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