\pdffilesize and spaces

[Taylor, P]

\def \show #1{\message {\string #1 = #1}}

\edef \test {\pdffilesize {file_1.tex}} \show \test

\edef \test {\pdffilesize {file_1.tex }} \show \test

\edef \test {\pdffilesize {"file_1"}} \show \test

\edef \test {\pdffilesize {"file_1 "}} \show \test

\end

->

This is pdfTeX, Version 3.14159265-2.6-1.40.17 (TeX Live 2016/W32TeX) (preloaded format=pdftex)

restricted \write18 enabled.

entering extended mode

(./file_1.tex \test = 259 \test = 259 \test = 259 \test = )

No pages of output.

Transcript written on file_1.log.

UNIV: Windows 7 Enterprise (64 bit), TeX Live 2016, PdfTeX.
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