- Add const-qualifiers to the arguments of isonum_*().

- According to ISO 9660 7.1.2, isonum_712() should return a signed value.
- Try to get isonum_*() closer to style(9).

sys/fs/cd9660/iso.h

@@ -291,56 +291,65 @@ u_short sgetrune(const char *, size_t, char const **, int, void *);
  */
 
 static __inline uint8_t
-isonum_711(unsigned char *p)
+isonum_711(const unsigned char *p)
 {
-	return p[0];
+
+	return (p[0]);
+}
+
+static __inline int8_t
+isonum_712(const unsigned char *p)
+{
+
+	return ((signed char)p[0]);
 }
 
 static __inline uint8_t
-isonum_712(unsigned char *p)
+isonum_713(const unsigned char *p)
 {
-	return p[0];
-}
 
-static __inline uint8_t
+	return (p[0]);
-isonum_713(unsigned char *p)
-{
-	return p[0];
 }
 
 static __inline uint16_t
-isonum_721(unsigned char *p)
+isonum_721(const unsigned char *p)
 {
+
 	return (p[0] | p[1] << 8);
 }
 
 static __inline uint16_t
-isonum_722(unsigned char *p)
+isonum_722(const unsigned char *p)
 {
+
 	return (p[1] | p[0] << 8);
 }
 
 static __inline uint16_t
-isonum_723(unsigned char *p)
+isonum_723(const unsigned char *p)
 {
+
 	return (p[0] | p[1] << 8);
 }
 
 static __inline uint32_t
-isonum_731(unsigned char *p)
+isonum_731(const unsigned char *p)
 {
+
 	return (p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24);
 }
 
 static __inline uint32_t
-isonum_732(unsigned char *p)
+isonum_732(const unsigned char *p)
 {
+
 	return (p[3] | p[2] << 8 | p[1] << 16 | p[0] << 24);
 }
 
 static __inline uint32_t
-isonum_733(unsigned char *p)
+isonum_733(const unsigned char *p)
 {
+
 	return (p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24);
 }