s390x/sclpconsole-lm: Fix hanging SCLP line mode console
[qemu.git] / qobject / qstring.c
1 /*
2 * QString Module
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 LGPL, version 2.1 or later.
10 * See the COPYING.LIB file in the top-level directory.
11 */
12
13 #include "qapi/qmp/qobject.h"
14 #include "qapi/qmp/qstring.h"
15 #include "qemu-common.h"
16
17 static void qstring_destroy_obj(QObject *obj);
18
19 static const QType qstring_type = {
20 .code = QTYPE_QSTRING,
21 .destroy = qstring_destroy_obj,
22 };
23
24 /**
25 * qstring_new(): Create a new empty QString
26 *
27 * Return strong reference.
28 */
29 QString *qstring_new(void)
30 {
31 return qstring_from_str("");
32 }
33
34 /**
35 * qstring_get_length(): Get the length of a QString
36 */
37 size_t qstring_get_length(const QString *qstring)
38 {
39 return qstring->length;
40 }
41
42 /**
43 * qstring_from_substr(): Create a new QString from a C string substring
44 *
45 * Return string reference
46 */
47 QString *qstring_from_substr(const char *str, int start, int end)
48 {
49 QString *qstring;
50
51 qstring = g_malloc(sizeof(*qstring));
52
53 qstring->length = end - start + 1;
54 qstring->capacity = qstring->length;
55
56 qstring->string = g_malloc(qstring->capacity + 1);
57 memcpy(qstring->string, str + start, qstring->length);
58 qstring->string[qstring->length] = 0;
59
60 QOBJECT_INIT(qstring, &qstring_type);
61
62 return qstring;
63 }
64
65 /**
66 * qstring_from_str(): Create a new QString from a regular C string
67 *
68 * Return strong reference.
69 */
70 QString *qstring_from_str(const char *str)
71 {
72 return qstring_from_substr(str, 0, strlen(str) - 1);
73 }
74
75 static void capacity_increase(QString *qstring, size_t len)
76 {
77 if (qstring->capacity < (qstring->length + len)) {
78 qstring->capacity += len;
79 qstring->capacity *= 2; /* use exponential growth */
80
81 qstring->string = g_realloc(qstring->string, qstring->capacity + 1);
82 }
83 }
84
85 /* qstring_append(): Append a C string to a QString
86 */
87 void qstring_append(QString *qstring, const char *str)
88 {
89 size_t len = strlen(str);
90
91 capacity_increase(qstring, len);
92 memcpy(qstring->string + qstring->length, str, len);
93 qstring->length += len;
94 qstring->string[qstring->length] = 0;
95 }
96
97 void qstring_append_int(QString *qstring, int64_t value)
98 {
99 char num[32];
100
101 snprintf(num, sizeof(num), "%" PRId64, value);
102 qstring_append(qstring, num);
103 }
104
105 /**
106 * qstring_append_chr(): Append a C char to a QString
107 */
108 void qstring_append_chr(QString *qstring, int c)
109 {
110 capacity_increase(qstring, 1);
111 qstring->string[qstring->length++] = c;
112 qstring->string[qstring->length] = 0;
113 }
114
115 /**
116 * qobject_to_qstring(): Convert a QObject to a QString
117 */
118 QString *qobject_to_qstring(const QObject *obj)
119 {
120 if (qobject_type(obj) != QTYPE_QSTRING)
121 return NULL;
122
123 return container_of(obj, QString, base);
124 }
125
126 /**
127 * qstring_get_str(): Return a pointer to the stored string
128 *
129 * NOTE: Should be used with caution, if the object is deallocated
130 * this pointer becomes invalid.
131 */
132 const char *qstring_get_str(const QString *qstring)
133 {
134 return qstring->string;
135 }
136
137 /**
138 * qstring_destroy_obj(): Free all memory allocated by a QString
139 * object
140 */
141 static void qstring_destroy_obj(QObject *obj)
142 {
143 QString *qs;
144
145 assert(obj != NULL);
146 qs = qobject_to_qstring(obj);
147 g_free(qs->string);
148 g_free(qs);
149 }