NetNews Offline 2/NetNews Offline Volume 2.iso/news/comp/lang/c-part2/10492

Internet Message Format | 1996-08-05 | 3.7 KB

Path: rcp6.elan.af.mil!rscernix!danpop
From: [e-mail] (Dan Pop)
Newsgroups: comp.lang.c
Subject: Re: Help !!!!! on 'strstr"
Date: 14 Mar 96 18:07:32 GMT
Organization: CERN European Lab for Particle Physics
Message-ID: <danpop.826826852@rscernix>
References: <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: ues5.cern.ch
X-Newsreader: NN version 6.5.0 #7 (NOV)

In <[e-mail]> Steve Fogoros <[e-mail]> writes:

>Tanmoy Bhattacharya wrote:
>
>> Any user function whose name begins with `is' followed by a lower case
>> letter violates the ANSI C standard.
>
>You mentioned the same kind of violation regarding user functions that start with
>'str' followed by lower case letter in another post. I apologize that I question
>this without being intimately familiar with ANSI C Standard. I am having a hard time
>believing the standard would consider my use of other than reserved words a violation.
>(What kind of ticket would I get for an infraction? Is the implementation required to
>check for this and warn or error?)

No.  This kind of "infraction" invokes undefined behaviour and the
compiler is free to do anything it wants.

>Seriously, I will look this up because it seems strange to me and I didn't know
>anything about it. I quick scanned my K&R2 but did not find anything there.

Here's the complete list of reserved external names.

    4.13 FUTURE LIBRARY DIRECTIONS

       The following names are grouped under individual headers for
    convenience.  All external names described below are reserved no
    matter what headers are included by the program.     ^^^^^^^^


    4.13.1 Errors <errno.h>

       Macros that begin with E and a digit or E and an upper-case letter
    (followed by any combination of digits, letters and underscore) may be
    added to the declarations in the <errno.h> header.


    4.13.2 Character handling <ctype.h>

       Function names that begin with either is or to , and a lower-case
    letter (followed by any combination of digits, letters and underscore)
    may be added to the declarations in the <ctype.h> header.


    4.13.3 Localization <locale.h>

       Macros that begin with LC_ and an upper-case letter (followed by
    any combination of digits, letters and underscore) may be added to the
    definitions in the <locale.h> header.


    4.13.4 Mathematics <math.h>

       The names of all existing functions declared in the <math.h>
    header, suffixed with f or l , are reserved respectively for
    corresponding functions with float and long double arguments and
    return values.


    4.13.5 Signal handling <signal.h>

       Macros that begin with either SIG and an upper-case letter or SIG_
    and an upper-case letter (followed by any combination of digits,
    letters and underscore) may be added to the definitions in the
    <signal.h> header.


    4.13.6 Input/output <stdio.h>

       Lower-case letters may be added to the conversion specifiers in
    fprintf and fscanf .  Other characters may be used in extensions.


    4.13.7 General utilities <stdlib.h>

       Function names that begin with str and a lower-case letter
    (followed by any combination of digits, letters and underscore) may be
    added to the declarations in the <stdlib.h> header.


    4.13.8 String handling <string.h>

       Function names that begin with str , mem , or wcs and a lower-case
    letter (followed by any combination of digits, letters and underscore)
    may be added to the declarations in the <string.h> header.

Dan
--
Dan Pop
CERN, CN Division
Email: [e-mail]
Mail:  CERN - PPE, Bat. 31 R-004, CH-1211 Geneve 23, Switzerland