Use vis(3) instead of handrolled function.

cmd-server-info.c

@@ -23,6 +23,7 @@
 #include <string.h>
 #include <time.h>
 #include <unistd.h>
+#include <vis.h>
 
 #include "tmux.h"
 
@@ -156,8 +157,8 @@ cmd_server_info_exec(unused struct cmd *self, struct cmd_ctx *ctx)
 				    ent->code, ent->name);
 				break;
 			case TTYCODE_STRING:
-				clean_string(
-				    code->value.string, out, sizeof out);
+				strnvis(out, code->value.string, sizeof out,
+				    VIS_OCTAL|VIS_TAB|VIS_NL);
 				ctx->print(ctx, "%2u: %s: (string) %s",
 				    ent->code, ent->name, out);
 				break;

util.c

@@ -50,23 +50,3 @@ section_string(char *buf, size_t len, size_t sectoff, size_t sectlen)
 	    (int) (last - first), buf + first, last == len ? "" : "...");
 	return (s);
 }
-
-/* Clean string of invisible characters. */
-void
-clean_string(const char *in, char *buf, size_t len)
-{
-	const u_char	*cp;
-	size_t	 	 off;
-
-	off = 0;
-	for (cp = in; *cp != '\0'; cp++) {
-		if (off >= len)
-			break;
-		if (*cp >= 0x20 && *cp <= 0x7f)
-			buf[off++] = *cp;
-		else
-			off += xsnprintf(buf + off, len - off, "\\%03hho", *cp);
-	}
-	if (off < len)
-		buf[off] = '\0';
-}