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Re: Alternative libraries for C, that are efficient

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Am 04/12/2012 06:01 PM, schrieb John Reye:
> recently I learned that various "standard C library" functions have
> deficiencies in terms of high performance.
> Examples include the return values of fgets(), strcpy(), strcat()
> (thanks Eric Sosman for mentioning the last 2)
> 
> Example:            char * strcat ( char * destination, const char *
> source );
> Return Value:     destination is returned.
> 
> How useless is that!

very useful for constructs such as

char const* s = strcat(strcpy(malloc(100), "Hello "), "world");

or

char const* t = strcat((char[100]){ "Hello " }, s);


> I already know the distination, in the first place.

No, not necessarily. The first argument is an expression. This feature
avoids to evaluate that expression multiple times.

Your mileage just varies from that of the C library designers.

Jens

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Alternative libraries for C, that are efficient John Reye <jononanon@googlemail.com> - 2012-04-12 09:01 -0700
  Re: Alternative libraries for C, that are efficient John Reye <jononanon@googlemail.com> - 2012-04-12 09:05 -0700
    Re: Alternative libraries for C, that are efficient ImpalerCore <jadill33@gmail.com> - 2012-04-12 09:38 -0700
      Re: Alternative libraries for C, that are efficient John Reye <jononanon@googlemail.com> - 2012-04-12 11:32 -0700
        Re: Alternative libraries for C, that are efficient James Kuyper <jameskuyper@verizon.net> - 2012-04-12 14:41 -0400
          Re: Alternative libraries for C, that are efficient Willem <willem@toad.stack.nl> - 2012-04-12 18:51 +0000
            Re: Alternative libraries for C, that are efficient nick_keighley_nospam@hotmail.com - 2012-04-13 03:46 -0700
              Re: Alternative libraries for C, that are efficient Willem <willem@toad.stack.nl> - 2012-04-13 14:51 +0000
            Re: Alternative libraries for C, that are efficient Kenneth Brody <kenbrody@spamcop.net> - 2012-04-13 12:38 -0400
              Re: Alternative libraries for C, that are efficient Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2012-04-15 19:47 +0300
  Re: Alternative libraries for C, that are efficient tom st denis <tom@iahu.ca> - 2012-04-12 09:09 -0700
    Re: Alternative libraries for C, that are efficient John Reye <jononanon@googlemail.com> - 2012-04-12 11:13 -0700
      Re: Alternative libraries for C, that are efficient tom st denis <tom@iahu.ca> - 2012-04-12 18:20 -0700
  Re: Alternative libraries for C, that are efficient Jens Gustedt <jens.gustedt@loria.fr> - 2012-04-12 18:13 +0200
    Re: Alternative libraries for C, that are efficient James Kuyper <jameskuyper@verizon.net> - 2012-04-12 12:47 -0400
    Re: Alternative libraries for C, that are efficient John Reye <jononanon@googlemail.com> - 2012-04-12 11:22 -0700
      Re: Alternative libraries for C, that are efficient Jens Gustedt <jens.gustedt@loria.fr> - 2012-04-13 22:37 +0200
        Re: Alternative libraries for C, that are efficient Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2012-04-15 20:15 +0300
          Re: Alternative libraries for C, that are efficient Jens Gustedt <jens.gustedt@loria.fr> - 2012-04-15 23:30 +0200
  Re: Alternative libraries for C, that are efficient Ben Pfaff <blp@cs.stanford.edu> - 2012-04-12 09:20 -0700
  Re: Alternative libraries for C, that are efficient Noob <root@127.0.0.1> - 2012-04-12 18:34 +0200
    Re: Alternative libraries for C, that are efficient Kaz Kylheku <kaz@kylheku.com> - 2012-04-12 18:00 +0000
      Re: Alternative libraries for C, that are efficient nick_keighley_nospam@hotmail.com - 2012-04-13 03:50 -0700
    Re: Alternative libraries for C, that are efficient John Reye <jononanon@googlemail.com> - 2012-04-12 11:24 -0700
      Re: Alternative libraries for C, that are efficient Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-04-12 13:08 -0700
  Re: Alternative libraries for C, that are efficient James Kuyper <jameskuyper@verizon.net> - 2012-04-12 12:50 -0400
    Re: Alternative libraries for C, that are efficient John Reye <jononanon@googlemail.com> - 2012-04-12 11:30 -0700
      Re: Alternative libraries for C, that are efficient James Kuyper <jameskuyper@verizon.net> - 2012-04-12 15:55 -0400
  Re: Alternative libraries for C, that are efficient Barry Schwarz <schwarzb@dqel.com> - 2012-04-12 11:41 -0700
    Re: Alternative libraries for C, that are efficient Willem <willem@toad.stack.nl> - 2012-04-12 19:08 +0000
  Re: Alternative libraries for C, that are efficient "BartC" <bc@freeuk.com> - 2012-04-12 21:07 +0100
    Re: Alternative libraries for C, that are efficient James Kuyper <jameskuyper@verizon.net> - 2012-04-12 20:35 -0400
      Re: Alternative libraries for C, that are efficient "BartC" <bc@freeuk.com> - 2012-04-13 11:38 +0100
        Re: Alternative libraries for C, that are efficient James Kuyper <jameskuyper@verizon.net> - 2012-04-13 09:52 -0400
          Re: Alternative libraries for C, that are efficient "BartC" <bc@freeuk.com> - 2012-04-13 17:56 +0100
      Re: Alternative libraries for C, that are efficient Kenneth Brody <kenbrody@spamcop.net> - 2012-04-13 12:56 -0400
        Re: Alternative libraries for C, that are efficient James Kuyper <jameskuyper@verizon.net> - 2012-04-13 14:48 -0400
          Re: Alternative libraries for C, that are efficient Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-04-14 07:22 -0700
  Re: Alternative libraries for C, that are efficient Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-04-12 21:23 -0400
    Re: Alternative libraries for C, that are efficient Quentin Pope <qp19433@hotmail.NOSPAM.com> - 2012-04-13 16:52 +0000
  Re: Alternative libraries for C, that are efficient Jens Gustedt <jens.gustedt@loria.fr> - 2012-04-13 23:24 +0200

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