This is recent R-devel, but AFAICT all R versions are affected.
Also AFAICT, currently only happens on macOS with Aqua, and on
Windows, unless you are in RTerm. These do not use R_Consolefile
Code to reproduce:
x <- paste0(strrep(".", 8191), "MIA")
nchar(x)
#> [1] 8194
## This is fine:
cat(x, file = stdout())
## This truncates silently:
cat(x, file = stderr())
It happens because the vfprintf callback of stderr() is stderr_vfprintf [1],
and that just calls REvprintf [2], which truncates at 8191 characters [3], if
R_Consolefile is not used.
[1]
https://github.com/wch/r-source/blob/fed0444824567e1c4edff234fc5c2fb1c99bbc84/src/main/connections.c#L5122[2]
https://github.com/wch/r-source/blob/fed0444824567e1c4edff234fc5c2fb1c99bbc84/src/main/connections.c#L2562[3]
https://github.com/wch/r-source/blob/fed0444824567e1c4edff234fc5c2fb1c99bbc84/src/main/printutils.c#L972______________________________________________
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