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2026-05-12Merge patch series "add memdup_nul(), use it and memdup() in a few places"Tom Rini
Rasmus Villemoes <[email protected]> says: There are quite a few places where we allocate X+1 bytes, initialize the first X bytes via memcpy() and then set the last byte to 0. The kernel has a helper for that, kmemdup_nul(). Introduce a similar one, and start making use of it in a few places. Also the existing memdup() helper can be put to more use. There are lots more places one could modify. But for code shared with host tools, one would need to do some refactoring, putting memdup() and memdup_nul() in their own str-util.c TU which could then also be included in the tools build. Link: https://lore.kernel.org/r/[email protected]
2026-05-12lib/string.c: introduce memdup_nul() helperRasmus Villemoes
This is completely analogous to the linux kernel's kmemdup_nul() helper, apart from the lack of the gfp_t argument: Allocate a buffer of size {len}+1, copy {len} bytes from the given buffer, and add a final nul byte. This pattern exists in a number of places, so this helper can reduce some boilerplate code. Reviewed-by: Simon Glass <[email protected]> Signed-off-by: Rasmus Villemoes <[email protected]>
2026-05-12lib/string.c: drop pointless __HAVE_ARCH_STRDUPRasmus Villemoes
There has never been an arch-specific optimized implementation of str[n]dup, nor is there likely to ever be one, because unlike their cousins strlen(), strcpy() and similar that simply read/write the src/dst, the dup functions by definition involve memory allocation. So drop this irrelevant cpp guard. Reviewed-by: Simon Glass <[email protected]> Signed-off-by: Rasmus Villemoes <[email protected]>
2026-05-12string: fix prototype of memdup()Rasmus Villemoes
It doesn't make sense to restrict memdup() to only return char* pointers, especially when it is already defined to accept void*. This makes it uglier to use to e.g. duplicate a struct. Make it return void*, just as kmemdup() does in the kernel (and which our kmemdup() in fact also does). While in here, make a small optimization: memcpy() is defined to return the destination register, so we write this in a way that the compiler may do a tail call. Reviewed-by: Simon Glass <[email protected]> Signed-off-by: Rasmus Villemoes <[email protected]>
2026-04-21string: add strdup_const and kstrdup_constCasey Connolly
Extend Linux compat by adding kstrdup_const(), backed by lib/string.c. This leverages U-Boots .rodata section on ARM64 to avoid pointlessly duplicating const strings. This is used by the Linux CCF_FULL port and may be useful elsewhere in U-Boot. Signed-off-by: Casey Connolly <[email protected]>
2025-02-12lib: implement strnstr()Heinrich Schuchardt
Implement library function strnstr(). Implement strstr() using strnstr(). Sort the includes. Signed-off-by: Heinrich Schuchardt <[email protected]> Reviewed-by: Ilias Apalodimas <[email protected]> [jf: replace <stdint.h> by <limits.h>, folded from next patch] Signed-off-by: Jerome Forissier <[email protected]>
2024-07-29include: linux: Remove duplicate newlinesMarek Vasut
Drop all duplicate newlines. No functional change. Signed-off-by: Marek Vasut <[email protected]>
2022-01-19doc: replace @return by Return:Heinrich Schuchardt
Sphinx expects Return: and not @return to indicate a return value. find . -name '*.c' -exec \ sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \; find . -name '*.h' -exec \ sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \; Signed-off-by: Heinrich Schuchardt <[email protected]>
2021-10-08lib: Add memdup()Simon Glass
Add a function to duplicate a memory region, a little like strdup(). Signed-off-by: Simon Glass <[email protected]>
2021-04-12lib: string: Implement strlcatSean Anderson
This introduces strlcat, which provides a safer interface than strncat. It never copies more than its size bytes, including the terminating nul. In addition, it never reads past dest[size - 1], even if dest is not nul-terminated. This also removes the stub for dwc3 now that we have a proper implementation. Signed-off-by: Sean Anderson <[email protected]> Reviewed-by: Simon Glass <[email protected]>
2020-02-05sandbox: Rename strdup() functionsSimon Glass
These functions include calls to a memory-allocation routine and so need to use the system routine when called from a library. To preserve access to these functions for libraries that need it, such as SDL, rename these functions within U-Boot. Signed-off-by: Simon Glass <[email protected]>
2020-02-05string: Allow arch override of strndup() alsoSimon Glass
At present architectures can override strdup() but not strndup(). Use the same option for both. Signed-off-by: Simon Glass <[email protected]>
2019-06-05lib: Implement strndup()Thierry Reding
Signed-off-by: Thierry Reding <[email protected]> Signed-off-by: Tom Warren <[email protected]>
2017-06-01string: Add strcspn()Simon Glass
Add an implementation of strcspn() which returns the number of initial characters that do not match any in a rejection list. Signed-off-by: Simon Glass <[email protected]>
2017-06-01string: Add strchrnul()Simon Glass
This functions works like strchr() but returns the end of the string if the character is not found. Add an implementation of this. Signed-off-by: Simon Glass <[email protected]>
2016-06-06Remove unneeded remnants of bcopy().Robert P. J. Day
Since bcopy() is no longer used, delete all remaining references to it. Signed-off-by: Robert P. J. Day <[email protected]>
2014-12-11lib: string: move strlcpy() to a common placeMasahiro Yamada
Move strlcpy() definition from drivers/usb/gadget/ether.c to lib/string.c because it is a very useful function. Let's add the prototype to include/linux/string.h too. Signed-off-by: Masahiro Yamada <[email protected]> Acked-by: Simon Glass <[email protected]>
2014-10-25string.h: add missing prototypesJeroen Hofstee
Signed-off-by: Jeroen Hofstee <[email protected]>
2013-05-31mtd: resync with Linux-3.7.1Sergey Lapin
This patch is essentially an update of u-boot MTD subsystem to the state of Linux-3.7.1 with exclusion of some bits: - the update is concentrated on NAND, no onenand or CFI/NOR/SPI flashes interfaces are updated EXCEPT for API changes. - new large NAND chips support is there, though some updates have got in Linux-3.8.-rc1, (which will follow on top of this patch). To produce this update I used tag v3.7.1 of linux-stable repository. The update was made using application of relevant patches, with changes relevant to U-Boot-only stuff sticked together to keep bisectability. Then all changes were grouped together to this patch. Signed-off-by: Sergey Lapin <[email protected]> [[email protected]: some eccstrength and build fixes] Signed-off-by: Scott Wood <[email protected]>
2012-12-13Make linux kernel string funcs available to toolsJoe Hershberger
isspace() and strim() are not in the typical user-mode string.h, so put them in a separate compilation unit so that they can be built into tools that need them independent of the other common string functions. This allows code shared by u-boot and the linux user-mode tools to link. Signed-off-by: Joe Hershberger <[email protected]>
2012-12-11Add strcasecmp() and strncasecmp()Simon Glass
strncasecmp() is present as strnicmp() but disabled. Make it available and define strcasecmp() also. There is a only a small performance penalty to having strcasecmp() call strncasecmp(), so do this instead of a standalone function, to save code space. Update the prototype in arch-specific headers as needed to avoid warnings. Signed-off-by: Simon Glass <[email protected]>
2012-01-26nand: Sanitize ONFI strings.Christian Hitz
[backport from linux commit 02f8c6aee8df3cdc935e9bdd4f2d020306035dbe] This is part of the synchronization with the nand driver to the Linux 3.0 state. Signed-off-by: Christian Hitz <[email protected]> Cc: Scott Wood <[email protected]> Signed-off-by: Scott Wood <[email protected]>
2006-05-03Scheduled for removal: strnicmp() which is unusedWolfgang Denk
2004-03-23* Patch by Carl Riechers, 17 Mar 2004:wdenk
Ignore '\0' characters in console input for use with telnet and telco pads. * Patch by Leon Kukovec, 17 Mar 2004: typo fix for strswab prototype #ifdef
2004-03-14* Patch by Yuli Barcohen, 4 Mar 2004:wdenk
Fix problems with GCC 3.3.x which changed handling of global variables explicitly initialized to zero (now in .bss instead of .data as before). * Patch by Leon Kukovec, 02 Mar 2004: add strswab() to fix IDE LBA capacity, firmware and model numbers on little endian machines * Patch by Masami Komiya, 02 Mar 2004: - Remove get_ticks() from NFS code - Add verification of RPC transaction ID * Patch by Pierre Aubert, 02 Mar 2004: cleanup for IDE and USB drivers for MPC5200
2001-10-17Initial revisionwdenk