diff --git a/lib/ChangeLog b/lib/ChangeLog
index 3049b95..eec006c 100644
--- a/lib/ChangeLog
+++ b/lib/ChangeLog
@@ -1,3 +1,12 @@
+2004-10-04 Hasso Tepper <hasso at quagga.net>
+
+	* memory.c, memory.h: Make char * argument of strdup functions const.
+	* prefix.c, prefix.h: Make many arguments const. Reorder stuff in
+	  header.
+	* log.h: Make log message const in struct message.
+	* log.c: Fix some indenting.
+	* network.c, network.h: Make second argument of writen() const.
+
 2004-10-03  Hasso Tepper  <hasso at quagga.net>
 
 	* command.h: Introduce SERVICE_NODE for "service <...>" commands.
diff --git a/lib/log.c b/lib/log.c
index 5f6b32f..2090b91 100644
--- a/lib/log.c
+++ b/lib/log.c
@@ -113,7 +113,8 @@
   if (zl->flags & ZLOG_FILE)
     {
       time_print (zl->fp);
-      if (zl->record_priority) fprintf (zl->fp, "%s: ", zlog_priority[priority]);
+      if (zl->record_priority)
+	fprintf (zl->fp, "%s: ", zlog_priority[priority]);
       fprintf (zl->fp, "%s: ", zlog_proto_names[zl->protocol]);
       vfprintf (zl->fp, format, args[ZLOG_FILE_INDEX]);
       fprintf (zl->fp, "\n");
@@ -124,7 +125,8 @@
   if (zl->flags & ZLOG_STDOUT)
     {
       time_print (stdout);
-      if (zl->record_priority) fprintf (stdout, "%s: ", zlog_priority[priority]);
+      if (zl->record_priority)
+	fprintf (stdout, "%s: ", zlog_priority[priority]);
       fprintf (stdout, "%s: ", zlog_proto_names[zl->protocol]);
       vfprintf (stdout, format, args[ZLOG_STDOUT_INDEX]);
       fprintf (stdout, "\n");
@@ -135,7 +137,8 @@
   if (zl->flags & ZLOG_STDERR)
     {
       time_print (stderr);
-      if (zl->record_priority) fprintf (stderr, "%s: ", zlog_priority[priority]);
+      if (zl->record_priority)
+	fprintf (stderr, "%s: ", zlog_priority[priority]);
       fprintf (stderr, "%s: ", zlog_proto_names[zl->protocol]);
       vfprintf (stderr, format, args[ZLOG_STDERR_INDEX]);
       fprintf (stderr, "\n");
@@ -484,7 +487,7 @@
 }
 
 /* Very old hacky version of message lookup function.  Still partly
-   used in bgpd and ospfd. */
+   used in bgpd and ospfd. FIXME Seems that it's not used any more. */
 char *
 mes_lookup (struct message *meslist, int max, int index)
 {
diff --git a/lib/log.h b/lib/log.h
index 8948ea0..defe064 100644
--- a/lib/log.h
+++ b/lib/log.h
@@ -71,7 +71,7 @@
 struct message
 {
   int key;
-  char *str;
+  const char *str;
 };
 
 /* Default logging strucutre. */
diff --git a/lib/memory.c b/lib/memory.c
index faf3f26..8b311ae 100644
--- a/lib/memory.c
+++ b/lib/memory.c
@@ -101,7 +101,7 @@
 
 /* String duplication. */
 char *
-zstrdup (int type, char *str)
+zstrdup (int type, const char *str)
 {
   void *dup;
 
@@ -115,7 +115,7 @@
 #ifdef MEMORY_LOG
 struct 
 {
-  char *name;
+  const char *name;
   unsigned long alloc;
   unsigned long t_malloc;
   unsigned long c_malloc;
@@ -187,7 +187,7 @@
 }
 
 char *
-mtype_zstrdup (const char *file, int line, int type, char *str)
+mtype_zstrdup (const char *file, int line, int type, const char *str)
 {
   char *memory;
 
@@ -230,7 +230,7 @@
 struct memory_list
 {
   int index;
-  char *format;
+  const char *format;
 };
 
 struct memory_list memory_list_lib[] =
diff --git a/lib/memory.h b/lib/memory.h
index 40081fe..c2d595a 100644
--- a/lib/memory.h
+++ b/lib/memory.h
@@ -236,7 +236,7 @@
 void *zcalloc (int type, size_t size);
 void *zrealloc (int type, void *ptr, size_t size);
 void  zfree (int type, void *ptr);
-char *zstrdup (int type, char *str);
+char *zstrdup (int type, const char *str);
 
 void *mtype_zmalloc (const char *file,
 		     int line,
@@ -263,7 +263,7 @@
 char *mtype_zstrdup (const char *file,
 		     int line,
 		     int type,
-		     char *str);
+		     const char *str);
 void memory_init ();
 
 #endif /* _ZEBRA_MEMORY_H */
diff --git a/lib/network.c b/lib/network.c
index d105db4..e1f733c 100644
--- a/lib/network.c
+++ b/lib/network.c
@@ -50,7 +50,7 @@
 
 /* Write nbytes from ptr to fd. */
 int
-writen(int fd, u_char *ptr, int nbytes)
+writen(int fd, const u_char *ptr, int nbytes)
 {
   int nleft;
   int nwritten;
diff --git a/lib/network.h b/lib/network.h
index 0544361..f0a7d4d 100644
--- a/lib/network.h
+++ b/lib/network.h
@@ -24,6 +24,6 @@
 #define _ZEBRA_NETWORK_H
 
 int readn (int, u_char *, int);
-int writen (int, u_char *, int);
+int writen (int, const u_char *, int);
 
 #endif /* _ZEBRA_NETWORK_H */
diff --git a/lib/prefix.c b/lib/prefix.c
index 5a3e71b..d9751e3 100644
--- a/lib/prefix.c
+++ b/lib/prefix.c
@@ -66,7 +66,7 @@
 
 /* If n includes p prefix then return 1 else return 0. */
 int
-prefix_match (struct prefix *n, struct prefix *p)
+prefix_match (const struct prefix *n, const struct prefix *p)
 {
   int offset;
   int shift;
@@ -94,7 +94,7 @@
 
 /* Copy prefix from src to dest. */
 void
-prefix_copy (struct prefix *dest, struct prefix *src)
+prefix_copy (struct prefix *dest, const struct prefix *src)
 {
   dest->family = src->family;
   dest->prefixlen = src->prefixlen;
@@ -127,7 +127,7 @@
  * as '==' (which is different from prefix_cmp).
  */
 int
-prefix_same (struct prefix *p1, struct prefix *p2)
+prefix_same (const struct prefix *p1, const struct prefix *p2)
 {
   if (p1->family == p2->family && p1->prefixlen == p2->prefixlen)
     {
@@ -154,7 +154,7 @@
  * from prefix_same).
  */
 int
-prefix_cmp (struct prefix *p1, struct prefix *p2)
+prefix_cmp (const struct prefix *p1, const struct prefix *p2)
 {
   int offset;
   int shift;
@@ -181,8 +181,8 @@
 }
 
 /* Return prefix family type string. */
-char *
-prefix_family_str (struct prefix *p)
+const char *
+prefix_family_str (const struct prefix *p)
 {
   if (p->family == AF_INET)
     return "inet";
@@ -213,7 +213,7 @@
 
 /* When string format is invalid return 0. */
 int
-str2prefix_ipv4 (char *str, struct prefix_ipv4 *p)
+str2prefix_ipv4 (const char *str, struct prefix_ipv4 *p)
 {
   int ret;
   int plen;
@@ -335,7 +335,7 @@
 
 /* If prefix is 0.0.0.0/0 then return 1 else return 0. */
 int
-prefix_ipv4_any (struct prefix_ipv4 *p)
+prefix_ipv4_any (const struct prefix_ipv4 *p)
 {
   return (p->prefix.s_addr == 0 && p->prefixlen == 0);
 }
@@ -362,7 +362,7 @@
 
 /* If given string is valid return pin6 else return NULL */
 int
-str2prefix_ipv6 (char *str, struct prefix_ipv6 *p)
+str2prefix_ipv6 (const char *str, struct prefix_ipv6 *p)
 {
   char *pnt;
   char *cp;
@@ -399,7 +399,8 @@
   return ret;
 }
 
-/* Convert struct in6_addr netmask into integer. */
+/* Convert struct in6_addr netmask into integer.
+ * FIXME return u_char as ip_maskleni() does. */
 int
 ip6_masklen (struct in6_addr netmask)
 {
@@ -470,7 +471,7 @@
 }
 
 void
-str2in6_addr (char *str, struct in6_addr *addr)
+str2in6_addr (const char *str, struct in6_addr *addr)
 {
   int i;
   unsigned int x;
@@ -503,10 +504,11 @@
   return;
 }
 
-/* Utility function of convert between struct prefix <=> union sockunion */
+/* Utility function of convert between struct prefix <=> union sockunion.
+ * FIXME This function isn't used anywhere. */
 struct prefix *
-sockunion2prefix (union sockunion *dest,
-		  union sockunion *mask)
+sockunion2prefix (const union sockunion *dest,
+		  const union sockunion *mask)
 {
   if (dest->sa.sa_family == AF_INET)
     {
@@ -533,9 +535,9 @@
   return NULL;
 }
 
-/* Utility function of convert between struct prefix <=> union sockunion */
+/* Utility function of convert between struct prefix <=> union sockunion. */
 struct prefix *
-sockunion2hostprefix (union sockunion *su)
+sockunion2hostprefix (const union sockunion *su)
 {
   if (su->sa.sa_family == AF_INET)
     {
@@ -563,7 +565,7 @@
 }
 
 int
-prefix_blen (struct prefix *p)
+prefix_blen (const struct prefix *p)
 {
   switch (p->family) 
     {
@@ -581,7 +583,7 @@
 
 /* Generic function for conversion string to struct prefix. */
 int
-str2prefix (char *str, struct prefix *p)
+str2prefix (const char *str, struct prefix *p)
 {
   int ret;
 
@@ -601,7 +603,7 @@
 }
 
 int
-prefix2str (struct prefix *p, char *str, int size)
+prefix2str (const struct prefix *p, char *str, int size)
 {
   char buf[BUFSIZ];
 
@@ -627,9 +629,10 @@
 }
 
 /* Utility function.  Check the string only contains digit
-   character. */
+ * character.
+ * FIXME str.[c|h] would be better place for this function. */
 int
-all_digit (char *str)
+all_digit (const char *str)
 {
   for (; *str != '\0'; str++)
     if (!isdigit ((int) *str))
@@ -668,7 +671,8 @@
    ex.) "1.1.0.0" "255.255.0.0" => "1.1.0.0/16"
    ex.) "1.0.0.0" NULL => "1.0.0.0/8"                   */
 int
-netmask_str2prefix_str (char *net_str, char *mask_str, char *prefix_str)
+netmask_str2prefix_str (const char *net_str, const char *mask_str,
+			char *prefix_str)
 {
   struct in_addr network;
   struct in_addr mask;
diff --git a/lib/prefix.h b/lib/prefix.h
index 5884640..e4f17ab 100644
--- a/lib/prefix.h
+++ b/lib/prefix.h
@@ -128,43 +128,45 @@
 int afi2family (int);
 int family2afi (int);
 
-int prefix2str (struct prefix *, char *, int);
-int str2prefix (char *, struct prefix *);
 struct prefix *prefix_new ();
-void prefix_free (struct prefix *p);
+void prefix_free (struct prefix *);
+const char *prefix_family_str (const struct prefix *);
+int prefix_blen (const struct prefix *);
+int str2prefix (const char *, struct prefix *);
+int prefix2str (const struct prefix *, char *, int);
+int prefix_match (const struct prefix *, const struct prefix *);
+int prefix_same (const struct prefix *, const struct prefix *);
+int prefix_cmp (const struct prefix *, const struct prefix *);
+void prefix_copy (struct prefix *dest, const struct prefix *src);
+void apply_mask (struct prefix *);
 
-struct prefix_ipv4 *prefix_ipv4_new ();
-void prefix_ipv4_free ();
-int str2prefix_ipv4 (char *, struct prefix_ipv4 *);
-void apply_mask_ipv4 (struct prefix_ipv4 *);
-int prefix_blen (struct prefix *);
-u_char ip_masklen (struct in_addr);
-int prefix_ipv4_any (struct prefix_ipv4 *);
-void masklen2ip (int, struct in_addr *);
-void apply_classful_mask_ipv4 (struct prefix_ipv4 *);
-
-char *prefix_family_str (struct prefix *p);
 struct prefix *sockunion2prefix ();
 struct prefix *sockunion2hostprefix ();
 
+struct prefix_ipv4 *prefix_ipv4_new ();
+void prefix_ipv4_free (struct prefix_ipv4 *);
+int str2prefix_ipv4 (const char *, struct prefix_ipv4 *);
+void apply_mask_ipv4 (struct prefix_ipv4 *);
+
+int prefix_ipv4_any (const struct prefix_ipv4 *);
+void apply_classful_mask_ipv4 (struct prefix_ipv4 *);
+
+u_char ip_masklen (struct in_addr);
+void masklen2ip (int, struct in_addr *);
+int netmask_str2prefix_str (const char *, const char *, char *);
+
 #ifdef HAVE_IPV6
 struct prefix_ipv6 *prefix_ipv6_new ();
-void prefix_ipv6_free ();
-struct prefix *str2routev6 (char *);
-int str2prefix_ipv6 (char *str, struct prefix_ipv6 *p);
-void apply_mask_ipv6 (struct prefix_ipv6 *p);
-void str2in6_addr (char *str, struct in6_addr *addr);
-void masklen2ip6 (int masklen, struct in6_addr *netmask);
-int ip6_masklen (struct in6_addr netmask);
+void prefix_ipv6_free (struct prefix_ipv6 *);
+int str2prefix_ipv6 (const char *, struct prefix_ipv6 *);
+void apply_mask_ipv6 (struct prefix_ipv6 *);
+
+int ip6_masklen (struct in6_addr);
+void masklen2ip6 (int, struct in6_addr *);
+
+void str2in6_addr (const char *, struct in6_addr *);
 #endif /* HAVE_IPV6 */
 
-void apply_mask (struct prefix *);
-int prefix_match (struct prefix *n, struct prefix *p);
-int prefix_same (struct prefix *, struct prefix *);
-int prefix_cmp (struct prefix *, struct prefix *);
-void prefix_copy (struct prefix *, struct prefix *);
-
-int all_digit (char *);
-int netmask_str2prefix_str (char *, char *, char *);
+int all_digit (const char *);
 
 #endif /* _ZEBRA_PREFIX_H */