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README revision 1.9 
      1 $NetBSD: README,v 1.9 1995/03/21 09:04:33 cgd Exp $
      2 
      3 ed is an 8-bit-clean, POSIX-compliant line editor.  It should work with
      4 any regular expression package that conforms to the POSIX interface
      5 standard, such as GNU regex(3).
      6 
      7 If reliable signals are supported (e.g., POSIX sigaction(2)), it should
      8 compile with little trouble.  Otherwise, the macros SPL1() and SPL0()
      9 should be redefined to disable interrupts.
     10 
     11 The following compiler directives are recognized:
     12 DES		- to add encryption support (requires crypt(3))
     13 NO_REALLOC_NULL	- if realloc(3) does not accept a NULL pointer
     14 BACKWARDS	- for backwards compatibility
     15 NEED_INSQUE	- if insque(3) is missing
     16 
     17 The file `POSIX' describes extensions to and deviations from the POSIX
     18 standard.
     19 
     20 The ./test directory contains regression tests for ed. The README
     21 file in that directory explains how to run these.
     22 
     23 For a description of the ed algorithm, see Kernighan and Plauger's book
     24 "Software Tools in Pascal," Addison-Wesley, 1981.
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