- if (from == NULL
- && strncasecmp (ptr->ptr + i, "IRPC", from_len = 4) != 0
- && strncasecmp (ptr->ptr + i, "IRP", from_len = 3) != 0
- && strncasecmp (ptr->ptr + i, "IREPC", from_len = 5) != 0
- && strncasecmp (ptr->ptr + i, "IREP", from_len = 4) != 0
- && strncasecmp (ptr->ptr + i, "REPT", from_len = 4) != 0
- && strncasecmp (ptr->ptr + i, "REP", from_len = 3) != 0)
- from_len = 0;
+ size_t len = ptr->len - i;
+ if (from == NULL)
+ {
+ if (len >= 5 && strncasecmp (ptr->ptr + i, "IREPC", 5) == 0)
+ from_len = 5;
+ else if (len >= 4 && strncasecmp (ptr->ptr + i, "IREP", 4) == 0)
+ from_len = 4;
+ else if (len >= 4 && strncasecmp (ptr->ptr + i, "IRPC", 4) == 0)
+ from_len = 4;
+ else if (len >= 4 && strncasecmp (ptr->ptr + i, "REPT", 4) == 0)
+ from_len = 4;
+ else if (len >= 3 && strncasecmp (ptr->ptr + i, "IRP", 3) == 0)
+ from_len = 3;
+ else if (len >= 3 && strncasecmp (ptr->ptr + i, "REP", 3) == 0)
+ from_len = 3;
+ else
+ from_len = 0;
+ }