mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-12 17:27:56 +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
84 lines
3.4 KiB
C
84 lines
3.4 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/dce.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/limits.h"
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#include "libc/nexgen32e/x86feature.h"
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#include "libc/stdckdint.h"
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#include "libc/str/str.h"
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typedef wchar_t xmm_t __attribute__((__vector_size__(16), __aligned__(4)));
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static inline const wchar_t *wmemrchr_pure(const wchar_t *s, wchar_t c,
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size_t n) {
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size_t i;
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for (i = n; i--;) {
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if (s[i] == c) {
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return s + i;
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}
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}
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return 0;
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}
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#if defined(__x86_64__) && !defined(__chibicc__)
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dontasan static inline const wchar_t *wmemrchr_sse(const wchar_t *s, wchar_t c,
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size_t n) {
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size_t i;
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unsigned m;
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xmm_t v, t = {c, c, c, c};
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for (i = n; i >= 4;) {
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v = *(const xmm_t *)(s + (i -= 4));
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m = __builtin_ia32_pmovmskb128(v == t);
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if (m) {
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m = __builtin_clzl(m) ^ (sizeof(long) * CHAR_BIT - 1);
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return s + i + m / 4;
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}
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}
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while (i--) {
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if (s[i] == c) {
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return s + i;
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}
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}
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return 0;
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}
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#endif
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/**
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* Returns pointer to first instance of character.
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*
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* @param s is memory to search
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* @param c is search word
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* @param n is number of wchar_t elements in `s`
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* @return is pointer to first instance of c or NULL if not found
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* @asyncsignalsafe
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*/
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void *wmemrchr(const wchar_t *s, wchar_t c, size_t n) {
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#if defined(__x86_64__) && !defined(__chibicc__)
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size_t bytes;
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const void *r;
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if (IsAsan()) {
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if (ckd_mul(&bytes, n, sizeof(wchar_t))) bytes = -1;
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__asan_verify(s, bytes);
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}
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r = wmemrchr_sse(s, c, n);
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return (void *)r;
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#else
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return (void *)wmemrchr_pure(s, c, n);
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#endif
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}
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