1 /* Test and measure memcmp functions.
2 Copyright (C) 1999-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
21 # define TEST_NAME "__memcmpeq"
23 # define TEST_NAME "wmemcmp"
25 # define TEST_NAME "memcmp"
28 #include "test-string.h"
30 # include <inttypes.h>
33 # define MEMCMP wmemcmp
34 # define MEMCPY wmemcpy
35 # define SIMPLE_MEMCMP simple_wmemcmp
37 # define UCHAR wchar_t
39 # define CHAR__MIN WCHAR_MIN
40 # define CHAR__MAX WCHAR_MAX
43 SIMPLE_MEMCMP (const wchar_t *s1, const wchar_t *s2, size_t n)
47 wmemcmp has to use SIGNED comparison for elements.
48 memcmp has to use UNSIGNED comparison for elemnts.
50 while (n-- && (ret = *s1 < *s2 ? -1 : *s1 == *s2 ? 0 : 1) == 0) {s1++; s2++;}
56 # define MEMCMP __memcmpeq
57 # define SIMPLE_MEMCMP simple_memcmpeq
59 # define MEMCMP memcmp
60 # define SIMPLE_MEMCMP simple_memcmp
62 # define MEMCPY memcpy
65 # define UCHAR unsigned char
67 # define CHAR__MIN CHAR_MIN
68 # define CHAR__MAX CHAR_MAX
71 SIMPLE_MEMCMP (const char *s1, const char *s2, size_t n)
75 while (n-- && (ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) == 0);
81 # define BAD_RESULT(result, expec) \
82 (((result) == 0 && (expec)) || ((result) < 0 && (expec) >= 0) || \
83 ((result) > 0 && (expec) <= 0))
86 typedef int (*proto_t) (const CHAR *, const CHAR *, size_t);
91 check_result (impl_t *impl, const CHAR *s1, const CHAR *s2, size_t len,
94 int result = CALL (impl, s1, s2, len);
95 if (BAD_RESULT(result, exp_result))
97 error (0, 0, "Wrong result in function %s %d %d", impl->name,
107 do_one_test (impl_t *impl, const CHAR *s1, const CHAR *s2, size_t len,
110 if (check_result (impl, s1, s2, len, exp_result) < 0)
115 do_test (size_t align1, size_t align2, size_t len, int exp_result)
120 align1 &= (4096 - CHARBYTES);
121 if (align1 + (len + 1) * CHARBYTES >= page_size)
124 align2 &= (4096 - CHARBYTES);
125 if (align2 + (len + 1) * CHARBYTES >= page_size)
128 s1 = (CHAR *) (buf1 + align1);
129 s2 = (CHAR *) (buf2 + align2);
131 for (i = 0; i < len; i++)
132 s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % CHAR__MAX;
138 s2[len - 1] -= exp_result;
145 FOR_EACH_IMPL (impl, 0)
146 do_one_test (impl, s1, s2, len, exp_result);
150 do_random_tests (void)
152 size_t i, j, n, align1, align2, pos, len;
155 UCHAR *p1 = (UCHAR *) (buf1 + page_size - 512 * CHARBYTES);
156 UCHAR *p2 = (UCHAR *) (buf2 + page_size - 512 * CHARBYTES);
158 for (n = 0; n < ITERATIONS; n++)
160 align1 = random () & 31;
162 align2 = random () & 31;
164 align2 = align1 + (random () & 24);
165 pos = random () & 511;
170 pos = 511 - j - (random () & 7);
171 len = random () & 511;
173 len = 511 - j - (random () & 7);
174 j = len + align1 + 64;
175 if (j > 512) j = 512;
176 for (i = 0; i < j; ++i)
177 p1[i] = random () & 255;
178 for (i = 0; i < j; ++i)
179 p2[i] = random () & 255;
183 MEMCPY ((CHAR *) p2 + align2, (const CHAR *) p1 + align1, len);
186 MEMCPY ((CHAR *) p2 + align2, (const CHAR *) p1 + align1, pos);
187 if (p2[align2 + pos] == p1[align1 + pos])
189 p2[align2 + pos] = random () & 255;
190 if (p2[align2 + pos] == p1[align1 + pos])
191 p2[align2 + pos] = p1[align1 + pos] + 3 + (random () & 127);
194 if (p1[align1 + pos] < p2[align2 + pos])
200 FOR_EACH_IMPL (impl, 1)
202 r = CALL (impl, (CHAR *) p1 + align1, (const CHAR *) p2 + align2,
204 if (BAD_RESULT(r, result))
206 error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd, %zd) %ld != %d, p1 %p p2 %p",
207 n, impl->name, align1 * CHARBYTES & 63, align2 * CHARBYTES & 63, len, pos, r, result, p1, p2);
217 CHAR s1[116], s2[116];
454 for (size_t i = 0; i < n; i++)
455 for (size_t len = 0; len <= n - i; ++len)
457 exp_result = SIMPLE_MEMCMP (s1 + i, s2 + i, len);
458 FOR_EACH_IMPL (impl, 0)
459 check_result (impl, s1 + i, s2 + i, len, exp_result);
463 /* This test checks that memcmp doesn't overrun buffers. */
467 size_t max_length = page_size / sizeof (CHAR);
469 /* Initialize buf2 to the same values as buf1. The bug requires the
470 last compared byte to be different. */
471 memcpy (buf2, buf1, page_size);
472 ((char *) buf2)[page_size - 1] ^= 0x11;
474 for (size_t length = 1; length < max_length; length++)
476 CHAR *s1 = (CHAR *) buf1 + max_length - length;
477 CHAR *s2 = (CHAR *) buf2 + max_length - length;
479 const int exp_result = SIMPLE_MEMCMP (s1, s2, length);
481 FOR_EACH_IMPL (impl, 0)
482 check_result (impl, s1, s2, length, exp_result);
497 FOR_EACH_IMPL (impl, 0)
498 printf ("\t%s", impl->name);
501 for (i = 1; i < 32; ++i)
503 do_test (i * CHARBYTES, i * CHARBYTES, i, 0);
504 do_test (i * CHARBYTES, i * CHARBYTES, i, 1);
505 do_test (i * CHARBYTES, i * CHARBYTES, i, -1);
508 for (i = 0; i < 32; ++i)
510 do_test (0, 0, i, 0);
511 do_test (0, 0, i, 1);
512 do_test (0, 0, i, -1);
513 do_test (4096 - i, 0, i, 0);
514 do_test (4096 - i, 0, i, 1);
515 do_test (4096 - i, 0, i, -1);
516 do_test (4095, 0, i, 0);
517 do_test (4095, 0, i, 1);
518 do_test (4095, 0, i, -1);
519 do_test (4095, 4095, i, 0);
520 do_test (4095, 4095, i, 1);
521 do_test (4095, 4095, i, -1);
522 do_test (4000, 95, i, 0);
523 do_test (4000, 95, i, 1);
524 do_test (4000, 95, i, -1);
527 for (i = 33; i < 385; i += 32)
529 do_test (0, 0, i, 0);
530 do_test (0, 0, i, 1);
531 do_test (0, 0, i, -1);
532 do_test (i, 0, i, 0);
533 do_test (0, i, i, 1);
534 do_test (i, i, i, -1);
537 for (i = 1; i < 10; ++i)
539 do_test (0, 0, 2 << i, 0);
540 do_test (0, 0, 2 << i, 1);
541 do_test (0, 0, 2 << i, -1);
542 do_test ((8 - i) * CHARBYTES, (2 * i) * CHARBYTES, 16 << i, 0);
543 do_test (0, 0, 16 << i, 0);
544 do_test (0, 0, 16 << i, 1);
545 do_test (0, 0, 16 << i, -1);
546 do_test (i, 0, 2 << i, 0);
547 do_test (0, i, 2 << i, 1);
548 do_test (i, i, 2 << i, -1);
549 do_test (i, 0, 16 << i, 0);
550 do_test (0, i, 16 << i, 1);
551 do_test (i, i, 16 << i, -1);
554 for (i = 1; i < 10; ++i)
556 do_test (i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, 0);
557 do_test (i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, 1);
558 do_test (i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, -1);
565 #include <support/test-driver.c>