Creation of the libpsplibc library:

- Implement callback functions needed by newlib
- POSIX environment
- Thread safe alloc/dealloc open/close files
- Changed the way that HEAP is allocated, now by default it uses all available RAM except 512KB/
- Implement a lot of missing functions for having a real POSIX environment (some implementations are dummy because are impossible to do in the PSP OS)
- Adding specific inet changes that previously where in the PSP newlib patch
- Deleting the uncompleted & custom libc library
- Create some weak functions during init of libc process to save some KB if we want to have tiny apps
- Other I/O improvements

src/libc/netdb.c

@@ -0,0 +1,115 @@
+/*
+ * PSP Software Development Kit - https://github.com/pspdev
+ * -----------------------------------------------------------------------
+ * Licensed under the BSD license, see LICENSE in PSPSDK root for details.
+ *
+ * netdb.c - Simple gethostbyname and gethostbyaddr replacements using the resolver lib
+ *
+ * Copyright (c) 2021 Francisco Javier Trujillo Mata <fjtrujy@gmail.com>
+ *
+ */
+
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#include <pspkerneltypes.h>
+#include <pspnet_resolver.h>
+
+#define MAX_NAME 512
+
+#ifdef F_h_errno
+int h_errno = NETDB_SUCCESS;
+#endif
+
+#ifdef F_gethostbyaddr
+struct hostent *gethostbyaddr(const void *addr, int len, int type)
+{
+	static struct hostent ent;
+    static char * aliases[1] = { NULL };
+	char buf[1024];
+	static char sname[MAX_NAME] = "";
+	static struct in_addr saddr = { 0 };
+	static char *addrlist[2] = { (char *) &saddr, NULL };
+	int rid;
+	int err;
+
+	if((len != sizeof(struct in_addr)) || (type != AF_INET) || (addr == NULL))
+	{
+		h_errno = HOST_NOT_FOUND;
+		return NULL;
+	}
+
+	memcpy(&saddr, addr, len);
+
+	if(sceNetResolverCreate(&rid, buf, sizeof(buf)) < 0)
+	{
+		h_errno = NO_RECOVERY;
+		return NULL;
+	}
+
+	err = sceNetResolverStartAtoN(rid, &saddr, sname, sizeof(sname), 2, 3);
+	sceNetResolverStop(rid);
+	sceNetResolverDelete(rid);
+	if(err < 0)
+	{
+		h_errno = HOST_NOT_FOUND;
+		return NULL;
+	}
+
+	ent.h_name = sname;
+	ent.h_aliases = aliases;
+	ent.h_addrtype = AF_INET;
+	ent.h_length = sizeof(struct in_addr);
+	ent.h_addr_list = addrlist;
+	ent.h_addr = (char *) &saddr;
+
+	return &ent;
+}
+#endif
+
+#ifdef F_gethostbyname
+struct hostent *gethostbyname(const char *name)
+{
+	static struct hostent ent;
+	char buf[1024];
+	static char sname[MAX_NAME] = "";
+	static struct in_addr saddr = { 0 };
+	static char *addrlist[2] = { (char *) &saddr, NULL };
+	int rid;
+
+	if(sceNetInetInetAton(name, &saddr) == 0)
+	{
+		int err;
+
+		if(sceNetResolverCreate(&rid, buf, sizeof(buf)) < 0)
+		{
+			h_errno = NO_RECOVERY;
+			return NULL;
+		}
+
+		err = sceNetResolverStartNtoA(rid, name, &saddr, 2, 3);
+		sceNetResolverDelete(rid);
+		if(err < 0)
+		{
+			h_errno = HOST_NOT_FOUND;
+			return NULL;
+		}
+
+	}
+
+	snprintf(sname, MAX_NAME, "%s", name);
+	ent.h_name = sname;
+	ent.h_aliases = 0;
+	ent.h_addrtype = AF_INET;
+	ent.h_length = sizeof(struct in_addr);
+	ent.h_addr_list = addrlist;
+	ent.h_addr = (char *) &saddr;
+
+	return &ent;
+}
+
+#endif