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array.c
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array.c
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#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "array.h"
#include "util.h"
#define ARRAY_SIZE 16
void array_init(Array *arr) {
array_init_sized(arr, sizeof(void*));
}
void array_init_from(Array *arr, Array *from) {
array_init_sized(arr, from->elem_size);
}
void array_init_sized(Array *arr, size_t elem_size) {
memset(arr, 0, sizeof *arr);
arr->elem_size = elem_size;
}
bool array_reserve(Array *arr, size_t count) {
if (count < ARRAY_SIZE)
count = ARRAY_SIZE;
if (arr->count < count) {
count = MAX(count, arr->count*2);
char *items = realloc(arr->items, count * arr->elem_size);
if (!items)
return false;
arr->count = count;
arr->items = items;
}
return true;
}
void array_release(Array *arr) {
if (!arr)
return;
free(arr->items);
array_init_sized(arr, arr->elem_size);
}
void array_release_full(Array *arr) {
if (!arr)
return;
for (size_t i = 0; i < arr->len; i++)
free(array_get_ptr(arr, i));
array_release(arr);
}
void array_clear(Array *arr) {
arr->len = 0;
if (arr->items)
memset(arr->items, 0, arr->count * arr->elem_size);
}
void *array_get(Array *arr, size_t idx) {
if (idx >= arr->len) {
errno = EINVAL;
return NULL;
}
return arr->items + (idx * arr->elem_size);
}
void *array_get_ptr(Array *arr, size_t idx) {
if (arr->elem_size != sizeof(void*)) {
errno = ENOTSUP;
return NULL;
}
void **ptr = array_get(arr, idx);
return ptr ? *ptr : NULL;
}
bool array_set(Array *arr, size_t idx, void *item) {
if (idx >= arr->len) {
errno = EINVAL;
return false;
}
if (item)
memcpy(arr->items + (idx * arr->elem_size), item, arr->elem_size);
else
memset(arr->items + (idx * arr->elem_size), 0, arr->elem_size);
return true;
}
bool array_set_ptr(Array *arr, size_t idx, void *item) {
if (arr->elem_size != sizeof(void*)) {
errno = ENOTSUP;
return false;
}
return array_set(arr, idx, &item);
}
bool array_add(Array *arr, void *item) {
if (!array_reserve(arr, arr->len+1))
return false;
if (!array_set(arr, arr->len++, item)) {
arr->len--;
return false;
}
return true;
}
bool array_add_ptr(Array *arr, void *item) {
if (!array_reserve(arr, arr->len+1))
return false;
if (!array_set_ptr(arr, arr->len++, item)) {
arr->len--;
return false;
}
return true;
}
bool array_remove(Array *arr, size_t idx) {
if (idx >= arr->len) {
errno = EINVAL;
return false;
}
char *dest = arr->items + idx * arr->elem_size;
char *src = arr->items + (idx + 1) * arr->elem_size;
memmove(dest, src, (arr->len - idx - 1) * arr->elem_size);
arr->len--;
return true;
}
size_t array_length(Array *arr) {
return arr->len;
}
size_t array_capacity(Array *arr) {
return arr->count;
}
bool array_truncate(Array *arr, size_t len) {
if (len <= arr->len) {
arr->len = len;
return true;
}
return false;
}
bool array_resize(Array *arr, size_t len) {
if (len <= arr->count) {
arr->len = len;
return true;
}
return false;
}
void array_sort(Array *arr, int (*compar)(const void*, const void*)) {
qsort(arr->items, arr->len, arr->elem_size, compar);
}
bool array_push(Array *arr, void *item) {
return array_add(arr, item);
}
void *array_pop(Array *arr) {
void *item = array_peek(arr);
if (!item)
return NULL;
arr->len--;
return item;
}
void *array_peek(Array *arr) {
if (arr->len == 0)
return NULL;
return array_get(arr, arr->len - 1);
}