qemu/qapi/string-input-visitor.c

379 lines
9.0 KiB
C

/*
* String parsing visitor
*
* Copyright Red Hat, Inc. 2012-2016
*
* Author: Paolo Bonzini <pbonzini@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/error.h"
#include "qemu-common.h"
#include "qapi/string-input-visitor.h"
#include "qapi/visitor-impl.h"
#include "qapi/qmp/qerror.h"
#include "qapi/qmp/qnull.h"
#include "qemu/option.h"
#include "qemu/queue.h"
#include "qemu/range.h"
struct StringInputVisitor
{
Visitor visitor;
GList *ranges;
GList *cur_range;
int64_t cur;
const char *string;
void *list; /* Only needed for sanity checking the caller */
};
static StringInputVisitor *to_siv(Visitor *v)
{
return container_of(v, StringInputVisitor, visitor);
}
static void free_range(void *range, void *dummy)
{
g_free(range);
}
static int parse_str(StringInputVisitor *siv, const char *name, Error **errp)
{
char *str = (char *) siv->string;
long long start, end;
Range *cur;
char *endptr;
if (siv->ranges) {
return 0;
}
if (!*str) {
return 0;
}
do {
errno = 0;
start = strtoll(str, &endptr, 0);
if (errno == 0 && endptr > str) {
if (*endptr == '\0') {
cur = g_malloc0(sizeof(*cur));
range_set_bounds(cur, start, start);
siv->ranges = range_list_insert(siv->ranges, cur);
cur = NULL;
str = NULL;
} else if (*endptr == '-') {
str = endptr + 1;
errno = 0;
end = strtoll(str, &endptr, 0);
if (errno == 0 && endptr > str && start <= end &&
(start > INT64_MAX - 65536 ||
end < start + 65536)) {
if (*endptr == '\0') {
cur = g_malloc0(sizeof(*cur));
range_set_bounds(cur, start, end);
siv->ranges = range_list_insert(siv->ranges, cur);
cur = NULL;
str = NULL;
} else if (*endptr == ',') {
str = endptr + 1;
cur = g_malloc0(sizeof(*cur));
range_set_bounds(cur, start, end);
siv->ranges = range_list_insert(siv->ranges, cur);
cur = NULL;
} else {
goto error;
}
} else {
goto error;
}
} else if (*endptr == ',') {
str = endptr + 1;
cur = g_malloc0(sizeof(*cur));
range_set_bounds(cur, start, start);
siv->ranges = range_list_insert(siv->ranges, cur);
cur = NULL;
} else {
goto error;
}
} else {
goto error;
}
} while (str);
return 0;
error:
g_list_foreach(siv->ranges, free_range, NULL);
g_list_free(siv->ranges);
siv->ranges = NULL;
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name ? name : "null",
"an int64 value or range");
return -1;
}
static void
start_list(Visitor *v, const char *name, GenericList **list, size_t size,
Error **errp)
{
StringInputVisitor *siv = to_siv(v);
/* We don't support visits without a list */
assert(list);
siv->list = list;
if (parse_str(siv, name, errp) < 0) {
*list = NULL;
return;
}
siv->cur_range = g_list_first(siv->ranges);
if (siv->cur_range) {
Range *r = siv->cur_range->data;
if (r) {
siv->cur = range_lob(r);
}
*list = g_malloc0(size);
} else {
*list = NULL;
}
}
static GenericList *next_list(Visitor *v, GenericList *tail, size_t size)
{
StringInputVisitor *siv = to_siv(v);
Range *r;
if (!siv->ranges || !siv->cur_range) {
return NULL;
}
r = siv->cur_range->data;
if (!r) {
return NULL;
}
if (!range_contains(r, siv->cur)) {
siv->cur_range = g_list_next(siv->cur_range);
if (!siv->cur_range) {
return NULL;
}
r = siv->cur_range->data;
if (!r) {
return NULL;
}
siv->cur = range_lob(r);
}
tail->next = g_malloc0(size);
return tail->next;
}
static void check_list(Visitor *v, Error **errp)
{
const StringInputVisitor *siv = to_siv(v);
Range *r;
GList *cur_range;
if (!siv->ranges || !siv->cur_range) {
return;
}
r = siv->cur_range->data;
if (!r) {
return;
}
if (!range_contains(r, siv->cur)) {
cur_range = g_list_next(siv->cur_range);
if (!cur_range) {
return;
}
r = cur_range->data;
if (!r) {
return;
}
}
error_setg(errp, "Range contains too many values");
}
static void end_list(Visitor *v, void **obj)
{
StringInputVisitor *siv = to_siv(v);
assert(siv->list == obj);
}
static void parse_type_int64(Visitor *v, const char *name, int64_t *obj,
Error **errp)
{
StringInputVisitor *siv = to_siv(v);
if (parse_str(siv, name, errp) < 0) {
return;
}
if (!siv->ranges) {
goto error;
}
if (!siv->cur_range) {
Range *r;
siv->cur_range = g_list_first(siv->ranges);
if (!siv->cur_range) {
goto error;
}
r = siv->cur_range->data;
if (!r) {
goto error;
}
siv->cur = range_lob(r);
}
*obj = siv->cur;
siv->cur++;
return;
error:
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name ? name : "null",
"an int64 value or range");
}
static void parse_type_uint64(Visitor *v, const char *name, uint64_t *obj,
Error **errp)
{
/* FIXME: parse_type_int64 mishandles values over INT64_MAX */
int64_t i;
Error *err = NULL;
parse_type_int64(v, name, &i, &err);
if (err) {
error_propagate(errp, err);
} else {
*obj = i;
}
}
static void parse_type_size(Visitor *v, const char *name, uint64_t *obj,
Error **errp)
{
StringInputVisitor *siv = to_siv(v);
Error *err = NULL;
uint64_t val;
parse_option_size(name, siv->string, &val, &err);
if (err) {
error_propagate(errp, err);
return;
}
*obj = val;
}
static void parse_type_bool(Visitor *v, const char *name, bool *obj,
Error **errp)
{
StringInputVisitor *siv = to_siv(v);
if (!strcasecmp(siv->string, "on") ||
!strcasecmp(siv->string, "yes") ||
!strcasecmp(siv->string, "true")) {
*obj = true;
return;
}
if (!strcasecmp(siv->string, "off") ||
!strcasecmp(siv->string, "no") ||
!strcasecmp(siv->string, "false")) {
*obj = false;
return;
}
error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
"boolean");
}
static void parse_type_str(Visitor *v, const char *name, char **obj,
Error **errp)
{
StringInputVisitor *siv = to_siv(v);
*obj = g_strdup(siv->string);
}
static void parse_type_number(Visitor *v, const char *name, double *obj,
Error **errp)
{
StringInputVisitor *siv = to_siv(v);
char *endp = (char *) siv->string;
double val;
errno = 0;
val = strtod(siv->string, &endp);
if (errno || endp == siv->string || *endp) {
error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
"number");
return;
}
*obj = val;
}
static void parse_type_null(Visitor *v, const char *name, QNull **obj,
Error **errp)
{
StringInputVisitor *siv = to_siv(v);
*obj = NULL;
if (!siv->string || siv->string[0]) {
error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
"null");
return;
}
*obj = qnull();
}
static void string_input_free(Visitor *v)
{
StringInputVisitor *siv = to_siv(v);
g_list_foreach(siv->ranges, free_range, NULL);
g_list_free(siv->ranges);
g_free(siv);
}
Visitor *string_input_visitor_new(const char *str)
{
StringInputVisitor *v;
assert(str);
v = g_malloc0(sizeof(*v));
v->visitor.type = VISITOR_INPUT;
v->visitor.type_int64 = parse_type_int64;
v->visitor.type_uint64 = parse_type_uint64;
v->visitor.type_size = parse_type_size;
v->visitor.type_bool = parse_type_bool;
v->visitor.type_str = parse_type_str;
v->visitor.type_number = parse_type_number;
v->visitor.type_null = parse_type_null;
v->visitor.start_list = start_list;
v->visitor.next_list = next_list;
v->visitor.check_list = check_list;
v->visitor.end_list = end_list;
v->visitor.free = string_input_free;
v->string = str;
return &v->visitor;
}