source: git/trunk/src/str.c @ 7bb8184

Last change on this file since 7bb8184 was 7bb8184, checked in by Olly Betts <olly@…>, 13 years ago

Retagging 1.2.0

git-svn-id: file:///home/survex-svn/survex/tags/1.2.0@3664 4b37db11-9a0c-4f06-9ece-9ab7cdaee568

  • Property mode set to 100644
File size: 1.7 KB
Line 
1/* append a string */
2/* Copyright (c) Olly Betts 1999
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
17 */
18
19#include <string.h>
20
21#include "osalloc.h"
22#include "str.h"
23
24/* append a string */
25void
26s_cat(char **pstr, int *plen, char *s)
27{
28   int new_len = strlen(s) + 1; /* extra 1 for nul */
29   int len = 0;
30
31   if (*pstr) {
32      len = strlen(*pstr);
33      new_len += len;
34   }
35
36   if (!*pstr || new_len > *plen) {
37      *plen = (new_len + 32) & ~3;
38      *pstr = osrealloc(*pstr, *plen);
39   }
40
41   strcpy(*pstr + len, s);
42}
43
44/* append a character */
45void
46s_catchar(char **pstr, int *plen, char ch)
47{
48   int new_len = 2; /* extra 1 for nul */
49   int len = 0;
50
51   if (*pstr) {
52      len = strlen(*pstr);
53      new_len += len;
54   }
55
56   if (!*pstr || new_len > *plen) {
57      *plen = (new_len + 32) & ~3;
58      *pstr = osrealloc(*pstr, *plen);
59   }
60
61   (*pstr)[len] = ch;
62   (*pstr)[len + 1] = '\0';
63}
64
65/* truncate string to zero length */
66void
67s_zero(char **pstr)
68{
69   if (*pstr) **pstr = '\0';
70}
71
72void
73s_free(char **pstr)
74{
75   if (*pstr) {
76      osfree(*pstr);
77      *pstr = NULL;
78   }
79}
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