d195325b05
Don't overwrite / leak previously set errors. Make traversal cope with missing mandatory sub-structs. Don't try to end a container that could not be started. v1->v2: - unchanged v2->v3: - instead of examining, assert that we never overwrite errors with error_set() - allow visitors to set a NULL struct pointer successfully, so traversal of incomplete objects can continue - check for a NULL "obj" before accessing "(*obj)->has_XXX" (this is not a typo, "obj != NULL" implies "*obj != NULL" here) - fix start_struct / end_struct balance for unions as well Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
161 lines
3 KiB
C
161 lines
3 KiB
C
/*
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* QEMU Error Objects
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*
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* Copyright IBM, Corp. 2011
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2. See
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* the COPYING.LIB file in the top-level directory.
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*/
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#include "qemu-common.h"
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#include "error.h"
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#include "qjson.h"
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#include "qdict.h"
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#include "error_int.h"
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#include "qerror.h"
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struct Error
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{
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QDict *obj;
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const char *fmt;
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char *msg;
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};
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void error_set(Error **errp, const char *fmt, ...)
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{
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Error *err;
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va_list ap;
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if (errp == NULL) {
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return;
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}
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assert(*errp == NULL);
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err = g_malloc0(sizeof(*err));
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va_start(ap, fmt);
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err->obj = qobject_to_qdict(qobject_from_jsonv(fmt, &ap));
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va_end(ap);
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err->fmt = fmt;
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*errp = err;
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}
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Error *error_copy(const Error *err)
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{
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Error *err_new;
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err_new = g_malloc0(sizeof(*err));
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err_new->msg = g_strdup(err->msg);
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err_new->fmt = err->fmt;
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err_new->obj = err->obj;
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QINCREF(err_new->obj);
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return err_new;
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}
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bool error_is_set(Error **errp)
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{
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return (errp && *errp);
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}
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const char *error_get_pretty(Error *err)
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{
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if (err->msg == NULL) {
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QString *str;
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str = qerror_format(err->fmt, err->obj);
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err->msg = g_strdup(qstring_get_str(str));
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QDECREF(str);
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}
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return err->msg;
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}
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const char *error_get_field(Error *err, const char *field)
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{
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if (strcmp(field, "class") == 0) {
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return qdict_get_str(err->obj, field);
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} else {
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QDict *dict = qdict_get_qdict(err->obj, "data");
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return qdict_get_str(dict, field);
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}
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}
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QDict *error_get_data(Error *err)
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{
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QDict *data = qdict_get_qdict(err->obj, "data");
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QINCREF(data);
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return data;
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}
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void error_set_field(Error *err, const char *field, const char *value)
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{
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QDict *dict = qdict_get_qdict(err->obj, "data");
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qdict_put(dict, field, qstring_from_str(value));
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}
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void error_free(Error *err)
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{
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if (err) {
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QDECREF(err->obj);
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g_free(err->msg);
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g_free(err);
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}
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}
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bool error_is_type(Error *err, const char *fmt)
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{
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const char *error_class;
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char *ptr;
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char *end;
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if (!err) {
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return false;
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}
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ptr = strstr(fmt, "'class': '");
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assert(ptr != NULL);
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ptr += strlen("'class': '");
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end = strchr(ptr, '\'');
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assert(end != NULL);
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error_class = error_get_field(err, "class");
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if (strlen(error_class) != end - ptr) {
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return false;
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}
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return strncmp(ptr, error_class, end - ptr) == 0;
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}
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void error_propagate(Error **dst_err, Error *local_err)
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{
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if (dst_err && !*dst_err) {
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*dst_err = local_err;
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} else if (local_err) {
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error_free(local_err);
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}
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}
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QObject *error_get_qobject(Error *err)
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{
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QINCREF(err->obj);
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return QOBJECT(err->obj);
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}
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void error_set_qobject(Error **errp, QObject *obj)
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{
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Error *err;
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if (errp == NULL) {
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return;
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}
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err = g_malloc0(sizeof(*err));
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err->obj = qobject_to_qdict(obj);
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qobject_incref(obj);
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*errp = err;
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}
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