mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-01 03:53:33 +00:00
f531acc8f9
- Invent openatemp() API - Invent O_UNLINK open flag - Introduce getenv_secure() API - Remove `git pull` from cosmocc - Fix utimes() when path is NULL - Fix mktemp() to never return NULL - Fix utimensat() UTIME_OMIT on XNU - Improve utimensat() code for RHEL5 - Turn `argv[0]` C:/ to /C/ on Windows - Introduce tmpnam() and tmpnam_r() APIs - Fix more const issues with internal APIs - Permit utimes() on WIN32 in O_RDONLY mode - Fix fdopendir() to check fd is a directory - Fix recent crash regression in landlock make - Fix futimens(AT_FDCWD, NULL) to return EBADF - Use workaround so `make -j` doesn't fork bomb - Rename dontdiscard to __wur (just like glibc) - Fix st_size for WIN32 symlinks containing UTF-8 - Introduce stdio ext APIs needed by GNU coreutils - Fix lstat() on WIN32 for symlinks to directories - Move some constants from normalize.inc to limits.h - Fix segv with memchr() and memcmp() overlapping page - Implement POSIX fflush() behavior for reader streams - Implement AT_SYMLINK_NOFOLLOW for utimensat() on WIN32 - Don't change read-only status of existing files on WIN32 - Correctly handle `0x[^[:xdigit:]]` case in strtol() functions
298 lines
12 KiB
C
298 lines
12 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/mem/gc.internal.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/sysconf.h"
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#include "libc/stdio/rand.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/testlib/ezbench.h"
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#include "libc/testlib/fastrandomstring.h"
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#include "libc/testlib/hyperion.h"
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#include "libc/testlib/testlib.h"
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int golden(const void *p, const void *q, size_t n) {
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int c;
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size_t i;
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for (i = 0; i < n; ++i) {
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if ((c = ((const unsigned char *)p)[i] - ((const unsigned char *)q)[i])) {
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return c;
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}
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}
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return 0;
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}
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TEST(memcmp, test) {
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EXPECT_EQ(0, memcmp("hi", "hi", 2));
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EXPECT_NE(0, memcmp("hi", "HI", 2));
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EXPECT_EQ(-1, memcmp("a", "b", 1));
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EXPECT_EQ(+1, memcmp("b", "a", 1));
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}
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TEST(memcmp, hug) {
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int i, j, g;
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char a[128] = {0};
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char b[128] = {0};
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for (j = 0; j < 128; ++j) {
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for (i = 0; i < j; ++i) {
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a[i] = 1;
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g = golden(a, b, j);
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ASSERT_EQ(g, memcmp(a, b, j), "i=%d j=%d", i, j);
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ASSERT_EQ(!!g, !!bcmp(a, b, j), "i=%d j=%d", i, j);
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ASSERT_EQ(!!g, !!timingsafe_bcmp(a, b, j), "i=%d", i);
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ASSERT_EQ(MAX(-1, MIN(1, g)), timingsafe_memcmp(a, b, j), "i=%d", i);
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a[i] = 0;
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}
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}
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}
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static int coerce(int result) {
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#ifdef __aarch64__
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// arm's strcmp assembly is nuts and unpredictable, but it's legal
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if (result < 0) return -1;
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if (result > 0) return +1;
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return 0;
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#else
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return result;
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#endif
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}
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TEST(memcmp, fuzz) {
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int i, o, n, g;
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char a[256], b[256];
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for (i = 0; i < 100000; ++i) {
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rngset(a, sizeof(a), _rand64, -1);
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memcpy(b, a, sizeof(a));
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if (rand() & 1) {
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a[rand() % sizeof(a)] += rand();
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} else {
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b[rand() % sizeof(a)] += rand();
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}
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if (rand() & 1) {
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a[rand() % sizeof(a)] += rand();
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} else {
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b[rand() % sizeof(a)] += rand();
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}
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o = rand() & 31;
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n = rand() % (sizeof(a) - o);
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g = coerce(golden(a + o, b + o, n));
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#if 0
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if (memcmp(a + o, b + o, n) != g) {
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kprintf("const size_t g = %d;\n", g);
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kprintf("const size_t n = %d;\n", n);
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kprintf("const char a[] = unbingstr(%#.*hhhs); /* %p */\n", n, a + o,
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a + o);
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kprintf("const char b[] = unbingstr(%#.*hhhs); /* %p */\n", n, b + o,
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b + o);
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}
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#endif
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ASSERT_EQ(g, coerce(memcmp(a + o, b + o, n)), "n=%d o=%d", n, o);
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ASSERT_EQ(!!g, !!bcmp(a + o, b + o, n), "n=%d o=%d", n, o);
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ASSERT_EQ(!!g, !!timingsafe_bcmp(a + o, b + o, n), "n=%d o=%d", n, o);
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ASSERT_EQ(MAX(-1, MIN(1, g)), timingsafe_memcmp(a + o, b + o, n),
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"n=%d o=%d", n, o);
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}
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}
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TEST(memcmp, pageOverlapTorture) {
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long pagesz = sysconf(_SC_PAGESIZE);
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char *map = mmap(0, pagesz * 2, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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char *map2 = mmap(0, pagesz * 2, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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ASSERT_SYS(0, 0, mprotect(map + pagesz, pagesz, PROT_NONE));
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ASSERT_SYS(0, 0, mprotect(map2 + pagesz, pagesz, PROT_NONE));
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strcpy(map + pagesz - 9, "12345678");
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strcpy(map2 + pagesz - 9, "12345679");
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EXPECT_LT(memcmp(map + pagesz - 9, map2 + pagesz - 9, 79), 0);
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EXPECT_SYS(0, 0, munmap(map2, pagesz * 2));
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EXPECT_SYS(0, 0, munmap(map, pagesz * 2));
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}
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int buncmp(const void *, const void *, size_t) asm("bcmp");
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int funcmp(const void *, const void *, size_t) asm("memcmp");
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#if 1
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BENCH(memcmp, bench) {
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char *volatile a;
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char *volatile b;
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b = a = "123456789123456789123456789123456789123456789123456789";
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b = gc(strdup(b));
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EZBENCH_N("memcmp", 0, __expropriate(funcmp(a, b, 0)));
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EZBENCH_N("memcmp", 1, __expropriate(funcmp(a, b, 1)));
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EZBENCH_N("memcmp", 2, __expropriate(funcmp(a, b, 2)));
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EZBENCH_N("memcmp", 3, __expropriate(funcmp(a, b, 3)));
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EZBENCH_N("𝗺𝗲𝗺𝗰𝗺𝗽", 4, __expropriate(funcmp(a, b, 4)));
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EZBENCH_N("memcmp", 5, __expropriate(funcmp(a, b, 5)));
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EZBENCH_N("memcmp", 6, __expropriate(funcmp(a, b, 6)));
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EZBENCH_N("memcmp", 7, __expropriate(funcmp(a, b, 7)));
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EZBENCH_N("𝗺𝗲𝗺𝗰𝗺𝗽", 8, __expropriate(funcmp(a, b, 8)));
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EZBENCH_N("memcmp", 9, __expropriate(funcmp(a, b, 9)));
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EZBENCH_N("memcmp", 15, __expropriate(funcmp(a, b, 15)));
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EZBENCH_N("𝗺𝗲𝗺𝗰𝗺𝗽", 16, __expropriate(funcmp(a, b, 16)));
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EZBENCH_N("memcmp", 17, __expropriate(funcmp(a, b, 17)));
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EZBENCH_N("memcmp", 31, __expropriate(funcmp(a, b, 31)));
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EZBENCH_N("memcmp", 32, __expropriate(funcmp(a, b, 32)));
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a = kHyperion;
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b = gc(strdup(kHyperion));
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EZBENCH_N("memcmp", 33, __expropriate(funcmp(a, b, 33)));
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EZBENCH_N("memcmp", 79, __expropriate(funcmp(a, b, 79)));
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EZBENCH_N("𝗺𝗲𝗺𝗰𝗺𝗽", 80, __expropriate(funcmp(a, b, 80)));
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EZBENCH_N("memcmp", 128, __expropriate(funcmp(a, b, 128)));
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EZBENCH_N("memcmp", 256, __expropriate(funcmp(a, b, 256)));
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a = gc(malloc(16 * 1024));
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b = gc(malloc(16 * 1024));
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rngset(a, 16 * 1024, lemur64, -1);
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memcpy(b, a, 16 * 1024);
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EZBENCH_N("memcmp", 16384, __expropriate(funcmp(a, b, 16384)));
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a = gc(malloc(32 * 1024));
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b = gc(malloc(32 * 1024));
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rngset(a, 32 * 1024, lemur64, -1);
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memcpy(b, a, 32 * 1024);
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EZBENCH_N("memcmp", 32768, __expropriate(funcmp(a, b, 32768)));
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a = gc(malloc(128 * 1024));
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b = gc(malloc(128 * 1024));
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rngset(a, 128 * 1024, lemur64, -1);
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memcpy(b, a, 128 * 1024);
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EZBENCH_N("memcmp", 131072, __expropriate(funcmp(a, b, 131072)));
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}
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#endif
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#if 0
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BENCH(timingsafe_memcmp, bench) {
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volatile int v;
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const char *volatile a;
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const char *volatile b;
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b = a = "123456789123456789123456789123456789123456789123456789";
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b = gc(strdup(b));
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EZBENCH_N("timingsafe_memcmp", 0, v = timingsafe_memcmp(a, b, 0));
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EZBENCH_N("timingsafe_memcmp", 1, v = timingsafe_memcmp(a, b, 1));
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EZBENCH_N("timingsafe_memcmp", 2, v = timingsafe_memcmp(a, b, 2));
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EZBENCH_N("timingsafe_memcmp", 3, v = timingsafe_memcmp(a, b, 3));
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EZBENCH_N("𝘁𝗶𝗺𝗶𝗻𝗴𝘀𝗮𝗳𝗲_𝗺𝗲𝗺𝗰𝗺𝗽", 4, v = timingsafe_memcmp(a, b, 4));
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EZBENCH_N("timingsafe_memcmp", 5, v = timingsafe_memcmp(a, b, 5));
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EZBENCH_N("timingsafe_memcmp", 6, v = timingsafe_memcmp(a, b, 6));
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EZBENCH_N("timingsafe_memcmp", 7, v = timingsafe_memcmp(a, b, 7));
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EZBENCH_N("𝘁𝗶𝗺𝗶𝗻𝗴𝘀𝗮𝗳𝗲_𝗺𝗲𝗺𝗰𝗺𝗽", 8, v = timingsafe_memcmp(a, b, 8));
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EZBENCH_N("timingsafe_memcmp", 9, v = timingsafe_memcmp(a, b, 9));
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EZBENCH_N("timingsafe_memcmp", 15, v = timingsafe_memcmp(a, b, 15));
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EZBENCH_N("𝘁𝗶𝗺𝗶𝗻𝗴𝘀𝗮𝗳𝗲_𝗺𝗲𝗺𝗰𝗺𝗽", 16, v = timingsafe_memcmp(a, b, 16));
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EZBENCH_N("timingsafe_memcmp", 17, v = timingsafe_memcmp(a, b, 17));
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EZBENCH_N("timingsafe_memcmp", 31, v = timingsafe_memcmp(a, b, 31));
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EZBENCH_N("timingsafe_memcmp", 32, v = timingsafe_memcmp(a, b, 32));
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a = kHyperion;
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b = gc(strdup(kHyperion));
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EZBENCH_N("timingsafe_memcmp", 33, v = timingsafe_memcmp(a, b, 33));
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EZBENCH_N("timingsafe_memcmp", 79, v = timingsafe_memcmp(a, b, 79));
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EZBENCH_N("𝘁𝗶𝗺𝗶𝗻𝗴𝘀𝗮𝗳𝗲_𝗺𝗲𝗺𝗰𝗺𝗽", 80, v = timingsafe_memcmp(a, b, 80));
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EZBENCH_N("timingsafe_memcmp", 128, v = timingsafe_memcmp(a, b, 128));
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EZBENCH_N("timingsafe_memcmp", 256, v = timingsafe_memcmp(a, b, 256));
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a = gc(malloc(16 * 1024));
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b = gc(malloc(16 * 1024));
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rngset(a, 16 * 1024, lemur64, -1);
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memcpy(b, a, 16 * 1024);
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EZBENCH_N("timingsafe_memcmp", 16384, v = timingsafe_memcmp(a, b, 16384));
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a = gc(malloc(32 * 1024));
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b = gc(malloc(32 * 1024));
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rngset(a, 32 * 1024, lemur64, -1);
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memcpy(b, a, 32 * 1024);
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EZBENCH_N("timingsafe_memcmp", 32768, v = timingsafe_memcmp(a, b, 32768));
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a = gc(malloc(128 * 1024));
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b = gc(malloc(128 * 1024));
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rngset(a, 128 * 1024, lemur64, -1);
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memcpy(b, a, 128 * 1024);
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EZBENCH_N("timingsafe_memcmp", 131072, v = timingsafe_memcmp(a, b, 131072));
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}
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#endif
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#if 0
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BENCH(memcasecmp, bench) {
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volatile int v;
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const char *volatile a;
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const char *volatile b;
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b = a = "123456789123456789123456789123456789123456789123456789";
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b = gc(strdup(b));
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EZBENCH_N("memcasecmp", 0, v = memcasecmp(a, b, 0));
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EZBENCH_N("memcasecmp", 1, v = memcasecmp(a, b, 1));
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EZBENCH_N("memcasecmp", 2, v = memcasecmp(a, b, 2));
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EZBENCH_N("memcasecmp", 3, v = memcasecmp(a, b, 3));
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EZBENCH_N("𝗺𝗲𝗺𝗰𝗮𝘀𝗲𝗰𝗺𝗽", 4, v = memcasecmp(a, b, 4));
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EZBENCH_N("memcasecmp", 5, v = memcasecmp(a, b, 5));
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EZBENCH_N("memcasecmp", 6, v = memcasecmp(a, b, 6));
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EZBENCH_N("memcasecmp", 7, v = memcasecmp(a, b, 7));
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EZBENCH_N("𝗺𝗲𝗺𝗰𝗮𝘀𝗲𝗰𝗺𝗽", 8, v = memcasecmp(a, b, 8));
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EZBENCH_N("memcasecmp", 9, v = memcasecmp(a, b, 9));
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EZBENCH_N("memcasecmp", 15, v = memcasecmp(a, b, 15));
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EZBENCH_N("𝗺𝗲𝗺𝗰𝗮𝘀𝗲𝗰𝗺𝗽", 16, v = memcasecmp(a, b, 16));
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EZBENCH_N("memcasecmp", 17, v = memcasecmp(a, b, 17));
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EZBENCH_N("memcasecmp", 31, v = memcasecmp(a, b, 31));
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EZBENCH_N("memcasecmp", 32, v = memcasecmp(a, b, 32));
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a = kHyperion;
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b = gc(strdup(kHyperion));
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EZBENCH_N("memcasecmp", 33, v = memcasecmp(a, b, 33));
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EZBENCH_N("memcasecmp", 79, v = memcasecmp(a, b, 79));
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EZBENCH_N("𝗺𝗲𝗺𝗰𝗮𝘀𝗲𝗰𝗺𝗽", 80, v = memcasecmp(a, b, 80));
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EZBENCH_N("memcasecmp", 128, v = memcasecmp(a, b, 128));
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EZBENCH_N("memcasecmp", 256, v = memcasecmp(a, b, 256));
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a = gc(malloc(16 * 1024));
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b = gc(malloc(16 * 1024));
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rngset(a, 16 * 1024, lemur64, -1);
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memcpy(b, a, 16 * 1024);
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EZBENCH_N("memcasecmp", 16384, v = memcasecmp(a, b, 16384));
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a = gc(malloc(32 * 1024));
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b = gc(malloc(32 * 1024));
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rngset(a, 32 * 1024, lemur64, -1);
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memcpy(b, a, 32 * 1024);
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EZBENCH_N("memcasecmp", 32768, v = memcasecmp(a, b, 32768));
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a = gc(malloc(128 * 1024));
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b = gc(malloc(128 * 1024));
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rngset(a, 128 * 1024, lemur64, -1);
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memcpy(b, a, 128 * 1024);
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EZBENCH_N("memcasecmp", 131072, v = memcasecmp(a, b, 131072));
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}
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#endif
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#if 0
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BENCH(timingsafe_memcmp, demonstration) {
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int bcmp_(const void *, const void *, size_t) asm("bcmp");
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int memcmp_(const void *, const void *, size_t) asm("memcmp");
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char a[256], b[256];
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rngset(a, 256, lemur64, -1);
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memcpy(b, a, 256);
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++a[0];
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EZBENCH_N("bcmp ne", 256, bcmp_(a, b, 256));
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a[0] = b[0];
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EZBENCH_N("bcmp eq", 256, bcmp_(a, b, 256));
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++a[0];
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EZBENCH_N("memcmp ne", 256, memcmp_(a, b, 256));
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a[0] = b[0];
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EZBENCH_N("memcmp eq", 256, memcmp_(a, b, 256));
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++a[0];
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EZBENCH_N("timingsafe_bcmp ne", 256, timingsafe_bcmp(a, b, 256));
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a[0] = b[0];
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EZBENCH_N("timingsafe_bcmp eq", 256, timingsafe_bcmp(a, b, 256));
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++a[0];
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EZBENCH_N("timingsafe_memcmp ne", 256, timingsafe_memcmp(a, b, 256));
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a[0] = b[0];
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EZBENCH_N("timingsafe_memcmp eq", 256, timingsafe_memcmp(a, b, 256));
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}
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#endif
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