topic Re: strcmp is not working in KDS in Kinetis Design Studio

strcmp is not working in KDS

kayathrim — Thu, 25 Feb 2016 08:01:05 GMT

Hi all,

I am using KDS3.0 without Processor Expert and SDK in K22 family.

In this strcmp is not returning proper value even source destination strings are same.

What is the problem?

Regards,

Kayathri

Re: strcmp is not working in KDS

BlackNight — Thu, 25 Feb 2016 08:09:13 GMT

Hi Kayathri,

can you provide an example of what you are doing?

And: have you included the header already, like with

#include <string.h>

I hope this helps,

Erich

Re: strcmp is not working in KDS

kayathrim — Thu, 25 Feb 2016 08:33:25 GMT

Hi Erich,

i have included <string.h>

below are my function

//strcmp test

char f_check[256];

char buf_data[256];

int true1=0;

int false1=0;

int i = 5; //assigned simply to chech the strcmp return value

char f_check[256];

memset(f_check,0x41,sizeof(f_check));

memset(buf_data,0x41,sizeof(buf_data));

// upto here i vaue is 5

i = strcmp(f_check,buf_data);

// now i =5

if(i==0)

{

true1++;

}

else

{

control comes here

false1++;

}

Regards,

Kayathri

Re: strcmp is not working in KDS

BlackNight — Thu, 25 Feb 2016 09:32:40 GMT

Hi Kayathri,

you have a few problems (or bugs, actually) in your code:

- you are using three large arrays (3x256 bytes) local to your function. If you have not allocated enough stack, this will be a problem.

- you are defining f_check[] twice.

- but the real problem is: strcmp() compares the strings up to a zero terminating byte. You don't have that as you initialize the buffers with a pattern, but you don't set the terminating character. I suggest you either fix that, or you are using strncmp() instead.

I hope this makes the problem clear and helps,

Erich