Libraries: Create top level directory for libraries.

Things were getting a little crowded in the project root, so this patch
moves the Lib*/ directories into Libraries/.

Libraries/LibC/arpa/inet.cpp

@@ -0,0 +1,59 @@
+#include <arpa/inet.h>
+#include <errno.h>
+#include <netinet/in.h>
+#include <stdio.h>
+
+extern "C" {
+
+const char* inet_ntop(int af, const void* src, char* dst, socklen_t len)
+{
+    if (af != AF_INET) {
+        errno = EAFNOSUPPORT;
+        return nullptr;
+    }
+    auto* bytes = (const unsigned char*)src;
+    snprintf(dst, len, "%u.%u.%u.%u", bytes[0], bytes[1], bytes[2], bytes[3]);
+    return (const char*)dst;
+}
+
+int inet_pton(int af, const char* src, void* dst)
+{
+    if (af != AF_INET) {
+        errno = EAFNOSUPPORT;
+        return -1;
+    }
+    unsigned a;
+    unsigned b;
+    unsigned c;
+    unsigned d;
+    int count = sscanf(src, "%u.%u.%u.%u", &a, &b, &c, &d);
+    if (count != 4) {
+        errno = EINVAL;
+        return 0;
+    }
+    union {
+        struct {
+            uint8_t a;
+            uint8_t b;
+            uint8_t c;
+            uint8_t d;
+        };
+        uint32_t l;
+    } u;
+    u.a = a;
+    u.b = b;
+    u.c = c;
+    u.d = d;
+    *(uint32_t*)dst = u.l;
+    return 1;
+}
+
+in_addr_t inet_addr(const char* str)
+{
+    in_addr_t tmp;
+    int rc = inet_pton(AF_INET, str, &tmp);
+    if (rc < 0)
+        return INADDR_NONE;
+    return tmp;
+}
+}

Libraries/LibC/arpa/inet.h

@@ -0,0 +1,42 @@
+#pragma once
+
+#include <endian.h>
+#include <sys/cdefs.h>
+#include <sys/socket.h>
+
+__BEGIN_DECLS
+
+#define INET_ADDRSTRLEN 16
+
+const char* inet_ntop(int af, const void* src, char* dst, socklen_t);
+int inet_pton(int af, const char* src, void* dst);
+
+inline uint16_t htons(uint16_t value)
+{
+#if BYTE_ORDER == LITTLE_ENDIAN
+    return __builtin_bswap16(value);
+#else
+    return value;
+#endif
+}
+
+inline uint16_t ntohs(uint16_t value)
+{
+    return htons(value);
+}
+
+inline uint32_t htonl(uint32_t value)
+{
+#if BYTE_ORDER == LITTLE_ENDIAN
+    return __builtin_bswap32(value);
+#else
+    return value;
+#endif
+}
+
+inline uint32_t ntohl(uint32_t value)
+{
+    return htonl(value);
+}
+
+__END_DECLS