LXR linux/lib/cmdline

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Test cases for API provided by cmdline.c
   4 */
   5
   6#include <kunit/test.h>
   7#include <linux/kernel.h>
   8#include <linux/random.h>
   9#include <linux/string.h>
  10
  11static const char *cmdline_test_strings[] = {
  12        "\"\"", ""  , "=" , "\"-", ","    , "-,"   , ",-"   , "-" ,
  13        "+,"  , "--", ",,", "''" , "\"\",", "\",\"", "-\"\"", "\"",
  14};
  15
  16static const int cmdline_test_values[] = {
  17        1, 1, 1, 1, 2, 3, 2, 3,
  18        1, 3, 2, 1, 1, 1, 3, 1,
  19};
  20
  21static_assert(ARRAY_SIZE(cmdline_test_strings) == ARRAY_SIZE(cmdline_test_values));
  22
  23static const char *cmdline_test_range_strings[] = {
  24        "-7" , "--7"  , "-1-2"    , "7--9",
  25        "7-" , "-7--9", "7-9,"    , "9-7" ,
  26        "5-a", "a-5"  , "5-8"     , ",8-5",
  27        "+,1", "-,4"  , "-3,0-1,6", "4,-" ,
  28        " +2", " -9"  , "0-1,-3,6", "- 9" ,
  29};
  30
  31static const int cmdline_test_range_values[][16] = {
  32        { 1, -7, }, { 0, -0, }, { 4, -1, 0, +1, 2, }, { 0, 7, },
  33        { 0, +7, }, { 0, -7, }, { 3, +7, 8, +9, 0, }, { 0, 9, },
  34        { 0, +5, }, { 0, -0, }, { 4, +5, 6, +7, 8, }, { 0, 0, },
  35        { 0, +0, }, { 0, -0, }, { 4, -3, 0, +1, 6, }, { 1, 4, },
  36        { 0, +0, }, { 0, -0, }, { 4, +0, 1, -3, 6, }, { 0, 0, },
  37};
  38
  39static_assert(ARRAY_SIZE(cmdline_test_range_strings) == ARRAY_SIZE(cmdline_test_range_values));
  40
  41static void cmdline_do_one_test(struct kunit *test, const char *in, int rc, int offset)
  42{
  43        const char *fmt = "Pattern: %s";
  44        const char *out = in;
  45        int dummy;
  46        int ret;
  47
  48        ret = get_option((char **)&out, &dummy);
  49
  50        KUNIT_EXPECT_EQ_MSG(test, ret, rc, fmt, in);
  51        KUNIT_EXPECT_PTR_EQ_MSG(test, out, in + offset, fmt, in);
  52}
  53
  54static void cmdline_test_noint(struct kunit *test)
  55{
  56        unsigned int i = 0;
  57
  58        do {
  59                const char *str = cmdline_test_strings[i];
  60                int rc = 0;
  61                int offset;
  62
  63                /* Only first and leading '-' will advance the pointer */
  64                offset = !!(*str == '-');
  65                cmdline_do_one_test(test, str, rc, offset);
  66        } while (++i < ARRAY_SIZE(cmdline_test_strings));
  67}
  68
  69static void cmdline_test_lead_int(struct kunit *test)
  70{
  71        unsigned int i = 0;
  72        char in[32];
  73
  74        do {
  75                const char *str = cmdline_test_strings[i];
  76                int rc = cmdline_test_values[i];
  77                int offset;
  78
  79                sprintf(in, "%u%s", get_random_int() % 256, str);
  80                /* Only first '-' after the number will advance the pointer */
  81                offset = strlen(in) - strlen(str) + !!(rc == 2);
  82                cmdline_do_one_test(test, in, rc, offset);
  83        } while (++i < ARRAY_SIZE(cmdline_test_strings));
  84}
  85
  86static void cmdline_test_tail_int(struct kunit *test)
  87{
  88        unsigned int i = 0;
  89        char in[32];
  90
  91        do {
  92                const char *str = cmdline_test_strings[i];
  93                /* When "" or "-" the result will be valid integer */
  94                int rc = strcmp(str, "") ? (strcmp(str, "-") ? 0 : 1) : 1;
  95                int offset;
  96
  97                sprintf(in, "%s%u", str, get_random_int() % 256);
  98                /*
  99                 * Only first and leading '-' not followed by integer
 100                 * will advance the pointer.
 101                 */
 102                offset = rc ? strlen(in) : !!(*str == '-');
 103                cmdline_do_one_test(test, in, rc, offset);
 104        } while (++i < ARRAY_SIZE(cmdline_test_strings));
 105}
 106
 107static void cmdline_do_one_range_test(struct kunit *test, const char *in,
 108                                      unsigned int n, const int *e)
 109{
 110        unsigned int i;
 111        int r[16];
 112        int *p;
 113
 114        memset(r, 0, sizeof(r));
 115        get_options(in, ARRAY_SIZE(r), r);
 116        KUNIT_EXPECT_EQ_MSG(test, r[0], e[0], "in test %u (parsed) expected %d numbers, got %d",
 117                            n, e[0], r[0]);
 118        for (i = 1; i < ARRAY_SIZE(r); i++)
 119                KUNIT_EXPECT_EQ_MSG(test, r[i], e[i], "in test %u at %u", n, i);
 120
 121        memset(r, 0, sizeof(r));
 122        get_options(in, 0, r);
 123        KUNIT_EXPECT_EQ_MSG(test, r[0], e[0], "in test %u (validated) expected %d numbers, got %d",
 124                            n, e[0], r[0]);
 125
 126        p = memchr_inv(&r[1], 0, sizeof(r) - sizeof(r[0]));
 127        KUNIT_EXPECT_PTR_EQ_MSG(test, p, NULL, "in test %u at %u out of bound", n, p - r);
 128}
 129
 130static void cmdline_test_range(struct kunit *test)
 131{
 132        unsigned int i = 0;
 133
 134        do {
 135                const char *str = cmdline_test_range_strings[i];
 136                const int *e = cmdline_test_range_values[i];
 137
 138                cmdline_do_one_range_test(test, str, i, e);
 139        } while (++i < ARRAY_SIZE(cmdline_test_range_strings));
 140}
 141
 142static struct kunit_case cmdline_test_cases[] = {
 143        KUNIT_CASE(cmdline_test_noint),
 144        KUNIT_CASE(cmdline_test_lead_int),
 145        KUNIT_CASE(cmdline_test_tail_int),
 146        KUNIT_CASE(cmdline_test_range),
 147        {}
 148};
 149
 150static struct kunit_suite cmdline_test_suite = {
 151        .name = "cmdline",
 152        .test_cases = cmdline_test_cases,
 153};
 154kunit_test_suite(cmdline_test_suite);
 155
 156MODULE_LICENSE("GPL");
 157