I got lost in the opening of this post on reddit.
if (sscanf(buf, "%i", &mode) != 1 || TRUE) be rewritten to
if (TRUE)? Does this assume that the
sscanf never fails?
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I think it's assuming that even if sscanf does fail, it doesn't care.
Since the result is being ignored, I don't see the point of having this within the "if" at all. I would guess that the sscanf call was originally on its own, then duff data started arriving (in buf) and messing up the sscanf call, so the "|| TRUE" was added to suppress the error. Classic, Quick and Dirty fix.
Personally, I'd prefer to see this reworked:
sscanf( buf, "%i", &mode ); /* buf may or may not contain a valid mode */
Of course, the data item addressed by &mode might well be left in an inconsistent state - possibly a value parsed from buf, possibly not - but this code doesn't care either way.