Differential D34411 Diff 103491 contrib/mg/strlcat.c

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contrib/mg/strlcat.c

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				/* $OpenBSD: strlcat.c,v 1.15 2015/03/02 21:41:08 millert Exp $ */

				/*
				* Copyright (c) 1998, 2015 Todd C. Miller <Todd.Miller@courtesan.com>
				*
				* 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.
				*/

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

				#include "config.h"

				#ifndef HAVE_STRLCAT

				/*
				* Appends src to string dst of size dsize (unlike strncat, dsize is the
				* full size of dst, not space left). At most dsize-1 characters
				* will be copied. Always NUL terminates (unless dsize <= strlen(dst)).
				* Returns strlen(src) + MIN(dsize, strlen(initial dst)).
				* If retval >= dsize, truncation occurred.
				*/
				size_t
				strlcat(char dst, const char src, size_t dsize)
				{
				const char *odst = dst;
				const char *osrc = src;
				size_t n = dsize;
				size_t dlen;

				/* Find the end of dst and adjust bytes left but don't go past end. */
				while (n-- != 0 && *dst != '\0')
				dst++;
				dlen = dst - odst;
				n = dsize - dlen;

				if (n-- == 0)
				return(dlen + strlen(src));
				while (*src != '\0') {
				if (n != 0) {
				dst++ = src;
				n--;
				}
				src++;
				}
				*dst = '\0';

				return(dlen + (src - osrc)); /* count does not include NUL */
				}

				#endif /* !HAVE_STRLCAT */