linux-kernel - RE: [PATCH] crypto: hisilicon - fix strncpy warning with strlcpy

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Date:   Sun, 7 Jun 2020 13:03:45 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Herbert Xu' <herbert@...dor.apana.org.au>,
        Zhangfei Gao <zhangfei.gao@...aro.org>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        wangzhou1 <wangzhou1@...ilicon.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "kbuild-all@...ts.01.org" <kbuild-all@...ts.01.org>
Subject: RE: [PATCH] crypto: hisilicon - fix strncpy warning with strlcpy

From: Herbert Xu
> Sent: 05 June 2020 13:17
...
> Better yet use strscpy which will even return an error for you.

It really ought to return the buffer length on truncation.
Then you can loop:
	while(...)
		buf += strxxxcpy(buf, src, buf_end - buf);
and only check right at the end.

	David

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