casadm: Add missing safeclib files

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

casadm/safeclib/strlastdiff_s.c

@@ -0,0 +1,151 @@
+/*------------------------------------------------------------------
+ * strlastdiff_s.c
+ *
+ * November 2008, Bo Berry
+ *
+ * Copyright (c) 2008-2011, 2013 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
+ *    strlastdiff_s
+ *
+ * SYNOPSIS
+ *    #include "safe_str_lib.h"
+ *    errno_t
+ *    strlastdiff_s(const char *dest, rsize_t dmax,
+ *                  const char *src, rsize_t *index)
+ *
+ * DESCRIPTION
+ *    Returns the index of the last character that is different
+ *    between dest and src.  Index is valid only for EOK.
+ *    The scanning stops at the first null in dest or src, or
+ *    after dmax characters.
+ *
+ * EXTENSION TO
+ *    ISO/IEC TR 24731, Programming languages, environments
+ *    and system software interfaces, Extensions to the C Library,
+ *    Part I: Bounds-checking interfaces
+ *
+ * INPUT PARAMETERS
+ *    dest    pointer to string to compare against
+ *
+ *    dmax    restricted maximum length of string dest
+ *
+ *    src     pointer to the string to be compared to dest
+ *
+ *    index   pointer to returned index of last difference
+ *
+ * OUTPUT PARAMETERS
+ *    index   updated index of last difference
+ *
+ * RUNTIME CONSTRAINTS
+ *    Neither dest nor src shall be a null pointer.
+ *    indicator shall not be a null pointer.
+ *    dmax shall not be 0
+ *    dmax shall not be greater than RSIZE_MAX_STR
+ *
+ * RETURN VALUE
+ *    index to last difference, when the return code is OK
+ *
+ *    EOK         index to last diff is returned
+ *    ESNODIFF    no difference
+ *    ESNULLP     NULL pointer
+ *    ESZEROL     zero length
+ *    ESLEMAX     length exceeds max limit
+ *
+ * ALSO SEE
+ *    strfirstchar_s(), strfirstdiff_s(), strfirstsame_s(),
+ *    strlastchar_s(), strlastsame_s()
+ *
+ */
+errno_t
+strlastdiff_s(const char *dest, rsize_t dmax,
+              const char *src, rsize_t *index)
+{
+    const char *rp;
+    bool there_is_a_diff = false;
+
+    if (index == NULL) {
+        invoke_safe_str_constraint_handler("strlastdiff_s: index is null",
+                   NULL, ESNULLP);
+        return (ESNULLP);
+    }
+    *index = 0;
+
+    if (dest == NULL) {
+        invoke_safe_str_constraint_handler("strlastdiff_s: dest is null",
+                   NULL, ESNULLP);
+        return (ESNULLP);
+    }
+
+    if (src == NULL) {
+        invoke_safe_str_constraint_handler("strlastdiff_s: src is null",
+                   NULL, ESNULLP);
+        return (ESNULLP);
+    }
+
+    if (dmax == 0 ) {
+        invoke_safe_str_constraint_handler("strlastdiff_s: dmax is 0",
+                   NULL, ESZEROL);
+        return (ESZEROL);
+    }
+
+    if (dmax > RSIZE_MAX_STR) {
+        invoke_safe_str_constraint_handler("strlastdiff_s: dmax exceeds max",
+                   NULL, ESLEMAX);
+        return (ESLEMAX);
+    }
+
+    /* hold reference point */
+    rp = dest;
+
+    /*
+     * find the last diff
+     */
+    while (*dest && *src && dmax) {
+
+        if (*dest != *src) {
+            there_is_a_diff = true;
+            *index = dest - rp;
+        }
+
+        dest++;
+        src++;
+        dmax--;
+    }
+
+    if (there_is_a_diff) {
+        return (EOK);
+    } else {
+        return (ESNODIFF);
+    }
+}