mirror of https://gitee.com/openkylin/qemu.git
142 lines
3.1 KiB
C
142 lines
3.1 KiB
C
/*
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* QString Module
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*
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* Copyright (C) 2009 Red Hat Inc.
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*
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* Authors:
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* Luiz Capitulino <lcapitulino@redhat.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*/
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#include "qobject.h"
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#include "qstring.h"
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#include "qemu-common.h"
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static void qstring_destroy_obj(QObject *obj);
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static const QType qstring_type = {
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.code = QTYPE_QSTRING,
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.destroy = qstring_destroy_obj,
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};
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/**
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* qstring_new(): Create a new empty QString
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*
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* Return strong reference.
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*/
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QString *qstring_new(void)
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{
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return qstring_from_str("");
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}
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/**
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* qstring_from_substr(): Create a new QString from a C string substring
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*
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* Return string reference
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*/
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QString *qstring_from_substr(const char *str, int start, int end)
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{
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QString *qstring;
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qstring = qemu_malloc(sizeof(*qstring));
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qstring->length = end - start + 1;
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qstring->capacity = qstring->length;
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qstring->string = qemu_malloc(qstring->capacity + 1);
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memcpy(qstring->string, str + start, qstring->length);
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qstring->string[qstring->length] = 0;
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QOBJECT_INIT(qstring, &qstring_type);
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return qstring;
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}
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/**
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* qstring_from_str(): Create a new QString from a regular C string
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*
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* Return strong reference.
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*/
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QString *qstring_from_str(const char *str)
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{
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return qstring_from_substr(str, 0, strlen(str) - 1);
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}
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static void capacity_increase(QString *qstring, size_t len)
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{
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if (qstring->capacity < (qstring->length + len)) {
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qstring->capacity += len;
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qstring->capacity *= 2; /* use exponential growth */
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qstring->string = qemu_realloc(qstring->string, qstring->capacity + 1);
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}
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}
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/* qstring_append(): Append a C string to a QString
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*/
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void qstring_append(QString *qstring, const char *str)
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{
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size_t len = strlen(str);
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capacity_increase(qstring, len);
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memcpy(qstring->string + qstring->length, str, len);
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qstring->length += len;
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qstring->string[qstring->length] = 0;
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}
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void qstring_append_int(QString *qstring, int64_t value)
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{
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char num[32];
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snprintf(num, sizeof(num), "%" PRId64, value);
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qstring_append(qstring, num);
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}
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/**
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* qstring_append_chr(): Append a C char to a QString
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*/
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void qstring_append_chr(QString *qstring, int c)
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{
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capacity_increase(qstring, 1);
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qstring->string[qstring->length++] = c;
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qstring->string[qstring->length] = 0;
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}
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/**
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* qobject_to_qstring(): Convert a QObject to a QString
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*/
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QString *qobject_to_qstring(const QObject *obj)
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{
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if (qobject_type(obj) != QTYPE_QSTRING)
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return NULL;
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return container_of(obj, QString, base);
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}
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/**
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* qstring_get_str(): Return a pointer to the stored string
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*
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* NOTE: Should be used with caution, if the object is deallocated
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* this pointer becomes invalid.
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*/
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const char *qstring_get_str(const QString *qstring)
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{
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return qstring->string;
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}
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/**
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* qstring_destroy_obj(): Free all memory allocated by a QString
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* object
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*/
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static void qstring_destroy_obj(QObject *obj)
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{
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QString *qs;
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assert(obj != NULL);
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qs = qobject_to_qstring(obj);
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qemu_free(qs->string);
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qemu_free(qs);
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}
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