u-boot.git/lib/string.c, branch v2022.07-rc6

lib: Add memdup()

2021-10-08T19:53:26+00:00

Add a function to duplicate a memory region, a little like strdup().

Signed-off-by: Simon Glass

string: make memcpy(), memset(), memcmp() and memmove() visible for LTO

2021-05-24T18:21:30+00:00

It seems that sometimes (happening on ARM64, for example with
turris_mox_defconfig) GCC, when linking with LTO, changes the symbol
names of some functions, for example lib/string.c's memcpy() function to
memcpy.isra.0.

This is a problem however when GCC for a code such as this:
	struct some_struct *info = get_some_struct();
	struct some struct tmpinfo;
	tmpinfo = *info;
emits a call to memcpy() by builtin behaviour, to copy *info to tmpinfo.

This then results in the following linking error:
  .../lz4.c:93: undefined reference to `memcpy'
  .../uuid.c:206: more undefined references to `memcpy' follow

GCC's documentation says this about -nodefaultlibs option:
  The compiler may generate calls to "memcmp", "memset", "memcpy" and
  "memmove".  These entries are usually resolved by entries in libc.
  These entry points should be supplied through some other mechanism
  when this option is specified.

Make these functions visible by using the __used macro to avoid this
error.

Signed-off-by: Marek Behún 
Reviewed-by: Simon Glass

lib: string: Implement strlcat

2021-04-12T21:44:55+00:00

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 
Reviewed-by: Simon Glass

lib: string: Fix strlcpy return value

2021-04-12T21:44:55+00:00

strlcpy should always return the number of bytes copied. We were
accidentally missing the nul-terminator. We also always used to return a
non-zero value, even if we did not actually copy anything.

Fixes: 23cd138503 ("Integrate USB gadget layer and USB CDC driver layer")

Signed-off-by: Sean Anderson

string: Use memcpy() within memmove() when we can

2021-01-16T19:49:09+00:00

A common use of memmove() can be handled by memcpy(). Also memcpy()
includes an optimization for large sizes: it copies a word at a time. So
we can get a speed-up by calling memcpy() to handle our move in this case.

Update memmove() to call also memcpy() if the source don't overlap
the destination (src + count <= dest).

Signed-off-by: Patrick Delaunay

string: Allow arch override of strndup() also

2020-02-06T02:33:46+00:00

At present architectures can override strdup() but not strndup(). Use
the same option for both.

Signed-off-by: Simon Glass

lib: Implement strndup()

2019-06-05T16:16:32+00:00

Signed-off-by: Thierry Reding 
Signed-off-by: Tom Warren

string: Include the config header

2018-11-21T02:14:22+00:00

At present the config header is not included in this file, but it does use
a CONFIG option. Fix it.

Signed-off-by: Simon Glass

string: Add strcspn()

2017-06-01T13:03:12+00:00

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

string: Add strchrnul()

2017-06-01T13:03:12+00:00

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