1 /**
2 * collectd - src/utils_subst.c
3 * Copyright (C) 2008 Sebastian Harl
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Authors:
19 * Sebastian "tokkee" Harl <sh at tokkee.org>
20 **/
22 /*
23 * This module provides functions for string substitution.
24 */
26 #include "collectd.h"
27 #include "common.h"
29 char *subst (char *buf, size_t buflen, const char *string, int off1, int off2,
30 const char *replacement)
31 {
32 char *buf_ptr = buf;
33 size_t len = buflen;
35 if ((NULL == buf) || (0 >= buflen) || (NULL == string)
36 || (0 > off1) || (0 > off2) || (off1 > off2)
37 || (NULL == replacement))
38 return NULL;
40 sstrncpy (buf_ptr, string, (off1 + 1 > buflen) ? buflen : off1 + 1);
41 buf_ptr += off1;
42 len -= off1;
44 if (0 >= len)
45 return buf;
47 sstrncpy (buf_ptr, replacement, len);
48 buf_ptr += strlen (replacement);
49 len -= strlen (replacement);
51 if (0 >= len)
52 return buf;
54 sstrncpy (buf_ptr, string + off2, len);
55 return buf;
56 } /* subst */
58 char *asubst (const char *string, int off1, int off2, const char *replacement)
59 {
60 char *buf;
61 int len;
63 char *ret;
65 if ((NULL == string) || (0 > off1) || (0 > off2) || (off1 > off2)
66 || (NULL ==replacement))
67 return NULL;
69 len = off1 + strlen (replacement) + strlen (string) - off2 + 1;
71 buf = (char *)malloc (len);
72 if (NULL == buf)
73 return NULL;
75 ret = subst (buf, len, string, off1, off2, replacement);
76 if (NULL == ret)
77 free (buf);
78 return ret;
79 } /* asubst */
81 /* vim: set sw=4 ts=4 tw=78 noexpandtab : */