tools/paxmirabilis/strlfun.c

/* $MirOS: src/lib/libc/string/strlfun.c,v 1.14 2007/01/07 02:11:40 tg Exp $ */

/*-
 * Copyright (c) 2006
 *      Thorsten Glaser <tg@mirbsd.de>
 *
 * Provided that these terms and disclaimer and all copyright notices
 * are retained or reproduced in an accompanying document, permission
 * is granted to deal in this work without restriction, including un-
 * limited rights to use, publicly perform, distribute, sell, modify,
 * merge, give away, or sublicence.
 *
 * This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
 * the utmost extent permitted by applicable law, neither express nor
 * implied; without malicious intent or gross negligence. In no event
 * may a licensor, author or contributor be held liable for indirect,
 * direct, other damage, loss, or other issues arising in any way out
 * of dealing in the work, even if advised of the possibility of such
 * damage or existence of a defect, except proven that it results out
 * of said person's immediate fault when using the work as intended.
 *-
 * 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 merging this code with strxfrm() for ISO-10646-only sy-
 * stems and writing wcslcat(), wcslcpy() and wcsxfrm() equivalents.
 */

#ifdef STRXFRM
#undef HAVE_STRLCPY
#undef HAVE_STRLCAT
#define HAVE_STRLCPY    0
#define HAVE_STRLCAT    1
#define strlcpy         strxfrm
#endif

#include <sys/types.h>
#if defined(_KERNEL) || defined(_STANDALONE)
#include <lib/libkern/libkern.h>
#undef HAVE_STRLCPY
#undef HAVE_STRLCAT
#else
#if defined(HAVE_CONFIG_H) && (HAVE_CONFIG_H != 0)
/* usually when packaged with third-party software */
#ifdef CONFIG_H_FILENAME
#include CONFIG_H_FILENAME
#else
#include "config.h"
#endif
#endif
extern size_t strlen(const char *);
#endif

#ifndef __RCSID
#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)
#endif

#ifndef __predict_true
#define __predict_true(exp)     ((exp) != 0)
#endif
#ifndef __predict_false
#define __predict_false(exp)    ((exp) != 0)
#endif

#if !defined(_KERNEL) && !defined(_STANDALONE)
__RCSID("$MirOS: src/lib/libc/string/strlfun.c,v 1.14 2007/01/07 02:11:40 tg Exp $");
#endif

#ifndef _STRLCPY_DEFNS
size_t strlcat(char *, const char *, size_t);
size_t strlcpy(char *, const char *, size_t);
#endif

#if !defined(HAVE_STRLCAT) || (HAVE_STRLCAT == 0)
/*
 * 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)
/*
 * 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;

        if (__predict_false(siz == 0))
                goto traverse_src;

        /* copy as many chars as will fit */
        while (--siz && (*dst++ = *s++))
                ;

        /* not enough room in dst */
        if (__predict_false(siz == 0)) {
                /* safe to NUL-terminate dst since we copied <= siz-1 chars */
                *dst = '\0';
 traverse_src:
                /* traverse rest of src */
                while (*s++)
                        ;
        }

        /* count doesn't include NUL */
        return (s - src - 1);
}
#endif /* !HAVE_STRLCPY */
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1	/* $MirOS: src/lib/libc/string/strlfun.c,v 1.14 2007/01/07 02:11:40 tg Exp $ */
2
3	/*-
4	* Copyright (c) 2006
5	* Thorsten Glaser <tg@mirbsd.de>
6	*
7	* Provided that these terms and disclaimer and all copyright notices
8	* are retained or reproduced in an accompanying document, permission
9	* is granted to deal in this work without restriction, including un-
10	* limited rights to use, publicly perform, distribute, sell, modify,
11	* merge, give away, or sublicence.
12	*
13	* This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
14	* the utmost extent permitted by applicable law, neither express nor
15	* implied; without malicious intent or gross negligence. In no event
16	* may a licensor, author or contributor be held liable for indirect,
17	* direct, other damage, loss, or other issues arising in any way out
18	* of dealing in the work, even if advised of the possibility of such
19	* damage or existence of a defect, except proven that it results out
20	* of said person's immediate fault when using the work as intended.
21	*-
22	* The strlcat() code below has been written by Thorsten Glaser. Bodo
23	* Eggert suggested optimising the strlcpy() code, originally written
24	* by Todd C. Miller (see below), which was carried out by Th. Glaser
25	* as well as merging this code with strxfrm() for ISO-10646-only sy-
26	* stems and writing wcslcat(), wcslcpy() and wcsxfrm() equivalents.
27	*/
28
29	#ifdef STRXFRM
30	#undef HAVE_STRLCPY
31	#undef HAVE_STRLCAT
32	#define HAVE_STRLCPY 0
33	#define HAVE_STRLCAT 1
34	#define strlcpy strxfrm
35	#endif
36
37	#include <sys/types.h>
38	#if defined(_KERNEL) \|\| defined(_STANDALONE)
39	#include <lib/libkern/libkern.h>
40	#undef HAVE_STRLCPY
41	#undef HAVE_STRLCAT
42	#else
43	#if defined(HAVE_CONFIG_H) && (HAVE_CONFIG_H != 0)
44	/* usually when packaged with third-party software */
45	#ifdef CONFIG_H_FILENAME
46	#include CONFIG_H_FILENAME
47	#else
48	#include "config.h"
49	#endif
50	#endif
51	extern size_t strlen(const char *);
52	#endif
53
54	#ifndef __RCSID
55	#undef __IDSTRING
56	#undef __IDSTRING_CONCAT
57	#undef __IDSTRING_EXPAND
58	#if defined(__ELF__) && defined(__GNUC__)
59	#define __IDSTRING(prefix, string) \
60	__asm__(".section .comment" \
61	"\n .ascii \"@(\"\"#)" #prefix ": \"" \
62	"\n .asciz \"" string "\"" \
63	"\n .previous")
64	#else
65	#define __IDSTRING_CONCAT(l,p) __LINTED__ ## l ## _ ## p
66	#define __IDSTRING_EXPAND(l,p) __IDSTRING_CONCAT(l,p)
67	#define __IDSTRING(prefix, string) \
68	static const char __IDSTRING_EXPAND(__LINE__,prefix) [] \
69	__attribute__((used)) = "@(""#)" #prefix ": " string
70	#endif
71	#define __RCSID(x) __IDSTRING(rcsid,x)
72	#endif
73
74	#ifndef __predict_true
75	#define __predict_true(exp) ((exp) != 0)
76	#endif
77	#ifndef __predict_false
78	#define __predict_false(exp) ((exp) != 0)
79	#endif
80
81	#if !defined(_KERNEL) && !defined(_STANDALONE)
82	__RCSID("$MirOS: src/lib/libc/string/strlfun.c,v 1.14 2007/01/07 02:11:40 tg Exp $");
83	#endif
84
85	#ifndef _STRLCPY_DEFNS
86	size_t strlcat(char , const char , size_t);
87	size_t strlcpy(char , const char , size_t);
88	#endif
89
90	#if !defined(HAVE_STRLCAT) \|\| (HAVE_STRLCAT == 0)
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 dlen)
100	{
101	size_t n = 0, slen;
102
103	slen = strlen(src);
104	while (__predict_true(n + 1 < dlen && dst[n] != '\0'))
105	++n;
106	if (__predict_false(dlen == 0 \|\| dst[n] != '\0'))
107	return (dlen + slen);
108	while (__predict_true((slen > 0) && (n < (dlen - 1)))) {
109	dst[n++] = *src++;
110	--slen;
111	}
112	dst[n] = '\0';
113	return (n + slen);
114	}
115	#endif /* !HAVE_STRLCAT */
116
117	/* $OpenBSD: strlcpy.c,v 1.10 2005/08/08 08:05:37 espie Exp $ */
118
119	/*-
120	* Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
121	*
122	* Permission to use, copy, modify, and distribute this software for any
123	* purpose with or without fee is hereby granted, provided that the above
124	* copyright notice and this permission notice appear in all copies.
125	*/
126
127	#if !defined(HAVE_STRLCPY) \|\| (HAVE_STRLCPY == 0)
128	/*
129	* Copy src to string dst of size siz. At most siz-1 characters
130	* will be copied. Always NUL terminates (unless siz == 0).
131	* Returns strlen(src); if retval >= siz, truncation occurred.
132	*/
133	size_t
134	strlcpy(char dst, const char src, size_t siz)
135	{
136	const char *s = src;
137
138	if (__predict_false(siz == 0))
139	goto traverse_src;
140
141	/* copy as many chars as will fit */
142	while (--siz && (dst++ = s++))
143	;
144
145	/* not enough room in dst */
146	if (__predict_false(siz == 0)) {
147	/* safe to NUL-terminate dst since we copied <= siz-1 chars */
148	*dst = '\0';
149	traverse_src:
150	/* traverse rest of src */
151	while (*s++)
152	;
153	}
154
155	/* count doesn't include NUL */
156	return (s - src - 1);
157	}
158	#endif /* !HAVE_STRLCPY */