lsquic_arr.c revision c51ce338
150aadb33SDmitri Tikhonov/* Copyright (c) 2017 LiteSpeed Technologies Inc.  See LICENSE. */
250aadb33SDmitri Tikhonov/*
350aadb33SDmitri Tikhonov * lsquic_arr.c
450aadb33SDmitri Tikhonov */
550aadb33SDmitri Tikhonov
650aadb33SDmitri Tikhonov#include "lsquic_arr.h"
750aadb33SDmitri Tikhonov
850aadb33SDmitri Tikhonovint
950aadb33SDmitri Tikhonovlsquic_arr_push (struct lsquic_arr *arr, uintptr_t val)
1050aadb33SDmitri Tikhonov{
1150aadb33SDmitri Tikhonov    uintptr_t *new_els;
1250aadb33SDmitri Tikhonov    unsigned n;
1350aadb33SDmitri Tikhonov
1450aadb33SDmitri Tikhonov    if (arr->off + arr->nelem < arr->nalloc)
1550aadb33SDmitri Tikhonov    {
1650aadb33SDmitri Tikhonov        arr->els[arr->off + arr->nelem] = val;
1750aadb33SDmitri Tikhonov        ++arr->nelem;
1850aadb33SDmitri Tikhonov        return 0;
1950aadb33SDmitri Tikhonov    }
2050aadb33SDmitri Tikhonov
2150aadb33SDmitri Tikhonov    if (arr->off > arr->nalloc / 2)
2250aadb33SDmitri Tikhonov    {
2350aadb33SDmitri Tikhonov        memmove(arr->els, arr->els + arr->off,
2450aadb33SDmitri Tikhonov                                        sizeof(arr->els[0]) * arr->nelem);
2550aadb33SDmitri Tikhonov        arr->off = 0;
2650aadb33SDmitri Tikhonov        arr->els[arr->nelem] = val;
2750aadb33SDmitri Tikhonov        ++arr->nelem;
2850aadb33SDmitri Tikhonov        return 0;
2950aadb33SDmitri Tikhonov    }
3050aadb33SDmitri Tikhonov
3150aadb33SDmitri Tikhonov    if (arr->nalloc)
3250aadb33SDmitri Tikhonov        n = arr->nalloc * 2;
3350aadb33SDmitri Tikhonov    else
3450aadb33SDmitri Tikhonov        n = 64;
3550aadb33SDmitri Tikhonov    new_els = malloc(n * sizeof(arr->els[0]));
3650aadb33SDmitri Tikhonov    if (!new_els)
3750aadb33SDmitri Tikhonov        return -1;
3850aadb33SDmitri Tikhonov    memcpy(new_els, arr->els + arr->off, sizeof(arr->els[0]) * arr->nelem);
3950aadb33SDmitri Tikhonov    free(arr->els);
4050aadb33SDmitri Tikhonov    arr->off = 0;
4150aadb33SDmitri Tikhonov    arr->els = new_els;
4250aadb33SDmitri Tikhonov    arr->nalloc = n;
4350aadb33SDmitri Tikhonov    arr->els[arr->off + arr->nelem] = val;
4450aadb33SDmitri Tikhonov    ++arr->nelem;
4550aadb33SDmitri Tikhonov    return 0;
4650aadb33SDmitri Tikhonov}
47c51ce338SDmitri Tikhonov
48c51ce338SDmitri Tikhonov
49c51ce338SDmitri Tikhonovsize_t
50c51ce338SDmitri Tikhonovlsquic_arr_mem_used (const struct lsquic_arr *arr)
51c51ce338SDmitri Tikhonov{
52c51ce338SDmitri Tikhonov    return sizeof(*arr) + arr->nalloc * sizeof(arr->els[0]);
53c51ce338SDmitri Tikhonov}
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