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Groups > comp.lang.c > #141737
| From | Tim Rentsch <tr.17687@z991.linuxsc.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: Safer and more convenient strcpy() |
| Date | 2019-03-06 09:12 -0800 |
| Organization | A noiseless patient Spider |
| Message-ID | <86sgw0sz9c.fsf@mailhub.linuxsc.com> (permalink) |
| References | <0c54f650-7ece-4120-9ca4-c59972d8971a@googlegroups.com> <6e60c0ba-bc6e-4be9-893e-de64f538c495@googlegroups.com> <89a3104f-6b3b-42c7-9571-2969d25ff248@googlegroups.com> |
Howard Chu <highlandsun@gmail.com> writes:
> On Wednesday, March 6, 2019 at 11:58:29 AM UTC, Malcolm McLean wrote:
>
>> On Wednesday, 6 March 2019 11:45:24 UTC, Howard Chu wrote:
>>
>>> I was recently reminded of an old rant of mine, which reminded me of
>>> the even older discussion about better versions of strcpy().
>>>
>>> https://www.openldap.org/lists/openldap-software/200303/msg00560.html
>>>
>>> The function I advocated there eventually became more common, known as
>>> stpcpy(), but it's still not a safer function. It's easy to write a safer
>>> function that's still convenient to use though, like so:
>>>
>>> char *stecpy(char *dst, const char *src, const char *end)
>>> {
>>> while (*src && dst < end)
>>> *dst++ = *src++;
>>> if (dst < end)
>>> *dst = '\0';
>>> return dst;
>>> }
>>
>> If the buffer is too small to fit the string, it is not nul-terminated.
>> So you'll likely get a crash when you try to use the string. Better
>> to lose a character and nul-terminate.
>
> I suppose. [...]
I would say not. If it's important to the caller to
that null termination be guaranteed, this is easily
done by putting a null byte at the end of the buffer
and giving an 'end' pointer one less.
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Safer and more convenient strcpy() Howard Chu <highlandsun@gmail.com> - 2019-03-06 03:45 -0800
Re: Safer and more convenient strcpy() Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2019-03-06 03:58 -0800
Re: Safer and more convenient strcpy() Howard Chu <highlandsun@gmail.com> - 2019-03-06 04:31 -0800
Re: Safer and more convenient strcpy() "I Set My Girlfriend's Pantyhose on Fire" <cdalten@gmail.com> - 2019-03-06 05:18 -0800
Re: Safer and more convenient strcpy() Howard Chu <highlandsun@gmail.com> - 2019-03-06 13:03 -0800
Re: Safer and more convenient strcpy() William Ahern <william@25thandClement.com> - 2019-03-06 16:51 -0800
Re: Safer and more convenient strcpy() Howard Chu <highlandsun@gmail.com> - 2019-03-07 07:40 -0800
Re: Safer and more convenient strcpy() scott@slp53.sl.home (Scott Lurndal) - 2019-03-07 16:12 +0000
Re: Safer and more convenient strcpy() Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2019-03-07 08:28 -0800
Re: Safer and more convenient strcpy() scott@slp53.sl.home (Scott Lurndal) - 2019-03-07 16:51 +0000
Re: Safer and more convenient strcpy() Howard Chu <highlandsun@gmail.com> - 2019-03-07 09:31 -0800
Re: Safer and more convenient strcpy() Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2019-03-07 11:17 -0800
Re: Safer and more convenient strcpy() Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-03-07 22:35 +0000
Re: Safer and more convenient strcpy() Howard Chu <highlandsun@gmail.com> - 2019-03-07 15:32 -0800
Re: Safer and more convenient strcpy() scott@slp53.sl.home (Scott Lurndal) - 2019-03-08 14:29 +0000
Re: Safer and more convenient strcpy() Howard Chu <highlandsun@gmail.com> - 2019-03-08 07:09 -0800
Re: Safer and more convenient strcpy() Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-03-08 15:39 +0000
Re: Safer and more convenient strcpy() Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2019-03-08 07:56 -0800
Re: Safer and more convenient strcpy() Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-03-09 08:12 +0000
Re: Safer and more convenient strcpy() William Ahern <william@25thandClement.com> - 2019-03-07 15:51 -0800
Re: Safer and more convenient strcpy() William Ahern <william@25thandClement.com> - 2019-03-07 16:38 -0800
Re: Safer and more convenient strcpy() Keith Thompson <kst-u@mib.org> - 2019-03-07 18:32 -0800
Re: Safer and more convenient strcpy() William Ahern <william@25thandClement.com> - 2019-03-07 20:00 -0800
Re: Safer and more convenient strcpy() Howard Chu <highlandsun@gmail.com> - 2019-03-08 04:15 -0800
Re: Safer and more convenient strcpy() "I Set My Girlfriend's Pantyhose on Fire" <cdalten@gmail.com> - 2019-03-07 12:15 -0800
Re: Safer and more convenient strcpy() Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-03-06 09:12 -0800
Re: Safer and more convenient strcpy() mark.bluemel@gmail.com - 2019-03-06 08:27 -0800
Re: Safer and more convenient strcpy() Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-03-06 09:22 -0800
Re: Safer and more convenient strcpy() Rosario19 <Ros@invalid.invalid> - 2019-03-07 09:10 +0100
Re: Safer and more convenient strcpy() Rosario19 <Ros@invalid.invalid> - 2019-03-07 09:12 +0100
Re: Safer and more convenient strcpy() mark.bluemel@gmail.com - 2019-03-07 00:55 -0800
Re: Safer and more convenient strcpy() William Ahern <william@25thandClement.com> - 2019-03-07 16:09 -0800
Re: Safer and more convenient strcpy() Howard Chu <highlandsun@gmail.com> - 2019-03-08 04:04 -0800
Re: Safer and more convenient strcpy() eric.sanchis@iut-rodez.fr - 2019-04-15 04:40 -0700
Re: Safer and more convenient strcpy() nobody@example.org (Scott) - 2019-04-16 03:33 +0000
Re: Safer and more convenient strcpy() eric.sanchis@iut-rodez.fr - 2019-04-16 05:35 -0700
Re: Safer and more convenient strcpy() nobody@example.org (Scott) - 2019-04-17 01:19 +0000
Re: Safer and more convenient strcpy() eric.sanchis@iut-rodez.fr - 2019-04-17 05:35 -0700
Re: Safer and more convenient strcpy() nobody@example.org (Scott) - 2019-04-17 16:59 +0000
Re: Safer and more convenient strcpy() eric.sanchis@iut-rodez.fr - 2019-04-17 23:40 -0700
Re: Safer and more convenient strcpy() Philipp Klaus Krause <pkk@spth.de> - 2019-03-20 11:10 +0100
Re: Safer and more convenient strcpy() Philipp Klaus Krause <pkk@spth.de> - 2019-03-20 11:13 +0100
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