strcmp is not working in KDS

[kayathrim]

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

[BlackNight]

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

[kayathrim]

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

[BlackNight · Accepted solution]

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