Sun, 20 Nov 2022 15:51:02 +0100
#219 array list: implement compare
/* * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. * * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include "cx/array_list.h" #include <assert.h> #include <string.h> #include <stdint.h> /* LOW LEVEL ARRAY LIST FUNCTIONS */ enum cx_array_copy_result cx_array_copy( void **target, size_t *size, size_t *capacity, size_t index, void const *src, size_t elem_size, size_t elem_count, struct cx_array_reallocator_s *reallocator ) { /* assert pointers */ assert(target != NULL); assert(size != NULL); assert(src != NULL); /* determine capacity */ size_t cap = capacity == NULL ? *size : *capacity; /* check if resize is required */ size_t newsize = index + elem_count; bool needrealloc = newsize > cap; /* reallocate if possible */ if (needrealloc) { /* a reallocator and a capacity variable must be available */ if (reallocator == NULL || capacity == NULL) { return CX_ARRAY_COPY_REALLOC_NOT_SUPPORTED; } /* check, if we need to repair the src pointer */ uintptr_t targetaddr = (uintptr_t) *target; uintptr_t srcaddr = (uintptr_t) src; bool repairsrc = targetaddr <= srcaddr && srcaddr < targetaddr + cap * elem_size; /* increase capacity linearly */ cap += 16; /* perform reallocation */ void *newmem = reallocator->realloc( *target, cap, elem_size, reallocator ); if (newmem == NULL) { return CX_ARRAY_COPY_REALLOC_FAILED; } /* repair src pointer, if necessary */ if (repairsrc) { src = ((char *) newmem) + (srcaddr - targetaddr); } /* store new pointer and capacity */ *target = newmem; *capacity = cap; } /* determine target pointer */ char *start = *target; start += index * elem_size; /* copy elements and set new size */ memmove(start, src, elem_count * elem_size); *size = newsize; /* return successfully */ return CX_ARRAY_COPY_SUCCESS; } /* HIGH LEVEL ARRAY LIST FUNCTIONS */ typedef struct { struct cx_list_s base; void *data; struct cx_array_reallocator_s reallocator; } cx_array_list; static void *cx_arl_realloc( void *array, size_t capacity, size_t elem_size, struct cx_array_reallocator_s *alloc ) { /* retrieve the pointer to the list allocator */ CxAllocator const *al = alloc->ptr1; /* use the list allocator to reallocate the memory */ return cxRealloc(al, array, capacity * elem_size); } static void cx_arl_destructor(struct cx_list_s *list) { cx_array_list *arl = (cx_array_list *) list; cxFree(list->allocator, arl->data); } static int cx_arl_add( struct cx_list_s *list, void const *elem ) { cx_array_list *arl = (cx_array_list *) list; return cx_array_copy( &arl->data, &list->size, &list->capacity, list->size, elem, list->itemsize, 1, &arl->reallocator ); } static int cx_arl_insert( struct cx_list_s *list, size_t index, void const *elem ) { if (index > list->size) { return 1; } else if (index == list->size) { return cx_arl_add(list, elem); } else { cx_array_list *arl = (cx_array_list *) list; /* move elements starting at index to the right */ if (cx_array_copy( &arl->data, &list->size, &list->capacity, index + 1, ((char *) arl->data) + index * list->itemsize, list->itemsize, list->size - index, &arl->reallocator )) { return 1; } /* place the element */ memcpy(((char *) arl->data) + index * list->itemsize, elem, list->itemsize); return 0; } } static int cx_arl_insert_iter( struct cx_iterator_s *iter, void const *elem, int prepend ) { return 1; } static int cx_arl_remove( struct cx_list_s *list, size_t index ) { /* out-of-bounds check */ if (index >= list->size) { return 1; } cx_array_list *arl = (cx_array_list *) list; /* just move the elements starting at index to the left */ int result = cx_array_copy( &arl->data, &list->size, &list->capacity, index, ((char *) arl->data) + (index + 1) * list->itemsize, list->itemsize, list->size - index, &arl->reallocator ); if (result == 0) { /* decrease the size */ list->size--; } return result; } static void *cx_arl_at( struct cx_list_s const *list, size_t index ) { if (index < list->size) { cx_array_list const *arl = (cx_array_list const *) list; char *space = arl->data; return space + index * list->itemsize; } else { return NULL; } } static size_t cx_arl_find( struct cx_list_s const *list, void const *elem ) { char *cur = ((cx_array_list const *) list)->data; for (size_t i = 0; i < list->size; i++) { if (0 == list->cmpfunc(elem, cur)) { return i; } cur += list->itemsize; } return list->size; } static void cx_arl_sort(struct cx_list_s *list) { qsort(((cx_array_list *) list)->data, list->size, list->itemsize, list->cmpfunc ); } static int cx_arl_compare( struct cx_list_s const *list, struct cx_list_s const *other ) { } static void cx_arl_reverse(struct cx_list_s *list) { } static bool cx_arl_iter_valid(struct cx_iterator_s const *iter) { struct cx_list_s const *list = iter->src_handle; return iter->index < list->size; } static void *cx_arl_iter_current(struct cx_iterator_s const *iter) { return iter->elem_handle; } static void cx_arl_iter_next(struct cx_iterator_s *iter) { if (iter->remove) { iter->remove = false; cx_arl_remove(iter->src_handle, iter->index); } else { iter->index++; iter->elem_handle = cx_arl_at(iter->src_handle, iter->index); } } static struct cx_iterator_s cx_arl_iterator( struct cx_list_s *list, size_t index ) { struct cx_iterator_s iter; iter.index = index; iter.src_handle = list; iter.elem_handle = cx_arl_at(list, index); iter.valid = cx_arl_iter_valid; iter.current = cx_arl_iter_current; iter.next = cx_arl_iter_next; iter.remove = false; return iter; } static cx_list_class cx_array_list_class = { cx_arl_destructor, cx_arl_add, cx_arl_insert, cx_arl_insert_iter, cx_arl_remove, cx_arl_at, cx_arl_find, cx_arl_sort, cx_arl_compare, cx_arl_reverse, cx_arl_iterator, }; CxList *cxArrayListCreate( CxAllocator const *allocator, CxListComparator comparator, size_t item_size, size_t initial_capacity ) { cx_array_list *list = cxCalloc(allocator, 1, sizeof(cx_array_list)); if (list == NULL) return NULL; list->data = cxCalloc(allocator, initial_capacity, item_size); if (list->data == NULL) { cxFree(allocator, list); return NULL; } list->base.cl = &cx_array_list_class; list->base.allocator = allocator; list->base.cmpfunc = comparator; list->base.itemsize = item_size; list->base.capacity = initial_capacity; /* configure the reallocator */ list->reallocator.realloc = cx_arl_realloc; list->reallocator.ptr1 = (void *) allocator; return (CxList *) list; }