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
|
/*
* active port forwarder - software for secure forwarding
* Copyright (C) 2003-2007 jeremian <jeremian [at] poczta.fm>
*
* 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 <config.h>
#include <stdlib.h>
#include <string.h>
#include "string_functions.h"
/*
* Function name: string_cp
* Description: Firstly, the memory allocated for *dest is released. After this, new memory is allocated
* and string from src is copied to newly created location. *dest is pointing to new string.
* Arguments: dest - pointer to pointer to string previously allocated by malloc family functions.
* If dest is NULL, memory will be allocated and returned from the function. In the
* latter case dest will be unchanged
* src - string containing data for copying. If src is NULL, new memory is not allocated, but
* the old one is still released.
* Returns: The newly allocated string.
*/
char*
string_cp(char** dest, char* src)
{
char* tmp;
int len = 0;
/* 1. releasing memory allocated by *dest */
if (dest != NULL) {
if ((*dest) != NULL) {
/* if *dest points to the same memory as src - we shouldn't do anything */
if ((*dest) == src) {
return (*dest);
}
free((*dest));
(*dest) = NULL;
}
}
/* if src is null, there is nothing more to do */
if (src == NULL) {
return NULL;
}
/* 2. allocating new memory */
len = strlen(src);
tmp = calloc(1, len + 1);
if (tmp == NULL) {
return NULL;
}
/* 3. copying data from src */
strncpy(tmp, src, len);
if (dest != NULL) {
(*dest) = tmp;
}
return tmp;
}
|
