LibC: Implement endiannes and ip address functions

libc/CMakeLists.txt

@@ -3,6 +3,7 @@ cmake_minimum_required(VERSION 3.26)
 project(libc CXX ASM)
 
 set(LIBC_SOURCES
+	arpa/inet.cpp
 	assert.cpp
 	ctype.cpp
 	dirent.cpp

libc/arpa/inet.cpp

@@ -0,0 +1,52 @@
+#include <BAN/Endianness.h>
+
+#include <arpa/inet.h>
+#include <errno.h>
+#include <stdio.h>
+
+uint32_t htonl(uint32_t hostlong)
+{
+	return BAN::host_to_network_endian(hostlong);
+}
+
+uint16_t htons(uint16_t hostshort)
+{
+	return BAN::host_to_network_endian(hostshort);
+}
+
+uint32_t ntohl(uint32_t netlong)
+{
+	return BAN::host_to_network_endian(netlong);
+}
+
+uint16_t ntohs(uint16_t netshort)
+{
+	return BAN::host_to_network_endian(netshort);
+}
+
+in_addr_t inet_addr(const char* cp)
+{
+	uint32_t a = 0, b = 0, c = 0, d = 0;
+	int ret = sscanf(cp, "%u.%u.%u.%u", &a, &b, &c, &d);
+	if (ret < 1 || ret > 4)
+		return (in_addr_t)(-1);
+	uint32_t result = 0;
+	result |= (ret == 1) ? a : a << 24;
+	result |= (ret == 2) ? b : b << 16;
+	result |= (ret == 3) ? c : c <<  8;
+	result |= (ret == 4) ? d : d <<  0;
+	return htonl(result);
+}
+
+char* inet_ntoa(struct in_addr in)
+{
+	static char buffer[16];
+	uint32_t he = ntohl(in.s_addr);
+	sprintf(buffer, "%u.%u.%u.%u",
+		(he >> 24) & 0xFF,
+		(he >> 16) & 0xFF,
+		(he >>  8) & 0xFF,
+		(he >>  0) & 0xFF
+	);
+	return buffer;
+}