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lpr: add more accurate comments
*: trailing whitespace removal
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@ -34,6 +34,9 @@
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* where XXX is the job number and HHHH is the client hostname. Unless a printing helper application
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* is specified lpd is done at this point.
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*
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* NB: file names are produced by peer! They actually may be anything at all!
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* lpd only sanitizes them (by removing most non-alphanumerics).
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*
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* If HELPER-PROG (with optional arguments) is specified then lpd continues to process client data:
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* 1. it reads and parses control file (cfA...). The parse process results in setting environment
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* variables whose values were passed in control file; when parsing is complete, lpd deletes
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@ -50,12 +53,16 @@
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* $M = the user to whom a mail should be sent if a problem occurs
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* $l = name of datafile ("dfAxxx") - file whose content are to be printed
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*
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* lpd also provides $DATAFILE environment variable - the ACTUAL name
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* of the datafile under which it was saved.
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* $l is not reliable (you are at mercy of remote peer), DON'T USE IT.
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*
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* Thus, a typical helper can be something like this:
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* #!/bin/sh
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* cat "$l" >/dev/lp0
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* mv -f "$l" save/
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*
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*/
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#include "libbb.h"
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// strip argument of bad chars
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