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      1 /*	$NetBSD: strl_obsd.c,v 1.5 2020/05/25 20:47:24 christos Exp $	*/
      2 
      3 /*
      4  * Why use strlcpy()/strlcat() instead of standard strncpy()/strncat()?
      5  * To reduce likelihood of bugs and avoid wasteful zero fills.  See:
      6  * http://www.gratisoft.us/todd/papers/strlcpy.html
      7  */
      8 
      9 /*	$OpenBSD: strlcpy.c,v 1.11 2006/05/05 15:27:38 millert Exp $	*/
     10 
     11 /*
     12  * Copyright (c) 1998 Todd C. Miller <Todd.Miller (at) courtesan.com>
     13  *
     14  * Permission to use, copy, modify, and distribute this software for any
     15  * purpose with or without fee is hereby granted, provided that the above
     16  * copyright notice and this permission notice appear in all copies.
     17  *
     18  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     19  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     20  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     21  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     22  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     23  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     24  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     25  */
     26 
     27 #include <config.h>		/* + marks local changes */
     28 #ifdef HAVE_SYS_TYPES_H		/* + */
     29 #include <sys/types.h>
     30 #endif				/* + */
     31 #include <string.h>
     32 
     33 #include "ntp_stdlib.h"		/* + strlcpy, strlcat prototypes */
     34 
     35 #ifndef HAVE_STRLCPY		/* + */
     36 /*
     37  * Copy src to string dst of size siz.  At most siz-1 characters
     38  * will be copied.  Always NUL terminates (unless siz == 0).
     39  * Returns strlen(src); if retval >= siz, truncation occurred.
     40  */
     41 size_t
     42 strlcpy(char *dst, const char *src, size_t siz)
     43 {
     44 	char *d = dst;
     45 	const char *s = src;
     46 	size_t n = siz;
     47 
     48 	/* Copy as many bytes as will fit */
     49 	if (n != 0) {
     50 		while (--n != 0) {
     51 			if ((*d++ = *s++) == '\0')
     52 				break;
     53 		}
     54 	}
     55 
     56 	/* Not enough room in dst, add NUL and traverse rest of src */
     57 	if (n == 0) {
     58 		if (siz != 0)
     59 			*d = '\0';		/* NUL-terminate dst */
     60 		while (*s++)
     61 			;
     62 	}
     63 
     64 	return(s - src - 1);	/* count does not include NUL */
     65 }
     66 #endif				/* + */
     67 
     68 
     69 /*	$OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $	*/
     70 
     71 /*
     72  * Copyright (c) 1998 Todd C. Miller <Todd.Miller (at) courtesan.com>
     73  *
     74  * Permission to use, copy, modify, and distribute this software for any
     75  * purpose with or without fee is hereby granted, provided that the above
     76  * copyright notice and this permission notice appear in all copies.
     77  *
     78  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     79  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     80  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     81  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     82  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     83  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     84  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     85  */
     86 
     87 /* #include <sys/types.h> */	/* + */
     88 /* #include <string.h> */	/* + */
     89 
     90 #ifndef HAVE_STRLCAT		/* + */
     91 /*
     92  * Appends src to string dst of size siz (unlike strncat, siz is the
     93  * full size of dst, not space left).  At most siz-1 characters
     94  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
     95  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
     96  * If retval >= siz, truncation occurred.
     97  */
     98 size_t
     99 strlcat(char *dst, const char *src, size_t siz)
    100 {
    101 	char *d = dst;
    102 	const char *s = src;
    103 	size_t n = siz;
    104 	size_t dlen;
    105 
    106 	/* Find the end of dst and adjust bytes left but don't go past end */
    107 	while (n-- != 0 && *d != '\0')
    108 		d++;
    109 	dlen = d - dst;
    110 	n = siz - dlen;
    111 
    112 	if (n == 0)
    113 		return(dlen + strlen(s));
    114 	while (*s != '\0') {
    115 		if (n != 1) {
    116 			*d++ = *s;
    117 			n--;
    118 		}
    119 		s++;
    120 	}
    121 	*d = '\0';
    122 
    123 	return(dlen + (s - src));	/* count does not include NUL */
    124 }
    125 #endif				/* + */
    126