From ab1de187e282bde2f19e7a5fd8f20663a474c08f Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Tue, 22 Apr 2025 08:06:44 -0500
Subject: [PATCH] Add printf -r NUM to repeat, with -r 0 acting like "yes".

(Note: you can't output a NUL byte with yes, but can with printf.)
---
 toys/posix/printf.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/toys/posix/printf.c b/toys/posix/printf.c
index c80e6fe4..d56c9aee 100644
--- a/toys/posix/printf.c
+++ b/toys/posix/printf.c
@@ -7,21 +7,27 @@
  *
  * TODO: *m$ ala printf("%1$d:%2$.*3$d:%4$.*3$d\n", hour, min, precision, sec);
 
-USE_PRINTF(NEWTOY(printf, "<1?^", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_MAYFORK))
+USE_PRINTF(NEWTOY(printf, "<1?^r#", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_MAYFORK))
 
 config PRINTF
   bool "printf"
   default y
   help
-    usage: printf FORMAT [ARGUMENT...]
+    usage: printf [-r COUNT] FORMAT [ARGUMENT...]
 
     Format and print ARGUMENT(s) according to FORMAT, using C printf syntax
     (% escapes for cdeEfgGiosuxX, \ escapes for abefnrtv0 or \OCTAL or \xHEX).
+
+    -r	Repeat output COUNT types (0 repeats until killed)
 */
 
 #define FOR_printf
 #include "toys.h"
 
+GLOBALS(
+  long r;
+)
+
 // Detect matching character (return true/false) and advance pointer if match.
 static int chrstart(char **s, char c)
 {
@@ -139,6 +145,12 @@ void printf_main(void)
 
     // Posix says to keep looping through format until we consume all args.
     // This only works if the format actually consumed at least one arg.
-    if (!seen || !*arg) break;
+    if (!seen || !*arg) {
+      if (FLAG(r) && --TT.r) {
+        f = *toys.optargs;
+        arg = toys.optargs+1;
+        if (TT.r<0) TT.r++;
+      } else break;
+    }
   }
 }
-- 
2.39.5