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07616721f1fa6cb215ffbef23441cae80412484f
semi-libc/src/string
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Gabriel RavierandRich Felker 07616721f1 fix return value of wcs{,n}cmp for extreme wchar_t values 
As a result of using simple subtraction to implement the return values
for wcscmp and wcsncmp, integer overflow can occur (producing
undefined behavior, and in practice, a wrong comparison result). This
does not occur for meaningful character values (21-bit range) but the
functions are specified to work on arbitrary wchar_t arrays.

This patch replaces the subtraction with a little bit of code that
orders the characters correctly, returning -1 if the character from
the first string is smaller than the one from the second, 0 if they
are equal and 1 if the character from the first string is larger than
the one from the second.
2023-02-12 17:50:59 -05:00
..
aarch64
add optimized aarch64 memcpy and memset
2020-06-26 17:49:51 -04:00
arm
add big-endian support to ARM assembler memcpy
2020-06-25 19:11:13 -04:00
i386
remove the last of possible-textrels from i386 asm
2015-04-18 20:45:39 -04:00
x86_64
remove potentially PIC-incompatible relocations from x86_64 and x32 asm
2015-04-18 21:18:23 -04:00
bcmp.c
include cleanups: remove unused headers and add feature test macros
2013-12-12 05:09:18 +00:00
bcopy.c
include cleanups: remove unused headers and add feature test macros
2013-12-12 05:09:18 +00:00
bzero.c
include cleanups: remove unused headers and add feature test macros
2013-12-12 05:09:18 +00:00
explicit_bzero.c
optimize explicit_bzero for size
2018-07-02 17:14:54 -04:00
index.c
include cleanups: remove unused headers and add feature test macros
2013-12-12 05:09:18 +00:00
memccpy.c
remove redundant condition in memccpy
2020-03-20 15:45:08 -04:00
memchr.c
fix aliasing-based undefined behavior in string functions
2018-09-26 14:39:10 -04:00
memcmp.c
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
memcpy.c
optimized C memcpy
2013-08-28 03:34:57 -04:00
memmem.c
fix undefined behavior from signed overflow in strstr and memmem
2020-04-30 21:52:28 -04:00
memmove.c
fix aliasing-based undefined behavior in string functions
2018-09-26 14:39:10 -04:00
mempcpy.c
include cleanups: remove unused headers and add feature test macros
2013-12-12 05:09:18 +00:00
memrchr.c
reduce spurious inclusion of libc.h
2018-09-12 14:34:37 -04:00
memset.c
fix undefined behavior in memset due to missing sequence points
2017-08-29 19:53:50 -04:00
rindex.c
include cleanups: remove unused headers and add feature test macros
2013-12-12 05:09:18 +00:00
stpcpy.c
fix aliasing-based undefined behavior in string functions
2018-09-26 14:39:10 -04:00
stpncpy.c
fix aliasing-based undefined behavior in string functions
2018-09-26 14:39:10 -04:00
strcasecmp.c
reduce spurious inclusion of libc.h
2018-09-12 14:34:37 -04:00
strcasestr.c
replace stub with working strcasestr
2013-02-21 23:54:25 -05:00
strcat.c
use restrict everywhere it's required by c99 and/or posix 2008
2012-09-06 22:44:55 -04:00
strchr.c
overhaul internally-public declarations using wrapper headers
2018-09-12 14:34:33 -04:00
strchrnul.c
fix aliasing-based undefined behavior in string functions
2018-09-26 14:39:10 -04:00
strcmp.c
strcmp: Remove unnecessary check for *r
2013-11-23 16:17:38 -05:00
strcpy.c
overhaul internally-public declarations using wrapper headers
2018-09-12 14:34:33 -04:00
strcspn.c
overhaul internally-public declarations using wrapper headers
2018-09-12 14:34:33 -04:00
strdup.c
remove or make static various unused __-prefixed symbols
2018-09-12 14:34:35 -04:00
strerror_r.c
reduce spurious inclusion of libc.h
2018-09-12 14:34:37 -04:00
strlcat.c
more header cleanup and conformance fixes - string.h
2011-02-14 20:53:15 -05:00
strlcpy.c
fix aliasing-based undefined behavior in string functions
2018-09-26 14:39:10 -04:00
strlen.c
fix aliasing-based undefined behavior in string functions
2018-09-26 14:39:10 -04:00
strncasecmp.c
reduce spurious inclusion of libc.h
2018-09-12 14:34:37 -04:00
strncat.c
use restrict everywhere it's required by c99 and/or posix 2008
2012-09-06 22:44:55 -04:00
strncmp.c
fix all implicit conversion between signed/unsigned pointers
2011-03-25 16:34:03 -04:00
strncpy.c
overhaul internally-public declarations using wrapper headers
2018-09-12 14:34:33 -04:00
strndup.c
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
strnlen.c
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
strpbrk.c
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
strrchr.c
overhaul internally-public declarations using wrapper headers
2018-09-12 14:34:33 -04:00
strsep.c
fix prototype for strsep
2011-04-06 14:28:29 -04:00
strsignal.c
handle possibility that SIGEMT replaces SIGSTKFLT in strsignal
2020-05-21 16:25:12 -04:00
strspn.c
fix all implicit conversion between signed/unsigned pointers
2011-03-25 16:34:03 -04:00
strstr.c
fix misleading comment in strstr
2020-12-09 11:34:29 -05:00
strtok_r.c
use restrict everywhere it's required by c99 and/or posix 2008
2012-09-06 22:44:55 -04:00
strtok.c
use restrict everywhere it's required by c99 and/or posix 2008
2012-09-06 22:44:55 -04:00
strverscmp.c
fix strverscmp comparison of digit sequence with non-digits
2022-11-07 22:33:24 -05:00
swab.c
fix handling of odd lengths in swab function
2014-10-04 11:14:01 -04:00
wcpcpy.c
use restrict everywhere it's required by c99 and/or posix 2008
2012-09-06 22:44:55 -04:00
wcpncpy.c
use restrict everywhere it's required by c99 and/or posix 2008
2012-09-06 22:44:55 -04:00
wcscasecmp_l.c
add all missing wchar functions except floating point parsers
2012-03-01 23:24:45 -05:00
wcscasecmp.c
add all missing wchar functions except floating point parsers
2012-03-01 23:24:45 -05:00
wcscat.c
use restrict everywhere it's required by c99 and/or posix 2008
2012-09-06 22:44:55 -04:00
wcschr.c
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
wcscmp.c
fix return value of wcs{,n}cmp for extreme wchar_t values
2023-02-12 17:50:59 -05:00
wcscpy.c
use restrict everywhere it's required by c99 and/or posix 2008
2012-09-06 22:44:55 -04:00
wcscspn.c
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
wcsdup.c
reduce spurious inclusion of libc.h
2018-09-12 14:34:37 -04:00
wcslen.c
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
wcsncasecmp_l.c
add all missing wchar functions except floating point parsers
2012-03-01 23:24:45 -05:00
wcsncasecmp.c
add all missing wchar functions except floating point parsers
2012-03-01 23:24:45 -05:00
wcsncat.c
use restrict everywhere it's required by c99 and/or posix 2008
2012-09-06 22:44:55 -04:00
wcsncmp.c
fix return value of wcs{,n}cmp for extreme wchar_t values
2023-02-12 17:50:59 -05:00
wcsncpy.c
use restrict everywhere it's required by c99 and/or posix 2008
2012-09-06 22:44:55 -04:00
wcsnlen.c
add all missing wchar functions except floating point parsers
2012-03-01 23:24:45 -05:00
wcspbrk.c
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
wcsrchr.c
fix wrong type for wcsrchr argument 2
2011-06-13 14:06:04 -04:00
wcsspn.c
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
wcsstr.c
fix false negatives with periodic needles in strstr, wcsstr, and memmem
2014-04-18 17:38:35 -04:00
wcstok.c
use restrict everywhere it's required by c99 and/or posix 2008
2012-09-06 22:44:55 -04:00
wcswcs.c
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
wmemchr.c
include cleanups: remove unused headers and add feature test macros
2013-12-12 05:09:18 +00:00
wmemcmp.c
include cleanups: remove unused headers and add feature test macros
2013-12-12 05:09:18 +00:00
wmemcpy.c
include cleanups: remove unused headers and add feature test macros
2013-12-12 05:09:18 +00:00
wmemmove.c
optimize nop case of wmemmove
2018-09-23 02:51:01 -04:00
wmemset.c
include cleanups: remove unused headers and add feature test macros
2013-12-12 05:09:18 +00:00