mksh/strlfun.c

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/* $MirOS: src/bin/mksh/strlfun.c,v 1.6 2006/11/08 23:23:41 tg Exp $ */
/* _MirOS: src/lib/libc/string/strlfun.c,v 1.10 2006/11/08 23:18:04 tg Exp $ */
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/*-
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* Copyright (c) 2006
* Thorsten Glaser <tg@mirbsd.de>
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*
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* Licensee is hereby permitted to deal in this work without restric-
* tion, including unlimited rights to use, publicly perform, modify,
* merge, distribute, sell, give away or sublicence, provided all co-
* pyright notices above, these terms and the disclaimer are retained
* in all redistributions or reproduced in accompanying documentation
* or other materials provided with binary redistributions.
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*
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* Licensor offers the work "AS IS" and WITHOUT WARRANTY of any kind,
* express, or implied, to the maximum extent permitted by applicable
* law, without malicious intent or gross negligence; in no event may
* licensor, an author or contributor be held liable for any indirect
* or other damage, or direct damage except proven a consequence of a
* direct error of said person and intended use of this work, loss or
* other issues arising in any way out of its use, even if advised of
* the possibility of such damage or existence of a defect.
*-
* The strlcat() code below has been written by Thorsten Glaser. Bodo
* Eggert suggested optimising the strlcpy() code, originally written
* by Todd C. Miller (see below), which was carried out by Th. Glaser
* as well as writing wcslcat() and wcslcpy() equivalents.
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*/
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#include <sys/types.h>
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#if defined(_KERNEL) || defined(_STANDALONE)
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#include <lib/libkern/libkern.h>
#undef HAVE_STRLCPY
#undef HAVE_STRLCAT
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#else
#if defined(HAVE_CONFIG_H) && (HAVE_CONFIG_H != 0)
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/* usually when packaged with third-party software */
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#ifdef CONFIG_H_FILENAME
#include CONFIG_H_FILENAME
#else
#include "config.h"
#endif
#endif
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extern size_t strlen(const char *);
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#endif
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#ifndef __RCSID
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#undef __IDSTRING
#undef __IDSTRING_CONCAT
#undef __IDSTRING_EXPAND
#if defined(__ELF__) && defined(__GNUC__)
#define __IDSTRING(prefix, string) \
__asm__(".section .comment" \
"\n .ascii \"@(\"\"#)" #prefix ": \"" \
"\n .asciz \"" string "\"" \
"\n .previous")
#else
#define __IDSTRING_CONCAT(l,p) __LINTED__ ## l ## _ ## p
#define __IDSTRING_EXPAND(l,p) __IDSTRING_CONCAT(l,p)
#define __IDSTRING(prefix, string) \
static const char __IDSTRING_EXPAND(__LINE__,prefix) [] \
__attribute__((used)) = "@(""#)" #prefix ": " string
#endif
#define __RCSID(x) __IDSTRING(rcsid,x)
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#endif
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#ifndef __predict_true
#define __predict_true(exp) ((exp) != 0)
#endif
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#ifndef __predict_false
#define __predict_false(exp) ((exp) != 0)
#endif
__RCSID("$MirOS: src/bin/mksh/strlfun.c,v 1.6 2006/11/08 23:23:41 tg Exp $");
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size_t strlcat(char *, const char *, size_t);
size_t strlcpy(char *, const char *, size_t);
#if !defined(HAVE_STRLCAT) || (HAVE_STRLCAT == 0)
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/*
* 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.
*/
size_t
strlcat(char *dst, const char *src, size_t dlen)
{
size_t n = 0, slen;
slen = strlen(src);
while (__predict_true(n + 1 < dlen && dst[n] != '\0'))
++n;
if (__predict_false(dlen == 0 || dst[n] != '\0'))
return (dlen + slen);
while (__predict_true((slen > 0) && (n < (dlen - 1)))) {
dst[n++] = *src++;
--slen;
}
dst[n] = '\0';
return (n + slen);
}
#endif /* !HAVE_STRLCAT */
/* $OpenBSD: strlcpy.c,v 1.10 2005/08/08 08:05:37 espie Exp $ */
/*-
* Copyright (c) 1998 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.
*/
#if !defined(HAVE_STRLCPY) || (HAVE_STRLCPY == 0)
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/*
* 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.
*/
size_t
strlcpy(char *dst, const char *src, size_t siz)
{
const char *s = src;
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if (__predict_false(siz == 0))
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goto traverse_src;
/* copy as many chars as will fit */
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while (--siz && (*dst++ = *s++))
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;
/* not enough room in dst */
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if (__predict_false(siz == 0)) {
/* safe to NUL-terminate dst since we copied <= siz-1 chars */
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*dst = '\0';
traverse_src:
/* traverse rest of src */
while (*s++)
;
}
/* count doesn't include NUL */
return (s - src - 1);
}
#endif /* !HAVE_STRLCPY */