Oscbs 33 ci zephyr port (#375)

* zephyr: twister build fixes/patches

* zephyr: hack: suppress bvlc test (build failures)

Co-authored-by: Gregory Shue <gregory.shue@legrand.com>

src/bacnet/bacstr.c

@@ -1012,7 +1012,7 @@ bool octetstring_init_ascii_hex(
             status = true;
         } else {
             while (ascii_hex[index] != 0) {
-                if (!isalnum(ascii_hex[index])) {
+                if (!isalnum((int)ascii_hex[index])) {
                     /* skip non-numeric or alpha */
                     index++;
                     continue;

src/bacnet/basic/sys/platform.h

@@ -35,6 +35,8 @@
 
 # if defined(WIN32) || defined(WIN64)
 #  define strcasecmp _stricmp
+#elif defined(__ZEPHYR__)
+#  include <strings.h>
 # endif
 
 #if defined(__GNUC__)

src/bacnet/datalink/cobs.c

@@ -96,9 +96,10 @@ size_t cobs_encode(uint8_t *buffer,
     size_t read_index = 0;
     size_t write_index = 1;
     uint8_t code = 1;
-    uint8_t data, last_code;
+    uint8_t data = 0;
+    uint8_t last_code = 0;
 
-    if (buffer_size < 1) {
+    if ((buffer_size < 1) || (length < 1)) {
         /* error - buffer too small */
         return 0;
     }