1 /*------------------------------------------------------------------
4 * October 2008, Bo Berry
6 * Copyright (c) 2008-2011 by Cisco Systems, Inc
9 * Permission is hereby granted, free of charge, to any person
10 * obtaining a copy of this software and associated documentation
11 * files (the "Software"), to deal in the Software without
12 * restriction, including without limitation the rights to use,
13 * copy, modify, merge, publish, distribute, sublicense, and/or
14 * sell copies of the Software, and to permit persons to whom the
15 * Software is furnished to do so, subject to the following
18 * The above copyright notice and this permission notice shall be
19 * included in all copies or substantial portions of the Software.
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
23 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
25 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
26 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
27 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
28 * OTHER DEALINGS IN THE SOFTWARE.
29 *------------------------------------------------------------------
32 #include "safeclib_private.h"
33 #include "safe_str_constraint.h"
34 #include "safe_str_lib.h"
42 * #include "safe_str_lib.h"
44 * strnlen_s(const char *dest, rsize_t dmax)
47 * The strnlen_s function computes the length of the string pointed
51 * ISO/IEC TR 24731-1, Programming languages, environments
52 * and system software interfaces, Extensions to the C Library,
53 * Part I: Bounds-checking interfaces
56 * dest pointer to string
58 * dmax restricted maximum length.
64 * dest shall not be a null pointer
65 * dmax shall not be greater than RSIZE_MAX_STR
66 * dmax shall not equal zero
69 * The function returns the string length, excluding the terminating
70 * null character. If dest is NULL, then strnlen_s returns 0.
72 * Otherwise, the strnlen_s function returns the number of characters
73 * that precede the terminating null character. If there is no null
74 * character in the first dmax characters of dest then strnlen_s returns
75 * dmax. At most the first dmax characters of dest are accessed
83 strnlen_s (const char *dest
, rsize_t dmax
)
92 invoke_safe_str_constraint_handler("strnlen_s: dmax is 0",
97 if (dmax
> RSIZE_MAX_STR
) {
98 invoke_safe_str_constraint_handler("strnlen_s: dmax exceeds max",
104 while (*dest
&& dmax
) {
110 return RCNEGATE(count
);
112 EXPORT_SYMBOL(strnlen_s
);