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