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/**
* mds — A micro-display server
* Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "callables.h"
#include <stdlib.h>
#include <string.h>
/**
* Map, by index, from argument count, to list of callable's names
*/
static char*** restrict names = NULL;
/**
* If `callable_list[callabes[i][j]]` and `callable_include_stack_list[callabes[i][j]]`
* describe the callable named by `named[i][j]` with either `i` parameters, or the
* number of parameters specified by the suffix in `named[i][j]`
*/
static size_t** restrict callables = NULL;
/**
* Map the the number of elements in the, by index, corresponding element in `names`
*/
static size_t* restrict bucket_sizes = NULL;
/**
* List of callables
*/
static mds_kbdc_tree_t** restrict callable_list = NULL;
/**
* List of callables' include-stacks
*/
static mds_kbdc_include_stack_t** restrict callable_include_stack_list = NULL;
/**
* The number of buckets in `names` and `bucket_sizes`
*/
static size_t buckets = 0;
/**
* The index of the next item in `callable_list` and `callable_include_stack_list`
*/
static size_t list_ptr = 0;
/**
* Destroy the callable storage
*/
void callables_terminate(void)
{
size_t i, j, n;
char** bucket;
for (i = 0; i < list_ptr; i++)
{
bucket = names[i];
for (j = 0, n = bucket_sizes[i]; j < n; j++)
free(bucket[j]);
free(bucket);
}
for (i = 0; i < list_ptr; i++)
mds_kbdc_include_stack_free(callable_include_stack_list[i]);
free(names), names = NULL;
free(bucket_sizes), bucket_sizes = NULL;
free(callable_list), callable_list = NULL;
free(callable_include_stack_list), callable_include_stack_list = NULL;
buckets = list_ptr = 0;
}
/**
* Store a callable
*
* @param name The name of the callable
* @param arg_count The number of arguments the callable takes
* if `name` is suffixless, otherwise zero
* @param callable The callable
* @param callable_include_stack The include-stack for the callable
* @return Zero on success, -1 on error
*/
int callables_set(const char* restrict name, size_t arg_count, mds_kbdc_tree_t* restrict callable,
mds_kbdc_include_stack_t* restrict callable_include_stack)
{
#define yrealloc(var, elements, type) \
(new_##var = realloc(var, (elements) * sizeof(type)), \
(new_##var == NULL) ? -1 : (var = new_##var, new_##var = NULL, 0))
char* dupname = NULL;
char*** new_names = NULL;
size_t** new_callables = NULL;
size_t* new_bucket_sizes = NULL;
char** old_names = NULL;
size_t* old_callables = NULL;
mds_kbdc_tree_t** new_callable_list = NULL;
mds_kbdc_include_stack_t** new_callable_include_stack_list = NULL;
int saved_errno;
fail_if (dupname = strdup(name), dupname == NULL);
if (arg_count >= buckets)
{
fail_if (yrealloc(names, arg_count + 1, char**));
fail_if (yrealloc(callables, arg_count + 1, size_t*));
fail_if (yrealloc(bucket_sizes, arg_count + 1, size_t));
memset(names, 0, (arg_count + 1 - buckets) * sizeof(char**));
memset(callables, 0, (arg_count + 1 - buckets) * sizeof(size_t*));
memset(bucket_sizes, 0, (arg_count + 1 - buckets) * sizeof(size_t));
buckets = arg_count + 1;
}
fail_if (xxrealloc(old_names, names[arg_count], bucket_sizes[arg_count] + 1, char*));
fail_if (xxrealloc(old_callables, callables[arg_count], bucket_sizes[arg_count] + 1, size_t));
names[arg_count][bucket_sizes[arg_count]] = dupname, dupname = NULL;;
callables[arg_count][bucket_sizes[arg_count]] = list_ptr;
bucket_sizes[arg_count]++;
fail_if (yrealloc(callable_list, list_ptr + 1, mds_kbdc_tree_t*));
fail_if (yrealloc(callable_include_stack_list, list_ptr + 1, mds_kbdc_include_stack_t*));
callable_list[list_ptr] = callable;
callable_include_stack_list[list_ptr] = callable_include_stack;
list_ptr++;
return 0;
pfail:
saved_errno = errno;
free(dupname);
free(new_names);
free(new_callables);
free(new_bucket_sizes);
free(new_callable_list);
free(new_callable_include_stack_list);
if (old_names)
names[arg_count] = old_names;
if (old_callables)
callables[arg_count] = old_callables;
return errno = saved_errno, -1;
#undef yrealloc
}
/**
* Get a stored callable
*
* @param name The name of the callable
* @param arg_count The number of arguments the callable takes
* if `name` is suffixless, otherwise zero
* @param callable Output parameter for the callable, `NULL` if not found
* @param callable_include_stack Output parameter for the include-stack for the callable
*/
void callables_get(const char* restrict name, size_t arg_count, mds_kbdc_tree_t** restrict callable,
mds_kbdc_include_stack_t** restrict callable_include_stack)
{
char** restrict names_;
size_t i, n;
*callable = NULL;
*callable_include_stack = NULL;
if (arg_count >= buckets)
return;
names_ = names[arg_count];
for (i = 0, n = bucket_sizes[arg_count]; i < n; i++)
{
if (strcmp(names_[i], name))
continue;
i = callables[arg_count][i];
*callable = callable_list[i];
*callable_include_stack = callable_include_stack_list[i];
return;
}
}
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