atoi() check

atoi() check

[Deshpande Bansidhar(IFIN DC AI)]

Hi all

I have following code.
I want to add error handler for atoi() function.

E.g. 

char *ch;
int num;

/*Read ch here*/

Num = atoi(ch);

But before calling atoi I want to make sure that ch is pointing to numberic
string. 
How should I do this. I can manually write some function to check this. But
is there
Any library function inbuilt to achieve the same ? 

Thanks & regards,
Bansidhar A. Deshpande
Software Engineer 
Infineon Technologies India Pvt. Ltd. 
Discoverer Building. 
I.T.P.L., White Field Road, 
Bangalore -560066 
Phone: +91-80-51392011   Extn : 2066
Fax: +91-80-8410012


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Re: atoi() check

[Liguo Song]

Deshpande Bansidhar(IFIN DC AI) wrote:

>Hi all
>
>I have following code.
>I want to add error handler for atoi() function.
>
>E.g. 
>
>char *ch;
>int num;
>
>/*Read ch here*/
>
>Num = atoi(ch);
>
>But before calling atoi I want to make sure that ch is pointing to numberic
>string. 
>How should I do this. I can manually write some function to check this. But
>is there
>Any library function inbuilt to achieve the same ? 
>
>  
>
How about using strtod instead? It seems to be able to give meaningful 
respond regarding the validity of the string.

Just my 2c.


Liguo (Leo)



>Thanks & regards,
>Bansidhar A. Deshpande
>Software Engineer 
>Infineon Technologies India Pvt. Ltd. 
>Discoverer Building. 
>I.T.P.L., White Field Road, 
>Bangalore -560066 
>Phone: +91-80-51392011   Extn : 2066
>Fax: +91-80-8410012
>
>
>*Disclaimer*
>This e-mail and any attachments are confidential and may be subject to legal
>or some other professional privilege. They are intended solely for the
>attention and use of the named addressee(s). They must not be disclosed to
>any person without authorization. This e-mail and any attachments are also
>subject to copyright. They may only be copied or distributed with the
>consent of the copyright owner. If you are not a named addressee you must
>not use, disclose, retain or reproduce all or any part of the information
>contained in this e-mail or any attachments. If you have received this email
>by mistake please notify the sender immediately by return email and delete
>or destroy all copies of the email. Any confidentiality, privilege or
>copyright is not waived or lost because this email has been sent to you by
>mistake.
>
>
>
>  
>

Re: atoi() check

[Ishwar Rattan]

On Wed, 28 Jan 2004, Liguo Song wrote:

> Deshpande Bansidhar(IFIN DC AI) wrote:
>
> >Hi all
> >
> >I have following code.
> >I want to add error handler for atoi() function.
> >
> >E.g.
> >
> >char *ch;
> >int num;
> >
> >/*Read ch here*/
> >
> >Num = atoi(ch);
   ^
   n
and
atoi() returns error when it fails, take the time to trap it.

HTH
-ishwar

RE: atoi() check

[Assinovsky, Lev]

As far as I know there are no builtin functions
for atoi. You can use regex function set to make sure your 
string contains at least on digit.
Regular expression: [0-9]+
----
Lev Assinovsky
Aelita Software Corporation


> -----Original Message-----
> From: Deshpande Bansidhar(IFIN DC AI)
> [mailto:Bansidhar.Deshpande@infineon.com]
> Sent: Wednesday, January 28, 2004 9:11 AM
> To: 'gcc-help@gcc.gnu.org'
> Subject: atoi() check 
> 
> 
> Hi all
> 
> I have following code.
> I want to add error handler for atoi() function.
> 
> E.g. 
> 
> char *ch;
> int num;
> 
> /*Read ch here*/
> 
> Num = atoi(ch);
> 
> But before calling atoi I want to make sure that ch is 
> pointing to numberic
> string. 
> How should I do this. I can manually write some function to 
> check this. But
> is there
> Any library function inbuilt to achieve the same ? 
> 
> Thanks & regards,
> Bansidhar A. Deshpande
> Software Engineer 
> Infineon Technologies India Pvt. Ltd. 
> Discoverer Building. 
> I.T.P.L., White Field Road, 
> Bangalore -560066 
> Phone: +91-80-51392011   Extn : 2066
> Fax: +91-80-8410012
> 
> 
> *Disclaimer*
> This e-mail and any attachments are confidential and may be 
> subject to legal
> or some other professional privilege. They are intended solely for the
> attention and use of the named addressee(s). They must not be 
> disclosed to
> any person without authorization. This e-mail and any 
> attachments are also
> subject to copyright. They may only be copied or distributed with the
> consent of the copyright owner. If you are not a named 
> addressee you must
> not use, disclose, retain or reproduce all or any part of the 
> information
> contained in this e-mail or any attachments. If you have 
> received this email
> by mistake please notify the sender immediately by return 
> email and delete
> or destroy all copies of the email. Any confidentiality, privilege or
> copyright is not waived or lost because this email has been 
> sent to you by
> mistake.
> 
> 
> 
> 
>