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Make strlcpy()/strlcat() slightly easier to read

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Backport new changes from OpenBSD.

[guillem@hadrons.org:
 - Update copyright years in COPYING. ]

References: https://svnweb.freebsd.org/base?view=revision&revision=281135
Signed-off-by: Igor Gnatenko <i.gnatenko.brain@gmail.com>
Signed-off-by: Guillem Jover <guillem@hadrons.org>
This commit is contained in:
Igor Gnatenko 2016-06-27 09:21:43 +02:00 committed by Guillem Jover
parent ab5db68bae
commit 7aede6a999
3 changed files with 43 additions and 44 deletions
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2
COPYING
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@ -414,7 +414,7 @@ Copyright:
All rights reserved.
.
Copyright © 1996 David Mazieres <dm@uun.org>
Copyright © 1998, 2000-2002, 2004-2005, 2007, 2010, 2012-2014
Copyright © 1998, 2000-2002, 2004-2005, 2007, 2010, 2012-2015
Todd C. Miller <Todd.Miller@courtesan.com>
Copyright © 2004 Ted Unangst
Copyright © 2008 Damien Miller <djm@openbsd.org>

48
src/strlcat.c
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@ -1,7 +1,7 @@
/* $OpenBSD: strlcat.c,v 1.12 2005/03/30 20:13:52 otto Exp $ */
/* $OpenBSD: strlcat.c,v 1.15 2015/03/02 21:41:08 millert Exp $ */
/*
* Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
* 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
@ -20,36 +20,36 @@
#include <string.h>
/*
* Appends src to string dst of size siz (unlike strncat, siz is the
* full size of dst, not space left). At most siz-1 characters
* will be copied. Always NUL terminates (unless siz <= strlen(dst)).
* Returns strlen(src) + MIN(siz, strlen(initial dst)).
* If retval >= siz, truncation occurred.
* 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 siz)
strlcat(char *dst, const char *src, size_t dsize)
{
char *d = dst;
const char *s = src;
size_t n = siz;
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 && *d != '\0')
d++;
dlen = d - dst;
n = siz - 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(s));
while (*s != '\0') {
if (n != 1) {
*d++ = *s;
if (n-- == 0)
return(dlen + strlen(src));
while (*src != '\0') {
if (n != 0) {
*dst++ = *src;
n--;
}
s++;
src++;
}
*d = '\0';
*dst = '\0';
return(dlen + (s - src)); /* count does not include NUL */
return(dlen + (src - osrc)); /* count does not include NUL */
}

37
src/strlcpy.c
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@ -1,7 +1,7 @@
/* $OpenBSD: strlcpy.c,v 1.10 2005/08/08 08:05:37 espie Exp $ */
/* $OpenBSD: strlcpy.c,v 1.12 2015/01/15 03:54:12 millert Exp $ */
/*
* Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
* 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
@ -20,32 +20,31 @@
#include <string.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.
* Copy string src to buffer dst of size dsize. At most dsize-1
* chars will be copied. Always NUL terminates (unless dsize == 0).
* Returns strlen(src); if retval >= dsize, truncation occurred.
*/
size_t
strlcpy(char *dst, const char *src, size_t siz)
strlcpy(char *dst, const char *src, size_t dsize)
{
char *d = dst;
const char *s = src;
size_t n = siz;
const char *osrc = src;
size_t nleft = dsize;
/* Copy as many bytes as will fit */
if (n != 0) {
while (--n != 0) {
if ((*d++ = *s++) == '\0')
/* Copy as many bytes as will fit. */
if (nleft != 0) {
while (--nleft != 0) {
if ((*dst++ = *src++) == '\0')
break;
}
}
/* 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++)
/* Not enough room in dst, add NUL and traverse rest of src. */
if (nleft == 0) {
if (dsize != 0)
*dst = '\0'; /* NUL-terminate dst */
while (*src++)
;
}
return(s - src - 1); /* count does not include NUL */
return(src - osrc - 1); /* count does not include NUL */
}