internal.h: Add comment discouraging excessive MAXSERVERS

[adns.git] / src / internal.h

diff --git a/src/internal.h b/src/internal.h
index 00cf8258b7b6849382d923e002200cafc2c2c719..51e9ea205d46c9edd3b1513d118a84fe3bf6ebcb 100644 (file)
--- a/src/internal.h
+++ b/src/internal.h
@@ -53,7 +53,7 @@ typedef unsigned char byte;
 
 /* Configuration and constants */
 
-#define MAXSERVERS 5
+#define MAXSERVERS 5 /* do not increase beyond no. of bits in `unsigned'! */
 #define MAXSORTLIST 15
 #define UDPMAXRETRIES 15
 #define UDPRETRYMS 2000
@@ -934,7 +934,7 @@ static inline int errno_resources(int e) { return e==ENOMEM || e==ENOBUFS; }
   (( ((sz)+sizeof(union maxalign)-1) / sizeof(union maxalign) )        \
    * sizeof(union maxalign) )
 
-#define GETIL_B(cb) (((dgram)[(cb)++]) & 0x0ff)
+#define GETIL_B(cb) (((dgram)[(cb)++]) & 0x0ffu)
 #define GET_B(cb,tv) ((tv)= GETIL_B((cb)))
 #define GET_W(cb,tv) ((tv)=0,(tv)|=(GETIL_B((cb))<<8), (tv)|=GETIL_B(cb), (tv))
 #define GET_L(cb,tv) ( (tv)=0,                         \