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glibc/string/test-strncmp.c
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/* Test strncmp and wcsncmp functions. | |
Copyright (C) 1999-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Written by Jakub Jelinek <jakub@redhat.com>, 1999. | |
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 | |
<http://www.gnu.org/licenses/>. */ | |
#define TEST_MAIN | |
#ifdef WIDE | |
# define TEST_NAME "wcsncmp" | |
#else | |
# define TEST_NAME "strncmp" | |
#endif | |
#include "test-string.h" | |
#ifdef WIDE | |
# include <wchar.h> | |
# define L(str) L##str | |
# define STRNCMP wcsncmp | |
# define STRCPY wcscpy | |
# define STRDUP wcsdup | |
# define MEMCPY wmemcpy | |
# define SIMPLE_STRNCMP simple_wcsncmp | |
# define STUPID_STRNCMP stupid_wcsncmp | |
# define CHAR wchar_t | |
# define UCHAR wchar_t | |
# define CHARBYTES 4 | |
# define CHAR__MAX WCHAR_MAX | |
# define CHAR__MIN WCHAR_MIN | |
/* Wcsncmp uses signed semantics for comparison, not unsigned. | |
Avoid using substraction since possible overflow */ | |
int | |
simple_wcsncmp (const CHAR *s1, const CHAR *s2, size_t n) | |
{ | |
wchar_t c1, c2; | |
while (n--) | |
{ | |
c1 = *s1++; | |
c2 = *s2++; | |
if (c1 == L('\0') || c1 != c2) | |
return c1 > c2 ? 1 : (c1 < c2 ? -1 : 0); | |
} | |
return 0; | |
} | |
int | |
stupid_wcsncmp (const CHAR *s1, const CHAR *s2, size_t n) | |
{ | |
wchar_t c1, c2; | |
size_t ns1 = wcsnlen (s1, n) + 1, ns2 = wcsnlen (s2, n) + 1; | |
n = ns1 < n ? ns1 : n; | |
n = ns2 < n ? ns2 : n; | |
while (n--) | |
{ | |
c1 = *s1++; | |
c2 = *s2++; | |
if (c1 != c2) | |
return c1 > c2 ? 1 : -1; | |
} | |
return 0; | |
} | |
#else | |
# define L(str) str | |
# define STRNCMP strncmp | |
# define STRCPY strcpy | |
# define STRDUP strdup | |
# define MEMCPY memcpy | |
# define SIMPLE_STRNCMP simple_strncmp | |
# define STUPID_STRNCMP stupid_strncmp | |
# define CHAR char | |
# define UCHAR unsigned char | |
# define CHARBYTES 1 | |
# define CHAR__MAX CHAR_MAX | |
# define CHAR__MIN CHAR_MIN | |
/* Strncmp uses unsigned semantics for comparison. */ | |
int | |
simple_strncmp (const char *s1, const char *s2, size_t n) | |
{ | |
int ret = 0; | |
while (n-- && (ret = *(unsigned char *) s1 - * (unsigned char *) s2++) == 0 | |
&& *s1++); | |
return ret; | |
} | |
int | |
stupid_strncmp (const char *s1, const char *s2, size_t n) | |
{ | |
size_t ns1 = strnlen (s1, n) + 1, ns2 = strnlen (s2, n) + 1; | |
int ret = 0; | |
n = ns1 < n ? ns1 : n; | |
n = ns2 < n ? ns2 : n; | |
while (n-- && (ret = *(unsigned char *) s1++ - * (unsigned char *) s2++) == 0); | |
return ret; | |
} | |
#endif | |
typedef int (*proto_t) (const CHAR *, const CHAR *, size_t); | |
IMPL (STUPID_STRNCMP, 0) | |
IMPL (SIMPLE_STRNCMP, 0) | |
IMPL (STRNCMP, 1) | |
static int | |
check_result (impl_t *impl, const CHAR *s1, const CHAR *s2, size_t n, | |
int exp_result) | |
{ | |
int result = CALL (impl, s1, s2, n); | |
if ((exp_result == 0 && result != 0) | |
|| (exp_result < 0 && result >= 0) | |
|| (exp_result > 0 && result <= 0)) | |
{ | |
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 n, | |
int exp_result) | |
{ | |
if (check_result (impl, s1, s2, n, exp_result) < 0) | |
return; | |
} | |
static void | |
do_test_limit (size_t align1, size_t align2, size_t len, size_t n, int max_char, | |
int exp_result) | |
{ | |
size_t i, align_n; | |
CHAR *s1, *s2; | |
if (n == 0) | |
{ | |
s1 = (CHAR *) (buf1 + page_size); | |
s2 = (CHAR *) (buf2 + page_size); | |
FOR_EACH_IMPL (impl, 0) | |
do_one_test (impl, s1, s2, n, 0); | |
return; | |
} | |
align1 &= 15; | |
align2 &= 15; | |
align_n = (page_size - n * CHARBYTES) & 15; | |
s1 = (CHAR *) (buf1 + page_size - n * CHARBYTES); | |
s2 = (CHAR *) (buf2 + page_size - n * CHARBYTES); | |
if (align1 < align_n) | |
s1 = (CHAR *) ((char *) s1 - (align_n - align1)); | |
if (align2 < align_n) | |
s2 = (CHAR *) ((char *) s2 - (align_n - align2)); | |
for (i = 0; i < n; i++) | |
s1[i] = s2[i] = 1 + 23 * i % max_char; | |
if (len < n) | |
{ | |
s1[len] = 0; | |
s2[len] = 0; | |
if (exp_result < 0) | |
s2[len] = 32; | |
else if (exp_result > 0) | |
s1[len] = 64; | |
} | |
FOR_EACH_IMPL (impl, 0) | |
do_one_test (impl, s1, s2, n, exp_result); | |
} | |
static void | |
do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char, | |
int exp_result) | |
{ | |
size_t i; | |
CHAR *s1, *s2; | |
if (n == 0) | |
return; | |
align1 &= 63; | |
if (align1 + (n + 1) * CHARBYTES >= page_size) | |
return; | |
align2 &= 63; | |
if (align2 + (n + 1) * CHARBYTES >= page_size) | |
return; | |
s1 = (CHAR *) (buf1 + align1); | |
s2 = (CHAR *) (buf2 + align2); | |
for (i = 0; i < n; i++) | |
s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char; | |
s1[n] = 24 + exp_result; | |
s2[n] = 23; | |
s1[len] = 0; | |
s2[len] = 0; | |
if (exp_result < 0) | |
s2[len] = 32; | |
else if (exp_result > 0) | |
s1[len] = 64; | |
if (len >= n) | |
s2[n - 1] -= exp_result; | |
FOR_EACH_IMPL (impl, 0) | |
do_one_test (impl, s1, s2, n, exp_result); | |
} | |
static void | |
do_page_test (size_t offset1, size_t offset2, CHAR *s2) | |
{ | |
CHAR *s1; | |
int exp_result; | |
if (offset1 * CHARBYTES >= page_size || offset2 * CHARBYTES >= page_size) | |
return; | |
s1 = (CHAR *) buf1; | |
s1 += offset1; | |
s2 += offset2; | |
exp_result= *s1; | |
FOR_EACH_IMPL (impl, 0) | |
{ | |
check_result (impl, s1, s2, page_size, -exp_result); | |
check_result (impl, s2, s1, page_size, exp_result); | |
} | |
} | |
static void | |
do_random_tests (void) | |
{ | |
size_t i, j, n, align1, align2, pos, len1, len2, size; | |
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; | |
size = random () & 511; | |
j = align1 > align2 ? align1 : align2; | |
if (pos + j >= 511) | |
pos = 510 - j - (random () & 7); | |
len1 = random () & 511; | |
if (pos >= len1 && (random () & 1)) | |
len1 = pos + (random () & 7); | |
if (len1 + j >= 512) | |
len1 = 511 - j - (random () & 7); | |
if (pos >= len1) | |
len2 = len1; | |
else | |
len2 = len1 + (len1 != 511 - j ? random () % (511 - j - len1) : 0); | |
j = (pos > len2 ? pos : len2) + align1 + 64; | |
if (j > 512) | |
j = 512; | |
for (i = 0; i < j; ++i) | |
{ | |
p1[i] = random () & 255; | |
if (i < len1 + align1 && !p1[i]) | |
{ | |
p1[i] = random () & 255; | |
if (!p1[i]) | |
p1[i] = 1 + (random () & 127); | |
} | |
} | |
for (i = 0; i < j; ++i) | |
{ | |
p2[i] = random () & 255; | |
if (i < len2 + align2 && !p2[i]) | |
{ | |
p2[i] = random () & 255; | |
if (!p2[i]) | |
p2[i] = 1 + (random () & 127); | |
} | |
} | |
result = 0; | |
MEMCPY (p2 + align2, p1 + align1, pos); | |
if (pos < len1) | |
{ | |
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 (pos < size) | |
{ | |
if (p1[align1 + pos] < p2[align2 + pos]) | |
result = -1; | |
else | |
result = 1; | |
} | |
} | |
p1[len1 + align1] = 0; | |
p2[len2 + align2] = 0; | |
FOR_EACH_IMPL (impl, 1) | |
{ | |
r = CALL (impl, (CHAR *) (p1 + align1), (CHAR *) (p2 + align2), size); | |
/* Test whether on 64-bit architectures where ABI requires | |
callee to promote has the promotion been done. */ | |
asm ("" : "=g" (r) : "0" (r)); | |
if ((r == 0 && result) | |
|| (r < 0 && result >= 0) | |
|| (r > 0 && result <= 0)) | |
{ | |
error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd, %zd, %zd, %zd) %ld != %d, p1 %p p2 %p", | |
n, impl->name, align1, align2, len1, len2, pos, size, r, result, p1, p2); | |
ret = 1; | |
} | |
} | |
} | |
} | |
static void | |
check1 (void) | |
{ | |
CHAR *s1 = (CHAR *) (buf1 + 0xb2c); | |
CHAR *s2 = (CHAR *) (buf1 + 0xfd8); | |
size_t i, offset; | |
int exp_result; | |
STRCPY(s1, L("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrs")); | |
STRCPY(s2, L("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkLMNOPQRSTUV")); | |
/* Check possible overflow bug for wcsncmp */ | |
s1[4] = CHAR__MAX; | |
s2[4] = CHAR__MIN; | |
for (offset = 0; offset < 6; offset++) | |
{ | |
for (i = 0; i < 80; i++) | |
{ | |
exp_result = SIMPLE_STRNCMP (s1 + offset, s2 + offset, i); | |
FOR_EACH_IMPL (impl, 0) | |
check_result (impl, s1 + offset, s2 + offset, i, exp_result); | |
} | |
} | |
} | |
static void | |
check2 (void) | |
{ | |
size_t i; | |
CHAR *s1, *s2; | |
s1 = (CHAR *) buf1; | |
for (i = 0; i < (page_size / CHARBYTES) - 1; i++) | |
s1[i] = 23; | |
s1[i] = 0; | |
s2 = STRDUP (s1); | |
for (i = 0; i < 64; ++i) | |
do_page_test ((3988 / CHARBYTES) + i, (2636 / CHARBYTES), s2); | |
free (s2); | |
} | |
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 =0; i < 16; ++i) | |
{ | |
do_test (0, 0, 8, i, 127, 0); | |
do_test (0, 0, 8, i, 127, -1); | |
do_test (0, 0, 8, i, 127, 1); | |
do_test (i, i, 8, i, 127, 0); | |
do_test (i, i, 8, i, 127, 1); | |
do_test (i, i, 8, i, 127, -1); | |
do_test (i, 2 * i, 8, i, 127, 0); | |
do_test (2 * i, i, 8, i, 127, 1); | |
do_test (i, 3 * i, 8, i, 127, -1); | |
do_test (0, 0, 8, i, 255, 0); | |
do_test (0, 0, 8, i, 255, -1); | |
do_test (0, 0, 8, i, 255, 1); | |
do_test (i, i, 8, i, 255, 0); | |
do_test (i, i, 8, i, 255, 1); | |
do_test (i, i, 8, i, 255, -1); | |
do_test (i, 2 * i, 8, i, 255, 0); | |
do_test (2 * i, i, 8, i, 255, 1); | |
do_test (i, 3 * i, 8, i, 255, -1); | |
} | |
for (i = 1; i < 8; ++i) | |
{ | |
do_test (0, 0, 8 << i, 16 << i, 127, 0); | |
do_test (0, 0, 8 << i, 16 << i, 127, 1); | |
do_test (0, 0, 8 << i, 16 << i, 127, -1); | |
do_test (0, 0, 8 << i, 16 << i, 255, 0); | |
do_test (0, 0, 8 << i, 16 << i, 255, 1); | |
do_test (0, 0, 8 << i, 16 << i, 255, -1); | |
do_test (8 - i, 2 * i, 8 << i, 16 << i, 127, 0); | |
do_test (8 - i, 2 * i, 8 << i, 16 << i, 127, 1); | |
do_test (2 * i, i, 8 << i, 16 << i, 255, 0); | |
do_test (2 * i, i, 8 << i, 16 << i, 255, 1); | |
} | |
do_test_limit (0, 0, 0, 0, 127, 0); | |
do_test_limit (4, 0, 21, 20, 127, 0); | |
do_test_limit (0, 4, 21, 20, 127, 0); | |
do_test_limit (8, 0, 25, 24, 127, 0); | |
do_test_limit (0, 8, 25, 24, 127, 0); | |
for (i = 0; i < 8; ++i) | |
{ | |
do_test_limit (0, 0, 17 - i, 16 - i, 127, 0); | |
do_test_limit (0, 0, 17 - i, 16 - i, 255, 0); | |
do_test_limit (0, 0, 15 - i, 16 - i, 127, 0); | |
do_test_limit (0, 0, 15 - i, 16 - i, 127, 1); | |
do_test_limit (0, 0, 15 - i, 16 - i, 127, -1); | |
do_test_limit (0, 0, 15 - i, 16 - i, 255, 0); | |
do_test_limit (0, 0, 15 - i, 16 - i, 255, 1); | |
do_test_limit (0, 0, 15 - i, 16 - i, 255, -1); | |
} | |
do_random_tests (); | |
return ret; | |
} | |
#include "../test-skeleton.c" |