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Allow inserting parts of /dev/urandom with insert-file-contents

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* doc/lispref/files.texi (Reading from Files): Document it.
* src/fileio.c (Finsert_file_contents): Allow specifying END for
special files (bug#18370).
This commit is contained in:
Lars Ingebrigtsen 2022-06-11 14:39:54 +02:00
parent 3675809696
commit cb4579ed6b
3 changed files with 34 additions and 13 deletions
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9
doc/lispref/files.texi
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@ -581,9 +581,12 @@ contents of the file. This is better than simply deleting the buffer
contents and inserting the whole file, because (1) it preserves some
marker positions and (2) it puts less data in the undo list.
It is possible to read a special file (such as a FIFO or an I/O device)
with @code{insert-file-contents}, as long as @var{replace} and
@var{visit} are @code{nil}.
It is possible to read a special file (such as a FIFO or an I/O
device) with @code{insert-file-contents}, as long as @var{replace},
and @var{visit} and @var{beg} are @code{nil}. However, you should
normally use an @var{end} argument for these files to avoid inserting
(potentially) unlimited data into the buffer (for instance, when
inserting data from @file{/dev/urandom}).
@end defun
@defun insert-file-contents-literally filename &optional visit beg end replace