strncat.c

Many C samples. It is a good sample for students to learn C language.

/*  File   : strncat.c
    Author : Richard A. O'Keefe.
    Updated: 20 April 1984
    Defines: strncat()

    strncat(dst, src, n)  copies up to n characters of src to the end of
    dst.   As with strcat, it has to search for the end of dst.  Even if
    it abandons src early because n runs out it  will  still  close  dst
    with a NUL.  See also strnmov.
*/

#include "strings.h"

char *strncat(dst, src, n)
    register char *dst, *src;
    register int n;
    {
	char *save;

	for (save = dst; *dst++; ) ;
	for (--dst; --n >= 0; )
	    if (!(*dst++ = *src++)) return save;
	*dst = NUL;
	return save;
    }