Fix nasa#444, Adds JSC 2.1 Static Analysis comments and adds OS_strnlen

This commit addresses issues flagged during static analysis by:
- Adding JSC 2.1 disposition comments.
- Replacing strlen with OS_strnlen.

fsw/src/cf_cfdp.c

@@ -299,22 +299,6 @@ CF_Logical_PduBuffer_t *CF_CFDP_ConstructPduHeader(const CF_Transaction_t *txn,
     return ph;
 }
 
-/*----------------------------------------------------------------
- *
- * Internal helper routine only, not part of API.
- *
- *-----------------------------------------------------------------*/
-static inline size_t CF_strnlen(const char *str, size_t maxlen)
-{
-    const char *end = memchr(str, 0, maxlen);
-    if (end != NULL)
-    {
-        /* actual length of string is difference */
-        maxlen = end - str;
-    }
-    return maxlen;
-}
-
 /*----------------------------------------------------------------
  *
  * Application-scope internal function
@@ -344,10 +328,10 @@ CFE_Status_t CF_CFDP_SendMd(CF_Transaction_t *txn)
         /* at this point, need to append filenames into md packet */
         /* this does not actually copy here - that is done during encode */
         md->source_filename.length =
-            CF_strnlen(txn->history->fnames.src_filename, sizeof(txn->history->fnames.src_filename));
+            OS_strnlen(txn->history->fnames.src_filename, sizeof(txn->history->fnames.src_filename));
         md->source_filename.data_ptr = txn->history->fnames.src_filename;
         md->dest_filename.length =
-            CF_strnlen(txn->history->fnames.dst_filename, sizeof(txn->history->fnames.dst_filename));
+            OS_strnlen(txn->history->fnames.dst_filename, sizeof(txn->history->fnames.dst_filename));
         md->dest_filename.data_ptr = txn->history->fnames.dst_filename;
 
         CF_CFDP_EncodeMd(ph->penc, md);

fsw/src/cf_utils.c

@@ -184,20 +184,23 @@ CFE_Status_t CF_WriteHistoryEntryToFile(osal_id_t fd, const CF_History_t *histor
         {
             case 0:
                 CF_Assert(history->dir < CF_Direction_NUM);
+                /* SAD: No need to check snprintf return; buffer size is sufficient for the formatted output */
                 snprintf(linebuf, sizeof(linebuf), "SEQ (%lu, %lu)\tDIR: %s\tPEER %lu\tSTAT: %d\t",
                          (unsigned long)history->src_eid, (unsigned long)history->seq_num, CF_DSTR[history->dir],
                          (unsigned long)history->peer_eid, (int)history->txn_stat);
                 break;
             case 1:
+                /* SAD: No need to check snprintf return; buffer size is sufficient for the formatted output */
                 snprintf(linebuf, sizeof(linebuf), "SRC: %s\t", history->fnames.src_filename);
                 break;
             case 2:
             default:
+                /* SAD: No need to check snprintf return; buffer size is sufficient for the formatted output */
                 snprintf(linebuf, sizeof(linebuf), "DST: %s\n", history->fnames.dst_filename);
                 break;
         }
 
-        len = strlen(linebuf);
+        len = OS_strnlen(linebuf, (CF_FILENAME_MAX_LEN * 2) + 128);
         ret = CF_WrappedWrite(fd, linebuf, len);
         if (ret != len)
         {

unit-test/stubs/cf_utils_stubs.c

@@ -41,7 +41,7 @@ void UT_DefaultHandler_CF_WriteTxnQueueDataToFile(void *, UT_EntryKey_t, const U
  * Generated stub function for CF_FindTransactionBySequenceNumber()
  * ----------------------------------------------------
  */
-CF_Transaction_t *CF_FindTransactionBySequenceNumber(CF_Channel_t       *chan,
+CF_Transaction_t *CF_FindTransactionBySequenceNumber(CF_Channel_t *      chan,
                                                      CF_TransactionSeq_t transaction_sequence_number,
                                                      CF_EntityId_t       src_eid)
 {