linux-kernel - Re: [PATCH v3] lib/string.c: implement stpcpy

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Message-ID: <202009060256.7CE5620A56@keescook>
Date:   Sun, 6 Sep 2020 02:57:27 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        stable <stable@...r.kernel.org>, Andy Lavr <andy.lavr@...il.com>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Joe Perches <joe@...ches.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        Yury Norov <yury.norov@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] lib/string.c: implement stpcpy

On Thu, Aug 27, 2020 at 12:58:35AM +0900, Masahiro Yamada wrote:
> On Tue, Aug 25, 2020 at 10:58 PM Nick Desaulniers
> <ndesaulniers@...gle.com> wrote:
> > [...]
> > +/**
> > + * stpcpy - copy a string from src to dest returning a pointer to the new end
> > + *          of dest, including src's %NUL-terminator. May overrun dest.
> > + * @dest: pointer to end of string being copied into. Must be large enough
> > + *        to receive copy.
> > + * @src: pointer to the beginning of string being copied from. Must not overlap
> > + *       dest.
> > + *
> > + * stpcpy differs from strcpy in a key way: the return value is the new
> > + * %NUL-terminated character. (for strcpy, the return value is a pointer to
> > + * src.
> 
> 
> return a pointer to src?
> 
> "man 3 strcpy" says:
> 
> The strcpy() and strncpy() functions return
> a pointer to the destination string *dest*.

Agreed; that's a typo.

-- 
Kees Cook