cmd/pgrep/idtab.c

	idtab.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <libintl.h>
#include <string.h>
#include <stdlib.h>
#include <libuutil.h>

#include "idtab.h"

#define IDTAB_GROW  2   /* Table size multiplier on grow */
#define IDTAB_DEFSIZE   16  /* Starting table size */

void
idtab_create(idtab_t *idt)
{
    (void) memset(idt, 0, sizeof (idtab_t));
}

void
idtab_destroy(idtab_t *idt)
{
    if (idt->id_data) {
        free(idt->id_data);
        idt->id_data = NULL;
        idt->id_nelems = idt->id_size = 0;
    }
}

void
idtab_append(idtab_t *idt, idkey_t id)
{
    size_t size;
    void *data;

    if (idt->id_nelems >= idt->id_size) {
        size = idt->id_size ? idt->id_size * IDTAB_GROW : IDTAB_DEFSIZE;

        if (data = realloc(idt->id_data, sizeof (idkey_t) * size)) {
            idt->id_data = data;
            idt->id_size = size;
        } else {
            uu_die(gettext("Failed to grow table"));
        }
    }

    idt->id_data[idt->id_nelems++] = id;
}

static int
idtab_compare(const void *lhsp, const void *rhsp)
{
    idkey_t lhs = *((idkey_t *)lhsp);
    idkey_t rhs = *((idkey_t *)rhsp);

    if (lhs == rhs)
        return (0);

    return (lhs > rhs ? 1 : -1);
}

void
idtab_sort(idtab_t *idt)
{
    if (idt->id_data) {
        qsort(idt->id_data, idt->id_nelems,
            sizeof (idkey_t), idtab_compare);
    }
}

int
idtab_search(idtab_t *idt, idkey_t id)
{
    return (bsearch(&id, idt->id_data, idt->id_nelems,
        sizeof (idkey_t), idtab_compare) != NULL);
}