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atoi() question

 
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dbotkin



Joined: 08 Sep 2003
Posts: 197
Location: Omaha NE USA

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atoi() question
PostPosted: Fri May 08, 2009 12:56 pm     Reply with quote
From the CCS C manual:

Quote:
Converts the string passed to the function into an int representation. Accepts both decimal and hexadecimal argument.


It seems to work fine with decimal strings, but not hex. If I give it a string containing hex digits (like FF) it returns 0. Anyone know any different?
Steve H
Guest
PostPosted: Fri May 08, 2009 1:32 pm     Reply with quote
The function is 'inspectable' look at the include header file.

As I recall the HEX has to be in C notation.

e.g. :

"5F" will not work

"0x5F" will work

HTH - Steve H.
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Fri May 08, 2009 1:53 pm     Reply with quote
Or make a version of atoi that only processes hex chars: axtoi()
http://www.ccsinfo.com/forum/viewtopic.php?t=35175&start=2
Guest
PostPosted: Mon May 11, 2009 1:17 pm     Reply with quote
Oh wow - I went looking for atoi() myself today for another project and only the prototype is on the stdlib.h file now (V4.xxx) - the full function used to be in version 3x.

I thought I was losing my mind - as I could remember seeing it!

No matter - just google atoi() and you will find out how it is done or to use as a base for your own function as PCM suggested....

It is a typical C function - very compact and efficient....

Steve H.
PCM programmer



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Posts: 21708

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PostPosted: Mon May 11, 2009 1:40 pm     Reply with quote
Quote:
only the prototype is on the stdlib.h file now (V4.xxx)

I looked in stdlib.h in vs. 4.092 and the full source is in there.
It starts at line 429. It looks like this:
Code:
signed int atoi(char *s)
{
   signed int result;
   unsigned int sign, base, index;
   char c;
Guest
PostPosted: Mon May 11, 2009 10:04 pm     Reply with quote
Oh - so I am loosing my mind! I just needed to look farther down! You are right the atoi() source is still 'Inspectale'

:-)

Thanks for pointing that out...

Steve H.
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