/*-*- 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 │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/bits.h"
#include "libc/macros.internal.h"
#include "libc/mem/mem.h"
#include "libc/nexgen32e/bsr.h"
#include "libc/nexgen32e/tinystrlen.internal.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"
char u8[] = "utf-8 ☻";
char16_t u16[] = u"utf16 ☻";
wchar_t u32[] = L"utf32 ☻";
TEST(strlen, usageExample_c11) {
_Alignas(16) char ugh[] = "eeeeeeeeeeeeeee\017";
EXPECT_EQ(1, strlen_pure(ugh + 15));
EXPECT_EQ(6 + 3, strlen(u8));
EXPECT_EQ(7, strlen16(u16));
EXPECT_EQ(7, wcslen(u32));
}
TEST(strlen, usageExample_c99) {
EXPECT_EQ(6 + 3, strlen(u8));
EXPECT_EQ(7, strlen16(u16));
EXPECT_EQ(7, wcslen(u32));
}
TEST(strlen, whatMemoryLooksLike) {
EXPECT_BINEQ(u"utf-8 Γÿ╗ ", u8); /* ← thompson-pike encoded */
EXPECT_BINEQ(u"u t f 1 6 ;& ", u16);
EXPECT_BINEQ(u"u t f 3 2 ;& ", u32);
}
TEST(strlen, test_const) {
const char buf[] = "hellothere";
ASSERT_EQ(0, strlen(""));
ASSERT_EQ(0, strnlen("e", 0));
ASSERT_EQ(10, strlen(buf));
}
TEST(strlen, test_nonconst) {
char buf[256];
unsigned i;
for (i = 0; i < 255; ++i) buf[i] = i + 1;
buf[i] = '\0';
ASSERT_EQ(255, strlen(buf));
}
TEST(strnlen, testconst) {
ASSERT_EQ(0, strnlen_s(NULL, 3));
ASSERT_EQ(0, strnlen("", 3));
ASSERT_EQ(0, strnlen("a", 0));
ASSERT_EQ(3, strnlen("123", 3));
ASSERT_EQ(2, strnlen("123", 2));
ASSERT_EQ(3, strnlen("123", 4));
}
TEST(strlen, testnonconst) {
/* this test case is a great example of why we need:
"m"(*(char(*)[0x7fffffff])StR)
rather than:
"m"(*StR) */
char buf[256];
unsigned i;
for (i = 0; i < 250; ++i) buf[i] = i + 1;
buf[i] = '\0';
ASSERT_EQ(250, strlen(buf));
}
TEST(strnlen_s, null_ReturnsZero) {
ASSERT_EQ(0, strnlen_s(NULL, 3));
}
TEST(strnlen, nulNotFound_ReturnsSize) {
int sizes[] = {1, 2, 7, 8, 15, 16, 31, 32, 33};
for (unsigned i = 0; i < ARRAYLEN(sizes); ++i) {
char *buf = malloc(sizes[i]);
memset(buf, ' ', sizes[i]);
ASSERT_EQ(sizes[i], strnlen(buf, sizes[i]), "%d", sizes[i]);
free(buf);
}
}
TEST(strnlen_s, nulNotFound_ReturnsZero) {
char buf[3] = {1, 2, 3};
ASSERT_EQ(0, strnlen_s(buf, 3));
}
TEST(tinystrlen, test) {
ASSERT_EQ(0, tinystrlen(""));
ASSERT_EQ(1, tinystrlen("a"));
ASSERT_EQ(3, tinystrlen("123"));
}
TEST(tinywcslen, test) {
ASSERT_EQ(0, tinywcslen(L""));
ASSERT_EQ(1, tinywcslen(L"a"));
ASSERT_EQ(3, tinywcslen(L"123"));
}
TEST(tinywcsnlen, test) {
EXPECT_EQ(0, tinywcsnlen(L"", 3));
EXPECT_EQ(0, tinywcsnlen(L"a", 0));
EXPECT_EQ(3, tinywcsnlen(L"123", 3));
EXPECT_EQ(2, tinywcsnlen(L"123", 2));
EXPECT_EQ(3, tinywcsnlen(L"123", 4));
}
TEST(tinystrlen16, test) {
ASSERT_EQ(0, tinystrlen16(u""));
ASSERT_EQ(1, tinystrlen16(u"a"));
ASSERT_EQ(3, tinystrlen16(u"123"));
}
TEST(tinystrnlen16, test) {
EXPECT_EQ(0, tinystrnlen16(u"", 3));
EXPECT_EQ(0, tinystrnlen16(u"a", 0));
EXPECT_EQ(3, tinystrnlen16(u"123", 3));
EXPECT_EQ(2, tinystrnlen16(u"123", 2));
EXPECT_EQ(3, tinystrnlen16(u"123", 4));
}
TEST(strlen, fuzz) {
char *b;
size_t n, n1, n2;
for (n = 2; n < 1026; ++n) {
b = rngset(calloc(1, n), n - 1, rand64, -1);
n1 = strlen(b);
n2 = strlen_pure(b);
ASSERT_EQ(n1, n2, "%#.*s", n, b);
n1 = strlen(b + 1);
n2 = strlen_pure(b + 1);
ASSERT_EQ(n1, n2);
free(b);
}
}
BENCH(strlen, bench) {
extern size_t strlen_(const char *) asm("strlen");
extern size_t strlen_pure_(const char *) asm("strlen_pure");
static char b[2048];
static char c[512];
static char d[256];
memset(b, -1, sizeof(b) - 1);
memset(c, -1, sizeof(c) - 1);
memset(d, -1, sizeof(d) - 1);
EZBENCH2("strlen_sse 1", donothing, strlen_(""));
EZBENCH2("strlen_swar 1", donothing, strlen_pure_(""));
EZBENCH2("strlen_sse 2", donothing, strlen_("1"));
EZBENCH2("strlen_swar 2", donothing, strlen_pure_("1"));
EZBENCH2("strlen_sse 3", donothing, strlen_("11"));
EZBENCH2("strlen_swar 3", donothing, strlen_pure_("11"));
EZBENCH2("strlen_sse 4", donothing, strlen_("113"));
EZBENCH2("strlen_swar 4", donothing, strlen_pure_("113"));
EZBENCH2("strlen_sse 7", donothing, strlen_("123456"));
EZBENCH2("strlen_swar 7", donothing, strlen_pure_("123456"));
EZBENCH2("strlen_sse 8", donothing, strlen_("1234567"));
EZBENCH2("strlen_swar 8", donothing, strlen_pure_("1234567"));
EZBENCH2("strlen_sse 9", donothing, strlen_("12345678"));
EZBENCH2("strlen_swar 9", donothing, strlen_pure_("12345678"));
EZBENCH2("strlen_sse 11", donothing, strlen_("12345678aa"));
EZBENCH2("strlen_swar 11", donothing, strlen_pure_("12345678aa"));
EZBENCH2("strlen_sse 13", donothing, strlen_("12345678aabb"));
EZBENCH2("strlen_swar 13", donothing, strlen_pure_("12345678aabb"));
EZBENCH2("strlen_sse 16", donothing, strlen_("123456781234567"));
EZBENCH2("strlen_swar 16", donothing, strlen_pure_("123456781234567"));
EZBENCH2("strlen_sse 17", donothing, strlen_("123456781234567e"));
EZBENCH2("strlen_swar 17", donothing, strlen_pure_("123456781234567e"));
EZBENCH2("strlen_sse 34", donothing,
strlen_("123456781234567e123456781234567ee"));
EZBENCH2("strlen_swar 34", donothing,
strlen_pure_("123456781234567e123456781234567ee"));
EZBENCH2("strlen_sse 68", donothing,
strlen_("123456781234567e123456781234567ee123456781234567e1234567812"
"34567eee"));
EZBENCH2("strlen_swar 68", donothing,
strlen_pure_("123456781234567e123456781234567ee123456781234567e12345"
"6781234567eee"));
EZBENCH2("strlen_sse 256", donothing, strlen_(d));
EZBENCH2("strlen_swar 256", donothing, strlen_pure_(d));
EZBENCH2("strlen_sse 512", donothing, strlen_(c));
EZBENCH2("strlen_swar 512", donothing, strlen_pure_(c));
EZBENCH2("strlen_sse 2048", donothing, strlen_(b));
EZBENCH2("strlen_swar 2048", donothing, strlen_pure_(b));
}