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
16 static void qstring_destroy_obj(QObject *obj);
17
18 static 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 */
qstring_new(void)28 QString *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 */
qstring_from_substr(const char * str,int start,int end)38 QString *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 */
qstring_from_str(const char * str)61 QString *qstring_from_str(const char *str)
62 {
63 return qstring_from_substr(str, 0, strlen(str) - 1);
64 }
65
capacity_increase(QString * qstring,size_t len)66 static 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 */
qstring_append(QString * qstring,const char * str)78 void 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
qstring_append_int(QString * qstring,int64_t value)88 void 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 */
qstring_append_chr(QString * qstring,int c)99 void 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 */
qobject_to_qstring(const QObject * obj)109 QString *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 */
qstring_get_str(const QString * qstring)123 const 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 */
qstring_destroy_obj(QObject * obj)132 static 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