Some consts for function arguments

Patch from Pavel Tvrdik

lib/ip.c

@@ -233,7 +233,7 @@ ip6_ntop(ip6_addr a, char *b)
 }
 
 int
-ip4_pton(char *a, ip4_addr *o)
+ip4_pton(const char *a, ip4_addr *o)
 {
   int i;
   unsigned long int l;
@@ -258,11 +258,11 @@ ip4_pton(char *a, ip4_addr *o)
 }
 
 int
-ip6_pton(char *a, ip6_addr *o)
+ip6_pton(const char *a, ip6_addr *o)
 {
   u16 words[8];
   int i, j, k, l, hfil;
-  char *start;
+  const char *start;
 
   if (a[0] == ':')			/* Leading :: */
   {

lib/ip.h

@@ -446,8 +446,8 @@ static inline char * ip4_ntox(ip4_addr a, char *b)
 static inline char * ip6_ntox(ip6_addr a, char *b)
 { return b + bsprintf(b, "%08x.%08x.%08x.%08x", _I0(a), _I1(a), _I2(a), _I3(a)); }
 
-int ip4_pton(char *a, ip4_addr *o);
-int ip6_pton(char *a, ip6_addr *o);
+int ip4_pton(const char *a, ip4_addr *o);
+int ip6_pton(const char *a, ip6_addr *o);
 
 // XXXX these functions must be redesigned or removed
 #ifdef IPV6

lib/patmatch.c

@@ -16,7 +16,7 @@
 #endif
 
 int
-MATCH_FUNC_NAME(byte *p, byte *s)
+MATCH_FUNC_NAME(const byte *p, const byte *s)
 {
   while (*p)
     {

lib/string.h

@@ -22,6 +22,6 @@ int buffer_vprint(buffer *buf, const char *fmt, va_list args);
 int buffer_print(buffer *buf, const char *fmt, ...);
 void buffer_puts(buffer *buf, const char *str);
 
-int patmatch(byte *pat, byte *str);
+int patmatch(const byte *pat, const byte *str);
 
 #endif

lib/unaligned.h

@@ -20,7 +20,7 @@
 #include "lib/string.h"
 
 static inline u16
-get_u16(void *p)
+get_u16(const void *p)
 {
   u16 x;
   memcpy(&x, p, 2);
@@ -28,7 +28,7 @@ get_u16(void *p)
 }
 
 static inline u32
-get_u32(void *p)
+get_u32(const void *p)
 {
   u32 x;
   memcpy(&x, p, 4);