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// ufn_arena.h: An arena allocator with maximum usage limiter.
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// Under MIT-License. Copyright by Eric-Paul Ickhorn (epickh).
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// UFN Arena library. MIT-Licensed (c) Eric-Paul Ickhorn (epickh)
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#ifndef UFN_ARENA_H
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#define UFN_ARENA_H
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typedef struct ufn_arena ufn_arena_s;
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/// @brief Arena structure which is being acted upon by the arena
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/// functions. Manual modification may lead to undesired behaviour.
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struct ufn_arena
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{
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uint32_t capacity;
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@ -22,50 +19,17 @@ struct ufn_arena
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ufn_arena_s *continuation;
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};
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/// @brief Allocates a new arena tree with up to 'max_tree_size' .
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/// @warning No later but possibly earlier than when a total of
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/// 'max_tree_size' was distributed, the allocation function
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/// (ufn_arena_alloc) will return NULL.
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/// @param capacity Number of bytes to allocate in the first arena;
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/// Determines how many bytes can be distributed.
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/// @param max_tree_size Maximum number of bytes to allocate for the
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/// continuations. If this is less than or equal to
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/// 'capacity' * 2, the next continuation will be
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/// the last one.
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/// @return Newly created dynamic arena.
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ufn_arena_s * ufn_new_dynamic_arena(uint32_t capacity, uint32_t max_tree_size);
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/// @brief Allocates a new arena with an immutable capacity.
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/// @warning If this arena's allocation is full,
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/// 'ufn_arena_alloc' will return NULL!
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/// @note Internally calls 'ufn_new_dynamic_arena' with a maximum tree size of 0.
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/// @param capacity Number of bytes to allocate in the arena;
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/// Determines how many bytes can be distributed.
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/// @return Newly created arena.
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ufn_arena_s * ufn_new_static_arena(uint32_t capacity);
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/// @brief Frees an arena and all its dynamic continuations.
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/// @param arena Arena to free.
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void ufn_free_arena(ufn_arena_s *arena);
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/// @brief Allocates a block of size 'size' in the arena 'arena'
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/// @warning Will return NULL if no memory block of length 'size'
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/// is available in the arena or any of the continuations.
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/// @param arena Arena to use for allocating 'size' bytes.
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/// @param size Number of bytes to allocate.
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/// @return Pointer to the newly allocated block.
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void * ufn_arena_alloc(ufn_arena_s *arena, uint32_t size);
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/// @brief Clones a string into the arena.
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/// @param arena Arena to clone string into.
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/// @param string String to clone.
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/// @return Copied string. The size is immutable.
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char * ufn_arena_clone_string(ufn_arena_s *arena, const char *string);
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// END OF API, START OF IMPLEMENTATION.
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#ifdef UFN_IMPLEMENTATION
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#include <stdlib.h>
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#include <string.h>
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ufn_arena_s * ufn_new_dynamic_arena(uint32_t capacity, uint32_t max_tree_size)
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{
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@ -127,18 +91,6 @@ void * ufn_arena_alloc(ufn_arena_s *arena, uint32_t size)
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return block;
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}
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char * ufn_arena_clone_string(ufn_arena_s *arena, const char *string)
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{
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uint32_t len_string = strlen(string);
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char *string_copy = ufn_arena_alloc(arena, len_string + 1);
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if(string_copy == NULL)
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{
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return NULL;
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}
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memcpy(string_copy, string, len_string + 1);
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return string_copy;
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}
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#endif // UFN_IMPLEMENTATION
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#endif // UFN_ARENA_H
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