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cosmopolitan/test/libc/str/strcmp_test.c
Justine Tunney f4f4caab0e Add x86_64-linux-gnu emulator 
I wanted a tiny scriptable meltdown proof way to run userspace programs
and visualize how program execution impacts memory. It helps to explain
how things like Actually Portable Executable works. It can show you how
the GCC generated code is going about manipulating matrices and more. I
didn't feel fully comfortable with Qemu and Bochs because I'm not smart
enough to understand them. I wanted something like gVisor but with much
stronger levels of assurances. I wanted a single binary that'll run, on
all major operating systems with an embedded GPL barrier ZIP filesystem
that is tiny enough to transpile to JavaScript and run in browsers too.

https://justine.storage.googleapis.com/emulator625.mp4
2020-08-25 04:43:42 -07:00

589 lines
25 KiB
C
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program 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 │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/bits.h"
#include "libc/dce.h"
#include "libc/macros.h"
#include "libc/nexgen32e/cachesize.h"
#include "libc/nexgen32e/tinystrcmp.h"
#include "libc/nexgen32e/x86feature.h"
#include "libc/rand/rand.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/testlib/ezbench.h"
#include "libc/testlib/testlib.h"
int memcmp$sse2(const void *, const void *, size_t) hidden;
int memcmp$avx2(const void *, const void *, size_t) hidden;
int (*memcmpi)(const void *, const void *, size_t) = memcmp$sse2;
int strcmp$k8(const char *, const char *) hidden;
int strcmp$avx(const char *, const char *) hidden;
int (*strcmpi)(const char *, const char *) = tinystrcmp;
int strncmp$k8(const char *, const char *, size_t) hidden;
int strncmp$avx(const char *, const char *, size_t) hidden;
int (*strncmpi)(const char *, const char *, size_t) = tinystrncmp;
FIXTURE(strcmp, avx) {
if (X86_HAVE(AVX)) {
strcmpi = strcmp$avx;
strncmpi = strncmp$avx;
}
if (X86_HAVE(AVX2)) {
memcmpi = memcmp$avx2;
}
}
/*───────────────────────────────────────────────────────────────────────────│─╗
│ test/libc/str/strcmp_test.c § emptiness ─╬─│┼
╚────────────────────────────────────────────────────────────────────────────│*/
TEST(strcmp, emptyString) {
EXPECT_EQ(0, strcmpi("", ""));
EXPECT_NE(0, strcmpi("", "a"));
}
TEST(strcasecmp, emptyString) {
EXPECT_EQ(0, strcasecmp("", ""));
EXPECT_NE(0, strcasecmp("", "a"));
}
TEST(strcmp16, emptyString) {
EXPECT_EQ(0, strcmp16(u"", u""));
EXPECT_NE(0, strcmp16(u"", u"a"));
}
TEST(strcasecmp16, emptyString) {
EXPECT_EQ(0, strcasecmp16(u"", u""));
EXPECT_NE(0, strcasecmp16(u"", u"a"));
}
TEST(wcscmp, emptyString) {
EXPECT_EQ(0, wcscmp(L"", L""));
EXPECT_NE(0, wcscmp(L"", L"a"));
}
TEST(wcscasecmp, emptyString) {
EXPECT_EQ(0, wcscasecmp(L"", L""));
EXPECT_NE(0, wcscasecmp(L"", L"a"));
}
TEST(strncmp, emptyString) {
char *s1 = strcpy(tmalloc(1), "");
char *s2 = strcpy(tmalloc(1), "");
ASSERT_EQ(0, strncmpi(s1, s2, 0));
ASSERT_EQ(0, strncmpi(s1, s2, 1));
ASSERT_EQ(0, strncmpi(s1, s2, -1));
ASSERT_EQ(0, strncmpi(s1, s1, -1));
ASSERT_EQ(0, strncmpi(s2, s2, -1));
tfree(s2);
tfree(s1);
}
TEST(strncasecmp, emptyString) {
char *s1 = strcpy(tmalloc(1), "");
char *s2 = strcpy(tmalloc(1), "");
ASSERT_EQ(0, strncasecmp(s1, s2, 0));
ASSERT_EQ(0, strncasecmp(s1, s2, 1));
ASSERT_EQ(0, strncasecmp(s1, s2, -1));
ASSERT_EQ(0, strncasecmp(s1, s1, -1));
ASSERT_EQ(0, strncasecmp(s2, s2, -1));
tfree(s2);
tfree(s1);
}
/*───────────────────────────────────────────────────────────────────────────│─╗
│ test/libc/str/strcmp_test.c § inequality ─╬─│┼
╚────────────────────────────────────────────────────────────────────────────│*/
TEST(strncmp, testInequality) {
char *s1 = strcpy(tmalloc(2), "1");
char *s2 = strcpy(tmalloc(1), "");
ASSERT_EQ(0, strncmpi(s1, s2, 0));
ASSERT_EQ('1', strncmpi(s1, s2, 1));
ASSERT_EQ(-'1', strncmpi(s2, s1, 1));
tfree(s2);
tfree(s1);
}
/*───────────────────────────────────────────────────────────────────────────│─╗
│ test/libc/str/strcmp_test.c § does it work? ─╬─│┼
╚────────────────────────────────────────────────────────────────────────────│*/
TEST(memcmp, test) {
EXPECT_EQ(memcmpi("\200", "\200", 1), 0);
EXPECT_LT(memcmpi("\177", "\200", 1), 0);
EXPECT_GT(memcmpi("\200", "\177", 1), 0);
EXPECT_EQ(memcmpi("", "", 0), 0);
EXPECT_EQ(memcmpi("a", "a", 1), 0);
EXPECT_GT(memcmpi("a", "A", 1), 0);
EXPECT_LT(memcmpi("A", "a", 1), 0);
EXPECT_LT(memcmpi("\001", "\377", 1), 0);
EXPECT_GT(memcmpi("\377", "\001", 1), 0);
EXPECT_EQ(memcmpi("a", "aa", 1), 0);
EXPECT_EQ(memcmpi("aa", "a", 1), 0);
EXPECT_LT(memcmpi("a", "aa", 2), 0);
EXPECT_GT(memcmpi("aa", "a", 2), 0);
EXPECT_LT(memcmpi("aaaaaaaaaaaaaaa\001", "aaaaaaaaaaaaaaa\377", 16), 0);
EXPECT_GT(memcmpi("aaaaaaaaaaaaaaa\377", "aaaaaaaaaaaaaaa\001", 16), 0);
EXPECT_LT(memcmpi("aaaaaaaaaaaaaaaa\001", "aaaaaaaaaaaaaaaa\377", 17), 0);
EXPECT_GT(memcmpi("aaaaaaaaaaaaaaaa\377", "aaaaaaaaaaaaaaaa\001", 17), 0);
EXPECT_LT(memcmpi("aaaaaaaaabaaaaaaaaaaaaaaaaaaaaa\001",
"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaa\377", 32),
0);
EXPECT_GT(memcmpi("aaaaaaaaabaaaaaaaaaaaaaaaaaaaaa\377",
"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaa\001", 32),
0);
EXPECT_LT(memcmpi("aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaa\001",
"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaa\377", 33),
0);
EXPECT_GT(memcmpi("aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaa\377",
"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaa\001", 33),
0);
EXPECT_LT(memcmpi("aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\001",
"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\377", 34),
0);
EXPECT_GT(memcmpi("aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\377",
"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\001", 34),
0);
}
TEST(strcmp, testItWorks) {
EXPECT_EQ(strcmpi("", ""), 0);
EXPECT_EQ(strcmpi("a", "a"), 0);
EXPECT_GT(strcmpi("a", "A"), 0);
EXPECT_LT(strcmpi("A", "a"), 0);
EXPECT_LT(strcmpi("\001", "\377"), 0);
EXPECT_GT(strcmpi("\377", "\001"), 0);
EXPECT_LT(strcmpi("a", "aa"), 0);
EXPECT_GT(strcmpi("aa", "a"), 0);
EXPECT_LT(strcmpi("a\000", "aa\000"), 0);
EXPECT_GT(strcmpi("aa\000", "a\000"), 0);
EXPECT_LT(strcmpi("aaaaaaaaaaaaaaa\001", "aaaaaaaaaaaaaaa\377"), 0);
EXPECT_GT(strcmpi("aaaaaaaaaaaaaaa\377", "aaaaaaaaaaaaaaa\001"), 0);
EXPECT_LT(strcmpi("aaaaaaaaaaaaaaaa\001", "aaaaaaaaaaaaaaaa\377"), 0);
EXPECT_GT(strcmpi("aaaaaaaaaaaaaaaa\377", "aaaaaaaaaaaaaaaa\001"), 0);
EXPECT_LT(strcmpi("aaaaaaaaabaaaaaaaaaaaaaaaaaaaaa\001",
"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaa\377"),
0);
EXPECT_GT(strcmpi("aaaaaaaaabaaaaaaaaaaaaaaaaaaaaa\377",
"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaa\001"),
0);
EXPECT_LT(strcmpi("aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaa\001",
"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaa\377"),
0);
EXPECT_GT(strcmpi("aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaa\377",
"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaa\001"),
0);
EXPECT_LT(strcmpi("aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\001",
"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\377"),
0);
EXPECT_GT(strcmpi("aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\377",
"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\001"),
0);
}
TEST(strcasecmp, testItWorks) {
EXPECT_EQ(strcasecmp("", ""), 0);
EXPECT_EQ(strcasecmp("a", "a"), 0);
EXPECT_EQ(strcasecmp("a", "A"), 0);
EXPECT_EQ(strcasecmp("A", "a"), 0);
EXPECT_LT(strcasecmp("a", "z"), 0);
EXPECT_GT(strcasecmp("z", "a"), 0);
EXPECT_LT(strcasecmp("\001", "\377"), 0);
EXPECT_GT(strcasecmp("\377", "\001"), 0);
EXPECT_LT(strcasecmp("a", "aa"), 0);
EXPECT_GT(strcasecmp("aa", "a"), 0);
EXPECT_LT(strcasecmp("a\000", "aa\000"), 0);
EXPECT_GT(strcasecmp("aa\000", "a\000"), 0);
EXPECT_LT(strcasecmp("aaaaaaaaaaaaaaa\001", "aaaaaaaaaaaaaaa\377"), 0);
EXPECT_GT(strcasecmp("aaaaaaaaaaaaaaa\377", "aaaaaaaaaaaaaaa\001"), 0);
EXPECT_LT(strcasecmp("aaaaaaaaaaaaaaaa\001", "aaaaaaaaaaaaaaaa\377"), 0);
EXPECT_GT(strcasecmp("aaaaaaaaaaaaaaaa\377", "aaaaaaaaaaaaaaaa\001"), 0);
EXPECT_LT(strcasecmp("aaaaaaaaabaaaaaaaaaaaaaaaaaaaaa\001",
"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaa\377"),
0);
EXPECT_GT(strcasecmp("aaaaaaaaabaaaaaaaaaaaaaaaaaaaaa\377",
"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaa\001"),
0);
EXPECT_LT(strcasecmp("aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaa\001",
"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaa\377"),
0);
EXPECT_GT(strcasecmp("aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaa\377",
"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaa\001"),
0);
EXPECT_LT(strcasecmp("aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\001",
"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\377"),
0);
EXPECT_GT(strcasecmp("aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\377",
"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\001"),
0);
}
TEST(strcmp16, testItWorks) {
EXPECT_EQ(strcmp16(u"", u""), 0);
EXPECT_EQ(strcmp16(u"a", u"a"), 0);
EXPECT_GT(strcmp16(u"a", u"A"), 0);
EXPECT_LT(strcmp16(u"A", u"a"), 0);
EXPECT_LT(strcmp16(u"\001", u"\377"), 0);
EXPECT_GT(strcmp16(u"\377", u"\001"), 0);
EXPECT_LT(strcmp16(u"a", u"aa"), 0);
EXPECT_GT(strcmp16(u"aa", u"a"), 0);
EXPECT_LT(strcmp16(u"a\000", u"aa\000"), 0);
EXPECT_GT(strcmp16(u"aa\000", u"a\000"), 0);
EXPECT_LT(strcmp16(u"aaaaaaaaaaaaaaa\001", u"aaaaaaaaaaaaaaa\377"), 0);
EXPECT_GT(strcmp16(u"aaaaaaaaaaaaaaa\377", u"aaaaaaaaaaaaaaa\001"), 0);
EXPECT_LT(strcmp16(u"aaaaaaaaaaaaaaaa\001", u"aaaaaaaaaaaaaaaa\377"), 0);
EXPECT_GT(strcmp16(u"aaaaaaaaaaaaaaaa\377", u"aaaaaaaaaaaaaaaa\001"), 0);
EXPECT_LT(strcmp16(u"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaa\001",
u"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaa\377"),
0);
EXPECT_GT(strcmp16(u"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaa\377",
u"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaa\001"),
0);
EXPECT_LT(strcmp16(u"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaa\001",
u"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaa\377"),
0);
EXPECT_GT(strcmp16(u"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaa\377",
u"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaa\001"),
0);
EXPECT_LT(strcmp16(u"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\001",
u"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\377"),
0);
EXPECT_GT(strcmp16(u"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\377",
u"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\001"),
0);
}
TEST(wcscmp, testItWorks) {
EXPECT_EQ(wcscmp(L"", L""), 0);
EXPECT_EQ(wcscmp(L"a", L"a"), 0);
EXPECT_GT(wcscmp(L"a", L"A"), 0);
EXPECT_LT(wcscmp(L"A", L"a"), 0);
EXPECT_LT(wcscmp(L"\001", L"\377"), 0);
EXPECT_GT(wcscmp(L"\377", L"\001"), 0);
EXPECT_LT(wcscmp(L"a", L"aa"), 0);
EXPECT_GT(wcscmp(L"aa", L"a"), 0);
EXPECT_LT(wcscmp(L"a", L"aa"), 0);
EXPECT_GT(wcscmp(L"aa", L"a"), 0);
EXPECT_LT(wcscmp(L"aaaaaaaaaaaaaaa\001", L"aaaaaaaaaaaaaaa\377"), 0);
EXPECT_GT(wcscmp(L"aaaaaaaaaaaaaaa\377", L"aaaaaaaaaaaaaaa\001"), 0);
EXPECT_LT(wcscmp(L"aaaaaaaaaaaaaaaa\001", L"aaaaaaaaaaaaaaaa\377"), 0);
EXPECT_GT(wcscmp(L"aaaaaaaaaaaaaaaa\377", L"aaaaaaaaaaaaaaaa\001"), 0);
EXPECT_LT(wcscmp(L"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaa\001",
L"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaa\377"),
0);
EXPECT_GT(wcscmp(L"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaa\377",
L"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaa\001"),
0);
EXPECT_LT(wcscmp(L"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaa\001",
L"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaa\377"),
0);
EXPECT_GT(wcscmp(L"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaa\377",
L"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaa\001"),
0);
EXPECT_LT(wcscmp(L"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\001",
L"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\377"),
0);
EXPECT_GT(wcscmp(L"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\377",
L"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\001"),
0);
}
TEST(strcasecmp, testItWorksCase) {
EXPECT_EQ(0, strcasecmp("hello", "HELLO"));
EXPECT_EQ(0, strcasecmp("hello", "Hello"));
EXPECT_EQ(0, strcasecmp("hello", "hello"));
EXPECT_NE(0, strcasecmp("hello", "yello"));
}
TEST(strcasecmp16, testItWorksCase) {
EXPECT_EQ(0, strcasecmp16(u"hello", u"HELLO"));
EXPECT_EQ(0, strcasecmp16(u"hello", u"Hello"));
EXPECT_EQ(0, strcasecmp16(u"hello", u"hello"));
EXPECT_NE(0, strcasecmp16(u"hello", u"yello"));
}
TEST(wcscasecmp, testItWorksCase) {
EXPECT_EQ(0, wcscasecmp(L"hello", L"HELLO"));
EXPECT_EQ(0, wcscasecmp(L"hello", L"Hello"));
EXPECT_EQ(0, wcscasecmp(L"hello", L"hello"));
EXPECT_NE(0, wcscasecmp(L"hello", L"yello"));
}
TEST(strcasecmp8to16, testItWorksCase) {
EXPECT_EQ(0, strcasecmp8to16("hello", u"HELLO"));
EXPECT_EQ(0, strcasecmp8to16("hello", u"Hello"));
EXPECT_EQ(0, strcasecmp8to16("hello", u"hello"));
EXPECT_NE(0, strcasecmp8to16("hello", u"yello"));
}
/*───────────────────────────────────────────────────────────────────────────│─╗
│ test/libc/str/strcmp_test.c § nontrivial length ─╬─│┼
╚────────────────────────────────────────────────────────────────────────────│*/
TEST(strncmp, testEqualManyNs) {
char *s1 = tmalloc(PAGESIZE);
char *s2 = tmalloc(PAGESIZE);
memset(s1, 7, PAGESIZE);
memset(s2, 7, PAGESIZE);
s1[PAGESIZE - 1] = '\0';
s2[PAGESIZE - 1] = '\0';
for (unsigned i = 1; i <= 128; ++i) {
ASSERT_EQ(0, strncmpi(s1 + PAGESIZE - i, s2 + PAGESIZE - i, i + 0));
ASSERT_EQ(0, strncmpi(s1 + PAGESIZE - i, s2 + PAGESIZE - i, i + 1));
}
tfree(s2);
tfree(s1);
}
TEST(strncmp, testNotEqualManyNs) {
char *s1 = tmalloc(PAGESIZE);
char *s2 = tmalloc(PAGESIZE);
for (unsigned i = 1; i <= 128; ++i) {
memset(s1, 7, PAGESIZE);
memset(s2, 7, PAGESIZE);
s1[PAGESIZE - 1] = (unsigned char)0;
s2[PAGESIZE - 1] = (unsigned char)255;
ASSERT_EQ(-255, strncmpi(s1 + PAGESIZE - i, s2 + PAGESIZE - i, i + 0));
ASSERT_EQ(-255, strncmpi(s1 + PAGESIZE - i, s2 + PAGESIZE - i, i + 1));
}
tfree(s2);
tfree(s1);
}
/*───────────────────────────────────────────────────────────────────────────│─╗
│ test/libc/str/strcmp_test.c § nul termination vs. explicit length ─╬─│┼
╚────────────────────────────────────────────────────────────────────────────│*/
TEST(strncmp, testStringNulTerminatesBeforeExplicitLength) {
const char kRdi[] = "";
const char kRsi[] = "TZ=America/Los_Angeles";
char *rdi = memcpy(tmalloc(sizeof(kRdi)), kRdi, sizeof(kRdi));
char *rsi = memcpy(tmalloc(sizeof(kRsi)), kRsi, sizeof(kRsi));
size_t rdx = 3;
EXPECT_EQ(strncmpi(rdi, rdi, rdx), 0);
EXPECT_LT(strncmpi(rdi, rsi, rdx), 0);
EXPECT_GT(strncmpi(rsi, rdi, rdx), 0);
tfree(rsi);
tfree(rdi);
}
TEST(strncasecmp, testStringNulTerminatesBeforeExplicitLength) {
const char kRdi[] = "";
const char kRsi[] = "TZ=America/Los_Angeles";
char *rdi = memcpy(tmalloc(sizeof(kRdi)), kRdi, sizeof(kRdi));
char *rsi = memcpy(tmalloc(sizeof(kRsi)), kRsi, sizeof(kRsi));
size_t rdx = 3;
EXPECT_EQ(strncasecmp(rdi, rdi, rdx), 0);
EXPECT_LT(strncasecmp(rdi, rsi, rdx), 0);
EXPECT_GT(strncasecmp(rsi, rdi, rdx), 0);
tfree(rsi);
tfree(rdi);
}
TEST(strncmp16, testStringNulTerminatesBeforeExplicitLength) {
const char16_t kRdi[] = u"";
const char16_t kRsi[] = u"TZ=America/Los_Angeles";
char16_t *rdi = memcpy(tmalloc(sizeof(kRdi)), kRdi, sizeof(kRdi));
char16_t *rsi = memcpy(tmalloc(sizeof(kRsi)), kRsi, sizeof(kRsi));
size_t rdx = 3;
EXPECT_EQ(strncmp16(rdi, rdi, rdx), 0);
EXPECT_LT(strncmp16(rdi, rsi, rdx), 0);
EXPECT_GT(strncmp16(rsi, rdi, rdx), 0);
tfree(rsi);
tfree(rdi);
}
/*───────────────────────────────────────────────────────────────────────────│─╗
│ test/libc/str/strcmp_test.c § two's complement bane ─╬─│┼
╚────────────────────────────────────────────────────────────────────────────│*/
TEST(strcmp, testTwosComplementBane_hasUnsignedBehavior) {
EXPECT_EQ(strcmpi("\200", "\200"), 0);
EXPECT_LT(strcmpi("\x7f", "\x80"), 0);
EXPECT_GT(strcmpi("\x80", "\x7f"), 0);
}
TEST(strcasecmp, testTwosComplementBane_hasUnsignedBehavior) {
EXPECT_EQ(strcasecmp("\200", "\200"), 0);
EXPECT_LT(strcasecmp("\x7f", "\x80"), 0);
EXPECT_GT(strcasecmp("\x80", "\x7f"), 0);
}
TEST(memcmp, testTwosComplementBane_unsignedBehavior) {
EXPECT_EQ(memcmpi("\200", "\200", 1), 0);
EXPECT_LT(memcmpi("\177", "\200", 1), 0);
EXPECT_GT(memcmpi("\200", "\177", 1), 0);
EXPECT_EQ(memcmpi("aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\200",
"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\200", 34),
0);
EXPECT_LT(memcmpi("aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\177",
"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\200", 34),
0);
EXPECT_GT(memcmpi("aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\200",
"aaaaaaaaabaaaaaaaaaaaaaaaaaaaaaaa\177", 34),
0);
}
TEST(strcmp16, testTwosComplementBane_hasUnsignedBehavior) {
char16_t *B1 = tmalloc(8);
char16_t *B2 = tmalloc(8);
B1[1] = L'\0';
B2[1] = L'\0';
EXPECT_EQ(strcmp16(memcpy(B1, "\x00\x80", 2), memcpy(B2, "\x00\x80", 2)), 0);
EXPECT_LT(strcmp16(memcpy(B1, "\xff\x7f", 2), memcpy(B2, "\x00\x80", 2)), 0);
EXPECT_GT(strcmp16(memcpy(B1, "\x00\x80", 2), memcpy(B2, "\xff\x7f", 2)), 0);
tfree(B2);
tfree(B1);
}
TEST(strncmp16, testTwosComplementBane_hasUnsignedBehavior) {
char16_t *B1 = tmalloc(4);
char16_t *B2 = tmalloc(4);
EXPECT_EQ(strncmp16(memcpy(B1, "\x00\x80", 2), memcpy(B2, "\x00\x80", 2), 1),
0);
EXPECT_LT(strncmp16(memcpy(B1, "\xff\x7f", 2), memcpy(B2, "\x00\x80", 2), 1),
0);
EXPECT_GT(strncmp16(memcpy(B1, "\x00\x80", 2), memcpy(B2, "\xff\x7f", 2), 1),
0);
tfree(B2);
tfree(B1);
}
TEST(wcscmp, testTwosComplementBane_hasSignedBehavior) {
wchar_t *B1 = tmalloc(8);
wchar_t *B2 = tmalloc(8);
B1[1] = L'\0';
B2[1] = L'\0';
EXPECT_EQ(wcscmp(memcpy(B1, "\x00\x00\x00\x80", 4),
memcpy(B2, "\x00\x00\x00\x80", 4)),
0);
EXPECT_GT(wcscmp(memcpy(B1, "\xff\xff\xff\x7f", 4),
memcpy(B2, "\x00\x00\x00\x80", 4)),
0);
EXPECT_LT(wcscmp(memcpy(B1, "\x00\x00\x00\x80", 4),
memcpy(B2, "\xff\xff\xff\x7f", 4)),
0);
tfree(B2);
tfree(B1);
}
TEST(wcsncmp, testTwosComplementBane_hasSignedBehavior) {
wchar_t *B1 = tmalloc(4);
wchar_t *B2 = tmalloc(4);
EXPECT_EQ(wcsncmp(memcpy(B1, "\x00\x00\x00\x80", 4),
memcpy(B2, "\x00\x00\x00\x80", 4), 1),
0);
EXPECT_GT(wcsncmp(memcpy(B1, "\xff\xff\xff\x7f", 4),
memcpy(B2, "\x00\x00\x00\x80", 4), 1),
0);
EXPECT_LT(wcsncmp(memcpy(B1, "\x00\x00\x00\x80", 4),
memcpy(B2, "\xff\xff\xff\x7f", 4), 1),
0);
tfree(B2);
tfree(B1);
}
/*───────────────────────────────────────────────────────────────────────────│─╗
│ test/libc/str/strcmp_test.c § benchmarks ─╬─│┼
╚────────────────────────────────────────────────────────────────────────────│*/
testonly noinline int strcmp$pure(const char *a, const char *b) {
for (; *a == *b; a++, b++) {
if (!*a) break;
}
return (*a & 0xff) - (*b & 0xff);
}
testonly noinline int strcasecmp$pure(const char *a, const char *b) {
for (; *a && *b; a++, b++) {
if (!(*a == *b || tolower(*a & 0xff) == tolower(*b & 0xff))) {
break;
}
}
return tolower(*a & 0xff) - tolower(*b & 0xff);
}
char *randomize_buf2str(size_t size, char data[size]) {
rngset(data, size, rand64, -1);
data[size - 1] = '\0';
return data;
}
char *longstringislong(size_t size, char data[size]) {
unsigned i;
randomize_buf2str(size, data);
for (i = 0; i < size; ++i) {
data[i] |= 1u << (i & 5);
}
data[size - 1] = '\0';
return data;
}
void randomize_buf2str_dupe(size_t size, char data[size], char dupe[size]) {
randomize_buf2str(size, data);
memcpy(dupe, data, size);
}
void longstringislong_dupe(size_t size, char data[size], char dupe[size]) {
longstringislong(size, data);
memcpy(dupe, data, size);
}
BENCH(bench_00_strcmp, bench) {
size_t size;
char *dupe, *data;
size = ROUNDDOWN(MAX(FRAMESIZE, getcachesize(kCpuCacheTypeData, 1)) / 2,
PAGESIZE);
data = tgc(tmalloc(size));
dupe = tgc(tmalloc(size));
EZBENCH2("strcmp [identity]", longstringislong(size, data),
EXPROPRIATE(strcmp(VEIL("r", data), data)));
EZBENCH2("strcmp [short dupe]", randomize_buf2str_dupe(size, data, dupe),
EXPROPRIATE(strcmp(VEIL("r", data), VEIL("r", dupe))));
EZBENCH2("strcmp$pure [short dupe]", randomize_buf2str_dupe(size, data, dupe),
EXPROPRIATE(strcmp$pure(VEIL("r", data), VEIL("r", dupe))));
EZBENCH2("strcmp [long dupe]", longstringislong_dupe(size, data, dupe),
EXPROPRIATE(strcmp(VEIL("r", data), VEIL("r", dupe))));
EZBENCH2("strcmp$pure [long dupe]", longstringislong_dupe(size, data, dupe),
EXPROPRIATE(strcmp$pure(VEIL("r", data), VEIL("r", dupe))));
}
BENCH(bench_01_strcasecmp, bench) {
size_t size;
char *dupe, *data;
size = ROUNDDOWN(MAX(FRAMESIZE, getcachesize(kCpuCacheTypeData, 1)) / 2,
PAGESIZE);
data = tgc(tmalloc(size));
dupe = tgc(tmalloc(size));
EZBENCH2("strcasecmp [identity]", longstringislong(size, data),
EXPROPRIATE(strcasecmp(VEIL("r", data), data)));
EZBENCH2("strcasecmp [short dupe]", randomize_buf2str_dupe(size, data, dupe),
EXPROPRIATE(strcasecmp(VEIL("r", data), VEIL("r", dupe))));
EZBENCH2("strcasecmp$pure [short dupe]",
randomize_buf2str_dupe(size, data, dupe),
EXPROPRIATE(strcasecmp$pure(VEIL("r", data), VEIL("r", dupe))));
EZBENCH2("strcasecmp [long dupe]", longstringislong_dupe(size, data, dupe),
EXPROPRIATE(strcasecmp(VEIL("r", data), VEIL("r", dupe))));
EZBENCH2("strcasecmp$pure [long dupe]",
longstringislong_dupe(size, data, dupe),
EXPROPRIATE(strcasecmp$pure(VEIL("r", data), VEIL("r", dupe))));
}
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