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util/array: Add array_realloc for wl_array
array_realloc will grow the array for the target size like wl_insert_add, but will also shrink the array if the target size is sufficiently smaller than the current allocation.
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2 changed files with 34 additions and 0 deletions
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@ -27,4 +27,9 @@ bool set_remove(uint32_t values[], size_t *len, size_t cap, uint32_t target);
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*/
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void array_remove_at(struct wl_array *arr, size_t offset, size_t size);
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/**
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* Grow or shrink the array to fit the specifized size.
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*/
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bool array_realloc(struct wl_array *arr, size_t size);
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#endif
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29
util/array.c
29
util/array.c
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@ -55,3 +55,32 @@ void array_remove_at(struct wl_array *arr, size_t offset, size_t size) {
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memmove(&data[offset], &data[offset + size], arr->size - offset - size);
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arr->size -= size;
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}
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bool array_realloc(struct wl_array *arr, size_t size) {
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// If the size is less than 1/4th of the allocation size, we shrink it.
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// 1/4th is picked to provide hysteresis, without which an array with size
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// arr->alloc would constantly reallocate if an element is added and then
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// removed continously.
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size_t alloc;
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if (arr->alloc > 0 && size > arr->alloc / 4) {
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alloc = arr->alloc;
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} else {
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alloc = 16;
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}
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while (alloc < size) {
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alloc *= 2;
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}
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if (alloc == arr->alloc) {
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return true;
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}
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void *data = realloc(arr->data, alloc);
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if (data == NULL) {
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return false;
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}
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arr->data = data;
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arr->alloc = alloc;
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return true;
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}
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