Added library progdocs.

1 files changed, 241 insertions, 1 deletions

diff --git a/lib/ip.c b/lib/ip.c
index 25b4d10..7924290 100644
--- a/lib/ip.c
+++ b/lib/ip.c
@@ -1,7 +1,7 @@
 /*
  *	BIRD Library -- IP address routines common for IPv4 and IPv6
  *
- *	(c) 1998--1999 Martin Mares <mj@ucw.cz>
+ *	(c) 1998--2000 Martin Mares <mj@ucw.cz>
  *
  *	Can be freely distributed and used under the terms of the GNU GPL.
  */
@@ -9,6 +9,21 @@
 #include "nest/bird.h"
 #include "lib/ip.h"
 
+/**
+ * DOC: IP addresses
+ *
+ * BIRD uses its own abstraction of IP address in order to share the same
+ * code for both IPv4 and IPv6. IP addresses are represented as entities
+ * of type &ip_addr which are never to be treated as numbers and instead
+ * they should be manipulated using the following functions and macros.
+ */
+
+/**
+ * ip_scope_text - get texual representation of address scope
+ * @scope: scope (%SCOPE_xxx)
+ *
+ * Returns a pointer to a textual name of the scope given.
+ */
 char *
 ip_scope_text(unsigned scope)
 {
@@ -19,3 +34,228 @@ ip_scope_text(unsigned scope)
   else
     return scope_table[scope];
 }
+
+#if 0
+/**
+ * ipa_equal - compare two IP addresses for equality
+ * @x: IP address
+ * @y: IP address
+ *
+ * ipa_equal() returns 1 if @x and @y represent the same IP address, else 0.
+ */
+int ipa_equal(ip_addr x, ip_addr y) { DUMMY }
+
+/**
+ * ipa_nonzero - test if an IP address is defined
+ * @x: IP address
+ *
+ * ipa_nonzero returns 1 if @x is a defined IP address (not all bits are zero),
+ * else 0.
+ *
+ * The undefined all-zero address is reachable as a |IPA_NONE| macro.
+ */
+int ipa_nonzero(ip_addr x) { DUMMY }
+
+/**
+ * ipa_and - compute bitwise and of two IP addresses
+ * @x: IP address
+ * @y: IP address
+ *
+ * This function returns a bitwise and of @x and @y. It's primarily
+ * used for network masking.
+ */
+ip_addr ipa_and(ip_addr x, ip_addr y) { DUMMY }
+
+/**
+ * ipa_or - compute bitwise or of two IP addresses
+ * @x: IP address
+ * @y: IP address
+ *
+ * This function returns a bitwise or of @x and @y.
+ */
+ip_addr ipa_or(ip_addr x, ip_addr y) { DUMMY }
+
+/**
+ * ipa_xor - compute bitwise xor of two IP addresses
+ * @x: IP address
+ * @y: IP address
+ *
+ * This function returns a bitwise xor of @x and @y.
+ */
+ip_addr ipa_xor(ip_addr x, ip_addr y) { DUMMY }
+
+/**
+ * ipa_not - compute bitwise negation of two IP addresses
+ * @x: IP address
+ *
+ * This function returns a bitwise negation of @x.
+ */
+ip_addr ipa_not(ip_addr x) { DUMMY }
+
+/**
+ * ipa_mkmask - create a netmask
+ * @x: prefix length
+ *
+ * This function returns an &ip_addr corresponding of a netmask
+ * of an address prefix of size @x.
+ */
+ip_addr ipa_mkmask(int x) { DUMMY }
+
+/**
+ * ipa_mkmask - calculate netmask length
+ * @x: IP address
+ *
+ * This function checks whether @x represents a valid netmask and
+ * returns the size of the associate network prefix or -1 for invalid
+ * mask.
+ */
+int ipa_mklen(ip_addr x) { DUMMY }
+
+/**
+ * ipa_hash - hash IP addresses
+ * @x: IP address
+ *
+ * ipa_hash() returns a 16-bit hash value of the IP address @x.
+ */
+int ipa_hash(ip_addr x) { DUMMY }
+
+/**
+ * ipa_hton - convert IP address to network order
+ * @x: IP address
+ *
+ * Converts the IP address @x to the network byte order.
+ *
+ * Beware, this is a macro and it alters the argument!
+ */
+void ipa_hton(ip_addr x) { DUMMY }
+
+/**
+ * ipa_ntoh - convert IP address to host order
+ * @x: IP address
+ *
+ * Converts the IP address @x from the network byte order.
+ *
+ * Beware, this is a macro and it alters the argument!
+ */
+void ipa_ntoh(ip_addr x) { DUMMY }
+
+/**
+ * ipa_classify - classify an IP address
+ * @x: IP address
+ *
+ * ipa_classify() returns an address class of @x, that is a bitwise or
+ * of address type (%IADDR_INVALID, %IADDR_HOST, %IADDR_BROADCAST, %IADDR_MULTICAST)
+ * with adress scope (%SCOPE_HOST to %SCOPE_UNIVERSE) or -1 (%IADDR_INVALID)
+ * for an invalid address.
+ */
+int ipa_classify(ip_addr x) { DUMMY }
+
+/**
+ * ipa_opposite - return address of point-to-point neighbor
+ * @x: IP address of our end of the link
+ *
+ * ipa_opposite() returns an address of the opposite end of a numbered
+ * point-to-point link.
+ *
+ * This function is available in IPv4 version only.
+ */
+ip_addr ipa_opposite(ip_addr x) { DUMMY }
+
+/**
+ * ipa_class_mask - guess netmask according to address class
+ * @x: IP address
+ *
+ * This function (available in IPv4 version only) returns a
+ * network mask according to the address class of @x. Although
+ * classful addressing is nowadays obsolete, there still live
+ * routing protocols transferring no prefix lengths nor netmasks
+ * and this function could be useful to them.
+ */
+ip_addr ipa_classify(ip_addr x) { DUMMY }
+
+/**
+ * ipa_from_u32 - convert IPv4 address to an integer
+ * @x: IP address
+ *
+ * This function takes an IPv4 address and returns its numeric
+ * representation.
+ */
+u32 ipa_from_u32(ip_addr x) { DUMMY }
+
+/**
+ * ipa_to_u32 - convert integer to IPv4 address
+ * @x: a 32-bit integer
+ *
+ * ipa_to_u32() takes a numeric representation of an IPv4 address
+ * and converts it to the corresponding &ip_addr.
+ */
+ip_addr ipa_to_u32(u32 x) { DUMMY }
+
+/**
+ * ipa_compare - compare two IP addresses for order
+ * @x: IP address
+ * @y: IP address
+ *
+ * The ipa_compare() function takes two IP addresses and returns
+ * -1 if @x is less than @y in canonical ordering (lexicographical
+ * order of the bit strings), 1 if @x is greater than @y and 0
+ * if they are the same.
+ */
+int ipa_compare(ip_addr x, ip_addr y) { DUMMY }
+
+/**
+ * ipa_build - build an IPv6 address from parts
+ * @a1: part #1
+ * @a2: part #2
+ * @a3: part #3
+ * @a4: part #4
+ *
+ * ipa_build() takes @a1 to @a4 and assembles them to a single IPv6
+ * address. It's used for example when a protocol wants to bind its
+ * socket to a hard-wired multicast address.
+ */
+ip_addr ipa_build(u32 a1, u32 a2, u32 a3, u32 a4) { DUMMY }
+
+/**
+ * ipa_absolutize - convert link scope IPv6 address to universe scope
+ * @x: link scope IPv6 address
+ * @y: universe scope IPv6 prefix of the interface
+ *
+ * This function combines a link-scope IPv6 address @x with the universe
+ * scope prefix @x of the network assigned to an interface to get a
+ * universe scope form of @x.
+ */
+ip_addr ipa_absolutize(ip_addr x, ip_addr y) { DUMMY }
+
+/**
+ * ip_ntop - convert IP address to textual representation
+ * @a: IP address
+ * @buf: buffer of size at least %STD_ADDRESS_P_LENGTH
+ *
+ * This function takes an IP address and creates its textual
+ * representation for presenting to the user.
+ */
+char *ip_ntop(ip_addr a, char *buf) { DUMMY }
+
+/**
+ * ip_ntox - convert IP address to hexadecimal representation
+ * @a: IP address
+ * @buf: buffer of size at least %STD_ADDRESS_P_LENGTH
+ *
+ * This function takes an IP address and creates its hexadecimal
+ * textual representation. Primary use: debugging dumps.
+ */
+char *ip_ntox(ip_addr a, char *buf) { DUMMY }
+
+/**
+ * ip_pton - parse textual representation of IP address
+ * @a: textual representation
+ * @o: where to put the resulting address
+ *
+ * This function parses a textual IP address representation and
+ * stores the decoded address to a variable pointed to by @o.
+ * Returns 0 if a parse error has occured, else 0.
+ */
+int ip_pton(char *a, ip_addr *o) { DUMMY }
+
+#endif