usr/src/lib/libc/string/strncat.c

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Chris Torek.
 *
 * %sccs.include.redist.c%
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)strncat.c   5.6 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/cdefs.h>
#include <string.h>

/*
 * Concatenate src on the end of dst.  At most strlen(dst)+n+1 bytes
 * are written at dst (at most n+1 bytes being appended).  Return dst.
 */
char *
strncat(dst, src, n)
        char *dst;
        const char *src;
        register size_t n;
{
        if (n != 0) {
                register char *d = dst;
                register const char *s = src;

                while (*d != 0)
                        d++;
                do {
                        if ((*d = *s++) == 0)
                                break;
                        d++;
                } while (--n != 0);
                *d = 0;
        }
        return (dst);
}