esp-idf: Fix compiler warning

obgm · Jul 25, 2023 · 46f3d82 · 46f3d82
1 parent 084c866
commit 46f3d82
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/coap_oscore.c b/src/coap_oscore.c
@@ -1646,8 +1646,8 @@ parse_hex_bin(const char *begin, const char *end) {
  binary = coap_new_binary((end - begin) / 2);
  if (binary == NULL)
  goto bad_entry;
- for (i = 0; (i < (size_t)(end - begin)) && isxdigit(begin[i]) &&
- isxdigit(begin[i + 1]);
+ for (i = 0; (i < (size_t)(end - begin)) && isxdigit((u_char)begin[i]) &&
+ isxdigit((u_char)begin[i + 1]);
  i += 2) {
  binary->s[i / 2] = (hex2char(begin[i]) << 4) + hex2char(begin[i + 1]);
  }