usr/src/cmd/pgrep/idtab.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <libintl.h>
  30 #include <string.h>
  31 #include <stdlib.h>
  32 #include <libuutil.h>
  33
  34 #include "idtab.h"
  35
  36 #define IDTAB_GROW      2       /* Table size multiplier on grow */
  37 #define IDTAB_DEFSIZE   16      /* Starting table size */
  38
  39 void
  40 idtab_create(idtab_t *idt)
  41 {
  42         (void) memset(idt, 0, sizeof (idtab_t));
  43 }
  44
  45 void
  46 idtab_destroy(idtab_t *idt)
  47 {
  48         if (idt->id_data) {
  49                 free(idt->id_data);
  50                 idt->id_data = NULL;
  51                 idt->id_nelems = idt->id_size = 0;
  52         }
  53 }
  54
  55 void
  56 idtab_append(idtab_t *idt, idkey_t id)
  57 {
  58         size_t size;
  59         void *data;
  60
  61         if (idt->id_nelems >= idt->id_size) {
  62                 size = idt->id_size ? idt->id_size * IDTAB_GROW : IDTAB_DEFSIZE;
  63
  64                 if (data = realloc(idt->id_data, sizeof (idkey_t) * size)) {
  65                         idt->id_data = data;
  66                         idt->id_size = size;
  67                 } else {
  68                         uu_die(gettext("Failed to grow table"));
  69                 }
  70         }
  71
  72         idt->id_data[idt->id_nelems++] = id;
  73 }
  74
  75 static int
  76 idtab_compare(const void *lhsp, const void *rhsp)
  77 {
  78         idkey_t lhs = *((idkey_t *)lhsp);
  79         idkey_t rhs = *((idkey_t *)rhsp);
  80
  81         if (lhs == rhs)
  82                 return (0);
  83
  84         return (lhs > rhs ? 1 : -1);
  85 }
  86
  87 void
  88 idtab_sort(idtab_t *idt)
  89 {
  90         if (idt->id_data) {
  91                 qsort(idt->id_data, idt->id_nelems,
  92                     sizeof (idkey_t), idtab_compare);
  93         }
  94 }
  95
  96 int
  97 idtab_search(idtab_t *idt, idkey_t id)
  98 {
  99         return (bsearch(&id, idt->id_data, idt->id_nelems,
 100             sizeof (idkey_t), idtab_compare) != NULL);
 101 }