394 lines
9.3 KiB
C
394 lines
9.3 KiB
C
/* Test and measure strncmp functions.
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Copyright (C) 1999-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Written by Jakub Jelinek <jakub@redhat.com>, 1999.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#define TEST_MAIN
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#define TEST_NAME "strncmp"
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#include "test-string.h"
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typedef int (*proto_t) (const char *, const char *, size_t);
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int simple_strncmp (const char *, const char *, size_t);
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int stupid_strncmp (const char *, const char *, size_t);
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IMPL (stupid_strncmp, 0)
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IMPL (simple_strncmp, 0)
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IMPL (strncmp, 1)
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int
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simple_strncmp (const char *s1, const char *s2, size_t n)
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{
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int ret = 0;
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while (n-- && (ret = *(unsigned char *) s1 - * (unsigned char *) s2++) == 0
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&& *s1++);
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return ret;
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}
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int
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stupid_strncmp (const char *s1, const char *s2, size_t n)
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{
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size_t ns1 = strnlen (s1, n) + 1, ns2 = strnlen (s2, n) + 1;
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int ret = 0;
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n = ns1 < n ? ns1 : n;
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n = ns2 < n ? ns2 : n;
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while (n-- && (ret = *(unsigned char *) s1++ - * (unsigned char *) s2++) == 0);
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return ret;
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}
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static int
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check_result (impl_t *impl, const char *s1, const char *s2, size_t n,
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int exp_result)
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{
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int result = CALL (impl, s1, s2, n);
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if ((exp_result == 0 && result != 0)
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|| (exp_result < 0 && result >= 0)
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|| (exp_result > 0 && result <= 0))
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{
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error (0, 0, "Wrong result in function %s %d %d", impl->name,
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result, exp_result);
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ret = 1;
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return -1;
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}
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return 0;
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}
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static void
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do_one_test (impl_t *impl, const char *s1, const char *s2, size_t n,
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int exp_result)
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{
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if (check_result (impl, s1, s2, n, exp_result) < 0)
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return;
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}
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static void
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do_test_limit (size_t align1, size_t align2, size_t len, size_t n, int max_char,
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int exp_result)
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{
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size_t i, align_n;
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char *s1, *s2;
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if (n == 0)
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{
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s1 = (char*)(buf1 + page_size);
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s2 = (char*)(buf2 + page_size);
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FOR_EACH_IMPL (impl, 0)
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do_one_test (impl, s1, s2, n, 0);
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return;
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}
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align1 &= 15;
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align2 &= 15;
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align_n = (page_size - n) & 15;
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s1 = (char*)(buf1 + page_size - n);
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s2 = (char*)(buf2 + page_size - n);
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if (align1 < align_n)
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s1 -= (align_n - align1);
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if (align2 < align_n)
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s2 -= (align_n - align2);
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for (i = 0; i < n; i++)
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s1[i] = s2[i] = 1 + 23 * i % max_char;
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if (len < n)
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{
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s1[len] = 0;
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s2[len] = 0;
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if (exp_result < 0)
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s2[len] = 32;
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else if (exp_result > 0)
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s1[len] = 64;
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}
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FOR_EACH_IMPL (impl, 0)
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do_one_test (impl, s1, s2, n, exp_result);
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}
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static void
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do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char,
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int exp_result)
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{
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size_t i;
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char *s1, *s2;
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if (n == 0)
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return;
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align1 &= 7;
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if (align1 + n + 1 >= page_size)
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return;
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align2 &= 7;
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if (align2 + n + 1 >= page_size)
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return;
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s1 = (char*)(buf1 + align1);
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s2 = (char*)(buf2 + align2);
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for (i = 0; i < n; i++)
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s1[i] = s2[i] = 1 + 23 * i % max_char;
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s1[n] = 24 + exp_result;
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s2[n] = 23;
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s1[len] = 0;
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s2[len] = 0;
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if (exp_result < 0)
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s2[len] = 32;
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else if (exp_result > 0)
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s1[len] = 64;
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if (len >= n)
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s2[n - 1] -= exp_result;
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FOR_EACH_IMPL (impl, 0)
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do_one_test (impl, (char*)s1, (char*)s2, n, exp_result);
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}
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static void
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do_page_test (size_t offset1, size_t offset2, char *s2)
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{
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char *s1;
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int exp_result;
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if (offset1 >= page_size || offset2 >= page_size)
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return;
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s1 = (char *) (buf1 + offset1);
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s2 += offset2;
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exp_result= *s1;
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FOR_EACH_IMPL (impl, 0)
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{
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check_result (impl, s1, s2, page_size, -exp_result);
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check_result (impl, s2, s1, page_size, exp_result);
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}
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}
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static void
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do_random_tests (void)
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{
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size_t i, j, n, align1, align2, pos, len1, len2, size;
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int result;
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long r;
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unsigned char *p1 = buf1 + page_size - 512;
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unsigned char *p2 = buf2 + page_size - 512;
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for (n = 0; n < ITERATIONS; n++)
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{
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align1 = random () & 31;
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if (random () & 1)
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align2 = random () & 31;
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else
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align2 = align1 + (random () & 24);
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pos = random () & 511;
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size = random () & 511;
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j = align1 > align2 ? align1 : align2;
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if (pos + j >= 511)
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pos = 510 - j - (random () & 7);
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len1 = random () & 511;
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if (pos >= len1 && (random () & 1))
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len1 = pos + (random () & 7);
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if (len1 + j >= 512)
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len1 = 511 - j - (random () & 7);
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if (pos >= len1)
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len2 = len1;
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else
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len2 = len1 + (len1 != 511 - j ? random () % (511 - j - len1) : 0);
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j = (pos > len2 ? pos : len2) + align1 + 64;
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if (j > 512)
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j = 512;
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for (i = 0; i < j; ++i)
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{
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p1[i] = random () & 255;
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if (i < len1 + align1 && !p1[i])
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{
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p1[i] = random () & 255;
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if (!p1[i])
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p1[i] = 1 + (random () & 127);
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}
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}
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for (i = 0; i < j; ++i)
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{
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p2[i] = random () & 255;
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if (i < len2 + align2 && !p2[i])
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{
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p2[i] = random () & 255;
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if (!p2[i])
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p2[i] = 1 + (random () & 127);
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}
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}
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result = 0;
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memcpy (p2 + align2, p1 + align1, pos);
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if (pos < len1)
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{
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if (p2[align2 + pos] == p1[align1 + pos])
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{
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p2[align2 + pos] = random () & 255;
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if (p2[align2 + pos] == p1[align1 + pos])
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p2[align2 + pos] = p1[align1 + pos] + 3 + (random () & 127);
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}
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if (pos < size)
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{
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if (p1[align1 + pos] < p2[align2 + pos])
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result = -1;
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else
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result = 1;
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}
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}
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p1[len1 + align1] = 0;
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p2[len2 + align2] = 0;
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FOR_EACH_IMPL (impl, 1)
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{
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r = CALL (impl, (char*)(p1 + align1), (char*)(p2 + align2), size);
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/* Test whether on 64-bit architectures where ABI requires
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callee to promote has the promotion been done. */
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asm ("" : "=g" (r) : "0" (r));
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if ((r == 0 && result)
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|| (r < 0 && result >= 0)
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|| (r > 0 && result <= 0))
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{
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error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd, %zd, %zd, %zd) %ld != %d, p1 %p p2 %p",
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n, impl->name, align1, align2, len1, len2, pos, size, r, result, p1, p2);
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ret = 1;
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}
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}
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}
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}
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static void
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check1 (void)
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{
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char *s1 = (char *)(buf1 + 0xb2c);
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char *s2 = (char *)(buf1 + 0xfd8);
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size_t i;
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int exp_result;
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strcpy(s1, "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrs");
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strcpy(s2, "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkLMNOPQRSTUV");
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for (i = 0; i < 80; i++)
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{
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exp_result = simple_strncmp (s1, s2, i);
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FOR_EACH_IMPL (impl, 0)
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check_result (impl, s1, s2, i, exp_result);
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}
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}
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static void
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check2 (void)
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{
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size_t i;
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char *s1, *s2;
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s1 = (char *) buf1;
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for (i = 0; i < page_size - 1; i++)
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s1[i] = 23;
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s1[i] = 0;
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s2 = strdup (s1);
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for (i = 0; i < 64; ++i)
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do_page_test (3990 + i, 2635, s2);
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free (s2);
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}
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int
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test_main (void)
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{
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size_t i;
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test_init ();
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check1 ();
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check2 ();
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printf ("%23s", "");
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FOR_EACH_IMPL (impl, 0)
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printf ("\t%s", impl->name);
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putchar ('\n');
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for (i =0; i < 16; ++i)
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{
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do_test (0, 0, 8, i, 127, 0);
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do_test (0, 0, 8, i, 127, -1);
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do_test (0, 0, 8, i, 127, 1);
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do_test (i, i, 8, i, 127, 0);
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do_test (i, i, 8, i, 127, 1);
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do_test (i, i, 8, i, 127, -1);
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do_test (i, 2 * i, 8, i, 127, 0);
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do_test (2 * i, i, 8, i, 127, 1);
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do_test (i, 3 * i, 8, i, 127, -1);
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do_test (0, 0, 8, i, 255, 0);
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do_test (0, 0, 8, i, 255, -1);
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do_test (0, 0, 8, i, 255, 1);
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do_test (i, i, 8, i, 255, 0);
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do_test (i, i, 8, i, 255, 1);
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do_test (i, i, 8, i, 255, -1);
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do_test (i, 2 * i, 8, i, 255, 0);
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do_test (2 * i, i, 8, i, 255, 1);
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do_test (i, 3 * i, 8, i, 255, -1);
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}
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for (i = 1; i < 8; ++i)
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{
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do_test (0, 0, 8 << i, 16 << i, 127, 0);
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do_test (0, 0, 8 << i, 16 << i, 127, 1);
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do_test (0, 0, 8 << i, 16 << i, 127, -1);
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do_test (0, 0, 8 << i, 16 << i, 255, 0);
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do_test (0, 0, 8 << i, 16 << i, 255, 1);
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do_test (0, 0, 8 << i, 16 << i, 255, -1);
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do_test (8 - i, 2 * i, 8 << i, 16 << i, 127, 0);
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do_test (8 - i, 2 * i, 8 << i, 16 << i, 127, 1);
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do_test (2 * i, i, 8 << i, 16 << i, 255, 0);
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do_test (2 * i, i, 8 << i, 16 << i, 255, 1);
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}
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do_test_limit (0, 0, 0, 0, 127, 0);
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do_test_limit (4, 0, 21, 20, 127, 0);
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do_test_limit (0, 4, 21, 20, 127, 0);
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do_test_limit (8, 0, 25, 24, 127, 0);
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do_test_limit (0, 8, 25, 24, 127, 0);
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for (i = 0; i < 8; ++i)
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{
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do_test_limit (0, 0, 17 - i, 16 - i, 127, 0);
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do_test_limit (0, 0, 17 - i, 16 - i, 255, 0);
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do_test_limit (0, 0, 15 - i, 16 - i, 127, 0);
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do_test_limit (0, 0, 15 - i, 16 - i, 127, 1);
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do_test_limit (0, 0, 15 - i, 16 - i, 127, -1);
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do_test_limit (0, 0, 15 - i, 16 - i, 255, 0);
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do_test_limit (0, 0, 15 - i, 16 - i, 255, 1);
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do_test_limit (0, 0, 15 - i, 16 - i, 255, -1);
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}
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do_random_tests ();
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return ret;
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}
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#include "../test-skeleton.c"
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