Fix #29

Limit all xstrlcpy() calls by dest length.
Escape filenames in system(3) calls.

nnn.c

@@ -1102,9 +1102,9 @@ show_stats(char* fpath, char* fname, struct stat *sb)
 	if (S_ISREG(sb->st_mode)) {
 		/* Show file(1) output */
 		strcpy(buf, "file -b \"");
-		xstrlcpy(buf + strlen(buf), fpath, strlen(fpath) + 1);
+		xstrlcpy(buf + strlen(buf), fpath, sizeof(buf) - strlen(buf));
 		strcat(buf, "\" 2>&1");
-		p = get_output(buf, PATH_MAX + 16);
+		p = get_output(buf, sizeof(buf));
 		if (p) {
 			dprintf(fd, "\n\n ");
 			while (*p) {
@@ -1139,12 +1139,12 @@ show_mediainfo(const char* fpath, int full)
 	if (get_output(buf, MAX_CMD_LEN) == NULL)
 		return -1;
 
-	strcpy(buf, "mediainfo \"");
-	xstrlcpy(buf + strlen(buf), fpath, strlen(fpath) + 1);
+	strcpy(buf, "mediainfo \'");
+	xstrlcpy(buf + strlen(buf), fpath, sizeof(buf) - strlen(buf));
 	if (full)
-		strcat(buf, "\" -f ");
+		strcat(buf, "\' -f ");
 	else
-		strcat(buf, "\" ");
+		strcat(buf, "\' ");
 	sprintf(buf + strlen(buf), "2>&1 | %s", xgetenv("PAGER", "less"));
 
 	return system(buf);
@@ -1569,9 +1569,9 @@ nochange:
 
 				/* If NNN_OPENER is set, use it */
 				if (opener) {
-					sprintf(cmd, "%s \"", opener);
-					xstrlcpy(cmd + strlen(cmd), newpath, strlen(newpath) + 1);
-					strcat(cmd, "\" > /dev/null 2>&1");
+					sprintf(cmd, "%s \'", opener);
+					xstrlcpy(cmd + strlen(cmd), newpath, sizeof(cmd) - strlen(cmd));
+					strcat(cmd, "\' > /dev/null 2>&1");
 					r = system(cmd);
 					continue;
 				}
@@ -1579,9 +1579,9 @@ nochange:
 				/* Play with nlay if identified */
 				mime = getmime(dents[cur].name);
 				if (mime) {
-					strcpy(cmd, "nlay \"");
-					xstrlcpy(cmd + strlen(cmd), newpath, strlen(newpath) + 1);
-					sprintf(cmd + strlen(cmd), "\" %s", mime);
+					strcpy(cmd, "nlay \'");
+					xstrlcpy(cmd + strlen(cmd), newpath, sizeof(cmd) - strlen(cmd));
+					sprintf(cmd + strlen(cmd), "\' %s", mime);
 					exitcurses();
 					r = system(cmd);
 					initcurses();
@@ -1590,9 +1590,9 @@ nochange:
 
 				/* If nlay doesn't handle it, open plain text
 				   files with vi, then try NNN_FALLBACK_OPENER */
-				strcpy(cmd, "file -bi \"");
-				xstrlcpy(cmd + strlen(cmd), newpath, strlen(newpath) + 1);
-				strcat(cmd, "\"");
+				strcpy(cmd, "file -bi \'");
+				xstrlcpy(cmd + strlen(cmd), newpath, sizeof(cmd) - strlen(cmd));
+				strcat(cmd, "\'");
 				if (get_output(cmd, MAX_CMD_LEN) == NULL)
 					continue;
 
@@ -1603,9 +1603,9 @@ nochange:
 					initcurses();
 					continue;
 				} else if (fb_opener) {
-					sprintf(cmd, "%s \"", fb_opener);
-					xstrlcpy(cmd + strlen(cmd), newpath, strlen(newpath) + 1);
-					strcat(cmd, "\" > /dev/null 2>&1");
+					sprintf(cmd, "%s \'", fb_opener);
+					xstrlcpy(cmd + strlen(cmd), newpath, sizeof(cmd) - strlen(cmd));
+					strcat(cmd, "\' > /dev/null 2>&1");
 					r = system(cmd);
 					continue;
 				}