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