161 lines
4.1 KiB
C
161 lines
4.1 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2013 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <util.h>
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#include "bus-signature.h"
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#include "bus-type.h"
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static int signature_element_length_internal(
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const char *s,
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bool allow_dict_entry,
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unsigned array_depth,
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unsigned struct_depth,
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size_t *l) {
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int r;
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if (!s)
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return -EINVAL;
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assert(l);
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if (bus_type_is_basic(*s) || *s == SD_BUS_TYPE_VARIANT) {
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*l = 1;
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return 0;
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}
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if (*s == SD_BUS_TYPE_ARRAY) {
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size_t t;
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if (array_depth >= 32)
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return -EINVAL;
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r = signature_element_length_internal(s + 1, true, array_depth+1, struct_depth, &t);
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if (r < 0)
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return r;
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*l = t + 1;
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return 0;
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}
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if (*s == SD_BUS_TYPE_STRUCT_BEGIN) {
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const char *p = s + 1;
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if (struct_depth >= 32)
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return -EINVAL;
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while (*p != SD_BUS_TYPE_STRUCT_END) {
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size_t t;
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r = signature_element_length_internal(p, false, array_depth, struct_depth+1, &t);
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if (r < 0)
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return r;
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p += t;
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}
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*l = p - s + 1;
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return 0;
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}
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if (*s == SD_BUS_TYPE_DICT_ENTRY_BEGIN && allow_dict_entry) {
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const char *p = s + 1;
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unsigned n = 0;
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if (struct_depth >= 32)
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return -EINVAL;
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while (*p != SD_BUS_TYPE_DICT_ENTRY_END) {
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size_t t;
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if (n == 0 && !bus_type_is_basic(*p))
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return -EINVAL;
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r = signature_element_length_internal(p, false, array_depth, struct_depth+1, &t);
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if (r < 0)
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return r;
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p += t;
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n++;
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}
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if (n != 2)
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return -EINVAL;
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*l = p - s + 1;
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return 0;
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}
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return -EINVAL;
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}
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int signature_element_length(const char *s, size_t *l) {
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return signature_element_length_internal(s, true, 0, 0, l);
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}
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bool signature_is_single(const char *s, bool allow_dict_entry) {
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int r;
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size_t t;
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if (!s)
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return false;
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r = signature_element_length_internal(s, allow_dict_entry, 0, 0, &t);
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if (r < 0)
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return false;
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return s[t] == 0;
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}
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bool signature_is_pair(const char *s) {
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if (!s)
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return false;
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if (!bus_type_is_basic(*s))
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return false;
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return signature_is_single(s + 1, false);
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}
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bool signature_is_valid(const char *s, bool allow_dict_entry) {
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const char *p;
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int r;
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if (!s)
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return false;
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p = s;
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while (*p) {
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size_t t;
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r = signature_element_length_internal(p, allow_dict_entry, 0, 0, &t);
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if (r < 0)
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return false;
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p += t;
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}
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return p - s <= 255;
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}
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