rz-debug: terminate the map start token on NetBSD, OpenBSD and DragonFly

rz_debug_native_map_get() splits a "<start>-<end>" region by copying the
tail into region2, but never terminated region at the '-'. That was
harmless while rz_num_get() stopped at the first character it could not
read; it no longer does, so the start token is now evaluated as a whole
expression:

    0x7fc8124c4000-7fc81278d000  ->  syntax error, 0
    0x400000-0405000             ->  0x3df600, the end read as C octal

Every map then gets a wrong start address. linux_map_get() was fixed when
the parser changed; these three copies were missed. kfbsd.c reads the two
bounds as separate sscanf fields and is unaffected, as is the FreeBSD
map_get, which does not parse text at all.

librz/debug/p/native/dragonfly.c

@@ -325,6 +325,8 @@ static RzList /*<RzDebugMap *>*/ *rz_debug_native_map_get(RzDebug *dbg) {
 			continue;
 		}
 		strncpy(&region2[2], pos_c + 1, sizeof(region2) - 2 - 1);
+		// Terminate the start token at the '-'
+		*pos_c = 0;
 
 		if (!*name) {
 			snprintf(name, sizeof(name), "unk%d", unk++);
@@ -573,4 +575,4 @@ RzDebugPlugin rz_debug_plugin_native = {
 	.breakpoint = rz_debug_native_bp,
 	.drx = rz_debug_native_drx,
 	.gcore = rz_debug_gcore,
-};
+};

librz/debug/p/native/netbsd.c

@@ -345,6 +345,8 @@ static RzList /*<RzDebugMap *>*/ *rz_debug_native_map_get(RzDebug *dbg) {
 			continue;
 		}
 		strncpy(&region2[2], pos_c + 1, sizeof(region2) - 2 - 1);
+		// Terminate the start token at the '-'
+		*pos_c = 0;
 
 		if (!*name) {
 			snprintf(name, sizeof(name), "unk%d", unk++);
@@ -598,4 +600,4 @@ RzDebugPlugin rz_debug_plugin_native = {
 	.breakpoint = rz_debug_native_bp,
 	.drx = rz_debug_native_drx,
 	.gcore = rz_debug_gcore,
-};
+};

librz/debug/p/native/openbsd.c

@@ -348,6 +348,8 @@ static RzList /*<RzDebugMap *>*/ *rz_debug_native_map_get(RzDebug *dbg) {
 			continue;
 		}
 		strncpy(&region2[2], pos_c + 1, sizeof(region2) - 2 - 1);
+		// Terminate the start token at the '-'
+		*pos_c = 0;
 
 		if (!*name) {
 			snprintf(name, sizeof(name), "unk%d", unk++);