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- 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
This commit is contained in:
Justine Tunney 2023-09-06 03:54:42 -07:00
parent 8596e83cce
commit f531acc8f9
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GPG key ID: BE714B4575D6E328
297 changed files with 1920 additions and 1681 deletions
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16
libc/intrin/memchr.c
View file

@ -22,7 +22,7 @@
#include "libc/str/str.h"
#ifndef __aarch64__
typedef char xmm_t __attribute__((__vector_size__(16), __aligned__(1)));
typedef char xmm_t __attribute__((__vector_size__(16), __aligned__(16)));
static inline const unsigned char *memchr_pure(const unsigned char *s,
unsigned char c, size_t n) {
@ -68,14 +68,22 @@ dontasan static inline const unsigned char *memchr_sse(const unsigned char *s,
* @return is pointer to first instance of c or NULL if not found
* @asyncsignalsafe
*/
void *memchr(const void *s, int c, size_t n) {
dontasan void *memchr(const void *s, int c, size_t n) {
#if defined(__x86_64__) && !defined(__chibicc__)
const void *r;
if (IsAsan()) __asan_verify(s, n);
r = memchr_sse(s, c, n);
const unsigned char *p = (const unsigned char *)s;
while (n && ((intptr_t)p & 15)) {
if (*p == (unsigned char)c) {
return (void *)p;
}
++p;
--n;
}
r = memchr_sse(p, c, n);
return (void *)r;
#else
return memchr_pure(s, c, n);
return (void *)memchr_pure(s, c, n);
#endif
}