src + ": " + strerror(errno);
goto out;
}
}
ret = true;
out:
if (ret == false && !(flags&COPYFILE_NOERRUNLINK))
::unlink(dst);
if (sfd >= 0)
::close(sfd);
if (dfd >= 0)
::close(dfd);
return ret;
}
bool stringtofile(const string& dt, const char *dst, string& reason,
int flags)
{
LOGDEB(("stringtofile:\n"));
int dfd = -1;
bool ret = false;
int oflags = O_WRONLY|O_CREAT|O_TRUNC;
LOGDEB(("stringtofile: %u bytes to %s\n", (unsigned int)dt.size(), dst));
if (flags & COPYFILE_EXCL) {
oflags |= O_EXCL;
}
if ((dfd = ::open(dst, oflags, 0644)) < 0) {
reason += string("open/creat ") + dst + ": " + strerror(errno);
// If we fail because of an open/truncate error, we do not
// want to unlink the file, we might succeed...
flags |= COPYFILE_NOERRUNLINK;
goto out;
}
if (::write(dfd, dt.c_str(), size_t(dt.size())) != ssize_t(dt.size())) {
reason += string("write dst ") + ": " + strerror(errno);
goto out;
}
ret = true;
out:
if (ret == false && !(flags&COPYFILE_NOERRUNLINK))
::unlink(dst);
if (dfd >= 0)
::close(dfd);
return ret;
}
bool renameormove(const char *src, const char *dst, string &reason)
{
// First try rename(2). If this succeeds we're done. If this fails
// with EXDEV, try to copy. Unix really should have a library function
// for this.
if (rename(src, dst) == 0) {
return true;
}
if (errno != EXDEV) {
reason += string("rename(2) failed: ") + strerror(errno);
return false;
}
struct stat st;
if (stat(src, &st) < 0) {
reason += string("Can't stat ") + src + " : " + strerror(errno);
return false;
}
if (!copyfile(src, dst, reason))
return false;
struct stat st1;
if (stat(dst, &st1) < 0) {
reason += string("Can't stat ") + dst + " : " + strerror(errno);
return false;
}
// Try to preserve modes, owner, times. This may fail for a number
// of reasons
if ((st1.st_mode & 0777) != (st.st_mode & 0777)) {
if (chmod(dst, st.st_mode&0777) != 0) {
reason += string("Chmod ") + dst + "Error : " + strerror(errno);
}
}
if (st.st_uid != st1.st_uid || st.st_gid != st1.st_gid) {
if (chown(dst, st.st_uid, st.st_gid) != 0) {
reason += string("Chown ") + dst + "Error : " + strerror(errno);
}
}
struct timeval times[2];
times[0].tv_sec = st.st_atime;
times[0].tv_usec = 0;
times[1].tv_sec = st.st_mtime;
times[1].tv_usec = 0;
utimes(dst, times);
// All ok, get rid of origin
if (unlink(src) < 0) {
reason += string("Can't unlink ") + src + "Error : " + strerror(errno);
}
return true;
}
#else
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string>
#include <iostream>
#include "copyfile.h"
using namespace std;
static int op_flags;
#define OPT_MOINS 0x1
#define OPT_m 0x2
#define OPT_e 0x4
static const char *thisprog;
static char usage [] =
"trcopyfile [-m] src dst\n"
" -m : move instead of copying\n"
" -e : fail if dest exists (only for copy)\n"
"\n"
;
static void
Usage(void)
{
fprintf(stderr, "%s: usage:\n%s", thisprog, usage);
exit(1);
}
int main(int argc, const char **argv)
{
thisprog = argv[0];
argc--; argv++;
while (argc > 0 && **argv == '-') {
(*argv)++;
if (!(**argv))
/* Cas du "adb - core" */
Usage();
while (**argv)
switch (*(*argv)++) {
case 'm': op_flags |= OPT_m; break;
case 'e': op_flags |= OPT_e; break;
default: Usage(); break;
}
argc--; argv++;
}
if (argc != 2)
Usage();
string src = *argv++;argc--;
string dst = *argv++;argc--;
bool ret;
string reason;
if (op_flags & OPT_m) {
ret = renameormove(src.c_str(), dst.c_str(), reason);
} else {
int flags = 0;
if (op_flags & OPT_e) {
flags |= COPYFILE_EXCL;
}
ret = copyfile(src.c_str(), dst.c_str(), reason, flags);
}
if (!ret) {
cerr << reason << endl;
exit(1);
} else {
cout << "Succeeded" << endl;
if (!reason.empty()) {
cout << "Warnings: " << reason << endl;
}
exit(0);
}
}
#endif