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/* misc_tools.h
*
* Miscellaneous functions and data structures for doing random things.
*
* Copyright (C) 2013 Tox project All Rights Reserved.
*
* This file is part of Tox.
*
* Tox 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.
*
* Tox 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 Tox. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef MISC_TOOLS_H
#define MISC_TOOLS_H
#include <stdlib.h>
#include <stdint.h>
#include <string.h> /* for memcpy() */
unsigned char *hex_string_to_bin(char hex_string[]);
/*********************Debugging Macros********************
* wiki.tox.im/index.php/Internal_functions_and_data_structures#Debugging
*********************************************************/
#ifdef DEBUG
#include <assert.h>
#include <stdio.h>
#include <string.h>
#define DEBUG_PRINT(str, ...) do { \
char msg[1000]; \
sprintf(msg, "%s(): line %d (file %s): %s%%c\n", __FUNCTION__, __LINE__, __FILE__, str); \
fprintf(stderr, msg, __VA_ARGS__); \
} while (0)
#define WARNING(...) do { \
fprintf(stderr, "warning in "); \
DEBUG_PRINT(__VA_ARGS__, ' '); \
} while (0)
#define INFO(...) do { \
DEBUG_PRINT(__VA_ARGS__, ' '); \
} while (0)
#undef ERROR
#define ERROR(exit_status, ...) do { \
fprintf(stderr, "error in "); \
DEBUG_PRINT(__VA_ARGS__, ' '); \
exit(exit_status); \
} while (0)
#else
#define WARNING(...)
#define INFO(...)
#undef ERROR
#define ERROR(...)
#endif // DEBUG
/************************Linked List***********************
* http://wiki.tox.im/index.php/Internal_functions_and_data_structures#Linked_List
* TODO: Update wiki.
**********************************************************/
#define MEMBER_OFFSET(var_name_in_parent, parent_type) \
(&(((parent_type*)0)->var_name_in_parent))
#define GET_PARENT(var, var_name_in_parent, parent_type) \
((parent_type*)((uint64_t)(&(var)) - (uint64_t)(MEMBER_OFFSET(var_name_in_parent, parent_type))))
#define TOX_LIST_FOR_EACH(lst, tmp_name) \
for (tox_list* tmp_name = lst.next; tmp_name != &lst; tmp_name = tmp_name->next)
#define TOX_LIST_GET_VALUE(tmp_name, name_in_parent, parent_type) GET_PARENT(tmp_name, name_in_parent, parent_type)
typedef struct tox_list {
struct tox_list *prev, *next;
} tox_list;
/* Returns a new tox_list_t. */
static inline void tox_list_new(tox_list *lst)
{
lst->prev = lst->next = lst;
}
/* Inserts a new tox_lst after lst and returns it. */
static inline void tox_list_add(tox_list *lst, tox_list *new_lst)
{
tox_list_new(new_lst);
new_lst->next = lst->next;
new_lst->next->prev = new_lst;
lst->next = new_lst;
new_lst->prev = lst;
}
static inline void tox_list_remove(tox_list *lst)
{
lst->prev->next = lst->next;
lst->next->prev = lst->prev;
}
/****************************Array***************************
* Array which manages its own memory allocation.
* It stores copy of data (not pointers).
* TODO: Add wiki info usage.
************************************************************/
typedef struct tox_array {
void *data; /* last elem is data[len-1] */
uint32_t len;
size_t elem_size; /* in bytes */
} tox_array;
static inline void tox_array_init(tox_array *arr, size_t elem_size)
{
arr->len = 0;
arr->elem_size = elem_size;
arr->data = NULL;
}
static inline void tox_array_delete(tox_array *arr)
{
free(arr->data);
arr->len = arr->elem_size = 0;
}
static inline uint8_t tox_array_push_ptr(tox_array *arr, uint8_t *item)
{
arr->data = realloc(arr->data, arr->elem_size * (arr->len+1));
if (arr->data == NULL)
return 0;
if (item != NULL)
memcpy(arr->data + arr->elem_size*arr->len, item, arr->elem_size);
arr->len++;
return 1;
}
#define tox_array_push(arr, item) tox_array_push_ptr(arr, (uint8_t*)(&(item)))
/* Deletes num items from array.
* Not same as pop in stacks, because to access elements you use data.
*/
static inline void tox_array_pop(tox_array *arr, uint32_t num)
{
if (num == 0)
num = 1;
arr->len -= num;
arr->data = realloc(arr->data, arr->elem_size*arr->len);
}
/* TODO: do not use type, since we track the needed info in
* elem_size (but array user will have to cast)
*/
#define tox_array_get(arr, i, type) (((type*)(arr)->data)[i])
/* This version requires C99 (declaring variables inside for loop)
#define tox_array_for_each(arr, type, tmp_name) \
for ( \
struct { type val; uint32_t i; } tmp_name = { tox_array_get(arr, 0, type), 0 }; \
tmp_name.i != (arr)->len; \
tmp_name.val = tox_array_get(arr, ++tmp_name.i, type) \
)
*/
#define tox_array_for_each(arr, type, tmp_name) \
type tmp_name; uint32_t tmp_name ## _i = 0; \
for (; tmp_name ## _i != (arr)->len; tmp_name = tox_array_get(arr, ++ tmp_name ## _i, type))
#endif // MISC_TOOLS_H
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