/*-*- 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/mem/alg.h" #include "libc/intrin/bits.h" #include "libc/dce.h" #include "libc/mem/mem.h" #include "libc/nexgen32e/x86feature.h" #include "libc/runtime/gc.internal.h" #include "libc/str/internal.h" #include "libc/testlib/ezbench.h" #include "libc/testlib/hyperion.h" #include "libc/testlib/testlib.h" #define MAKESTRING(NAME, VALUE) \ char *NAME = strcpy(malloc(sizeof(VALUE) + 16), VALUE) char *strstr_naive(const char *haystack, const char *needle) { size_t i; unsigned k, m; if (haystack == needle || !*needle) return haystack; for (;;) { for (i = 0;; ++i) { if (!needle[i]) return (/*unconst*/ char *)haystack; if (!haystack[i]) break; if (needle[i] != haystack[i]) break; } if (!*haystack++) break; } return 0; } TEST(strstr, test_emptyString_isFoundAtBeginning) { MAKESTRING(haystack, "abc123def"); ASSERT_STREQ(&haystack[0], strstr(haystack, gc(strdup("")))); free(haystack); } TEST(strstr, test_notFound) { MAKESTRING(haystack, "abc123def"); ASSERT_EQ(NULL, strstr(haystack, gc(strdup("xyz")))); free(haystack); } TEST(strstr, test_notFound1) { MAKESTRING(haystack, "abc123def"); ASSERT_EQ(NULL, strstr(haystack, gc(strdup("x")))); free(haystack); } TEST(strstr, test_middleOfString) { MAKESTRING(haystack, "abc123def"); ASSERT_STREQ(&haystack[3], strstr(haystack, gc(strdup("123")))); free(haystack); } TEST(strstr, test_endOfString) { MAKESTRING(haystack, "abc123def"); ASSERT_STREQ(&haystack[8], strstr(haystack, gc(strdup("f")))); free(haystack); } TEST(strstr, test_secondXmmWord) { MAKESTRING(haystack, "eeeeeeeeeeeeeeeebbbbbbbbbbb123"); ASSERT_STREQ(&haystack[27], strstr(haystack, gc(strdup("123")))); free(haystack); } TEST(strstr, test_overlapsXmmWords) { MAKESTRING(haystack, "eeeeeeeeeeeeeeeebbbbbbbbbbbbbbb"); ASSERT_STREQ(&haystack[15], strstr(haystack, gc(strdup("eb")))); free(haystack); } TEST(strstr, test) { ASSERT_EQ(NULL, strstr("x86_64-linux-musl-gcc", "clang")); ASSERT_STREQ("gcc", strstr("x86_64-linux-musl-gcc", "gcc")); ASSERT_EQ(NULL, strstr("-Wl,--gc-sections", "stack-protector")); ASSERT_EQ(NULL, strstr("-Wl,--gc-sections", "sanitize")); ASSERT_STREQ("x", strstr("x", "x")); } TEST(strstr, breakit) { char *p; p = gc(calloc(1, 32)); p[0] = 'c'; p[1] = 'c'; p[10] = 'b'; ASSERT_EQ(NULL, strstr(p, "b")); } /* * memmem naive l: 43,783c 14,142ns m: 31,285c 10,105ns * memmem l: 2,597c 839ns m: 2,612c 844ns * memmem l: 509c 164ns m: 599c 193ns * * strstr naive l: 103,057c 33,287ns m: 47,035c 15,192ns * strstr l: 3,186c 1,029ns m: 3,218c 1,039ns * strstr torture 1 l: 27c 9ns m: 61c 20ns * strstr torture 2 l: 2,322c 750ns m: 2,362c 763ns * strstr torture 4 l: 2,407c 777ns m: 2,448c 791ns * strstr torture 8 l: 2,803c 905ns m: 2,862c 924ns * strstr torture 16 l: 4,559c 1,473ns m: 3,614c 1,167ns * strstr torture 32 l: 5,324c 1,720ns m: 5,577c 1,801ns * * strcasestr naive l: 129,908c 41,959ns m: 155,420c 50,200ns * strcasestr l: 33,464c 10,809ns m: 31,636c 10,218ns * strcasestr tort 1 l: 38c 12ns m: 69c 22ns * strcasestr tort 2 l: 2,544c 822ns m: 2,580c 833ns * strcasestr tort 4 l: 2,745c 887ns m: 2,767c 894ns * strcasestr tort 8 l: 4,198c 1,356ns m: 4,216c 1,362ns * strcasestr tort 16 l: 7,402c 2,391ns m: 7,487c 2,418ns * strcasestr tort 32 l: 13,772c 4,448ns m: 12,945c 4,181ns */ BENCH(strstr, bench) { EZBENCH2("strstr naive", donothing, EXPROPRIATE(strstr_naive(kHyperion, "THE END"))); EZBENCH2("strstr", donothing, EXPROPRIATE(strstr(kHyperion, "THE END"))); EZBENCH2("strstr torture 1", donothing, EXPROPRIATE(strstr( "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaab", "b"))); EZBENCH2("strstr torture 2", donothing, EXPROPRIATE(strstr( "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaab", "ab"))); EZBENCH2("strstr torture 4", donothing, EXPROPRIATE(strstr( "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaab", "aaab"))); EZBENCH2("strstr torture 8", donothing, EXPROPRIATE(strstr( "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaab", "aaaaaaab"))); EZBENCH2("strstr torture 16", donothing, EXPROPRIATE(strstr( "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaab", "aaaaaaaaaaaaaaab"))); EZBENCH2("strstr torture 32", donothing, EXPROPRIATE(strstr( "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaab", "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaab"))); }