2 * collectd - src/utils_subst.c
3 * Copyright (C) 2008 Sebastian Harl
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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10 * Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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21 * DEALINGS IN THE SOFTWARE.
24 * Sebastian "tokkee" Harl <sh at tokkee.org>
28 * This module provides functions for string substitution.
34 char *subst (char *buf, size_t buflen, const char *string, size_t off1, size_t off2,
35 const char *replacement)
42 size_t replacement_len;
45 if ((NULL == buf) || (0 == buflen) || (NULL == string) || (NULL == replacement))
48 size_t string_len = strlen (string);
49 if ((off1 > string_len) || (off2 > string_len) || (off1 > off2))
55 replacement_len = strlen (replacement);
56 back_len = strlen (back);
58 if (front_len >= buflen) {
59 front_len = buflen - 1;
62 } else if ((front_len + replacement_len) >= buflen) {
63 replacement_len = buflen - (front_len + 1);
65 } else if ((front_len + replacement_len + back_len) >= buflen) {
66 back_len = buflen - (front_len + replacement_len + 1);
68 buflen = front_len + replacement_len + back_len + 1;
70 assert ((front_len + replacement_len + back_len) == (buflen - 1));
73 sstrncpy (out, front, front_len + 1);
77 if (replacement_len != 0) {
78 sstrncpy (out, replacement, replacement_len + 1);
79 out += replacement_len;
83 sstrncpy (out, back, back_len + 1);
91 char *asubst (const char *string, int off1, int off2, const char *replacement)
98 if ((NULL == string) || (0 > off1) || (0 > off2) || (off1 > off2)
99 || (NULL ==replacement))
102 len = off1 + strlen (replacement) + strlen (string) - off2 + 1;
104 buf = (char *)malloc (len);
108 ret = subst (buf, len, string, off1, off2, replacement);
114 char *subst_string (char *buf, size_t buflen, const char *string,
115 const char *needle, const char *replacement)
120 if ((buf == NULL) || (string == NULL)
121 || (needle == NULL) || (replacement == NULL))
124 needle_len = strlen (needle);
125 sstrncpy (buf, string, buflen);
127 /* Limit the loop to prevent endless loops. */
128 for (i = 0; i < buflen; i++)
134 /* Find `needle' in `buf'. */
135 begin_ptr = strstr (buf, needle);
136 if (begin_ptr == NULL)
139 /* Calculate the start offset. */
140 begin = begin_ptr - buf;
142 /* Substitute the region using `subst'. The result is stored in
144 begin_ptr = subst (temp, buflen, buf,
145 begin, begin + needle_len,
147 if (begin_ptr == NULL)
149 WARNING ("subst_string: subst failed.");
153 /* Copy the new string in `temp' to `buf' for the next round. */
154 strncpy (buf, temp, buflen);
159 WARNING ("subst_string: Loop exited after %zu iterations: "
160 "string = %s; needle = %s; replacement = %s;",
161 i, string, needle, replacement);
165 } /* char *subst_string */
167 /* vim: set sw=4 ts=4 tw=78 noexpandtab : */