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lab5_ivec/vector.c
2025-12-06 02:45:59 -05:00

145 lines
2.2 KiB
C

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "vector.h"
#include "util.h"
#define VECTOR_START_SIZE 8
#define VECTOR_GROW_FACTOR 2
#define ITEMSZ sizeof(int)
void
vector_init(ivector *v)
{
assert(v);
v->n = 0;
v->maxsz = VECTOR_START_SIZE;
v->data = xmalloc(ITEMSZ * VECTOR_START_SIZE);
}
void
vector_initdata(ivector *v, int *arr, size_t arrsz)
{
assert(v && arrsz);
v->n = arrsz;
v->maxsz = (arrsz > VECTOR_START_SIZE) ? arrsz : VECTOR_START_SIZE;
v->data = xmalloc(ITEMSZ * v->maxsz);
memcpy(v->data, arr, arrsz * ITEMSZ);
}
void
vector_free(ivector *v)
{
assert(v);
v->n = 0;
v->maxsz = 0;
xfree(v->data);
v->data = NULL;
}
size_t
vector_len(const ivector *v)
{
assert(v);
return v->n;
}
int *
vector_data(const ivector *v)
{
assert(v);
return v->data;
}
void
vector_resize(ivector *v, int n)
{
assert(v);
if (n <= v->maxsz) {
if (n > v->n) {
memset(v->data + v->n, 0, (n - v->n) * ITEMSZ);
}
v->n = n;
} else {
size_t new_max = v->maxsz;
while (new_max < n) {
new_max *= VECTOR_GROW_FACTOR;
}
v->data = xrealloc(v->data, new_max * ITEMSZ);
if (n > v->n) {
memset(v->data + v->n, 0, (n - v->n) * ITEMSZ);
}
v->n = n;
v->maxsz = new_max;
}
}
void
vector_set(ivector *v, size_t idx, int val)
{
assert(v && idx < v->n);
v->data[idx] = val;
}
int
vector_get(const ivector *v, size_t idx)
{
assert(v && idx < v->n);
return v->data[idx];
}
void
vector_push(ivector *v, int val)
{
assert(v);
if (v->n == v->maxsz) {
vector_resize(v, v->n + 1);
v->data[v->n - 1] = val;
} else {
v->data[v->n++] = val;
}
}
void
vector_pop(ivector *v)
{
assert(v);
if (v->n > 0){
v->n--;
}
}
void
vector_insert(ivector *v, size_t idx, int val)
{
assert(v && v->n >= idx);
if (v->n == v->maxsz) {
size_t new_max = v->maxsz * VECTOR_GROW_FACTOR;
v->data = xrealloc(v->data, new_max * ITEMSZ);
v->maxsz = new_max;
}
memmove(v->data + idx + 1, v->data + idx, (v->n - idx) * ITEMSZ);
v->data[idx] = val;
v->n++;
}
void
vector_del(ivector *v, size_t idx)
{
assert(v && idx < v->n);
memmove(v->data + idx, v->data + idx + 1, (v->n - idx - 1) * ITEMSZ);
v->n--;
}
void
vector_clear(ivector *v)
{
vector_resize(v, 0);
}