tests/sys/sys/bitset_test.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2021 The FreeBSD Foundation
   5  *
   6  * This software was developed by Mark Johnston under sponsorship from
   7  * the FreeBSD Foundation.
   8  */
   9
  10 #include <sys/types.h>
  11 #include <sys/_bitset.h>
  12 #include <sys/bitset.h>
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15
  16 #include <atf-c.h>
  17
  18 BITSET_DEFINE(bs256, 256);
  19
  20 ATF_TC_WITHOUT_HEAD(bit_foreach);
  21 ATF_TC_BODY(bit_foreach, tc)
  22 {
  23         struct bs256 bs0, bs1, bsrand;
  24         int setc, clrc, i;
  25
  26 #define _BIT_FOREACH_COUNT(s, bs) do {                                  \
  27         int prev = -1;                                                  \
  28         setc = clrc = 0;                                                \
  29         BIT_FOREACH_ISSET((s), i, (bs)) {                               \
  30                 ATF_REQUIRE_MSG(prev < i, "incorrect bit ordering");    \
  31                 ATF_REQUIRE_MSG(BIT_ISSET((s), i, (bs)),                \
  32                     "bit %d is not set", i);                            \
  33                 setc++;                                                 \
  34                 prev = i;                                               \
  35         }                                                               \
  36         prev = -1;                                                      \
  37         BIT_FOREACH_ISCLR((s), i, (bs)) {                               \
  38                 ATF_REQUIRE_MSG(prev < i, "incorrect bit ordering");    \
  39                 ATF_REQUIRE_MSG(!BIT_ISSET((s), i, (bs)),               \
  40                     "bit %d is set", i);                                \
  41                 clrc++;                                                 \
  42                 prev = i;                                               \
  43         }                                                               \
  44 } while (0)
  45
  46         /*
  47          * Create several bitsets, and for each one count the number
  48          * of set and clear bits and make sure they match what we expect.
  49          */
  50
  51         BIT_FILL(256, &bs1);
  52         _BIT_FOREACH_COUNT(256, &bs1);
  53         ATF_REQUIRE_MSG(setc == 256, "incorrect set count %d", setc);
  54         ATF_REQUIRE_MSG(clrc == 0, "incorrect clear count %d", clrc);
  55
  56         BIT_ZERO(256, &bs0);
  57         _BIT_FOREACH_COUNT(256, &bs0);
  58         ATF_REQUIRE_MSG(setc == 0, "incorrect set count %d", setc);
  59         ATF_REQUIRE_MSG(clrc == 256, "incorrect clear count %d", clrc);
  60
  61         BIT_ZERO(256, &bsrand);
  62         for (i = 0; i < 256; i++)
  63                 if (random() % 2 != 0)
  64                         BIT_SET(256, i, &bsrand);
  65         _BIT_FOREACH_COUNT(256, &bsrand);
  66         ATF_REQUIRE_MSG(setc + clrc == 256, "incorrect counts %d, %d",
  67             setc, clrc);
  68
  69         /*
  70          * Try to verify that we can safely clear bits in the set while
  71          * iterating.
  72          */
  73         BIT_FOREACH_ISSET(256, i, &bsrand) {
  74                 ATF_REQUIRE(setc-- > 0);
  75                 BIT_CLR(256, i, &bsrand);
  76         }
  77         _BIT_FOREACH_COUNT(256, &bsrand);
  78         ATF_REQUIRE_MSG(setc == 0, "incorrect set count %d", setc);
  79         ATF_REQUIRE_MSG(clrc == 256, "incorrect clear count %d", clrc);
  80
  81 #undef _BIT_FOREACH_COUNT
  82 }
  83
  84 ATF_TP_ADD_TCS(tp)
  85 {
  86         ATF_TP_ADD_TC(tp, bit_foreach);
  87         return (atf_no_error());
  88 }