LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Sergei Organov <osv@javad.com>
To: Jan Engelhardt <jengelh@linux01.gwdg.de>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: somebody dropped a (warning) bomb
Date: Fri, 09 Feb 2007 18:10:20 +0300	[thread overview]
Message-ID: <87veibqsdf.fsf@javad.com> (raw)
In-Reply-To: <Pine.LNX.4.61.0702081851310.1364@yvahk01.tjqt.qr> (Jan Engelhardt's message of "Thu, 8 Feb 2007 19:42:07 +0100 (MET)")

Jan Engelhardt <jengelh@linux01.gwdg.de> writes:
> On Feb 8 2007 08:33, Linus Torvalds wrote:
>>
[...]
> What C needs is a distinction between char and int8_t, rendering "char" 
> an unsigned at all times basically and making "unsigned char" and 
> "signed char" illegal types in turn.

AFAIK, C already has 3 *distinct* types, "char", "signed char", and
"unsigned char". So your int8_t reads "signed char" in C, uint8_t reads
"unsigned char" in C, while "char" is yet another type that is not
compatible with those two. Yes, the names for these types are somewhat
confusing, but that's due to historical reasons, I think.

Overall,

signed char   == tiny signed int   == tiny int
unsigned char == tiny unsigned int
char != signed char
char != unsigned char

where

tiny == short short ;)

Rules of thumb: don't use bare char to store integers; don't use
signed/unsigned char to store characters.

[strxxx() routines take char* arguments as they work on '\0'-terminated
character arrays (strings). Using them on arrays of tiny integers is
unsafe no matter how char behaves on given platform (like signed or like
unsigned type).]

-- Sergei.

  parent reply	other threads:[~2007-02-09 15:10 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-08 15:00 Jeff Garzik
2007-02-08 16:33 ` Linus Torvalds
2007-02-08 18:42   ` Jan Engelhardt
2007-02-08 19:53     ` Linus Torvalds
2007-02-08 21:10       ` Jan Engelhardt
2007-02-08 21:37         ` Linus Torvalds
2007-02-08 23:12           ` David Rientjes
2007-02-08 23:37             ` Linus Torvalds
2007-02-09  0:24               ` David Rientjes
2007-02-09  0:42                 ` Linus Torvalds
2007-02-09  0:59                   ` Linus Torvalds
2007-02-09  0:59                   ` David Rientjes
2007-02-09  1:11                     ` Linus Torvalds
2007-02-09  1:18                       ` David Rientjes
2007-02-09 15:38                         ` Linus Torvalds
2007-02-09  3:27                   ` D. Hazelton
2007-02-09 19:54                     ` Pete Zaitcev
2007-02-09 12:34                   ` Jan Engelhardt
2007-02-09 13:16                     ` linux-os (Dick Johnson)
2007-02-09 17:45                       ` Jan Engelhardt
2007-02-09 20:29                         ` linux-os (Dick Johnson)
2007-02-09 22:05                           ` Jan Engelhardt
2007-02-09 22:58                             ` Martin Mares
2007-02-12 18:50                             ` linux-os (Dick Johnson)
2007-02-13 15:14                     ` Dick Streefland
2007-02-08 21:13       ` J.A. Magallón
2007-02-08 21:42         ` Linus Torvalds
2007-02-08 22:03           ` Linus Torvalds
2007-02-08 22:19             ` Willy Tarreau
2007-02-09  0:03             ` J.A. Magallón
2007-02-09  0:22               ` Linus Torvalds
2007-02-09 12:38             ` Sergei Organov
2007-02-09 15:58               ` Linus Torvalds
2007-02-12 11:12                 ` Sergei Organov
2007-02-12 16:26                   ` Linus Torvalds
2007-02-13 18:06                     ` Sergei Organov
2007-02-13 18:26                       ` Pekka Enberg
2007-02-13 19:14                         ` Sergei Organov
2007-02-13 19:43                           ` Pekka Enberg
2007-02-13 20:29                             ` Sergei Organov
2007-02-13 21:31                               ` Jeff Garzik
2007-02-13 23:21                               ` Linus Torvalds
2007-02-15 13:20                                 ` Sergei Organov
2007-02-15 15:57                                   ` Linus Torvalds
2007-02-15 18:53                                     ` Sergei Organov
2007-02-15 19:02                                       ` Linus Torvalds
2007-02-15 20:23                                         ` me, not " Oleg Verych
2007-02-16  4:26                                         ` Rene Herman
2007-02-19 11:58                                           ` Sergei Organov
2007-02-19 13:58                                         ` Sergei Organov
2007-02-15 22:32                                     ` Lennart Sorensen
2007-02-13 19:25                       ` Linus Torvalds
2007-02-13 19:59                         ` Sergei Organov
2007-02-13 20:24                           ` Linus Torvalds
2007-02-15 15:15                             ` Sergei Organov
2007-02-13 21:13                         ` Rob Landley
2007-02-13 22:21                       ` Olivier Galibert
2007-02-14 12:52                         ` Sergei Organov
2007-02-15 20:06                         ` Sergei Organov
2007-02-09 15:10     ` Sergei Organov [this message]
2007-02-08 16:35 ` Kumar Gala
     [not found] <7Mj5f-3oz-21@gated-at.bofh.it>
     [not found] ` <7MktH-5EW-35@gated-at.bofh.it>
     [not found]   ` <7Mmvy-vj-17@gated-at.bofh.it>
     [not found]     ` <7MnBC-2fk-13@gated-at.bofh.it>
     [not found]       ` <7MoQx-4p8-11@gated-at.bofh.it>
     [not found]         ` <7MpjE-50z-7@gated-at.bofh.it>
     [not found]           ` <7MpCS-5Fe-9@gated-at.bofh.it>
     [not found]             ` <7MDd7-17w-1@gated-at.bofh.it>
     [not found]               ` <7MGkB-62k-31@gated-at.bofh.it>
     [not found]                 ` <7NHoe-2Mb-37@gated-at.bofh.it>
     [not found]                   ` <7NMe9-1ZN-7@gated-at.bofh.it>
     [not found]                     ` <7Oagl-6bO-1@gated-at.bofh.it>
     [not found]                       ` <7ObvW-89N-23@gated-at.bofh.it>
     [not found]                         ` <7Oc8t-NS-1@gated-at.bofh.it>
2007-02-15 20:08                           ` Bodo Eggert
2007-02-16 11:21                             ` Sergei Organov
2007-02-16 14:51                               ` Bodo Eggert
2007-02-19 11:56                                 ` Sergei Organov
2007-02-16 12:46                             ` Sergei Organov
2007-02-16 17:40                               ` Bodo Eggert
2007-02-19 12:17                                 ` Sergei Organov

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=87veibqsdf.fsf@javad.com \
    --to=osv@javad.com \
    --cc=jengelh@linux01.gwdg.de \
    --cc=linux-kernel@vger.kernel.org \
    --subject='Re: somebody dropped a (warning) bomb' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).