dvander@27: /* Safe string copying and concatenation
dvander@27:  * These routines are originally distributed in two separate files. I have
dvander@27:  * copied the files verbatim in this single source file, including all comments.
dvander@27:  * The only change is that the second set of include files is commented out
dvander@27:  * (there is no need to include the same files twice).
dvander@27:  */
dvander@27: 
dvander@27: #include "lstring.h"
dvander@27: 
dvander@27: #if !defined HAVE_SAFESTR
dvander@27: 
dvander@27: /*	$OpenBSD: strlcpy.c,v 1.10 2005/08/08 08:05:37 espie Exp $	*/
dvander@27: 
dvander@27: /*
dvander@27:  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
dvander@27:  *
dvander@27:  * Permission to use, copy, modify, and distribute this software for any
dvander@27:  * purpose with or without fee is hereby granted, provided that the above
dvander@27:  * copyright notice and this permission notice appear in all copies.
dvander@27:  *
dvander@27:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
dvander@27:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
dvander@27:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
dvander@27:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
dvander@27:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
dvander@27:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
dvander@27:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
dvander@27:  */
dvander@27: 
dvander@27: /*
dvander@27:   #include <sys/types.h>  already included through lstring.h
dvander@27:  */
dvander@27: #include <string.h>   /* for strlen() */
dvander@27: 
dvander@27: /*
dvander@27:  * Copy src to string dst of size siz.  At most siz-1 characters
dvander@27:  * will be copied.  Always NUL terminates (unless siz == 0).
dvander@27:  * Returns strlen(src); if retval >= siz, truncation occurred.
dvander@27:  */
dvander@27: size_t
dvander@27: strlcpy(char *dst, const char *src, size_t siz)
dvander@27: {
dvander@27: 	char *d = dst;
dvander@27: 	const char *s = src;
dvander@27: 	size_t n = siz;
dvander@27: 
dvander@27: 	/* Copy as many bytes as will fit */
dvander@27: 	if (n != 0 && --n != 0) {
dvander@27: 		do {
dvander@27: 			if ((*d++ = *s++) == 0)
dvander@27: 				break;
dvander@27: 		} while (--n != 0);
dvander@27: 	}
dvander@27: 
dvander@27: 	/* Not enough room in dst, add NUL and traverse rest of src */
dvander@27: 	if (n == 0) {
dvander@27: 		if (siz != 0)
dvander@27: 			*d = '\0';		/* NUL-terminate dst */
dvander@27: 		while (*s++)
dvander@27: 			;
dvander@27: 	}
dvander@27: 
dvander@27: 	return(s - src - 1);	/* count does not include NUL */
dvander@27: }
dvander@27: 
dvander@27: /*	$OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $	*/
dvander@27: 
dvander@27: /*
dvander@27:  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
dvander@27:  *
dvander@27:  * Permission to use, copy, modify, and distribute this software for any
dvander@27:  * purpose with or without fee is hereby granted, provided that the above
dvander@27:  * copyright notice and this permission notice appear in all copies.
dvander@27:  *
dvander@27:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
dvander@27:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
dvander@27:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
dvander@27:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
dvander@27:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
dvander@27:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
dvander@27:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
dvander@27:  */
dvander@27: 
dvander@27: /*
dvander@27:   #include <sys/types.h>    already included
dvander@27:   #include <string.h>       already included
dvander@27: */
dvander@27: 
dvander@27: /*
dvander@27:  * Appends src to string dst of size siz (unlike strncat, siz is the
dvander@27:  * full size of dst, not space left).  At most siz-1 characters
dvander@27:  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
dvander@27:  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
dvander@27:  * If retval >= siz, truncation occurred.
dvander@27:  */
dvander@27: size_t
dvander@27: strlcat(char *dst, const char *src, size_t siz)
dvander@27: {
dvander@27: 	char *d = dst;
dvander@27: 	const char *s = src;
dvander@27: 	size_t n = siz;
dvander@27: 	size_t dlen;
dvander@27: 
dvander@27: 	/* Find the end of dst and adjust bytes left but don't go past end */
dvander@27: 	while (n-- != 0 && *d != '\0')
dvander@27: 		d++;
dvander@27: 	dlen = d - dst;
dvander@27: 	n = siz - dlen;
dvander@27: 
dvander@27: 	if (n == 0)
dvander@27: 		return(dlen + strlen(s));
dvander@27: 	while (*s != '\0') {
dvander@27: 		if (n != 1) {
dvander@27: 			*d++ = *s;
dvander@27: 			n--;
dvander@27: 		}
dvander@27: 		s++;
dvander@27: 	}
dvander@27: 	*d = '\0';
dvander@27: 
dvander@27: 	return(dlen + (s - src));	/* count does not include NUL */
dvander@27: }
dvander@27: 
dvander@27: #endif /* #if !defined HAVE_SAFESTR */