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Help parsing a string

 
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Joined: 30 Nov 2008
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Help parsing a string
PostPosted: Fri Apr 03, 2009 8:27 pm     Reply with quote
I have a project that has an SDCARD. I have a FAT file system. I need to open a text file and read in some values.

I have all the file stuff working and I can read in strings, and I can parse the string, the problem is I cannot figure out how to convert the string value to hex.

Here is my sample code.
Code:

while (readln(&fdata,linein,63))
{
strcpy (temp_str, "\0");
strncpy (temp_str, linein + 5 ,  4);
strcpy (temp_str + 4, "\0");
//Copy up to n characters s2->s1
EM_Timer_Settings[Loop_Counter] = atoi(temp_str);

The atoi func works if my number has hex chars. But if no hex chars, it converts the string to decimal.

what is the best way to convert a 4 char string to hex?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Apr 03, 2009 9:12 pm     Reply with quote
atoi() expects to see a "0x" in front of a string, to identify it as hex.

Or, you can make a copy of the source code for atoi() and edit it, so that
it operates only on hex strings. (And give it a new function name).

Or you can write your own function to do it. Example:
http://www.ccsinfo.com/forum/viewtopic.php?t=35175&start=2
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