diff --git a/ip4.h b/ip4.h
index b561a4c..83c18ea 100644
--- a/ip4.h
+++ b/ip4.h
@@ -1,9 +1,15 @@
 #ifndef IP4_H
 #define IP4_H
 
-extern unsigned int ip4_scan(const char *src,char *ip);
-extern unsigned int ip4_fmt(char *dest,const char *ip);
+extern unsigned int scan_ip4(const char *src,char *ip);
+extern unsigned int fmt_ip4(char *dest,const char *ip);
+
+/* for djb backwards compatibility */
+#define ip4_scan scan_ip4
+#define ip4_fmt fmt_ip4
 
 #define IP4_FMT 20
 
+extern const char ip4loopback[4]; /* = {127,0,0,1};*/
+
 #endif
diff --git a/ip6.h b/ip6.h
index 97f0697..0314138 100644
--- a/ip6.h
+++ b/ip6.h
@@ -1,11 +1,11 @@
 #ifndef IP6_H
 #define IP6_H
 
-extern unsigned int ip6_scan(const char *src,char *ip);
-extern unsigned int ip6_fmt(char *dest,const char *ip);
+extern unsigned int scan_ip6(const char *src,char *ip);
+extern unsigned int fmt_ip6(char *dest,const char *ip);
 
-extern unsigned int ip6_scan_flat(const char *src,char *);
-extern unsigned int ip6_fmt_flat(char *dest,const char *);
+extern unsigned int scan_ip6_flat(const char *src,char *);
+extern unsigned int fmt_ip6_flat(char *dest,const char *);
 
 /*
  ip6 address syntax: (h = hex digit), no leading '0' required
@@ -23,6 +23,4 @@ extern const unsigned char V6any[16]; /*={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; */
 
 #define ip6_isv4mapped(ip) (byte_equal(ip,12,V4mappedprefix))
 
-extern const char ip4loopback[4]; /* = {127,0,0,1};*/
-
 #endif
diff --git a/socket/fmt_ip4.3 b/socket/fmt_ip4.3
new file mode 100644
index 0000000..9e32ffc
--- /dev/null
+++ b/socket/fmt_ip4.3
@@ -0,0 +1,27 @@
+.TH fmt_ip4 3
+.SH NAME
+fmt_ip4 \- write a formatted ASCII representation of an IPv4 number
+.SH SYNTAX
+.B #include <ip4.h>
+
+unsigned int \fBfmt_ip4\fP(char *\fIdest\fR,const char \fIip\fR[4]);
+.SH DESCRIPTION
+fmt_ip4 formats an IPv4 number in dotted-decimal ASCII representation
+from \fIip\fR and writes the result into \fIdest\fR. It returns the
+number of bytes written.
+
+If \fIdest\fR equals FMT_LEN (i.e. is zero), fmt_ip4 returns the number
+of bytes it would have written.
+
+fmt_ip4 does not append \\0.
+
+For convenience, ip4.h defines the integer IP4_FMT to be big enough to
+contain every possible fmt_ip4 output plus \\0.
+.SH EXAMPLE
+#include <ip4.h>
+
+  char buf[IP4_FMT];
+  char ip[4];
+  buf[fmt_ip4(buf,ip)]=0;
+.SH "SEE ALSO"
+scan_ip4(3), ip6_fmt(3)
diff --git a/socket/ip4_fmt.c b/socket/fmt_ip4.c
similarity index 66%
rename from socket/ip4_fmt.c
rename to socket/fmt_ip4.c
index 1c4932c..78e4327 100644
--- a/socket/ip4_fmt.c
+++ b/socket/fmt_ip4.c
@@ -1,7 +1,7 @@
 #include "fmt.h"
 #include "ip4.h"
 
-unsigned int ip4_fmt(char *s,const char ip[4])
+unsigned int fmt_ip4(char *s,const char ip[4])
 {
   unsigned int len;
   int i;
@@ -10,7 +10,7 @@ unsigned int ip4_fmt(char *s,const char ip[4])
   for (i=0; i<4; ++i) {
     register unsigned int j;
     len+=(j=fmt_ulong(s,(unsigned long) (unsigned char) ip[i]))+1;
-    if (s && i<3) { s+=i; *s++='.'; }
+    if (s && i<3) { s+=j; *s++='.'; }
   }
-  return len;
+  return len-1;
 }
diff --git a/socket/fmt_ip6.3 b/socket/fmt_ip6.3
new file mode 100644
index 0000000..76c3aac
--- /dev/null
+++ b/socket/fmt_ip6.3
@@ -0,0 +1,32 @@
+.TH fmt_ip6 3
+.SH NAME
+fmt_ip6 \- write a formatted ASCII representation of an IPv6 number
+.SH SYNTAX
+.B #include <ip6.h>
+
+unsigned int \fBfmt_ip6\fP(char *\fIdest\fR,const char \fIip\fR[16]);
+.SH DESCRIPTION
+fmt_ip6 formats an IPv6 number in ASCII representation from \fIip\fR and
+writes the result into \fIdest\fR. It returns the number of bytes
+written.
+
+fmt_ip6 will apply "::" compression to the output.
+
+If \fIip\fR is an IPv4-mapped IPv6 address, fmt_ip6 will output the last
+4 bytes as IPv4 number in dotted-decimal notation.
+
+If \fIdest\fR equals FMT_LEN (i.e. is zero), fmt_ip6 returns the number
+of bytes it would have written.
+
+fmt_ip6 does not append \\0.
+
+For convenience, ip6.h defines the integer IP6_FMT to be big enough to
+contain every possible fmt_ip6 output plus \\0.
+.SH EXAMPLE
+#include <ip6.h>
+
+  char buf[IP6_FMT];
+  char ip[16];
+  buf[fmt_ip6(buf,ip)]=0;
+.SH "SEE ALSO"
+scan_ip6(3), ip4_fmt(3)
diff --git a/socket/ip6_fmt.c b/socket/fmt_ip6.c
similarity index 94%
rename from socket/ip6_fmt.c
rename to socket/fmt_ip6.c
index a759a8b..9c224d6 100644
--- a/socket/ip6_fmt.c
+++ b/socket/fmt_ip6.c
@@ -3,7 +3,7 @@
 #include "ip4.h"
 #include "ip6.h"
 
-unsigned int ip6_fmt(char *s,const char ip[16])
+unsigned int fmt_ip6(char *s,const char ip[16])
 {
   unsigned int len;
   unsigned int i;
diff --git a/socket/ip6_fmt_flat.c b/socket/fmt_ip6_flat.c
similarity index 85%
rename from socket/ip6_fmt_flat.c
rename to socket/fmt_ip6_flat.c
index ec3d959..7473666 100644
--- a/socket/ip6_fmt_flat.c
+++ b/socket/fmt_ip6_flat.c
@@ -9,7 +9,7 @@ static char tohex(char num) {
     return -1;
 }
 
-unsigned int ip6_fmt_flat(char *s,const char ip[16])
+unsigned int fmt_ip6_flat(char *s,const char ip[16])
 {
   int i;
   if (!s) return 32;
diff --git a/socket/ip4_fmt.3 b/socket/ip4_fmt.3
deleted file mode 100644
index 95482f7..0000000
--- a/socket/ip4_fmt.3
+++ /dev/null
@@ -1,27 +0,0 @@
-.TH ip4_fmt 3
-.SH NAME
-ip4_fmt \- write a formatted ASCII representation of an IPv4 number
-.SH SYNTAX
-.B #include <ip4.h>
-
-unsigned int \fBip4_fmt\fP(char *\fIdest\fR,const char \fIip\fR[4]);
-.SH DESCRIPTION
-ip4_fmt formats an IPv4 number in dotted-decimal ASCII representation
-from \fIip\fR and writes the result into \fIdest\fR. It returns the
-number of bytes written.
-
-If \fIdest\fR equals FMT_LEN (i.e. is zero), ip4_fmt returns the number
-of bytes it would have written.
-
-ip4_fmt does not append \\0.
-
-For convenience, ip4.h defines the integer IP4_FMT to be big enough to
-contain every possible ip4_fmt output plus \\0.
-.SH EXAMPLE
-#include <ip4.h>
-
-  char buf[IP4_FMT];
-  char ip[4];
-  buf[ip4_fmt(buf,ip)]=0;
-.SH "SEE ALSO"
-ip4_scan(3), ip6_fmt(3)
diff --git a/socket/ip6_fmt.3 b/socket/ip6_fmt.3
deleted file mode 100644
index ef5c129..0000000
--- a/socket/ip6_fmt.3
+++ /dev/null
@@ -1,32 +0,0 @@
-.TH ip6_fmt 3
-.SH NAME
-ip6_fmt \- write a formatted ASCII representation of an IPv6 number
-.SH SYNTAX
-.B #include <ip6.h>
-
-unsigned int \fBip6_fmt\fP(char *\fIdest\fR,const char \fIip\fR[16]);
-.SH DESCRIPTION
-ip6_fmt formats an IPv6 number in ASCII representation from \fIip\fR and
-writes the result into \fIdest\fR. It returns the number of bytes
-written.
-
-ip6_fmt will apply "::" compression to the output.
-
-If \fIip\fR is an IPv4-mapped IPv6 address, ip6_fmt will output the last
-4 bytes as IPv4 number in dotted-decimal notation.
-
-If \fIdest\fR equals FMT_LEN (i.e. is zero), ip6_fmt returns the number
-of bytes it would have written.
-
-ip6_fmt does not append \\0.
-
-For convenience, ip6.h defines the integer IP6_FMT to be big enough to
-contain every possible ip6_fmt output plus \\0.
-.SH EXAMPLE
-#include <ip6.h>
-
-  char buf[IP6_FMT];
-  char ip[16];
-  buf[ip6_fmt(buf,ip)]=0;
-.SH "SEE ALSO"
-ip6_scan(3), ip4_fmt(3)
diff --git a/socket/socket_connect6.c b/socket/socket_connect6.c
index df428e7..bea5358 100644
--- a/socket/socket_connect6.c
+++ b/socket/socket_connect6.c
@@ -9,6 +9,7 @@
 #include "haveip6.h"
 #include "error.h"
 #include "uint32.h"
+#include "ip4.h"
 
 int socket_connect6(int s,const char ip[16],uint16 port,uint32 scope_id)
 {
diff --git a/socket/socket_send6.c b/socket/socket_send6.c
index 75f23e8..5634686 100644
--- a/socket/socket_send6.c
+++ b/socket/socket_send6.c
@@ -7,6 +7,7 @@
 #include "socket.h"
 #include "ip6.h"
 #include "haveip6.h"
+#include "ip4.h"
 
 int socket_send6(int s,const char *buf,unsigned int len,const char ip[16],uint16 port,uint32 scope_id)
 {
diff --git a/t.c b/t.c
index 5113775..c179067 100644
--- a/t.c
+++ b/t.c
@@ -6,13 +6,20 @@
 #include "stralloc.h"
 #include "socket.h"
 #include "buffer.h"
+#include "ip4.h"
 
 #define rdtscl(low) \
      __asm__ __volatile__ ("rdtsc" : "=a" (low) : : "edx")
 
 int main(int argc,char* argv[]) {
+  char buf[100];
+  buf[ip4_fmt(buf,ip4loopback)]=0;
+  buffer_puts(buffer_1small,buf);
+  buffer_flush(buffer_1small);
+#if 0
   buffer_puts(buffer_1small,"hello, world\n");
   buffer_flush(buffer_1small);
+#endif
 #if 0
   int s=socket_tcp4();
   char ip[4]={127,0,0,1};