strlcpy.c

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/*
 *   Permission to use, copy, modify, and distribute this software for any
 *   purpose with or without fee is hereby granted, provided that the above
 *   copyright notice and this permission notice appear in all copies.
 *
 *   THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 *   WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 *   MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 *   ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 *   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 *   ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 *   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 
/** Local implementation of the strlcpy function
 *
 * @file src/lib/util/strlcpy.c
 *
 * @copyright (c) 1998 Todd C. Miller (Todd.Miller@courtesan.com)
 */
RCSID("$Id: 3d0e937dc1088377d3c5120d5c95f6adc74262b3 $")
 
#ifndef HAVE_STRLCPY
 
#include <freeradius-devel/missing.h>
 
/*
 * Copy src to string dst of size siz.  At most siz-1 characters
 * will be copied.  Always NUL terminates (unless siz == 0).
 * Returns strlen(src); if retval >= siz, truncation occurred.
 */
/** @hidecallergraph */
size_t
strlcpy(char *dst, char const *src, size_t siz)
{
        char *d = dst;
        char const *s = src;
        size_t n = siz;
 
        /* Copy as many bytes as will fit */
        if (n != 0 && --n != 0) {
                do {
                        if ((*d++ = *s++) == 0)
                                break;
                } while (--n != 0);
        }
 
        /* Not enough room in dst, add NUL and traverse rest of src */
        if (n == 0) {
                if (siz != 0)
                        *d = '\0';              /* NUL-terminate dst */
                while (*s++)
                        ;
        }
 
        return(s - src - 1);    /* count does not include NUL */
}
 
#endif