libc_data_t is 8 bytes wide, so a buffer which is 4-byte but not
8-byte aligned falls back to the byte at a time loop. Add a 32-bit
middle path so such buffers still handle four bytes per iteration.
* Add DETECTNULL32/DETECTCHAR32, UNALIGNED4/UNALIGNED4_X,
LITTLEBLOCKSIZE4/BIGBLOCKSIZE4 and TOO_SMALL4 to libs/libc/libc.h.
* Take the new path in memccpy, memcmp, memcpy, memset, stpcpy,
stpncpy, strcmp, strcpy, strncmp and strncpy when both pointers are
4-byte aligned but the 8-byte path can't be used.
Assisted-by: Claude:claude-opus-5
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
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>
Remove the incorrect address restoration logic in the memrchr fast
path. The UNALIGNED_X loop already ensures the proper alignment, so
the subsequent address recalculation is unnecessary and makes memrchr
return the wrong position.
This fixes the syslog message corruption where memrchr reports the
incorrect newline position.
Assisted-by: Claude:claude-opus-5
Signed-off-by: fangpeina <fangpeina@xiaomi.com>
Most hardware accesses the memory through a 64-bit bus, so handle the
data in 64-bit chunks instead of "long" chunks which are only 32-bit
wide on the 32-bit platforms.
* Add the libc_data_t type (unsigned long long) and move the shared
UNALIGNED/UNALIGNED_X/ALIGNED, LITTLEBLOCKSIZE, TOO_SMALL and
DETECTNULL helpers from the individual C files to libs/libc/libc.h.
* Convert all lib_bsd*.c implementations to the new type and macros,
which also drops the duplicated LONG_MAX conditionals.
Assisted-by: Claude:claude-opus-5
Signed-off-by: anjiahao <anjiahao@xiaomi.com>
remove reference to non-existent readme in libc.
Pointing to the documentation page doesn't make sense in this case,
because it doesn't explain the use of `#undef XXX` for this case anyway.
Signed-off-by: raiden00pl <raiden00@railab.me>
