Follow-up Comment #18, bug #64484 (group groff): Stop the presses. Sure enough, as soon as I pulled the trigger on that reply I realized one reason why there was a difference in output from your _printf_s.
Try these:
$ printf ".ft U-TR\n\X'ps: αβγabc'\nαβγabc"|./build/test-groff -Tpdf
-Kutf8 -Z >| deri-64484-escape.grout2
$ printf ".ft U-TR\n.device ps: αβγabc\nαβγabc"|./build/test-groff
-Tpdf -Kutf8 -Z >| deri-64484-request.grout2
$ cksum deri-64484-escape.grout*
3560394002 244 deri-64484-escape.grout
3560394002 244 deri-64484-escape.grout2
$ cksum deri-64484-request.grout*
1169764700 237 deri-64484-request.grout
1169764700 237 deri-64484-request.grout2
There was a `\c` missing after your `\X` escape sequence. A newline at the
end of a text line puts a word space on the output--a word space that the
`device` request exhibit didn't have.
There still a difference, but it's less.
$ diff -u deri-64484-{escape,request}.grout2
--- deri-64484-escape.grout2 2024-08-26 22:50:56.020617246 -0500
+++ deri-64484-request.grout2 2024-08-26 22:51:00.588597219 -0500
@@ -5,15 +5,14 @@
V12000
H72000
x X ps: \[u03B1]\[u03B2]\[u03B3]abc
-V12000
-H72000
-DFd
-wx font 11 S
+x font 11 S
f11
s10000
x Slant 16
-h2500
+V12000
+H72000
md
+DFd
C*a
h6310
C*b
I'm not sure how material this is.
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