K&R Exercise 5-5, strncat

kr5-5-strncat.c

#include <stdio.h>

void strnfeline(char *s, const char *t, int n);

void strnfeline(char *s, const char *t, int n)
{
    //this is bad if s is not terminated
    while(*++s)
        ;
    while(n--)
        *s++ = *t++;
    *s = '\0';
}

int main()
{
    char glee[40] = "Glee is";
    char quality[] = " badass";
    strnfeline(glee, quality, 4);
    printf("%s\n", glee);
    return 0;
}