New macro to handle zero length

libr/anal/var.c

@@ -334,10 +334,7 @@ R_API RList *r_anal_var_deserialize(const char *ser) {
 			}
 			nxt++;
 		}
-		v->name = NULL;
-		if (i) {
-			v->name = r_str_ndup (ser, i);
-		}
+		v->name = R_STR_NDUP (ser, i);
 		if (!v->name) {
 			goto bad_serial;
 		}
@@ -348,10 +345,7 @@ R_API RList *r_anal_var_deserialize(const char *ser) {
 		for (i = 0; *nxt && *nxt != ','; i++) {
 			nxt++;
 		}
-		v->type = NULL;
-		if (i) {
-			v->type = r_str_ndup (ser, i);
-		}
+		v->type = R_STR_NDUP (ser, i);
 		if (!v->type) {
 			goto bad_serial;
 		}

libr/bin/p/bin_lua.c

@@ -144,10 +144,7 @@ static void addString(const ut8 *buf, ut64 offset, ut64 length, ParseStruct *par
 		return;
 	}
 
-	binstring->string = NULL;
-	if (length > 0) {
-		binstring->string = r_str_ndup ((char *) buf + offset, length);
-	}
+	binstring->string = R_STR_NDUP ((char *) buf + offset, length);
 	binstring->vaddr = binstring->paddr = offset;
 	binstring->ordinal = 0;
 	binstring->size = length;

libr/core/cmd_help.inc.c

@@ -455,10 +455,7 @@ static char *filterFlags(RCore *core, const char *msg) {
 			// find }
 			end = strchr (dollar + 2, '}');
 			if (end) {
-				word = NULL;
-				if (end - dollar - 2 > 0) {
-					word = r_str_ndup (dollar + 2, end - dollar - 2);
-				}
+				word = R_STR_NDUP (dollar + 2, end - dollar - 2);
 				end++;
 			} else {
 				msg = dollar + 1;
@@ -474,10 +471,7 @@ static char *filterFlags(RCore *core, const char *msg) {
 			if (!end) {
 				end = dollar + strlen (dollar);
 			}
-			word = NULL;
-			if (end - dollar - 1 > 0) {
-				word = r_str_ndup (dollar+1, end-dollar-1);
-			}
+			word = R_STR_NDUP (dollar + 1, end - dollar - 1);
 		}
 		if (end && word) {
 			ut64 val = r_num_math (core->num, word);

libr/core/disasm.c

@@ -1283,10 +1283,7 @@ static void ds_build_op_str(RDisasmState *ds, bool print_color) {
 		char **wc_array = r_str_argv (wcdata, &argc);
 		for (i = 0; i < argc; i++) {
 			bgcolor = strchr (wc_array[i], '\x1b');
-			word = NULL;
-			if (bgcolor - wc_array[i]) {
-				word = r_str_ndup (wc_array[i], bgcolor - wc_array[i]);
-			}
+			word = R_STR_NDUP (wc_array[i], bgcolor - wc_array[i]);
 			ds_highlight_word (ds, word, bgcolor);
 		}
 	}

libr/core/panels.c

@@ -3923,10 +3923,7 @@ static char *__get_word_from_canvas_for_menu(RCore *core, RPanels *panels, int x
 		tmp++;
 		i++;
 	}
-	char *ret = NULL;
-	if (i - strlen (padding)) {
-		ret = r_str_ndup (pos += strlen (padding), i - strlen (padding));
-	}
+	char *ret = R_STR_NDUP (pos += strlen (padding), i - strlen (padding));
 	if (!ret) {
 		ret = strdup (pos);
 	}
@@ -6572,10 +6569,7 @@ static char *__parse_panels_config(const char *cfg, int len) {
 	if (R_STR_ISEMPTY (cfg) || len < 2) {
 		return NULL;
 	}
-	char *tmp = NULL;
-	if (len + 1) {
-		tmp = r_str_ndup (cfg, len + 1);
-	}
+	char *tmp = R_STR_NDUP (cfg, len + 1);
 	if (!tmp) {
 		return NULL;
 	}

libr/include/r_util/r_str.h

@@ -65,8 +65,8 @@ typedef struct r_charset_t {
 
 #define R_STR_ISEMPTY(x) (!(x) || !*(x))
 #define R_STR_ISNOTEMPTY(x) ((x) && *(x))
-// XXX must deprecate
 #define R_STR_DUP(x) (((x) != NULL) ? strdup ((x)) : NULL)
+#define R_STR_NDUP(x, len) ((len > 0) ? r_str_ndup (x, len) : NULL)
 #define r_str_array(x,y) ((y >= 0 && y < (sizeof (x) / sizeof (*(x))))?(x)[(y)]: "")
 R_API RCharset *r_charset_new(void);
 R_API void r_charset_free(RCharset *charset);

libr/util/file.c

@@ -1549,10 +1549,7 @@ R_API RList* r_file_glob(const char *_globbed_path, int maxdepth) {
 		if (last_slash) {
 			glob_ptr = last_slash + 1;
 			if (globbed_path[0] == '~') {
-				char *rpath = NULL;
-				if (last_slash - globbed_path - 1) {
-					rpath = r_str_ndup (globbed_path + 2, last_slash - globbed_path - 1);
-				}
+				char *rpath = R_STR_NDUP (globbed_path + 2, last_slash - globbed_path - 1);
 				path = r_file_home (r_str_get (rpath));
 				free (rpath);
 			} else {

libr/util/str.c

@@ -672,10 +672,7 @@ R_API char *r_str_trunc_ellipsis(const char *str, int len) {
 	if (strlen (str) < len) {
 		return strdup (str);
 	}
-	char *buf = NULL;
-	if (len > 0) {
-		buf = r_str_ndup (str, len);
-	}
+	char *buf = R_STR_NDUP (str, len);
 	if (buf && len > 4) {
 		strcpy (buf + len - 4, "...");
 	}
@@ -820,10 +817,7 @@ R_API char *r_str_prepend(char *ptr, const char *string) {
 
 R_API char *r_str_appendlen(char *ptr, const char *string, int slen) {
 	r_return_val_if_fail (string, NULL);
-	char *msg = NULL;
-	if (slen) {
-		msg = r_str_ndup (string, slen);
-	}
+	char *msg = R_STR_NDUP (string, slen);
 	char *ret = r_str_append (ptr, msg);
 	free (msg);
 	return ret;

libr/util/strbuf.c

@@ -130,10 +130,7 @@ R_API bool r_strbuf_slice(RStrBuf *sb, int from, int len) {
 	const char *s = r_strbuf_get (sb);
 	const char *fr = r_str_ansi_chrn (s, from + 1);
 	const char *to = r_str_ansi_chrn (s, from + len + 1);
-	char *r = NULL;
-	if (to > fr) {
-		r = r_str_ndup (fr, to - fr);
-	}
+	char *r = R_STR_NDUP (fr, to - fr);
 	r_strbuf_fini (sb);
 	r_strbuf_init (sb);
 	if (from >= len) {

shlr/ar/ar.c

@@ -64,10 +64,7 @@ static char *name_from_table(ut64 off, filetable *tbl) {
 	if (i == off) {
 		return NULL;
 	}
-	char *res = NULL;
-	if (i - off - 1 > 0) {
-		res = r_str_ndup (buf + off, i - off - 1);
-	}
+	char *res = R_STR_NDUP (buf + off, i - off - 1);
 	return res;
 }