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util/array: Add reverse helpers

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Alexander Orzechowski 2022-08-25 21:55:46 -04:00 • committed by Leo Li
parent 3c71f61c0b
commit 55bc5a0d99
2 changed files with 34 additions and 0 deletions
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23
util/array.c
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@ -38,3 +38,26 @@ bool array_realloc(struct wl_array *arr, size_t size) {
arr->alloc = alloc;
return true;
}
void *array_reversed_start(struct wl_array *arr) {
char *data = arr->data;
return data + arr->alloc - arr->size;
}
void *array_reversed_add(struct wl_array *arr, size_t size) {
if (arr->size + size > arr->alloc) {
size_t new_alloc = arr->alloc * 2;
char *new = malloc(new_alloc);
if (!new) {
return NULL;
}
memcpy(new + (new_alloc - arr->size), array_reversed_start(arr), arr->size);
free(arr->data);
arr->data = new;
arr->alloc = new_alloc;
}
arr->size += size;
return array_reversed_start(arr);
}