wsfalloc.c

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/*
 *
 * wsfalloc.c
 *
 * Author: Markku Rossi <mtr@iki.fi>
 *
 * Copyright (c) 1999-2000 WAPIT OY LTD.
 *       All rights reserved.
 *
 * Fast memory allocation routines.
 *
 */

#include "wsint.h"

/********************* Global functions *********************************/

WsFastMalloc *ws_f_create(size_t block_size)
{
    WsFastMalloc *pool = ws_calloc(1, sizeof(WsFastMalloc));

    if (pool == NULL)
        return NULL;

    pool->block_size = block_size;

    return pool;
}


void ws_f_destroy(WsFastMalloc *pool)
{
    WsFastMallocBlock *b, *bnext;

    if (pool == NULL)
        return;

    for (b = pool->blocks; b; b = bnext) {
        bnext = b->next;
        ws_free(b);
    }
    ws_free(pool);
}


void *ws_f_malloc(WsFastMalloc *pool, size_t size)
{
    unsigned char *result;

    /* Keep the blocks aligned, because this function is used to allocate
     * space for structures containing longs and such. */

    if (size % sizeof(long) != 0) {
        size += sizeof(long) - (size % sizeof(long));
    }

    if (pool->size < size) {
        size_t alloc_size;
        WsFastMallocBlock *b;

        /* Must allocate a fresh block. */
        alloc_size = pool->block_size;
        if (alloc_size < size)
            alloc_size = size;

        /* Allocate the block and remember to add the header size. */
        b = ws_malloc(alloc_size + sizeof(WsFastMallocBlock));

        if (b == NULL)
            /* No memory available. */
            return NULL;

        /* Add this block to the memory pool. */
        b->next = pool->blocks;
        pool->blocks = b;

        pool->ptr = ((unsigned char *) b) + sizeof(WsFastMallocBlock);
        pool->size = alloc_size;
    }

    /* Now we can allocate `size' bytes of data from this pool. */

    result = pool->ptr;

    pool->ptr += size;
    pool->size -= size;

    pool->user_bytes_allocated += size;

    return result;
}


void *ws_f_calloc(WsFastMalloc *pool, size_t num, size_t size)
{
    void *p = ws_f_malloc(pool, num * size);

    if (p == NULL)
        return p;

    memset(p, 0, num * size);

    return p;
}


void *ws_f_memdup(WsFastMalloc *pool, const void *ptr, size_t size)
{
    unsigned char *d = ws_f_malloc(pool, size + 1);

    if (d == NULL)
        return NULL;

    memcpy(d, ptr, size);
    d[size] = '\0';

    return d;
}


void *ws_f_strdup(WsFastMalloc *pool, const char *str)
{
    size_t len;
    char *s;

    if (str == NULL)
        return NULL;

    len = strlen(str) + 1;
    s = ws_f_malloc(pool, len);

    if (s == NULL)
        return NULL;

    memcpy(s, str, len);

    return s;
}

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