db/dbmi_base/token.c

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#include <grass/dbmi.h>

/* these routines manage a mapping between tokens (ints) and memory addresses */
#define NONE ( (dbAddress) NULL )

static dbAddress *list = NONE;
static dbToken count = 0;

dbAddress db_find_token(dbToken token)
{
    if (token >= 0 && token < count)
        return list[token];
    return (NONE);
}

void db_drop_token(dbToken token)
{
    if (token >= 0 && token < count)
        list[token] = NONE;
}

dbToken db_new_token(dbAddress address)
{
    dbToken token;
    dbAddress *p;

    for (token = 0; token < count; token++)
        if (list[token] == NONE) {
            list[token] = address;
            return token;
        }

    p = (dbAddress *) db_realloc((void *)list, sizeof(*list) * (count + 1));
    if (p == NULL)
        return -1;

    list = p;
    token = count++;
    list[token] = address;
    return (token);
}