strncat bound check

gistfile1.c

#include "stdio.h"

#define MAXBUF 10

int main(int argc, char **argv)
{
    char buf[MAXBUF];           // enough room for 9 characters and one '\0'
    
    strcpy(buf,"hello ");       // use 6 characters

    strncat(buf, "world!\n", 3);// Strncat() wants the maximum number
                                // of characters it can copy (not counting the 
                                // terminating null). In this case, there are 3 
                                // free characters left in buf.
                                // The length passed to strncat() would
                                // typically be equivalent to 
                                // MAXBUF-1-strlen(buf).
    printf("%s\n", buf)
    return 0;
}