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URGENT: strtol and pointers problems

 
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sprotch



Joined: 29 Sep 2005
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URGENT: strtol and pointers problems
PostPosted: Wed Nov 23, 2005 2:40 pm     Reply with quote
Hi all!
In a program for my diploma project I want use the strtol function which extract a long from a string. Regarding to CCS Compiler reference manual the following code should give result = 123 and ptr = "hello"
Code:
signed long result;
char str[2]="123hello";
char *ptr;
result=strtol(str,&ptr,10);


Two questions about this example:
1. str is declared to be 2 of length should it not be 9 for avoiding overwrite?
2. This example works well if str is stored in lower adresses (<255). If str is stored for example at adress 0x100 ptr should be 0x0103 but is 0x0003 in reality as if only lower byte was copied... Is this a problem of 8 bit or 16 bit pointers? Should a char **ptr (double indirection) be used as in standard C strtol?
I'm using a PIC18F452 with #device *=16 directive and CCS 3.239.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Nov 23, 2005 3:22 pm     Reply with quote
I made a test program based on your post and I did see a problem.
Maybe you should report this to CCS.

As a work-around, you can use the adtol() function
("ASCII decimal to long") shown in the following thread.
Or you can modify it as needed.
http://www.ccsinfo.com/forum/viewtopic.php?t=17563&highlight=adtol
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