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/**
* Copyright (c) 2014 rxi
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MIT license. See LICENSE for details.
*/
#include "vec.h"
int vec_expand_(char **data, int *length, int *capacity, int memsz) {
if (*length + 1 > *capacity) {
void *ptr;
int n = (*capacity == 0) ? 1 : *capacity << 1;
ptr = realloc(*data, n * memsz);
if (ptr == NULL) return -1;
*data = ptr;
*capacity = n;
}
return 0;
}
int vec_reserve_(char **data, int *length, int *capacity, int memsz, int n) {
(void) length;
if (n > *capacity) {
void *ptr = realloc(*data, n * memsz);
if (ptr == NULL) return -1;
*data = ptr;
*capacity = n;
}
return 0;
}
int vec_reserve_po2_(
char **data, int *length, int *capacity, int memsz, int n
) {
int n2 = 1;
if (n == 0) return 0;
while (n2 < n) n2 <<= 1;
return vec_reserve_(data, length, capacity, memsz, n2);
}
int vec_compact_(char **data, int *length, int *capacity, int memsz) {
if (*length == 0) {
free(*data);
*data = NULL;
*capacity = 0;
return 0;
} else {
void *ptr;
int n = *length;
ptr = realloc(*data, n * memsz);
if (ptr == NULL) return -1;
*capacity = n;
*data = ptr;
}
return 0;
}
int vec_insert_(char **data, int *length, int *capacity, int memsz,
int idx
) {
int err = vec_expand_(data, length, capacity, memsz);
if (err) return err;
memmove(*data + (idx + 1) * memsz,
*data + idx * memsz,
(*length - idx) * memsz);
return 0;
}
void vec_splice_(char **data, int *length, int *capacity, int memsz,
int start, int count
) {
(void) capacity;
memmove(*data + start * memsz,
*data + (start + count) * memsz,
(*length - start - count) * memsz);
}
void vec_swapsplice_(char **data, int *length, int *capacity, int memsz,
int start, int count
) {
(void) capacity;
memmove(*data + start * memsz,
*data + (*length - count) * memsz,
count * memsz);
}
void vec_swap_(char **data, int *length, int *capacity, int memsz,
int idx1, int idx2
) {
unsigned char *a, *b, tmp;
int count;
(void) length;
(void) capacity;
if (idx1 == idx2) return;
a = (unsigned char*) *data + idx1 * memsz;
b = (unsigned char*) *data + idx2 * memsz;
count = memsz;
while (count--) {
tmp = *a;
*a = *b;
*b = tmp;
a++, b++;
}
}
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