Support use of `*` in format strings without an index.

This allows `*` to be used in C fashion, without specifying an argument
index to use. Like C, this results in the argument *preceding* the value
for the format specifier itself.

1 files changed, 8 insertions, 0 deletions

diff --git a/core/fmt/fmt.odin b/core/fmt/fmt.odin
index 51e70f6b7..2fe6d3350 100644
--- a/core/fmt/fmt.odin
+++ b/core/fmt/fmt.odin
@@ -613,6 +613,10 @@ wprintf :: proc(w: io.Writer, fmt: string, args: ..any, flush := true, newline :
 			i += 1
 			width_index, _, index_ok := _arg_number(fmt, &i, len(args))
 
+			if !index_ok {
+				width_index, index_ok = error_check_arg(fi, false, unused_args^)
+			}
+
 			if index_ok {
 				unused_args^ -= {width_index}
 
@@ -638,6 +642,10 @@ wprintf :: proc(w: io.Writer, fmt: string, args: ..any, flush := true, newline :
 				i += 1
 				precision_index, _, index_ok := _arg_number(fmt, &i, len(args))
 
+				if !index_ok {
+					precision_index, index_ok = error_check_arg(fi, false, unused_args^)
+				}
+
 				if index_ok {
 					unused_args^ -= {precision_index}
 					fi.prec, _, fi.prec_set = int_from_arg(args, precision_index)