diff --git a/TODO b/TODO
index e92d0897c8..e3cd53bcc2 100644
--- a/TODO
+++ b/TODO
@@ -41,7 +41,6 @@ OSX
 ===
 * Cant set register values in OSX debugger
   - This is probably because we are using the 32bit binary on 64bit dbg
-* Add support for OSX/Lion (PIE bins)
 * Proper support for MACH-O binaries
   - rabin2 -f works? i think its used with '-a' 
   - I think symbols are not correct .. (offset+disk)
diff --git a/binr/radare2/radare2.c b/binr/radare2/radare2.c
index dbbf488a02..0652648aa4 100644
--- a/binr/radare2/radare2.c
+++ b/binr/radare2/radare2.c
@@ -211,7 +211,9 @@ int main(int argc, char **argv) {
 	}
 
 	if (fh == NULL) {
-		eprintf ("Cannot open file.\n");
+		if (perms & R_IO_WRITE)
+			eprintf ("Cannot open file for writing.\n");
+		else eprintf ("Cannot open file.\n");
 		return 1;
 	}
 	if (r.file == NULL) // no given file
diff --git a/libr/Makefile b/libr/Makefile
index 157612580f..88966f171d 100644
--- a/libr/Makefile
+++ b/libr/Makefile
@@ -8,8 +8,8 @@ IFX=${DESTDIR}/${INCLUDEDIR}
 PWD=`pwd`
 
 # Libraries
-LIBLIST=util socket cons line lib io lang flags bin hash config syscall cmd
-LIBLIST+=reg asm diff anal print parse search egg bp sign debug fs core
+LIBLIST=util socket db cons line lib io lang flags bin hash config syscall
+LIBLIST+=cmd reg asm diff anal print parse search egg bp sign debug fs core
 #DEPRECATED APIS : LIBLIST+=th crypto
 # sysproxy ... common wat du?
 
diff --git a/libr/core/cmd.c b/libr/core/cmd.c
index 82a7b4ff14..d91d3e2f63 100644
--- a/libr/core/cmd.c
+++ b/libr/core/cmd.c
@@ -68,10 +68,11 @@ static int checkbpcallback(RCore *core) {
 }
 
 static int bypassbp(RCore *core) {
+	RBreakpointItem *bpi;
 	ut64 addr;
 	r_debug_reg_sync (core->dbg, R_REG_TYPE_GPR, R_FALSE);
 	addr = r_debug_reg_get (core->dbg, "pc");
-	RBreakpointItem *bpi = r_bp_get (core->dbg->bp, addr);
+	bpi = r_bp_get (core->dbg->bp, addr);
 	if (!bpi) return R_FALSE;
 	/* XXX 2 if libr/debug/debug.c:226 is enabled */
 	r_debug_step (core->dbg, 1);
@@ -156,9 +157,8 @@ static int cmd_zign(void *data, const char *input) {
 						name = flag->name;
 						r_cons_printf ("zb %s ", name);
 						len = (fcni->size>sizeof (buf))?sizeof (buf):fcni->size;
-						for (i=0; i<len; i++) {
+						for (i=0; i<len; i++)
 							r_cons_printf ("%02x", buf[i]);
-						}
 						r_cons_newline ();
 					} else eprintf ("Unnamed function at 0x%08"PFMT64x"\n", fcni->addr);
 				} else eprintf ("Cannot read at 0x%08"PFMT64x"\n", fcni->addr);
@@ -253,7 +253,7 @@ static int cmd_zign(void *data, const char *input) {
 		break;
 	case '\0':
 	case '*':
-		r_sign_list (core->sign, (input[0]=='*'));
+		r_sign_list (core->sign, (*input=='*'));
 		break;
 	default:
 	case '?':
@@ -1688,13 +1688,12 @@ l = len;
 		}
 		break;
 	case '=':
-		eprintf ("TODO: use zoom.byte to display entropy. like rahash2 -a entropy -b 32 /bin/ls\n");
-		for (i=0; i<core->blocksize; i++) {
-			int pc = (core->block[i]*100)/255;
-			r_print_addr (core->print, core->offset+i);
-			r_cons_printf ("%02x", core->block[i]);
-			r_print_progressbar (core->print, pc, 70);
-			r_cons_newline ();
+		/* TODO: Reimplement using API */ {
+			char *out = r_sys_cmd_strf ("rahash2 -a entropy -b 512 '%s'", core->file->filename);
+			if (out) {
+				r_cons_strcat (out);
+				free (out);
+			}
 		}
 		break;
 	case 'b':
@@ -1916,8 +1915,14 @@ l = len;
 		} else {
 			char *oldzoom = NULL;
 			ut64 maxsize = r_config_get_i (core->config, "zoom.maxsz");
-			ut64 from = r_config_get_i (core->config, "zoom.from");
-			ut64 to = r_config_get_i (core->config, "zoom.to");
+			ut64 from, to;
+			int oldva = core->io->va;
+
+			from = 0;
+			core->io->va = 0;
+			to = r_io_size (core->io);
+			from = r_config_get_i (core->config, "zoom.from");
+			to = r_config_get_i (core->config, "zoom.to");
 			if (input[1] != '\0' && input[1] != ' ') {
 				oldzoom = strdup (r_config_get (core->config, "zoom.byte"));
 				if (!r_config_set (core->config, "zoom.byte", input+1)) {
@@ -1932,12 +1937,14 @@ l = len;
 				r_config_set (core->config, "zoom.byte", oldzoom);
 				free (oldzoom);
 			}
+			if (oldva)
+				core->io->va = oldva;
 		}
 		break;
 	default:
 		r_cons_printf (
 		"Usage: p[fmt] [len]\n"
-		" p= [len]     print byte percentage bars\n"
+		" p=           show entropy bars of full file\n"
 		" p6[de] [len] base64 decode/encode\n"
 		" p8 [len]     8bit hexpair list of bytes\n"
 		" pb [len]     bitstream of N bytes\n"
diff --git a/libr/core/core.c b/libr/core/core.c
index ebac63ca86..f7b5a4c1df 100644
--- a/libr/core/core.c
+++ b/libr/core/core.c
@@ -50,7 +50,7 @@ static ut64 num_callback(RNum *userptr, const char *str, int *ok) {
 		case 'o': return core->io->off;
 		}
 	}
-	if (str[0]>'A') {
+	if (*str>'A') {
 		if ((flag = r_flag_get (core->flags, str))) {
 			ret = flag->offset;
 			*ok = R_TRUE;
@@ -76,7 +76,7 @@ static const char *radare_argv[] = {
 	"#sha1", "#crc32", "#pcprint", "#sha256", "#sha512", "#md4", "#md5", 
 	"#!python", "#!perl", "#!vala",
 	"V",
-	"aa", "ab", "af", "ar", "ag", "at", "av", "a?", 
+	"aa", "ab", "af", "ar", "ag", "at", "a?", 
 	"aga", "agc", "agd", "agl", "agfl",
 	"e", "e-", "e*", "e!",
 	"i", "ii", "iI", "is", "iS", "iz",
@@ -128,7 +128,7 @@ static int autocomplete(RLine *line) {
 			int n, i = 0;
 			int sdelta = 2; //(line->buffer.data[1]==' ')?2:3;
 			if (!line->buffer.data[sdelta]) {
-				path = r_sys_getcwd ();
+				path = r_sys_getdir ();
 			} else {
 				path = strdup (line->buffer.data+sdelta);
 			}
@@ -380,6 +380,7 @@ R_API RCore *r_core_free(RCore *c) {
 	free (c);
 	return NULL;
 }
+
 R_API void r_core_prompt_loop(RCore *r) {
 	int ret;
 	do { 
diff --git a/libr/core/disasm.c b/libr/core/disasm.c
index 762fc3a575..b6cc17369c 100644
--- a/libr/core/disasm.c
+++ b/libr/core/disasm.c
@@ -147,11 +147,16 @@ R_API int r_core_print_disasm(RPrint *p, RCore *core, ut64 addr, ut8 *buf, int l
 			//eprintf ("** invalid opcode at 0x%08"PFMT64x" **\n",
 			//	core->assembler->pc + ret);
 			lastfail = 1;
-			continue;
+			strcpy (asmop.buf_asm, "invalid");
+			sprintf (asmop.buf_hex, "%02x", buf[idx]);
+			//continue;
 		} else lastfail = 0;
 		if (core->inc == 0)
 			core->inc = ret;
-		r_anal_op (core->anal, &analop, at, buf+idx, (int)(len-idx));
+
+		if (lastfail)
+			memset (&analop, 0, sizeof (analop));
+		else r_anal_op (core->anal, &analop, at, buf+idx, (int)(len-idx));
 		{
 			RAnalValue *src;
 			switch (analop.type) {
diff --git a/libr/core/visual.c b/libr/core/visual.c
index 7c2d2f1b03..298fc6d008 100644
--- a/libr/core/visual.c
+++ b/libr/core/visual.c
@@ -169,6 +169,7 @@ R_API int r_core_visual_cmd(RCore *core, int ch) {
 		r_cons_flush ();
 		r_cons_set_raw (0);
 		strcpy (buf, "wx ");
+		r_line_set_prompt ("hex: ");
 		if (r_cons_fgets (buf+3, 1000, 0, NULL) <0) buf[0]='\0';
 		if (*buf) {
 			if (curset) r_core_seek (core, core->offset + cursor, 0);
@@ -200,13 +201,25 @@ R_API int r_core_visual_cmd(RCore *core, int ch) {
 		r_io_sundo_push (core->io);
 		break;
 	case 'G':
+{
+		int ret = 0;
 		if (core->io->va) {
-			ut64 offset = r_io_section_get_vaddr (core->io, core->file->size-core->blocksize);
-			r_core_seek (core, offset, 1);
-		} else
-			r_core_seek (core, core->file->size-core->blocksize, 1);
+			ut64 offset = r_io_section_get_vaddr (core->io, 0);
+			//ut64 offset = r_io_section_get_vaddr (core->io,
+			//	core->file->size-core->blocksize);
+			if (offset == UT64_MAX) {
+				ret = r_core_seek (core, offset, 1);
+				memset (core->block, 0xff, core->blocksize);
+			} else {
+				offset += core->file->size - core->blocksize;
+				ret = r_core_seek (core, offset, 1);
+				memset (core->block, 0xff, core->blocksize);
+			}
+		} else {
+			ret = r_core_seek (core, core->file->size-core->blocksize, 1);
+		}
 		r_io_sundo_push (core->io);
-		//r_core_cmd(core, "s 0", 0);
+}
 		break;
 	case 'h':
 		if (curset) {
@@ -369,10 +382,10 @@ R_API int r_core_visual_cmd(RCore *core, int ch) {
 		core->printidx = (core->printidx-1)%NPF;
 		break;
 	case 'm':
-		r_core_visual_mark (core, r_cons_readchar());
+		r_core_visual_mark (core, r_cons_readchar ());
 		break;
 	case '\'':
-		r_core_visual_mark_seek (core, r_cons_readchar());
+		r_core_visual_mark_seek (core, r_cons_readchar ());
 		break;
 	case 'y':
 		if (ocursor==-1) r_core_yank (core, core->offset+cursor, 1);
diff --git a/libr/db/pair.c b/libr/db/pair.c
index eb70024129..9417dae78c 100644
--- a/libr/db/pair.c
+++ b/libr/db/pair.c
@@ -12,9 +12,9 @@ p.set ("foo", "bar")
 var out = p.get ("foo")
 */
 
-
 R_API RPair *r_pair_new () {
 	RPair *p = R_NEW0 (RPair);
+	p->ht = r_hashtable_new ();
 	p->dbs = r_list_new ();
 	p->dbs->free = (RListFree)sdb_free;
 	return p;
@@ -44,22 +44,45 @@ R_API void r_pair_delete (RPair *p, const char *name) {
 		sdb_delete (sdb, key);
 }
 
+static Sdb *pair_sdb_new(RPair *p, const char *dom, ut32 hdom) {
+	Sdb *sdb;
+	char *old = NULL;
+	if (p->dir) {
+		old = r_sys_getdir ();
+		r_sys_rmkdir (p->dir);
+		r_sys_chdir (p->dir);
+	}
+
+	sdb = sdb_new (dom, 0);
+	if (old) {
+		r_sys_chdir (old);
+		free (old);
+	}
+	r_list_append (p->dbs, sdb);
+	r_hashtable_insert (p->ht, hdom, sdb);
+	return sdb;
+}
+
 R_API char *r_pair_get (RPair *p, const char *name) {
 	Sdb *sdb;
 	ut32 hdom;
-	char *dom, *key = strdup (name);
+	char *dom, *key, *okey = strdup (name);
 
-	dom = r_str_lchr (key, '.');
+	key = okey;
+	dom = r_str_lchr (okey, '.');
 	if (dom) {
-		key = dom+1;
+		char *tmp = okey;
 		*dom = 0;
-		dom = 0;
+		key = dom+1;
+		dom = tmp;
 	} else dom = "";
 	hdom = r_str_hash (dom);
 	sdb = r_hashtable_lookup (p->ht, hdom);
-	if (sdb)
-		return sdb_get (sdb, key);
-	return strdup ("");
+	if (!sdb)
+		sdb = pair_sdb_new (p, dom, hdom);
+	dom = sdb_get (sdb, key);
+	free (okey);
+	return dom;
 }
 
 R_API void r_pair_set (RPair *p, const char *name, const char *value) {
@@ -69,38 +92,76 @@ R_API void r_pair_set (RPair *p, const char *name, const char *value) {
 
 	dom = r_str_lchr (key, '.');
 	if (dom) {
-		key = dom+1;
+		char *okey = key;
 		*dom = 0;
-		dom = 0;
+		key = dom+1;
+		dom = okey;
 	} else dom = "";
 	hdom = r_str_hash (dom);
 	sdb = r_hashtable_lookup (p->ht, hdom);
-	if (!sdb) {
-		sdb = sdb_new (dom, 0);
-		r_hashtable_insert (p->ht, hdom, sdb);
-	}
+	if (!sdb)
+		sdb = pair_sdb_new (p, dom, hdom);
 	sdb_set (sdb, key, value);
 }
 
 R_API RList *r_pair_list (RPair *p, const char *domain) {
+	ut32 hdom = r_str_hash (domain);
+	Sdb *s = r_hashtable_lookup (p->ht, hdom);
+	if (s) {
+		RList *list = r_list_new ();
+		char key[SDB_KEYSIZE];
+		char val[SDB_VALUESIZE];
+		list->free = (RListFree)r_pair_item_free;
+		sdb_dump_begin (s);
+		while (sdb_dump_next (s, key, val))
+			r_list_append (list, r_pair_item_new (key, val));
+		return list;
+	}
 	return NULL;
 }
 
+RPairItem *r_pair_item_new (const char *k, const char *v) {
+	RPairItem *i = R_NEW (RPairItem);
+	i->k = strdup (k);
+	i->v = strdup (v);
+	return i;
+}
+
+R_API void r_pair_item_free (RPairItem *i) {
+	free (i->k);
+	free (i->v);
+	free (i);
+}
+
 R_API void r_pair_set_sync_dir (RPair *p, const char *dir) {
 	free (p->dir);
 	p->dir = strdup (dir);
 }
 
 // use sync dir
-R_API void r_pair_load (RPair *p) {
-	// TODO
+//R_API void r_pair_load (RPair *p) { /* TODO */ }
+
+R_API void r_pair_reset (RPair *p) {
+	Sdb *s;
+	RListIter *iter;
+	r_list_foreach (p->dbs, iter, s)
+		sdb_reset (s);
 }
 
 R_API void r_pair_sync (RPair *p) {
 	Sdb *s;
+	char *old = NULL;
 	RListIter *iter;
-	// chdir
+	if (p->dir) {
+		old = r_sys_getdir ();
+		r_sys_rmkdir (p->dir);
+		r_sys_chdir (p->dir);
+	}
 	r_list_foreach (p->dbs, iter, s) {
 		sdb_sync (s);
 	}
+	if (old) {
+		r_sys_chdir (old);
+		free (old);
+	}
 }
diff --git a/libr/db/sdb/src/lock.c b/libr/db/sdb/src/lock.c
index 707d21a8ad..bb97c0c8c9 100644
--- a/libr/db/sdb/src/lock.c
+++ b/libr/db/sdb/src/lock.c
@@ -6,7 +6,10 @@
 static char buf[128];
 
 const char *sdb_lockfile(const char *f) {
-	int len = strlen (f);
+	int len;
+	if (!f || !*f)
+		return NULL;
+	len = strlen (f);
 	if (len+10>sizeof buf)
 		return NULL;
 	memcpy (buf, f, len);
diff --git a/libr/db/sdb/src/sdb.c b/libr/db/sdb/src/sdb.c
index c6ab7ccb77..4f9f5392b9 100644
--- a/libr/db/sdb/src/sdb.c
+++ b/libr/db/sdb/src/sdb.c
@@ -15,7 +15,7 @@ Sdb* sdb_new (const char *dir, int lock) {
 	if (lock && !sdb_lock (sdb_lockfile (dir)))
 		return NULL;
 	s = malloc (sizeof (Sdb));
-	if (dir) {
+	if (dir && *dir) {
 		s->dir = strdup (dir);
 		s->fd = open (dir, O_RDONLY);
 	} else {
@@ -31,6 +31,17 @@ Sdb* sdb_new (const char *dir, int lock) {
 	return s;
 }
 
+void sdb_file (Sdb* s, const char *dir) {
+	if (s->lock)
+		sdb_unlock (sdb_lockfile (s->dir));
+	free (s->dir);
+	if (dir && *dir)
+	s->dir = strdup (dir);
+	else s->dir = NULL;
+	if (s->lock)
+		sdb_lock (sdb_lockfile (s->dir));
+}
+
 void sdb_free (Sdb* s) {
 	if (!s) return;
 	cdb_free (&s->db);
@@ -97,6 +108,11 @@ int sdb_exists (Sdb* s, const char *key) {
 	return 0;
 }
 
+void sdb_reset (Sdb *s) {
+	ht_free (s->ht);
+	s->ht = ht_new ();
+}
+
 struct sdb_kv* sdb_kv_new (const char *k, const char *v) {
 	struct sdb_kv *kv = R_NEW (struct sdb_kv);
 	strncpy (kv->key, k, sizeof (kv->key)-1);
diff --git a/libr/db/sdb/src/sdb.h b/libr/db/sdb/src/sdb.h
index b07ba62e00..514c79967a 100644
--- a/libr/db/sdb/src/sdb.h
+++ b/libr/db/sdb/src/sdb.h
@@ -28,6 +28,8 @@ typedef struct sdb_kv {
 
 Sdb* sdb_new (const char *dir, int lock);
 void sdb_free (Sdb* s);
+void sdb_file (Sdb* s, const char *dir);
+void sdb_reset (Sdb *s);
 
 int sdb_exists (Sdb*, const char *key);
 int sdb_nexists (Sdb*, const char *key);
diff --git a/libr/db/t/Makefile b/libr/db/t/Makefile
index 10108c4b39..ebbea14c9b 100644
--- a/libr/db/t/Makefile
+++ b/libr/db/t/Makefile
@@ -4,7 +4,10 @@ include ../../config.mk
 
 all: test${EXT_EXE}
 
-test${EXT_EXE}:
+test.o: test.c
+	@echo nothing
+
+test${EXT_EXE}: test.o
 	${CC} -g -I ../../include test.c -L.. -lr_db -lr_util -L../../util -o test${EXT_EXE}
 
 clean:
diff --git a/libr/db/t/test.c b/libr/db/t/test.c
index ce571019bc..c6eaa74edb 100644
--- a/libr/db/t/test.c
+++ b/libr/db/t/test.c
@@ -1,6 +1,9 @@
 /* radare - LGPL - Copyright 2009-2010 pancake<nopcode.org> */
 
+
 #include "r_db.h"
+void test_pair ();
+void test_db();
 
 struct item_t {
 	char city[10];
@@ -12,7 +15,39 @@ struct item_t {
 #define K_CITY R_DB_INDEXOF(struct item_t, city)
 
 int main(int argc, char **argv) {
-	struct r_db_t *db = r_db_new();
+	test_pair ();
+	test_db ();
+	return 0;
+}
+
+void test_pair () {
+	char *s;
+	RPair *p = r_pair_new ();
+	r_pair_set_sync_dir (p, "sdb-db-test");
+
+	r_pair_set (p, "root", "clown");
+	r_pair_set (p, ".branch", "clown");
+	r_pair_set (p, "user.name", "pancake");
+	r_pair_set (p, "user.pass", "password");
+
+	s = r_pair_get (p, "user.name");
+	printf ("user.name=%s\n", s);
+
+	{
+	RPairItem *o;
+	RListIter *iter;
+	RList *list = r_pair_list (p, "user");
+	printf ("DUMP:\n");
+	r_list_foreach (list, iter, o) {
+		printf ("   %s = %s\n", o->k, o->v);
+	}
+	r_list_destroy (list);
+	}
+	r_pair_sync (p);
+}
+
+void test_db() {
+	RDatabase *db = r_db_new ();
 	void **siter;
 	struct item_t *it, tmp;
 
@@ -71,6 +106,4 @@ int main(int argc, char **argv) {
 
 	printf("--> free db\n");
 	r_db_free(db);
-
-	return 0;
 }
diff --git a/libr/include/r_db.h b/libr/include/r_db.h
index 04dbfb6740..a2c20a3954 100644
--- a/libr/include/r_db.h
+++ b/libr/include/r_db.h
@@ -56,8 +56,25 @@ while (r_db_iter_next(it)) {
 }
 #endif
 
+typedef struct r_pair_item_t {
+	char *k, *v;
+} RPairItem;
+
 
 #ifdef R_API
+R_API RPairItem *r_pair_item_new ();
+R_API void r_pair_item_free (RPairItem*);
+
+R_API RPair *r_pair_new ();
+R_API void r_pair_free (RPair *p);
+R_API void r_pair_delete (RPair *p, const char *name);
+R_API char *r_pair_get (RPair *p, const char *name);
+R_API void r_pair_set (RPair *p, const char *name, const char *value);
+R_API RList *r_pair_list (RPair *p, const char *domain);
+R_API void r_pair_set_sync_dir (RPair *p, const char *dir);
+R_API void r_pair_load (RPair *p);
+R_API void r_pair_sync (RPair *p);
+/* */
 R_API struct r_db_t *r_db_new();
 R_API struct r_db_block_t *r_db_block_new();
 R_API int r_db_add_id(struct r_db_t *db, int off, int size);
diff --git a/libr/include/r_util.h b/libr/include/r_util.h
index 6d1b740514..49b4645b7e 100644
--- a/libr/include/r_util.h
+++ b/libr/include/r_util.h
@@ -356,7 +356,8 @@ R_API int r_sys_sleep(int secs);
 R_API int r_sys_usleep(int usecs);
 R_API char *r_sys_getenv(const char *key);
 R_API int r_sys_setenv(const char *key, const char *value);
-R_API char *r_sys_getcwd();
+R_API char *r_sys_getdir();
+R_API int r_sys_chdir(const char *s);
 R_API char *r_sys_cmd_str_full(const char *cmd, const char *input, int *len, char **sterr);
 #if __WINDOWS__
 R_API char *r_sys_cmd_str_w32(const char *cmd);
diff --git a/libr/print/print.c b/libr/print/print.c
index c3b093529d..1d391dc08f 100644
--- a/libr/print/print.c
+++ b/libr/print/print.c
@@ -178,7 +178,7 @@ R_API int r_print_string(RPrint *p, ut64 seek, const ut8 *buf, int len, int wide
 			// TODO: some ascii can be bypassed here
 			p->printf ("%%%02x", buf[i]);
 		} else {
-			if (IS_PRINTABLE (buf[i]))
+			if (buf[i]=='\n' || IS_PRINTABLE (buf[i]))
 				p->printf ("%c", buf[i]);
 			else p->printf ("\\x%02x", buf[i]);
 		}
diff --git a/libr/util/file.c b/libr/util/file.c
index 1a391c1d51..e0ee9dbbcf 100644
--- a/libr/util/file.c
+++ b/libr/util/file.c
@@ -27,14 +27,17 @@ R_API boolt r_file_exist(const char *str) {
 }
 
 R_API char *r_file_abspath(const char *file) {
+	char *ret = NULL;
+	char *cwd = r_sys_getdir ();
 #if __UNIX__
-	if (file[0] != '/')
-		return r_str_dup_printf ("%s/%s", r_sys_getcwd (), file);
+	if (cwd && *file != '/')
+		ret = r_str_dup_printf ("%s/%s", cwd, file);
 #elif __WINDOWS__
-	if (!strchr (file, ':'))
-		return r_str_dup_printf ("%s/%s", r_sys_getcwd (), file);
+	if (cwd && !strchr (file, ':'))
+		ret = r_str_dup_printf ("%s/%s", cwd, file);
 #endif
-	return strdup (file);
+	free (cwd);
+	return ret? ret: strdup (file);
 }
 
 R_API char *r_file_path(const char *bin) {
diff --git a/libr/util/str.c b/libr/util/str.c
index dd57f5b808..2eab938f72 100644
--- a/libr/util/str.c
+++ b/libr/util/str.c
@@ -203,6 +203,7 @@ R_API ut64 r_str_hash64(const char *str) {
 
 R_API ut32 r_str_hash(const char *str) {
 	ut32 ret = 0;
+	if (str)
 	for (; *str; str++)
 		ret ^= (ret<<7 | *str);
 	return ret;
diff --git a/libr/util/sys.c b/libr/util/sys.c
index 7da5f22a7c..56a9d4420b 100644
--- a/libr/util/sys.c
+++ b/libr/util/sys.c
@@ -181,30 +181,30 @@ R_API int r_sys_crash_handler(const char *cmd) {
 #endif
 }
 
-#if __WINDOWS__
 R_API char *r_sys_getenv(const char *key) {
+#if __WINDOWS__
 	static char envbuf[1024];
 	envbuf[0] = 0;
 	GetEnvironmentVariable (key, (LPSTR)&envbuf, sizeof (envbuf));
 	// TODO: handle return value of GEV
-	return strdup (envbuf);
-}
+	return *envbuf? strdup (envbuf): NULL;
 #else
-R_API char *r_sys_getenv(const char *key) {
 	char *b = getenv (key);
-	if (b) return strdup (b);
-	return NULL;
+	return b? strdup (b): NULL;
+#endif
 }
-#endif
 
-R_API char *r_sys_getcwd(void) {
-#if __UNIX__
-	return getcwd (NULL, 0);
-#elif __WINDOWS__
-	return _getcwd (NULL, 0);
+R_API char *r_sys_getdir(void) {
+#if __WINDOWS__
+	char *cwd = _getcwd (NULL, 0);
 #else
-#warning TODO: r_sys_getcwd
+	char *cwd = getcwd (NULL, 0);
 #endif
+	return cwd? strdup (cwd): NULL;
+}
+
+R_API int r_sys_chdir(const char *s) {
+	return chdir (s)==0;
 }
 
 #if __UNIX__
@@ -288,9 +288,9 @@ R_API char *r_sys_cmd_str_full(const char *cmd, const char *input, int *len, cha
 		close (sh_out[0]);
 		close (sh_err[0]);
 		close (sh_in[1]);
-		waitpid(pid, &status, 0);
+		waitpid (pid, &status, 0);
 		if (status != 0) {
-			eprintf("%s: command returned !0\n", __func__);
+			eprintf ("%s: command returned !0\n", __func__);
 			return (NULL);
 		}