linux-kernel - Re: [PATCH] x86,boot: standardize strcmp()

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Message-ID: <CAJFMrCFqMN85izJ_BEsqMx5PV+RbjJDmR468hTa-Mt1bQvhXNA@mail.gmail.com>
Date:	Wed, 18 Mar 2015 23:40:10 +0530
From:	Arjun Sreedharan <arjun024@...il.com>
To:	Bernd Petrovitsch <bernd@...rovitsch.priv.at>
Cc:	Ingo Molnar <mingo@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86,boot: standardize strcmp()

On 18 March 2015 at 07:06, Bernd Petrovitsch <bernd@...rovitsch.priv.at> wrote:
> On Die, 2015-03-17 at 19:43 +0530, Arjun Sreedharan wrote:
> [...]
>> On a related note, IMO strcmp() should return {-1,0,1} since many
>> programmers just expect this behavior. just my opinion.
>
> -ENOPATCH.

Here's a patch

-- >8 --

Subject: [PATCH] arm,x86: limit strcmp() rc to {-1,0,1}

Signed-off-by: Arjun Sreedharan <arjun024@...il.com>
---
 arch/arm/boot/compressed/string.c | 2 +-
 arch/x86/boot/string.c            | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/boot/compressed/string.c
b/arch/arm/boot/compressed/string.c
index 36e53ef..e48df86 100644
--- a/arch/arm/boot/compressed/string.c
+++ b/arch/arm/boot/compressed/string.c
@@ -88,7 +88,7 @@ int strcmp(const char *cs, const char *ct)
  c2 = *ct++;
  res = c1 - c2;
  if (res)
- break;
+ return res < 0 ? -1 : 1;
  } while (c1);
  return res;
 }
diff --git a/arch/x86/boot/string.c b/arch/x86/boot/string.c
index 318b846..6eb333e 100644
--- a/arch/x86/boot/string.c
+++ b/arch/x86/boot/string.c
@@ -32,7 +32,7 @@ int strcmp(const char *str1, const char *str2)
  while (*s1 || *s2) {
  delta = *s1 - *s2;
  if (delta)
- return delta;
+ return delta < 0 ? -1 : 1;
  s1++;
  s2++;
  }
-- 

>
> MfG,
>         Bernd
> --
> "I dislike type abstraction if it has no real reason. And saving
> on typing is not a good reason - if your typing speed is the main
> issue when you're coding, you're doing something seriously wrong."
>     - Linus Torvalds
>
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