kernel/linux.git/tools/include/nolibc/string.h, branch v6.19.11

tools/nolibc: add missing memchr() to string.h

2025-11-02T11:11:48+00:00

Surprisingly we forgot to add this common one. It was added with a per-arch guard allowing to later implement it in arch-specific asm code like was done for a few other ones. The test verifies that we don't search past the indicated length. Signed-off-by: Willy Tarreau Signed-off-by: Thomas Weißschuh

tools/nolibc: add strstr()

2025-05-21T13:32:00+00:00

This is used in various selftests and will be handy when integrating those with nolibc. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-1-3c043eeab06c@linutronix.de Signed-off-by: Thomas Weißschuh

tools/nolibc: include nolibc.h early from all header files

2025-05-21T13:31:50+00:00

Inclusion of any nolibc header file should also bring all other headers. On the other hand it should also be possible to include any nolibc header files in any order. Currently this is implemented by including the catch-all nolibc.h after the headers own definitions. This is problematic if one nolibc header depends on another one. The first header has to include the other one before defining any symbols. That in turn will include the rest of nolibc while the current header has not defined anything yet. If any other part of nolibc depends on definitions from the current header, errors are encountered. This is already the case today. Effectively nolibc can only be included in the order of nolibc.h. Restructure the way "nolibc.h" is included. Move it to the beginning of the header files and before the include guards. Now any header will behave exactly like "nolibc.h" while the include guards prevent any duplicate definitions. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://lore.kernel.org/r/20250424-nolibc-header-check-v1-2-011576b6ed6f@linutronix.de

tools/nolibc: add tolower() and toupper()

2025-04-22T08:56:26+00:00

The kselftest harness uses these functions. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau

tools/nolibc: add prototypes for non-static functions

2025-02-03T19:57:37+00:00

With -Wmissing-prototypes the compiler will warn about non-static functions which don't have a prototype defined. This warning doesn't make much sense for nolibc itself but for user code it is still useful. To pacify the compiler add prototypes next to the function definitions, similar to how it is handled elsewhere in the kernel. Acked-by: Willy Tarreau Link: https://lore.kernel.org/r/20250123-nolibc-prototype-v1-1-e1afc5c1999a@weissschuh.net Signed-off-by: Thomas Weißschuh

tools/nolibc: include arch.h from string.h

2024-07-29T05:52:56+00:00

string.h tests for the macros NOLIBC_ARCH_HAS_$FUNC to use the architecture-optimized function variants. However if string.h is included before arch.h header then that check does not work, leading to duplicate function definitions. Fixes: 553845eebd60 ("tools/nolibc: x86-64: Use `rep movsb` for `memcpy()` and `memmove()`") Fixes: 12108aa8c1a1 ("tools/nolibc: x86-64: Use `rep stosb` for `memset()`") Cc: stable@vger.kernel.org Acked-by: Willy Tarreau Link: https://lore.kernel.org/r/20240725-arch-has-func-v1-1-5521ed354acd@weissschuh.net Signed-off-by: Thomas Weißschuh

tools/nolibc/string: remove open-coded strnlen()

2024-04-10T21:27:06+00:00

The same header already defines an implementation of strnlen(), so use it. Signed-off-by: Thomas Weißschuh

tools/nolibc: Fix strlcpy() return code and size usage

2024-04-10T21:19:02+00:00

The return code should always be strlen(src), and we should copy at most size-1 bytes. While we are there, make sure to null-terminate the dst buffer if we copied something. Signed-off-by: Rodrigo Campos Signed-off-by: Thomas Weißschuh

tools/nolibc: Fix strlcat() return code and size usage

2024-04-10T21:19:01+00:00

The return code should always be strlen(src) + strnlen(dst, size). Let's make sure to copy at most size-1 bytes from src and null-terminate the dst buffer if we did copied something. While we can use strnlen() and strncpy() to implement strlcat(), this is simple enough and results in shorter code when compiled. Signed-off-by: Rodrigo Campos Signed-off-by: Thomas Weißschuh

tools/nolibc/string: export strlen()

2024-04-10T21:19:01+00:00

As with commit 8d304a374023, "tools/nolibc/string: export memset() and memmove()", gcc -Os without -ffreestanding may fail to compile with: cc -fno-asynchronous-unwind-tables -fno-ident -s -Os -nostdlib -lgcc -static -o test test.c /usr/bin/ld: /tmp/cccIasKL.o: in function `main': test.c:(.text.startup+0x1e): undefined reference to `strlen' collect2: error: ld returned 1 exit status As on the aforementioned commit, this patch adds a section to export this function so compilation works on those cases too. Signed-off-by: Rodrigo Campos Signed-off-by: Thomas Weißschuh