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Diffstat (limited to 'qemu/qobject/qstring.c')
-rw-r--r-- | qemu/qobject/qstring.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/qemu/qobject/qstring.c b/qemu/qobject/qstring.c new file mode 100644 index 000000000..607b7a142 --- /dev/null +++ b/qemu/qobject/qstring.c @@ -0,0 +1,149 @@ +/* + * 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); +} |