Initial commit

Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>

casadm/safeclib/strnlen_s.c

@@ -0,0 +1,117 @@
+/*------------------------------------------------------------------
+ * strnlen_s.c
+ *
+ * October 2008, Bo Berry
+ *
+ * Copyright (c) 2008-2011 by Cisco Systems, Inc
+ * All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *------------------------------------------------------------------
+ */
+
+#include "safeclib_private.h"
+#include "safe_str_constraint.h"
+#include "safe_str_lib.h"
+
+
+/**
+ * NAME
+ *    strnlen_s
+ *
+ * SYNOPSIS
+ *    #include "safe_str_lib.h"
+ *    rsize_t
+ *    strnlen_s(const char *dest, rsize_t dmax)
+ *
+ * DESCRIPTION
+ *    The strnlen_s function computes the length of the string pointed
+ *    to by dest.
+ *
+ * SPECIFIED IN
+ *    ISO/IEC TR 24731-1, Programming languages, environments
+ *    and system software interfaces, Extensions to the C Library,
+ *    Part I: Bounds-checking interfaces
+ *
+ * INPUT PARAMETERS
+ *    dest      pointer to string
+ *
+ *    dmax      restricted maximum length (including null character).
+ *
+ * OUTPUT PARAMETERS
+ *    none
+ *
+ * RUNTIME CONSTRAINTS
+ *    dest shall not be a null pointer
+ *    dmax shall not be greater than RSIZE_MAX_STR
+ *    dmax shall not equal zero
+ *    null character shall be in first dmax characters of dest
+ *
+ * RETURN VALUE
+ *    The function returns the string length, excluding  the terminating
+ *    null character.  If dest is NULL, then strnlen_s returns 0.
+ *
+ *    Otherwise, the strnlen_s function returns the number of characters
+ *    that precede the terminating null character.
+ *    At most the first dmax characters of dest are accessed by strnlen_s.
+ *
+ * ALSO SEE
+ *    strnterminate_s()
+ *
+ */
+rsize_t
+strnlen_s (const char *dest, rsize_t dmax)
+{
+    rsize_t count;
+    rsize_t orig_dmax = dmax;
+
+    if (dest == NULL) {
+        return RCNEGATE(0);
+    }
+
+    if (dmax == 0) {
+        invoke_safe_str_constraint_handler("strnlen_s: dmax is 0",
+                   NULL, ESZEROL);
+        return RCNEGATE(0);
+    }
+
+    if (dmax > RSIZE_MAX_STR) {
+        invoke_safe_str_constraint_handler("strnlen_s: dmax exceeds max",
+                   NULL, ESLEMAX);
+        return RCNEGATE(0);
+    }
+
+    count = 0;
+    while (*dest && dmax) {
+        count++;
+        dmax--;
+        dest++;
+    }
+    if (count == orig_dmax) {
+        invoke_safe_str_constraint_handler("strnlen_s: string length exceeds dmax",
+					   NULL, ESLEMAX);
+        return RCNEGATE(0);
+    }
+
+    return RCNEGATE(count);
+}
+EXPORT_SYMBOL(strnlen_s);