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glibc-2.41
string/test-memcmp.c
565 строк
12 KB
Paul Eggert
Update copyright dates with scripts/update-copyrights
01 янв 2025, 22:22
01 янв 2025, 22:22
2642002
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/* Test and measure memcmp functions. Copyright (C) 1999-2025 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ #define TEST_MAIN #ifdef TEST_MEMCMPEQ # define TEST_NAME "__memcmpeq" #elif defined WIDE # define TEST_NAME "wmemcmp" #else # define TEST_NAME "memcmp" #endif #include "test-string.h" #ifdef WIDE # include <inttypes.h> # include <wchar.h> # define MEMCMP wmemcmp # define MEMCPY wmemcpy # define SIMPLE_MEMCMP simple_wmemcmp # define CHAR wchar_t # define UCHAR wchar_t # define CHARBYTES 4 # define CHAR__MIN WCHAR_MIN # define CHAR__MAX WCHAR_MAX int SIMPLE_MEMCMP (const wchar_t *s1, const wchar_t *s2, size_t n) { int ret = 0; /* Warning! wmemcmp has to use SIGNED comparison for elements. memcmp has to use UNSIGNED comparison for elements. */ while (n-- && (ret = *s1 < *s2 ? -1 : *s1 == *s2 ? 0 : 1) == 0) {s1++; s2++;} return ret; } #else # include <limits.h> # ifdef TEST_MEMCMPEQ # define MEMCMP __memcmpeq # define SIMPLE_MEMCMP simple_memcmpeq # else # define MEMCMP memcmp # define SIMPLE_MEMCMP simple_memcmp # endif # define MEMCPY memcpy # define CHAR char # define MAX_CHAR 255 # define UCHAR unsigned char # define CHARBYTES 1 # define CHAR__MIN CHAR_MIN # define CHAR__MAX CHAR_MAX int SIMPLE_MEMCMP (const char *s1, const char *s2, size_t n) { int ret = 0; while (n-- && (ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) == 0); return ret; } #endif #ifndef BAD_RESULT # define BAD_RESULT(result, expec) \ (((result) == 0 && (expec)) || ((result) < 0 && (expec) >= 0) || \ ((result) > 0 && (expec) <= 0)) # endif typedef int (*proto_t) (const CHAR *, const CHAR *, size_t); IMPL (MEMCMP, 1) static int check_result (impl_t *impl, const CHAR *s1, const CHAR *s2, size_t len, int exp_result) { int result = CALL (impl, s1, s2, len); if (BAD_RESULT(result, exp_result)) { error (0, 0, "Wrong result in function %s %d %d", impl->name, result, exp_result); ret = 1; return -1; } return 0; } static void do_one_test (impl_t *impl, const CHAR *s1, const CHAR *s2, size_t len, int exp_result) { if (check_result (impl, s1, s2, len, exp_result) < 0) return; } static void do_test (size_t align1, size_t align2, size_t len, int exp_result) { size_t i; CHAR *s1, *s2; align1 &= (4096 - CHARBYTES); if (align1 + (len + 1) * CHARBYTES >= page_size) return; align2 &= (4096 - CHARBYTES); if (align2 + (len + 1) * CHARBYTES >= page_size) return; s1 = (CHAR *) (buf1 + align1); s2 = (CHAR *) (buf2 + align2); for (i = 0; i < len; i++) s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % CHAR__MAX; if (len) { s1[len] = align1; s2[len] = align2; s2[len - 1] -= exp_result; } else { exp_result = 0; } FOR_EACH_IMPL (impl, 0) do_one_test (impl, s1, s2, len, exp_result); } static void do_random_tests (void) { size_t i, j, n, align1, align2, pos, len; int result; long r; UCHAR *p1 = (UCHAR *) (buf1 + page_size - 512 * CHARBYTES); UCHAR *p2 = (UCHAR *) (buf2 + page_size - 512 * CHARBYTES); for (n = 0; n < ITERATIONS; n++) { align1 = random () & 31; if (random () & 1) align2 = random () & 31; else align2 = align1 + (random () & 24); pos = random () & 511; j = align1; if (align2 > j) j = align2; if (pos + j >= 512) pos = 511 - j - (random () & 7); len = random () & 511; if (len + j >= 512) len = 511 - j - (random () & 7); j = len + align1 + 64; if (j > 512) j = 512; for (i = 0; i < j; ++i) p1[i] = random () & 255; for (i = 0; i < j; ++i) p2[i] = random () & 255; result = 0; if (pos >= len) MEMCPY ((CHAR *) p2 + align2, (const CHAR *) p1 + align1, len); else { MEMCPY ((CHAR *) p2 + align2, (const CHAR *) p1 + align1, pos); if (p2[align2 + pos] == p1[align1 + pos]) { p2[align2 + pos] = random () & 255; if (p2[align2 + pos] == p1[align1 + pos]) p2[align2 + pos] = p1[align1 + pos] + 3 + (random () & 127); } if (p1[align1 + pos] < p2[align2 + pos]) result = -1; else result = 1; } FOR_EACH_IMPL (impl, 1) { r = CALL (impl, (CHAR *) p1 + align1, (const CHAR *) p2 + align2, len); if (BAD_RESULT(r, result)) { error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd, %zd) %ld != %d, p1 %p p2 %p", n, impl->name, align1 * CHARBYTES & 63, align2 * CHARBYTES & 63, len, pos, r, result, p1, p2); ret = 1; } } } } static void check1 (void) { CHAR s1[116], s2[116]; int n, exp_result; s1[0] = -108; s2[0] = -108; s1[1] = 99; s2[1] = 99; s1[2] = -113; s2[2] = -113; s1[3] = 1; s2[3] = 1; s1[4] = 116; s2[4] = 116; s1[5] = 99; s2[5] = 99; s1[6] = -113; s2[6] = -113; s1[7] = 1; s2[7] = 1; s1[8] = 84; s2[8] = 84; s1[9] = 99; s2[9] = 99; s1[10] = -113; s2[10] = -113; s1[11] = 1; s2[11] = 1; s1[12] = 52; s2[12] = 52; s1[13] = 99; s2[13] = 99; s1[14] = -113; s2[14] = -113; s1[15] = 1; s2[15] = 1; s1[16] = -76; s2[16] = -76; s1[17] = -14; s2[17] = -14; s1[18] = -109; s2[18] = -109; s1[19] = 1; s2[19] = 1; s1[20] = -108; s2[20] = -108; s1[21] = -14; s2[21] = -14; s1[22] = -109; s2[22] = -109; s1[23] = 1; s2[23] = 1; s1[24] = 84; s2[24] = 84; s1[25] = -15; s2[25] = -15; s1[26] = -109; s2[26] = -109; s1[27] = 1; s2[27] = 1; s1[28] = 52; s2[28] = 52; s1[29] = -15; s2[29] = -15; s1[30] = -109; s2[30] = -109; s1[31] = 1; s2[31] = 1; s1[32] = 20; s2[32] = 20; s1[33] = -15; s2[33] = -15; s1[34] = -109; s2[34] = -109; s1[35] = 1; s2[35] = 1; s1[36] = 20; s2[36] = 20; s1[37] = -14; s2[37] = -14; s1[38] = -109; s2[38] = -109; s1[39] = 1; s2[39] = 1; s1[40] = 52; s2[40] = 52; s1[41] = -14; s2[41] = -14; s1[42] = -109; s2[42] = -109; s1[43] = 1; s2[43] = 1; s1[44] = 84; s2[44] = 84; s1[45] = -14; s2[45] = -14; s1[46] = -109; s2[46] = -109; s1[47] = 1; s2[47] = 1; s1[48] = 116; s2[48] = 116; s1[49] = -14; s2[49] = -14; s1[50] = -109; s2[50] = -109; s1[51] = 1; s2[51] = 1; s1[52] = 116; s2[52] = 116; s1[53] = -15; s2[53] = -15; s1[54] = -109; s2[54] = -109; s1[55] = 1; s2[55] = 1; s1[56] = -44; s2[56] = -44; s1[57] = -14; s2[57] = -14; s1[58] = -109; s2[58] = -109; s1[59] = 1; s2[59] = 1; s1[60] = -108; s2[60] = -108; s1[61] = -15; s2[61] = -15; s1[62] = -109; s2[62] = -109; s1[63] = 1; s2[63] = 1; s1[64] = -76; s2[64] = -76; s1[65] = -15; s2[65] = -15; s1[66] = -109; s2[66] = -109; s1[67] = 1; s2[67] = 1; s1[68] = -44; s2[68] = -44; s1[69] = -15; s2[69] = -15; s1[70] = -109; s2[70] = -109; s1[71] = 1; s2[71] = 1; s1[72] = -12; s2[72] = -12; s1[73] = -15; s2[73] = -15; s1[74] = -109; s2[74] = -109; s1[75] = 1; s2[75] = 1; s1[76] = -12; s2[76] = -12; s1[77] = -14; s2[77] = -14; s1[78] = -109; s2[78] = -109; s1[79] = 1; s2[79] = 1; s1[80] = 20; s2[80] = -68; s1[81] = -12; s2[81] = 64; s1[82] = -109; s2[82] = -106; s1[83] = 1; s2[83] = 1; s1[84] = -12; s2[84] = -12; s1[85] = -13; s2[85] = -13; s1[86] = -109; s2[86] = -109; s1[87] = 1; s2[87] = 1; s1[88] = -44; s2[88] = -44; s1[89] = -13; s2[89] = -13; s1[90] = -109; s2[90] = -109; s1[91] = 1; s2[91] = 1; s1[92] = -76; s2[92] = -76; s1[93] = -13; s2[93] = -13; s1[94] = -109; s2[94] = -109; s1[95] = 1; s2[95] = 1; s1[96] = -108; s2[96] = -108; s1[97] = -13; s2[97] = -13; s1[98] = -109; s2[98] = -109; s1[99] = 1; s2[99] = 1; s1[100] = 116; s2[100] = 116; s1[101] = CHAR__MIN; s2[101] = CHAR__MAX; s1[102] = -109; s2[102] = -109; s1[103] = 1; s2[103] = 1; s1[104] = 84; s2[104] = 84; s1[105] = -13; s2[105] = -13; s1[106] = -109; s2[106] = -109; s1[107] = 1; s2[107] = 1; s1[108] = 52; s2[108] = 52; s1[109] = -13; s2[109] = -13; s1[110] = -109; s2[110] = -109; s1[111] = 1; s2[111] = 1; s1[112] = CHAR__MAX; s2[112] = CHAR__MIN; s1[113] = -13; s2[113] = -13; s1[114] = -109; s2[114] = -109; s1[115] = 1; s2[115] = 1; n = 116; for (size_t i = 0; i < n; i++) for (size_t len = 0; len <= n - i; ++len) { exp_result = SIMPLE_MEMCMP (s1 + i, s2 + i, len); FOR_EACH_IMPL (impl, 0) check_result (impl, s1 + i, s2 + i, len, exp_result); } } /* This test checks that memcmp doesn't overrun buffers. */ static void check2 (void) { size_t max_length = page_size / sizeof (CHAR); /* Initialize buf2 to the same values as buf1. The bug requires the last compared byte to be different. */ memcpy (buf2, buf1, page_size); ((char *) buf2)[page_size - 1] ^= 0x11; for (size_t length = 1; length < max_length; length++) { CHAR *s1 = (CHAR *) buf1 + max_length - length; CHAR *s2 = (CHAR *) buf2 + max_length - length; const int exp_result = SIMPLE_MEMCMP (s1, s2, length); FOR_EACH_IMPL (impl, 0) check_result (impl, s1, s2, length, exp_result); } } int test_main (void) { size_t i; test_init (); check1 (); check2 (); printf ("%23s", ""); FOR_EACH_IMPL (impl, 0) printf ("\t%s", impl->name); putchar ('\n'); for (i = 1; i < 32; ++i) { do_test (i * CHARBYTES, i * CHARBYTES, i, 0); do_test (i * CHARBYTES, i * CHARBYTES, i, 1); do_test (i * CHARBYTES, i * CHARBYTES, i, -1); } for (i = 0; i < 32; ++i) { do_test (0, 0, i, 0); do_test (0, 0, i, 1); do_test (0, 0, i, -1); do_test (4096 - i, 0, i, 0); do_test (4096 - i, 0, i, 1); do_test (4096 - i, 0, i, -1); do_test (4095, 0, i, 0); do_test (4095, 0, i, 1); do_test (4095, 0, i, -1); do_test (4095, 4095, i, 0); do_test (4095, 4095, i, 1); do_test (4095, 4095, i, -1); do_test (4000, 95, i, 0); do_test (4000, 95, i, 1); do_test (4000, 95, i, -1); } for (i = 33; i < 385; i += 32) { do_test (0, 0, i, 0); do_test (0, 0, i, 1); do_test (0, 0, i, -1); do_test (i, 0, i, 0); do_test (0, i, i, 1); do_test (i, i, i, -1); } for (i = 1; i < 10; ++i) { do_test (0, 0, 2 << i, 0); do_test (0, 0, 2 << i, 1); do_test (0, 0, 2 << i, -1); do_test ((8 - i) * CHARBYTES, (2 * i) * CHARBYTES, 16 << i, 0); do_test (0, 0, 16 << i, 0); do_test (0, 0, 16 << i, 1); do_test (0, 0, 16 << i, -1); do_test (i, 0, 2 << i, 0); do_test (0, i, 2 << i, 1); do_test (i, i, 2 << i, -1); do_test (i, 0, 16 << i, 0); do_test (0, i, 16 << i, 1); do_test (i, i, 16 << i, -1); } for (i = 1; i < 10; ++i) { do_test (i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, 0); do_test (i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, 1); do_test (i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, -1); } do_random_tests (); return ret; } #include <support/test-driver.c>