| /* |
| * 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 "qemu/osdep.h" |
| #include "qapi/qmp/qstring.h" |
| |
| /** |
| * 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, size_t start, size_t end) |
| { |
| QString *qstring; |
| |
| assert(start <= end); |
| |
| qstring = g_malloc(sizeof(*qstring)); |
| qobject_init(QOBJECT(qstring), QTYPE_QSTRING); |
| |
| qstring->length = end - start; |
| qstring->capacity = qstring->length; |
| |
| assert(qstring->capacity < SIZE_MAX); |
| qstring->string = g_malloc(qstring->capacity + 1); |
| memcpy(qstring->string, str + start, qstring->length); |
| qstring->string[qstring->length] = 0; |
| |
| 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)); |
| } |
| |
| static void capacity_increase(QString *qstring, size_t len) |
| { |
| if (qstring->capacity < (qstring->length + len)) { |
| assert(len <= SIZE_MAX - qstring->capacity); |
| qstring->capacity += len; |
| assert(qstring->capacity <= SIZE_MAX / 2); |
| 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; |
| } |
| |
| /** |
| * 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_get_try_str(): Return a pointer to the stored string |
| * |
| * NOTE: will return NULL if qstring is not provided. |
| */ |
| const char *qstring_get_try_str(const QString *qstring) |
| { |
| return qstring ? qstring_get_str(qstring) : NULL; |
| } |
| |
| /** |
| * qobject_get_try_str(): Return a pointer to the corresponding string |
| * |
| * NOTE: the string will only be returned if the object is valid, and |
| * its type is QString, otherwise NULL is returned. |
| */ |
| const char *qobject_get_try_str(const QObject *qstring) |
| { |
| return qstring_get_try_str(qobject_to(QString, qstring)); |
| } |
| |
| /** |
| * qstring_is_equal(): Test whether the two QStrings are equal |
| */ |
| bool qstring_is_equal(const QObject *x, const QObject *y) |
| { |
| return !strcmp(qobject_to(QString, x)->string, |
| qobject_to(QString, y)->string); |
| } |
| |
| /** |
| * qstring_destroy_obj(): Free all memory allocated by a QString |
| * object |
| */ |
| void qstring_destroy_obj(QObject *obj) |
| { |
| QString *qs; |
| |
| assert(obj != NULL); |
| qs = qobject_to(QString, obj); |
| g_free(qs->string); |
| g_free(qs); |
| } |