118 lines
3.3 KiB
C
118 lines
3.3 KiB
C
/* $MirOS: src/bin/mksh/strlfun.c,v 1.3 2006/08/01 13:43:28 tg Exp $ */
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/* _MirOS: src/lib/libc/string/strlfun.c,v 1.7 2006/08/01 13:41:49 tg Exp $ */
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/* $OpenBSD: strlcpy.c,v 1.10 2005/08/08 08:05:37 espie Exp $ */
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/* $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $ */
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/*-
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* Copyright (c) 2004, 2005, 2006 Thorsten Glaser <tg@mirbsd.de>
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* Thanks to Bodo Eggert for optimisation hints
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* Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#if defined(_KERNEL) || defined(_STANDALONE)
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# include <lib/libkern/libkern.h>
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# undef HAVE_STRLCPY
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# undef HAVE_STRLCAT
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#else
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# ifdef HAVE_CONFIG_H /* usually when packaged with third-party software */
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# include "config.h"
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# endif
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# include <sys/types.h>
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extern size_t strlen(const char *);
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#ifndef __RCSID
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#define __RCSID(x) static const char __rcsid[] = (x)
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#endif
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#ifndef __predict_false
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#define __predict_false(exp) ((exp) != 0)
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#endif
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__RCSID("$MirOS: src/bin/mksh/strlfun.c,v 1.3 2006/08/01 13:43:28 tg Exp $");
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#endif
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size_t strlcat(char *, const char *, size_t);
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size_t strlcpy(char *, const char *, size_t);
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#ifndef HAVE_STRLCPY
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/*
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* Copy src to string dst of size siz. At most siz-1 characters
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* will be copied. Always NUL terminates (unless siz == 0).
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* Returns strlen(src); if retval >= siz, truncation occurred.
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*/
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size_t
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strlcpy(char *dst, const char *src, size_t siz)
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{
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const char *s = src;
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if (__predict_false(!siz))
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goto traverse_src;
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/* copy as many chars as will fit */
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for (; --siz && (*dst++ = *s++); )
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;
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/* not enough room in dst */
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if (__predict_false(!siz)) {
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/* safe to NUL-terminate dst since copied <= siz-1 chars */
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*dst = '\0';
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traverse_src:
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/* traverse rest of src */
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while (*s++)
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;
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}
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/* count doesn't include NUL */
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return (s - src - 1);
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}
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#endif /* !HAVE_STRLCPY */
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#ifndef HAVE_STRLCAT
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/*
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* Appends src to string dst of size siz (unlike strncat, siz is the
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* full size of dst, not space left). At most siz-1 characters
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* will be copied. Always NUL terminates (unless siz <= strlen(dst)).
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* Returns strlen(src) + MIN(siz, strlen(initial dst)).
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* If retval >= siz, truncation occurred.
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*/
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size_t
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strlcat(char *dst, const char *src, size_t siz)
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{
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char *d = dst;
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size_t dl, n = siz;
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const size_t sl = strlen(src);
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while (n-- && (*d++ != '\0'))
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;
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if (!++n && (*d != '\0'))
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return (strlen(src));
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dl = --d - dst; /* original strlen(dst), max. siz-1 */
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n = siz - dl;
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dl += sl;
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if (__predict_false(!n--))
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return (dl);
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if (__predict_false(n > sl))
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n = sl; /* number of chars to copy */
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for (; n-- && (*d++ = *src++); )
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;
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*d = '\0'; /* NUL-terminate dst */
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return (dl);
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}
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#endif /* !HAVE_STRLCAT */
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