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nuttx/libs/libc/string
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anjiahao 7f5f0f5e53 libs/libc/string: Fix asrc alignment for unaligned access in memrchr. 
memrchr scans backward, so the original implementation aligned
(x + 1) rather than x:

  #define UNALIGNED(x) ((long)(uintptr_t)((x) + 1) & (sizeof(long) - 1))

while the common UNALIGNED_X() macro checks the pointer itself.  Pass
src0 + 1 to UNALIGNED_X() to restore the original behavior, otherwise
asrc is off by one byte and the word loop reads the wrong data.

Assisted-by: Claude:claude-opus-5
Signed-off-by: anjiahao <anjiahao@xiaomi.com>
2026-08-17 10:47:33 +02:00
..
CMakeLists.txt libc/string: Add BSD-optimized memset implementation. 2026-02-04 03:02:04 +08:00
Kconfig libc: Rename LIBC_STRING_OPTIMIZE to LIBC_NEWLIB_OPTSPEED 2025-01-20 22:27:19 +08:00
lib_bsdmemccpy.c libs/libc/string: Use long long to speed up the BSD string functions. 2026-08-17 10:47:33 +02:00
lib_bsdmemchr.c libs/libc/string: Use long long to speed up the BSD string functions. 2026-08-17 10:47:33 +02:00
lib_bsdmemcmp.c libs/libc/string: Use long long to speed up the BSD string functions. 2026-08-17 10:47:33 +02:00
lib_bsdmemcpy.c libs/libc/string: Use long long to speed up the BSD string functions. 2026-08-17 10:47:33 +02:00
lib_bsdmemrchr.c libs/libc/string: Fix asrc alignment for unaligned access in memrchr. 2026-08-17 10:47:33 +02:00
lib_bsdmemset.c libs/libc/string: Use long long to speed up the BSD string functions. 2026-08-17 10:47:33 +02:00
lib_bsdstpcpy.c libs/libc/string: Use long long to speed up the BSD string functions. 2026-08-17 10:47:33 +02:00
lib_bsdstpncpy.c libs/libc/string: Use long long to speed up the BSD string functions. 2026-08-17 10:47:33 +02:00
lib_bsdstrcat.c libs/libc/string: Use long long to speed up the BSD string functions. 2026-08-17 10:47:33 +02:00
lib_bsdstrchr.c libs/libc/string: Use long long to speed up the BSD string functions. 2026-08-17 10:47:33 +02:00
lib_bsdstrchrnul.c libc_bsd:add missing SPDX-License 2026-02-04 03:02:04 +08:00
lib_bsdstrcmp.c libs/libc/string: Use long long to speed up the BSD string functions. 2026-08-17 10:47:33 +02:00
lib_bsdstrcpy.c libs/libc/string: Use long long to speed up the BSD string functions. 2026-08-17 10:47:33 +02:00
lib_bsdstrlen.c libs/libc/string: Use long long to speed up the BSD string functions. 2026-08-17 10:47:33 +02:00
lib_bsdstrncmp.c libs/libc/string: Use long long to speed up the BSD string functions. 2026-08-17 10:47:33 +02:00
lib_bsdstrncpy.c libs/libc/string: Use long long to speed up the BSD string functions. 2026-08-17 10:47:33 +02:00
lib_bsdstrrchr.c libc_bsd:add missing SPDX-License 2026-02-04 03:02:04 +08:00
lib_explicit_bzero.c libs/libc: migrate to SPDX identifier 2024-10-01 12:25:52 +08:00
lib_ffs.c libs/libc: migrate to SPDX identifier 2024-10-01 12:25:52 +08:00
lib_ffsl.c libs/libc: migrate to SPDX identifier 2024-10-01 12:25:52 +08:00
lib_ffsll.c !compiler: drop CONFIG_HAVE_LONG_LONG and require long long support 2026-05-19 16:21:28 +08:00
lib_fls.c libs/libc: migrate to SPDX identifier 2024-10-01 12:25:52 +08:00
lib_flsl.c libs/libc: migrate to SPDX identifier 2024-10-01 12:25:52 +08:00
lib_flsll.c !compiler: drop CONFIG_HAVE_LONG_LONG and require long long support 2026-05-19 16:21:28 +08:00
lib_index.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_isbasedigit.c libs/libc: migrate to SPDX identifier 2024-10-01 12:25:52 +08:00
lib_memccpy.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_memchr.c string:use builtin function to optimize libc function 2025-12-20 10:38:53 +08:00
lib_memcmp.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_memcpy.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_memmem.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_memmove.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_mempcpy.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_memrchr.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_memset.c !compiler: drop CONFIG_HAVE_LONG_LONG and require long long support 2026-05-19 16:21:28 +08:00
lib_popcount.c libs/libc: migrate to SPDX identifier 2024-10-01 12:25:52 +08:00
lib_popcountl.c libs/libc: migrate to SPDX identifier 2024-10-01 12:25:52 +08:00
lib_popcountll.c libs/libc: migrate to SPDX identifier 2024-10-01 12:25:52 +08:00
lib_rawmemchr.c libs/libc: migrate to SPDX identifier 2024-10-01 12:25:52 +08:00
lib_rindex.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_skipspace.c libs/libc: migrate to SPDX identifier 2024-10-01 12:25:52 +08:00
lib_stpcpy.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_stpncpy.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_strcasecmp.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_strcasestr.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_strcat.c string:use builtin function to optimize libc function 2025-12-20 10:38:53 +08:00
lib_strchr.c string:use builtin function to optimize libc function 2025-12-20 10:38:53 +08:00
lib_strchrnul.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_strcmp.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_strcoll.c Merge the newlibc string into NuttX. 2024-10-17 22:52:42 +08:00
lib_strcpy.c string:use builtin function to optimize libc function 2025-12-20 10:38:53 +08:00
lib_strcspn.c string:use builtin function to optimize libc function 2025-12-20 10:38:53 +08:00
lib_strdup.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_strerror.c libs/libc: migrate to SPDX identifier 2024-10-01 12:25:52 +08:00
lib_strerrorr.c libs/libc: migrate to SPDX identifier 2024-10-01 12:25:52 +08:00
lib_strlcat.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_strlcpy.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_strlen.c string:use builtin function to optimize libc function 2025-12-20 10:38:53 +08:00
lib_strncasecmp.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_strncat.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_strncmp.c string:use builtin function to optimize libc function 2025-12-20 10:38:53 +08:00
lib_strncpy.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_strndup.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_strnlen.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_strpbrk.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_strrchr.c string:use builtin function to optimize libc function 2025-12-20 10:38:53 +08:00
lib_strsep.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_strsignal.c libs/libc: migrate to SPDX identifier 2024-10-01 12:25:52 +08:00
lib_strspn.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_strstr.c string:use builtin function to optimize libc function 2025-12-20 10:38:53 +08:00
lib_strtok.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_strtokr.c libc: remove reference to non-existent readme 2025-10-11 17:07:51 -04:00
lib_strverscmp.c libs/libc: migrate to SPDX identifier 2024-10-01 12:25:52 +08:00
lib_strxfrm.c libs/libc: migrate to SPDX identifier 2024-10-01 12:25:52 +08:00
lib_timingsafe_bcmp.c libs/libc: migrate to SPDX identifier 2024-10-01 12:25:52 +08:00
lib_vikmemcpy.c !compiler: drop CONFIG_HAVE_LONG_LONG and require long long support 2026-05-19 16:21:28 +08:00
Make.defs libc/string: Add BSD-optimized memset implementation. 2026-02-04 03:02:04 +08:00