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Groups > comp.lang.c > #101985

Re: Program to check for valid names

From Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups comp.lang.c
Subject Re: Program to check for valid names
Date 2017-01-16 17:17 +0000
Organization A noiseless patient Spider
Message-ID <87wpduhqls.fsf@bsb.me.uk> (permalink)
References (9 earlier) <4ae98115-b764-4b96-8929-670781347b7e@googlegroups.com> <o5in9l$90n$1@dont-email.me> <0303faae-cbb2-4dc7-a5e2-67e116628712@googlegroups.com> <o5it31$urk$1@dont-email.me> <13d9eec0-fb8b-4530-99c0-7da1d8ca402a@googlegroups.com>

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Alla _ <modelling.data@gmail.com> writes:

> On Monday, January 16, 2017 at 7:42:52 PM UTC+3, Richard Heathfield wrote:
>> On 16/01/17 16:29, Alla _ wrote:
>> > On Monday, January 16, 2017 at 6:03:56 PM UTC+3, Richard Heathfield wrote:
<snip>
>> >> char *token = skipleadingspaces(line);
>> >>
>> >> or whatever. Then you *know* that free(line); will work fine at the end.
>> >>
>> > Done. The first version above, because if I use char *token =
>> > skipleadingspaces(line);
>> > I'd still need to "rewind" line back to the beginning,
>> 
>> Why?
>> 
>> This is a REALLY IMPORTANT QUESTION, and it seems to me that it probably 
>> betrays a fundamental misunderstanding on your point of a vital part of 
>> C programming.
>> So: WHY do you think this?

The question is was about your concern over this code:

  char *token = skipleadingspaces(line);

after which a call of free(line) is safe and correct, but your reply is
about this code

> line = skip_spaces(line);

after which it is not safe to free(line).

<snip>
-- 
Ben.

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Thread

Program to check for valid names Alla _ <modelling.data@gmail.com> - 2017-01-14 04:35 -0800
  Re: Program to check for valid names Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-14 15:02 +0000
    Re: Program to check for valid names Alla _ <modelling.data@gmail.com> - 2017-01-14 07:29 -0800
      Re: Program to check for valid names supercat@casperkitty.com - 2017-01-14 10:17 -0800
      Re: Program to check for valid names Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-14 18:29 +0000
        Re: Program to check for valid names Alla _ <modelling.data@gmail.com> - 2017-01-16 02:16 -0800
          Re: Program to check for valid names Richard Heathfield <rjh@cpax.org.uk> - 2017-01-16 11:40 +0000
            Re: Program to check for valid names Alla _ <modelling.data@gmail.com> - 2017-01-16 03:50 -0800
              Re: Program to check for valid names Alla _ <modelling.data@gmail.com> - 2017-01-16 04:21 -0800
                Re: Program to check for valid names Richard Heathfield <rjh@cpax.org.uk> - 2017-01-16 12:56 +0000
                Re: Program to check for valid names Richard Heathfield <rjh@cpax.org.uk> - 2017-01-16 12:59 +0000
                Re: Program to check for valid names Alla _ <modelling.data@gmail.com> - 2017-01-16 05:03 -0800
                Re: Program to check for valid names Richard Heathfield <rjh@cpax.org.uk> - 2017-01-16 13:06 +0000
                Re: Program to check for valid names Alla _ <modelling.data@gmail.com> - 2017-01-16 06:40 -0800
                Re: Program to check for valid names Richard Heathfield <rjh@cpax.org.uk> - 2017-01-16 15:03 +0000
                Re: Program to check for valid names Alla _ <modelling.data@gmail.com> - 2017-01-16 08:29 -0800
                Re: Program to check for valid names Richard Heathfield <rjh@cpax.org.uk> - 2017-01-16 16:42 +0000
                Re: Program to check for valid names Alla _ <modelling.data@gmail.com> - 2017-01-16 09:03 -0800
                Re: Program to check for valid names Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-16 17:17 +0000
                Re: Program to check for valid names Richard Heathfield <rjh@cpax.org.uk> - 2017-01-16 17:20 +0000
                Re: Program to check for valid names Alla _ <modelling.data@gmail.com> - 2017-01-16 09:26 -0800
                Re: Program to check for valid names Richard Heathfield <rjh@cpax.org.uk> - 2017-01-16 17:18 +0000
                Re: Program to check for valid names Alla _ <modelling.data@gmail.com> - 2017-01-16 09:23 -0800
                Re: Program to check for valid names Richard Heathfield <rjh@cpax.org.uk> - 2017-01-16 17:30 +0000
                Re: Program to check for valid names Alla _ <modelling.data@gmail.com> - 2017-01-16 06:42 -0800
                Re: Program to check for valid names Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-16 16:23 +0000
                Re: Program to check for valid names Alla _ <modelling.data@gmail.com> - 2017-01-16 08:46 -0800
                Re: Program to check for valid names Alla _ <modelling.data@gmail.com> - 2017-01-16 09:33 -0800
                Re: Program to check for valid names Richard Heathfield <rjh@cpax.org.uk> - 2017-01-16 17:37 +0000
                Re: Program to check for valid names Alla _ <modelling.data@gmail.com> - 2017-01-16 09:54 -0800
                Re: Program to check for valid names Alla _ <modelling.data@gmail.com> - 2017-01-17 03:44 -0800
                Re: Program to check for valid names Barry Schwarz <schwarzb@dqel.com> - 2017-01-17 08:16 -0800
                Re: Program to check for valid names Alla _ <modelling.data@gmail.com> - 2017-01-18 10:21 -0800
                Re: Program to check for valid names Alla _ <modelling.data@gmail.com> - 2017-01-18 10:32 -0800
                Re: Program to check for valid names Richard Heathfield <rjh@cpax.org.uk> - 2017-01-18 19:38 +0000
                Re: Program to check for valid names Alla _ <modelling.data@gmail.com> - 2017-01-18 12:52 -0800
                Re: Program to check for valid names Barry Schwarz <schwarzb@dqel.com> - 2017-01-18 18:52 -0800
                Re: Program to check for valid names Alla _ <modelling.data@gmail.com> - 2017-01-20 02:00 -0800
                Re: Program to check for valid names Barry Schwarz <schwarzb@dqel.com> - 2017-01-20 12:09 -0800
                Re: Program to check for valid names Alla _ <modelling.data@gmail.com> - 2017-01-20 02:45 -0800
                Re: Program to check for valid names Barry Schwarz <schwarzb@dqel.com> - 2017-01-20 12:24 -0800
                Re: Program to check for valid names Alla _ <modelling.data@gmail.com> - 2017-01-21 09:02 -0800
                Re: Program to check for valid names Barry Schwarz <schwarzb@dqel.com> - 2017-01-18 18:05 -0800
                Re: Program to check for valid names Barry Schwarz <schwarzb@dqel.com> - 2017-01-16 10:23 -0800
                Re: Program to check for valid names Alla _ <modelling.data@gmail.com> - 2017-01-16 23:03 -0800
                Re: Program to check for valid names Barry Schwarz <schwarzb@dqel.com> - 2017-01-17 00:19 -0800
  Re: Program to check for valid names Barry Schwarz <schwarzb@dqel.com> - 2017-01-14 18:23 -0800

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