1/*
2 * QString data type.
3 *
4 * Copyright (C) 2009 Red Hat Inc.
5 *
6 * Authors:
7 *  Luiz Capitulino <lcapitulino@redhat.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2.  See
10 * the COPYING file in the top-level directory.
11 */
12#include "qobject.h"
13#include "qstring.h"
14#include "qemu-common.h"
15
16static void qstring_destroy_obj(QObject *obj);
17
18static const QType qstring_type = {
19    .code = QTYPE_QSTRING,
20    .destroy = qstring_destroy_obj,
21};
22
23/**
24 * qstring_new(): Create a new empty QString
25 *
26 * Return strong reference.
27 */
28QString *qstring_new(void)
29{
30    return qstring_from_str("");
31}
32
33/**
34 * qstring_from_substr(): Create a new QString from a C string substring
35 *
36 * Return string reference
37 */
38QString *qstring_from_substr(const char *str, int start, int end)
39{
40    QString *qstring;
41
42    qstring = qemu_malloc(sizeof(*qstring));
43
44    qstring->length = end - start + 1;
45    qstring->capacity = qstring->length;
46
47    qstring->string = qemu_malloc(qstring->capacity + 1);
48    memcpy(qstring->string, str + start, qstring->length);
49    qstring->string[qstring->length] = 0;
50
51    QOBJECT_INIT(qstring, &qstring_type);
52
53    return qstring;
54}
55
56/**
57 * qstring_from_str(): Create a new QString from a regular C string
58 *
59 * Return strong reference.
60 */
61QString *qstring_from_str(const char *str)
62{
63    return qstring_from_substr(str, 0, strlen(str) - 1);
64}
65
66static void capacity_increase(QString *qstring, size_t len)
67{
68    if (qstring->capacity < (qstring->length + len)) {
69        qstring->capacity += len;
70        qstring->capacity *= 2; /* use exponential growth */
71
72        qstring->string = qemu_realloc(qstring->string, qstring->capacity + 1);
73    }
74}
75
76/* qstring_append(): Append a C string to a QString
77 */
78void qstring_append(QString *qstring, const char *str)
79{
80    size_t len = strlen(str);
81
82    capacity_increase(qstring, len);
83    memcpy(qstring->string + qstring->length, str, len);
84    qstring->length += len;
85    qstring->string[qstring->length] = 0;
86}
87
88void qstring_append_int(QString *qstring, int64_t value)
89{
90    char num[32];
91
92    snprintf(num, sizeof(num), "%" PRId64, value);
93    qstring_append(qstring, num);
94}
95
96/**
97 * qstring_append_chr(): Append a C char to a QString
98 */
99void qstring_append_chr(QString *qstring, int c)
100{
101    capacity_increase(qstring, 1);
102    qstring->string[qstring->length++] = c;
103    qstring->string[qstring->length] = 0;
104}
105
106/**
107 * qobject_to_qstring(): Convert a QObject to a QString
108 */
109QString *qobject_to_qstring(const QObject *obj)
110{
111    if (qobject_type(obj) != QTYPE_QSTRING)
112        return NULL;
113
114    return container_of(obj, QString, base);
115}
116
117/**
118 * qstring_get_str(): Return a pointer to the stored string
119 *
120 * NOTE: Should be used with caution, if the object is deallocated
121 * this pointer becomes invalid.
122 */
123const char *qstring_get_str(const QString *qstring)
124{
125    return qstring->string;
126}
127
128/**
129 * qstring_destroy_obj(): Free all memory allocated by a QString
130 * object
131 */
132static void qstring_destroy_obj(QObject *obj)
133{
134    QString *qs;
135
136    assert(obj != NULL);
137    qs = qobject_to_qstring(obj);
138    qemu_free(qs->string);
139    qemu_free(qs);
140}
141