FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/lib/libspl/strlcat.c

     /*
      * CDDL HEADER START
      *
      * The contents of this file are subject to the terms of the
      * Common Development and Distribution License (the "License").
      * You may not use this file except in compliance with the License.
      *
      * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      * or https://opensource.org/licenses/CDDL-1.0.
     * See the License for the specific language governing permissions
     * and limitations under the License.
     *
     * When distributing Covered Code, include this CDDL HEADER in each
     * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     * If applicable, add the following below this CDDL HEADER, with the
     * fields enclosed by brackets "[]" replaced with your own identifying
     * information: Portions Copyright [yyyy] [name of copyright owner]
     *
     * CDDL HEADER END
     */
    
    /*
     * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     * Use is subject to license terms.
     */
    #ifndef HAVE_STRLCAT
    
    #include <string.h>
    #include <sys/types.h>
    
    /*
     * Appends src to the dstsize buffer at dst. The append will never
     * overflow the destination buffer and the buffer will always be null
     * terminated. Never reference beyond &dst[dstsize-1] when computing
     * the length of the pre-existing string.
     */
    
    size_t
    strlcat(char *dst, const char *src, size_t dstsize)
    {
            char *df = dst;
            size_t left = dstsize;
            size_t l1;
            size_t l2 = strlen(src);
            size_t copied;
    
            while (left-- != 0 && *df != '\0')
                    df++;
            l1 = df - dst;
            if (dstsize == l1)
                    return (l1 + l2);
    
            copied = l1 + l2 >= dstsize ? dstsize - l1 - 1 : l2;
            (void) memcpy(dst + l1, src, copied);
            dst[l1+copied] = '\0';
    
            return (l1 + l2);
    }
    
    #endif

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