1/*
2 * Copyright 2016 Jakub Klama <jceel@FreeBSD.org>
3 * All rights reserved
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted providing that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
22 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
23 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24 * POSSIBILITY OF SUCH DAMAGE.
25 *
26 */
27
28/*
29 * Minimal libsbuf reimplementation for Mac OS X.
30 */
31
32#include <stdlib.h>
33#include <unistd.h>
34#include <string.h>
35#include <stdarg.h>
36#include <stdio.h>
37#include "sbuf.h"
38
39#define	SBUF_INITIAL_SIZE	128
40
41struct sbuf *
42sbuf_new_auto()
43{
44	struct sbuf *s;
45
46	s = malloc(sizeof(struct sbuf));
47	s->s_buf = calloc(1, SBUF_INITIAL_SIZE + 1);
48	s->s_capacity = s->s_buf != NULL ? SBUF_INITIAL_SIZE : 0;
49	s->s_size = 0;
50
51	return (s);
52}
53
54int
55sbuf_cat(struct sbuf *s, const char *str)
56{
57	int req = (int)strlen(str);
58
59	if (s->s_size + req >= s->s_capacity) {
60		s->s_capacity = s->s_size + req + 1;
61		s->s_buf = realloc(s->s_buf, (size_t)s->s_capacity);
62	}
63	if (s->s_buf == NULL)
64		return (-1);
65
66	strcpy(s->s_buf + s->s_size, str);
67	s->s_size += req;
68
69	return (0);
70}
71
72int
73sbuf_printf(struct sbuf *s, const char *fmt, ...)
74{
75	int ret;
76	va_list ap;
77
78	va_start(ap, fmt);
79	ret = sbuf_vprintf(s, fmt, ap);
80	va_end(ap);
81
82	return (ret);
83}
84
85int
86sbuf_vprintf(struct sbuf *s, const char *fmt, va_list args)
87{
88	va_list copy;
89	int req;
90
91	va_copy(copy, args);
92	req = vsnprintf(NULL, 0, fmt, copy);
93	va_end(copy);
94
95	if (s->s_size + req >= s->s_capacity) {
96		s->s_capacity = s->s_size + req + 1;
97		s->s_buf = realloc(s->s_buf, (size_t)s->s_capacity);
98	}
99	if (s->s_buf == NULL)
100		return (-1);
101
102	req = vsnprintf(s->s_buf + s->s_size, req + 1, fmt, args);
103	s->s_size += req;
104
105	return (0);
106}
107
108char *
109sbuf_data(struct sbuf *s)
110{
111	return (s->s_buf);
112}
113
114int
115sbuf_finish(struct sbuf *s)
116{
117	if (s->s_buf != NULL)
118		s->s_buf[s->s_size] = '\0';
119	return (0);
120}
121
122void
123sbuf_delete(struct sbuf *s)
124{
125	free(s->s_buf);
126	free(s);
127}
128