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Re: What standard library functions must deal with allocated memory?

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Stephen Sprunk wrote:
> 
> On 24-Apr-12 02:38, Malcolm McLean wrote:
> > בתאריך יום ×©× ×™, 23 באפריל 2012 19:01:49 UTC+1, מאת Francois Grieu:
> >> I'm trying to list all the standard
> >> C99/C2011 library functions that, by
> >> design, must deal with allocated memory in any way.
> >>
> >> I've seen calloc malloc realloc free. Is there any other?
> >> If strdup was a standard function (it is not),
> >> it would be in my list.
> >
> > None of them, except for malloc(), realloc() and free() themselves.
> >
> > This appears to have been a deliberate design decision.
> > strdup() is an obvious candidate for a library function,
> > but including it would make
> > the string library dependent on an allocation
> > package being available.
> 
> I thought it was a combination of wanting memory-allocation
> functions to be clearly identifiable as such
> and avoiding functions that were trivial
> combinations of other primitive functions already provided.

There's already at least a couple of string functions which are 
trivial combinations of other primitive functions already provided.

char *
strcat(char *s1, const char *s2)
{
    strcpy(strlen(s1) + s1, s2);
    return s1;
}

char *
strpbrk(const char *s1, const char *s2)
{
    s1 += strcspn(s1, s2);
    return *s1 != '\0' ? (char *)s1 : NULL;
}

There's also some trivial repackaging declared in stdio.h

int 
vprintf(const char *format, va_list arg)
{
    return vfprintf(stdout, format, arg);
}

and also declared in ctype.h

int 
isalpha(int c) 
{
    return islower(c) || isupper(c);
}

int 
isalnum(int c) 
{
    return isdigit(c) || isalpha(c);
}

-- 
pete

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Thread

What standard library functions must deal with allocated memory? Francois Grieu <fgrieu@gmail.com> - 2012-04-23 20:01 +0200
  Re: What standard library functions must deal with allocated memory? James Kuyper <jameskuyper@verizon.net> - 2012-04-23 14:17 -0400
    Re: What standard library functions must deal with allocated memory? Francois Grieu <fgrieu@gmail.com> - 2012-04-23 20:37 +0200
  Re: What standard library functions must deal with allocated memory? Barry Schwarz <schwarzb@dqel.com> - 2012-04-23 12:26 -0700
    Re: What standard library functions must deal with allocated memory? Keith Thompson <kst-u@mib.org> - 2012-04-23 14:04 -0700
      Re: What standard library functions must deal with allocated memory? Robert Wessel <robertwessel2@yahoo.com> - 2012-04-23 17:15 -0500
    Re: What standard library functions must deal with allocated memory? Francois Grieu <fgrieu@gmail.com> - 2012-04-23 23:18 +0200
      Re: What standard library functions must deal with allocated memory? Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-04-23 21:55 -0400
        Re: What standard library functions must deal with allocated memory? Quentin Pope <nospam@nospam.invalid> - 2012-04-24 02:07 +0000
          Re: What standard library functions must deal with allocated memory? Dr Nick <3-nospam@temporary-address.org.uk> - 2012-04-24 07:05 +0100
  Re: What standard library functions must deal with allocated memory? Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-04-24 00:38 -0700
    Re: What standard library functions must deal with allocated memory? Keith Thompson <kst-u@mib.org> - 2012-04-24 22:24 -0700
      Re: What standard library functions must deal with allocated memory? pete <pfiland@mindspring.com> - 2012-04-25 08:04 -0400
      Re: What standard library functions must deal with allocated memory? Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-04-28 04:09 -0700
    Re: What standard library functions must deal with allocated memory? Stephen Sprunk <stephen@sprunk.org> - 2012-04-25 01:19 -0500
      Re: What standard library functions must deal with allocated memory? pete <pfiland@mindspring.com> - 2012-04-25 07:55 -0400
  Re: What standard library functions must deal with allocated memory? gordonb.ho66c@burditt.org (Gordon Burditt) - 2012-04-27 20:44 -0500

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