Passing int to sysfs

I want to pass int to sysfs_store

What I tried

userspace

int tid = 5234; // can be negative as wellchar buf[5];sprintf(buf, "%d\n", tid);write (fd, buf, 1);

driver sysfs_store

int v;kstrtoint(buf,10,&v);pr_info("%d\n",v); // printing only first digit 5. Should print 5234