strpool.c revision 178826 
1/*
2 * Copyright (c) 2005 Kungliga Tekniska H�gskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifdef HAVE_CONFIG_H
35#include <config.h>
36RCSID("$Id: strpool.c 21005 2007-06-08 01:54:35Z lha $");
37#endif
38
39#include <stdarg.h>
40#include <stdlib.h>
41#include "roken.h"
42
43struct rk_strpool {
44    char *str;
45    size_t len;
46};
47
48/*
49 *
50 */
51
52void ROKEN_LIB_FUNCTION
53rk_strpoolfree(struct rk_strpool *p)
54{
55    if (p->str) {
56	free(p->str);
57	p->str = NULL;
58    }
59    free(p);
60}
61
62/*
63 *
64 */
65
66struct rk_strpool * ROKEN_LIB_FUNCTION
67rk_strpoolprintf(struct rk_strpool *p, const char *fmt, ...)
68{
69    va_list ap;
70    char *str, *str2;
71    int len;
72
73    if (p == NULL) {
74	p = malloc(sizeof(*p));
75	if (p == NULL)
76	    return NULL;
77	p->str = NULL;
78	p->len = 0;
79    }
80    va_start(ap, fmt);
81    len = vasprintf(&str, fmt, ap);
82    va_end(ap);
83    if (str == NULL) {
84	rk_strpoolfree(p);
85	return NULL;
86    }
87    str2 = realloc(p->str, len + p->len + 1);
88    if (str2 == NULL) {
89	rk_strpoolfree(p);
90	return NULL;
91    }
92    p->str = str2;
93    memcpy(p->str + p->len, str, len + 1);
94    p->len += len;
95    free(str);
96    return p;
97}
98
99/*
100 *
101 */
102
103char * ROKEN_LIB_FUNCTION
104rk_strpoolcollect(struct rk_strpool *p)
105{
106    char *str = p->str;
107    p->str = NULL;
108    free(p);
109    return str;
110}
111