Fix warnings by using more r_str_ncpy

* Fix wrong logic in visual_search

When the string to be searched is wrapped in " ", you want to remove the
first and last quotes and look only for the internal string.

* Increase size to prevent string truncation (and fix compiler warning)
* Fix "destination unchanged after copying no bytes" warning
* Move msp430_register_names where it belongs to
* Fix Wstringop-truncation warning

libr/anal/esil2reil.c

@@ -59,7 +59,7 @@ RAnalReilArg *reil_pop_arg(RAnalEsil *esil) {
 	for (i = 0; i < len; i++) {
 		if (buf[i] == ':') {
 			tmp_buf[j] = '\0';
-			strncpy (op->name, tmp_buf, sizeof (op->name) - 1);
+			r_str_ncpy (op->name, tmp_buf, sizeof (op->name));
 			memset (tmp_buf, 0, sizeof (tmp_buf));
 			j = 0;
 			flag = 1;
@@ -76,8 +76,8 @@ RAnalReilArg *reil_pop_arg(RAnalEsil *esil) {
 
 	// If we have not encountered a ':' we don't know the size yet.
 	if (!flag) {
-		strncpy(op->name, tmp_buf, sizeof(op->name) - 1);
-		op->type = reil_get_arg_type(esil, op->name);
+		r_str_ncpy (op->name, tmp_buf, sizeof (op->name));
+		op->type = reil_get_arg_type (esil, op->name);
 		if (op->type == ARG_REG) {
 			op->size = esil_internal_sizeof_reg(esil, op->name);
 		} else if (op->type == ARG_CONST) {

libr/asm/arch/arm/armass.c

@@ -665,8 +665,7 @@ static st32 getlistmask(char *input) {
 		for (i = 0; input[i] != ',' && input[i] != '\0'; i++) {
 			;
 		}
-		strncpy (temp, input, i);
-		temp[i] = 0;
+		r_str_ncpy (temp, input, i + 1);
 
 		input += i;
 		if (*input != '\0') {

libr/asm/arch/msp430/msp430_disas.c

@@ -3,6 +3,25 @@
 
 #include "msp430_disas.h"
 
+static const char *msp430_register_names[] = {
+	"pc",
+	"sp",
+	"sr",
+	"cg",
+	"r4",
+	"r5",
+	"r6",
+	"r7",
+	"r8",
+	"r9",
+	"r10",
+	"r11",
+	"r12",
+	"r13",
+	"r14",
+	"r15",
+};
+
 static const char *two_op_instrs[] = {
 	[MSP430_MOV]	= "mov",
 	[MSP430_ADD]	= "add",

libr/asm/arch/msp430/msp430_disas.h

@@ -72,25 +72,6 @@ enum msp430_registers {
 	MSP430_R15,
 };
 
-static const char *msp430_register_names[] = {
-	"pc",
-	"sp",
-	"sr",
-	"cg",
-	"r4",
-	"r5",
-	"r6",
-	"r7",
-	"r8",
-	"r9",
-	"r10",
-	"r11",
-	"r12",
-	"r13",
-	"r14",
-	"r15",
-};
-
 struct msp430_cmd {
 	ut8 type;
 	ut8	opcode;

libr/core/visual.c

@@ -771,23 +771,22 @@ static void findPrevWord(RCore *core) {
 static void visual_search(RCore *core) {
 	const ut8 *p;
 	int len, d = core->print->cur;
-	char str[128], buf[258];
+	char str[128], buf[sizeof (str) * 2 + 1];
 
 	r_line_set_prompt ("search byte/string in block: ");
 	r_cons_fgets (str, sizeof (str), 0, NULL);
 	len = r_hex_str2bin (str, (ut8 *) buf);
 	if (*str == '"') {
-		char *e = strncpy (buf + 1, str + 1, sizeof (buf) - 1);
-		if (e) {
-			e--;
-			if (*e == '"') {
-				*e = 0;
-			}
-		}
+		r_str_ncpy (buf, str + 1, sizeof (buf));
 		len = strlen (buf);
+		char *e = buf + len - 1;
+		if (e > buf && *e == '"') {
+			*e = 0;
+			len--;
+		}
 	} else if (len < 1) {
-		strncpy (buf, str, sizeof (buf) - 1);
-		len = strlen (str);
+		r_str_ncpy (buf, str, sizeof (buf));
+		len = strlen (buf);
 	}
 	p = r_mem_mem (core->block + d, core->blocksize - d,
 		(const ut8 *) buf, len);

libr/debug/dreg.c

@@ -219,7 +219,7 @@ R_API int r_debug_reg_list(RDebug *dbg, int type, int size, int rad, const char
 			case 2:
 				{
 					int len, highlight = use_color && pr && pr->cur_enabled && itmidx == pr->cur;
-					char *str, whites[32], content[128];
+					char *str, whites[32], content[300];
 					const char *a = "", *b = "";
 					if (highlight) {
 						a = Color_INVERT;

libr/fs/shell.c

@@ -118,7 +118,7 @@ R_API int r_fs_shell_prompt(RFSShell* shell, RFS* fs, const char* root) {
 			eprintf ("%s\n", path);
 		} else if (!memcmp (buf, "cd ", 3)) {
 			char opath[PROMPT_PATH_BUFSIZE];
-			strncpy (opath, path, sizeof (opath) - 1);
+			r_str_ncpy (opath, path, sizeof (opath));
 			input = buf + 3;
 			while (*input == ' ') {
 				input++;

libr/include/r_util/r_str.h

@@ -39,10 +39,10 @@ R_API bool r_str_range_in(const char *r, ut64 addr);
 R_API int r_str_len_utf8(const char *s);
 R_API int r_str_len_utf8char(const char *s, int left);
 R_API void r_str_filter_zeroline(char *str, int len);
-R_API int r_str_utf8_codepoint (const char* s, int left);
-R_API bool r_str_char_fullwidth (const char* s, int left);
+R_API int r_str_utf8_codepoint(const char *s, int left);
+R_API bool r_str_char_fullwidth(const char *s, int left);
 R_API int r_str_write(int fd, const char *b);
-R_API void r_str_ncpy(char *dst, const char *src, int n);
+R_API void r_str_ncpy(char *dst, const char *src, size_t n);
 R_API void r_str_sanitize(char *c);
 R_API const char *r_str_casestr(const char *a, const char *b);
 R_API const char *r_str_firstbut(const char *s, char ch, const char *but);

libr/util/str.c

@@ -744,8 +744,14 @@ R_API char *r_str_newf(const char *fmt, ...) {
 }
 
 // Secure string copy with null terminator (like strlcpy or strscpy but ours
-R_API void r_str_ncpy(char *dst, const char *src, int n) {
+R_API void r_str_ncpy(char *dst, const char *src, size_t n) {
 	int i;
+
+	// do not do anything if n is 0
+	if (n == 0) {
+		return;
+	}
+
 	n--;
 	for (i = 0; src[i] && n > 0; i++, n--) {
 		dst[i] = src[i];