copy one string to another string up to some no of characters

[yakubpasha]

char* category;//i'll pass some string using function
for( i=0;i<noOfRecords;i++){
char string[30];
char* mystring;
size_t len=strlen(category);
strcpy(mystring,category,len-1);
sprintf(string,"%s",labValueRecords->category);

labValueRecords++;
if(strcmp(string,mystring)==0){
count++;
}
}



when i run this it giving an error like
The variable 'mystring' is being used without being initialized.




plz help me
thanks
regards yakub

[firedraco]

mystring is a pointer to random memory, which may or may not be writable, so when you use strcpy() and try to copy to it, you could be writing to invalid memory.

[yakubpasha]

thank you dude ...