/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et 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/mem/mem.h"
#include "libc/stdio/rand.h"
#include "libc/str/str.h"
#include "libc/testlib/ezbench.h"
#include "libc/testlib/hyperion.h"
#include "libc/testlib/testlib.h"
TEST(strchr, blank) {
const char *const blank = "";
EXPECT_EQ(NULL, strchr(blank, '#'));
EXPECT_EQ(blank, strchr(blank, '\0'));
}
TEST(strchr, text) {
char buf[] = "hellothere";
EXPECT_STREQ("there", strchr(buf, 't'));
}
TEST(strchr, testsse) {
char buf[] = "hellohellohellohellohellohellohellohello"
"theretheretheretheretheretheretherethere";
EXPECT_STREQ("theretheretheretheretheretheretherethere", strchr(buf, 't'));
}
TEST(rawmemchr, text) {
char buf[] = "hellothere";
EXPECT_STREQ("there", rawmemchr(buf, 't'));
}
TEST(strchrnul, text) {
char buf[] = "hellothere";
EXPECT_STREQ("there", strchrnul(buf, 't'));
}
TEST(strchr, nulTerminator) {
char buf[] = "hellothere";
EXPECT_STREQ("", strchr(buf, '\0'));
}
TEST(rawmemchr, nulTerminator) {
char buf[] = "hellothere";
EXPECT_STREQ("", rawmemchr(buf, '\0'));
}
TEST(strchrnul, nulTerminator) {
char buf[] = "hellothere";
EXPECT_STREQ("", strchrnul(buf, '\0'));
}
TEST(strchr, notFound_returnsNul) {
char buf[] = "hellothere";
EXPECT_EQ(NULL, strchr(buf, 'z'));
}
TEST(strchrnul, notFound_returnsPointerToNulByte) {
char buf[] = "hi";
EXPECT_STREQ("", strchrnul(buf, 'z'));
EXPECT_EQ(&buf[2], strchrnul(buf, 'z'));
}
char *strchr_pure(const char *s, int c) {
for (c &= 0xff;; ++s) {
if ((*s & 0xff) == c)
return (char *)s;
if (!*s)
return NULL;
}
}
TEST(strchr, fuzz) {
char *p;
int i, j;
p = calloc(1, 64);
for (i = -2; i < 257; ++i) {
for (j = 0; j < 17; ++j) {
rngset(p, 63, rdseed, -1);
ASSERT_EQ(strchr_pure(p + j, i), strchr(p + j, i));
}
}
free(p);
}
BENCH(strchr, bench) {
EZBENCH2("strchr 0", donothing, __expropriate(strchr(__veil("r", ""), 0)));
EZBENCH2("strchr 5", donothing,
__expropriate(strchr(__veil("r", "hello"), 'o')));
EZBENCH2("strchr 8", donothing,
__expropriate(strchr(__veil("r", "hellzzzo"), 'o')));
EZBENCH2("strchr 17", donothing,
__expropriate(strchr(__veil("r", "hellzzzhellzzzeeo"), 'o')));
EZBENCH2("strchr 34", donothing,
__expropriate(
strchr(__veil("r", "hellzzzhellzzzeeAhellzzzhellzzzeeo"), 'o')));
}
char *memchr_pure(const char *m, int c, size_t n) {
const unsigned char *p, *pe;
for (c &= 0xff, p = (const unsigned char *)m, pe = p + n; p < pe; ++p) {
if (*p == c)
return (void *)p;
}
return NULL;
}
TEST(memchr, fuzz) {
char *p;
int i, j;
p = malloc(64);
for (i = -2; i < 257; ++i) {
for (j = 0; j < 17; ++j) {
rngset(p, 64, _rand64, -1);
ASSERT_EQ(memchr(p + j, i, 64 - j), memchr_pure(p + j, i, 64 - j));
}
}
free(p);
}
char *strchrnul_pure(const char *s, int c) {
for (c &= 0xff;; ++s) {
if ((*s & 0xff) == c)
return (char *)s;
if (!*s)
return (void *)s;
}
}
TEST(strchrnul, fuzz) {
char *p;
int i, j;
p = calloc(1, 64);
for (i = -2; i < 257; ++i) {
for (j = 0; j < 17; ++j) {
rngset(p, 63, _rand64, -1);
ASSERT_EQ(strchrnul(p + j, i), strchrnul_pure(p + j, i));
}
}
free(p);
}
void *rawmemchr_pure(const void *m, int c) {
const unsigned char *s;
for (c &= 255, s = m;; ++s) {
if (*s == c)
return (void *)s;
}
}
TEST(rawmemchr, fuzz) {
char *p;
int i, j;
p = malloc(64);
for (i = -2; i < 257; ++i) {
for (j = 0; j < 17; ++j) {
rngset(p, 63, _rand64, -1);
p[63] = i;
ASSERT_EQ(rawmemchr(p + j, i), rawmemchr_pure(p + j, i));
}
}
free(p);
}
/*
* strchr 0 l: 10c 3ns m: 38c 12ns
* strchr 5 l: 13c 4ns m: 42c 14ns
* strchr 8 l: 14c 5ns m: 44c 14ns
* strchr 17 l: 13c 4ns m: 45c 15ns
* strchr 34 l: 16c 5ns m: 48c 16ns
* strchr z l: 369c 119ns m: 408c 132ns
* rawmemchr z l: 236c 76ns m: 391c 126ns
* memchr z l: 357c 115ns m: 423c 137ns
* strchr Z l: 1,872c 605ns m: 1,911c 617ns
* rawmemchr \0 l: 1,184c 382ns m: 1,880c 607ns
* strlen l: 1,174c 379ns m: 1,237c 400ns
* memchr Z l: 1,866c 603ns m: 1,945c 628ns
* strchrnul z l: 365c 118ns m: 408c 132ns
* strchrnul Z l: 1,871c 604ns m: 1,914c 618ns
*/
BENCH(strchr, bench2) {
char *strchr_(const char *, int) asm("strchr");
char *strchrnul_(const char *, int) asm("strchrnul");
char *memchr_(const char *, int, size_t) asm("memchr");
char *strlen_(const char *) asm("strlen");
char *rawmemchr_(const char *, int) asm("rawmemchr");
EZBENCH2("strchr z", donothing, strchr_(kHyperion, 'z'));
EZBENCH2("strchr Z", donothing, strchr_(kHyperion, 'Z'));
EZBENCH2("memchr z", donothing, memchr_(kHyperion, 'z', kHyperionSize));
EZBENCH2("memchr Z", donothing, memchr_(kHyperion, 'Z', kHyperionSize));
EZBENCH2("rawmemchr z", donothing, rawmemchr_(kHyperion, 'z'));
EZBENCH2("rawmemchr Z", donothing, rawmemchr_(kHyperion, 'z'));
EZBENCH2("rawmemchr \\0", donothing, rawmemchr_(kHyperion, 0));
EZBENCH2("strlen", donothing, strlen_(kHyperion));
EZBENCH2("memchr Z", donothing, memchr_(kHyperion, 'Z', kHyperionSize));
EZBENCH2("strchrnul z", donothing, strchrnul_(kHyperion, 'z'));
EZBENCH2("strchrnul Z", donothing, strchrnul_(kHyperion, 'Z'));
}