[PATCH 1/2] libc: Make string.h POSIX.1-2024 compliant

[Joel Sherrill]

This looks ok to me. Checked against POSIX Issue 8.

--joel

On Fri, Nov 14, 2025 at 4:02 PM Simon Barth <simon.barth@gmx.de> wrote:

> POSIX.1-2024 added strlcpy, strlcat, and memmem to strings.h. Previously
> these functions were only available as parts of BSD or GNU extensions.
>
> Fix the header so that the symbol are visible for either the right
> extensions, or for POSIX.1-2024.
> ---
>  newlib/libc/include/string.h | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/newlib/libc/include/string.h b/newlib/libc/include/string.h
> index 32199c027..3e66ec3dd 100644
> --- a/newlib/libc/include/string.h
> +++ b/newlib/libc/include/string.h
> @@ -68,10 +68,12 @@ void *       memccpy (void *__restrict, const void
> *__restrict, int, size_t);
>  #endif
>  #if __GNU_VISIBLE
>  void *  mempcpy (void *, const void *, size_t);
> -void *  memmem (const void *, size_t, const void *, size_t);
>  void *  memrchr (const void *, int, size_t);
>  void *  rawmemchr (const void *, int);
>  #endif
> +#if __GNU_VISIBLE || __POSIX_VISIBLE >= 202405
> +void *  memmem (const void *, size_t, const void *, size_t);
> +#endif
>  #if __POSIX_VISIBLE >= 200809
>  char   *stpcpy (char *__restrict, const char *__restrict);
>  char   *stpncpy (char *__restrict, const char *__restrict, size_t);
> @@ -111,7 +113,7 @@ int __xpg_strerror_r (int, char *, size_t);
>  /* Reentrant version of strerror.  */
>  char * _strerror_r (struct _reent *, int, int, int *);
>
> -#if __BSD_VISIBLE
> +#if __BSD_VISIBLE || __POSIX_VISIBLE >= 202405L
>  size_t strlcat (char *, const char *, size_t);
>  size_t strlcpy (char *, const char *, size_t);
>  #endif
> --
> 2.51.2
>
>
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