86 lines
2.4 KiB
Plaintext
86 lines
2.4 KiB
Plaintext
Old UNIX V6 ed, lightly ported to modern systems.
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The old UNIX version of 'ed', the line editor. This is
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intended to be for academic interest more than anything and
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perhaps shouldn't be used for any serious editing of system
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files etc. You have been warned! :)
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The binary is named 'ed-v6' so as not to clobber gnu ed.
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There are some major differences between this and POSIX ed
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(see the notes at the end for more info.)
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NOTE: The linked sources are redistributed on github
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with no associated license.
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OPTIONS
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Build a 32 bit binary on x86_64 (Multilib needed):
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M32=yes
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Build a static binary (size is ~ 800k vs. ~ 18k for the
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dynamic):
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STATIC=yes
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DEVELOPER'S NOTES
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1. compile with a K&R compiler (not even ansified);
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replacing =+ with += and using "=" for default
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assignment
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2. assume 32-bits or better (ldiv and ldivr, increasing the
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sbrk to 4096)
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3. use setjmp+longjmp instead of sysexit+reset
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4. use lseek() instead of seek() (although still assumes
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512 bytes)
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5. copies the tempfilename to work on systems without
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writable strings
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6. use SIG_IGN instead of the numeric value "1"
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7. remove the goto errlab since that doesn't work in ANSI C
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8. commented out getpid() in favor of a local copy
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9. renamed unix() to run_unix() because some systems (at
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least some linux) annoyingly do a -Dunix=1
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10. use sizeof(buf) instead of buf
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11. renamed putchar() to putc() because gcc and clang
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generate errors if you create a function called putchar()
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with a different signature.
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12. added a prototype for errfunc() because clang refuses to
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honor `-ansi`
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I've tried to keep these modifications as minimal as
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possible in an effort to preserve the editor that I learned
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unix on.
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`ed.c.orig` is included so you can verify how minimal my
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changes were.
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MAINTAINER'S NOTES
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Compilation:
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Added -D_XOPEN_SOURCE=500 to compile with fcntl.h in
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glibc-2.23.
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Manual page:
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If you are unfamiliar with ed then gnu ed has a very good
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info page.
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This is the closest I can find to the original man page:
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https://freebsd.org/cgi/man.cgi?query=ed&manpath=Unix+Seventh+Edition
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Among other things, there is no -p option, single , or ;
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will throw errors, no G//, and r does not support shell
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commands. H and h are also unsupported, so errors will lack
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any explanation.
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Using with rlwrap:
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This does work with rlwrap, however it repeats every
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command. This doesn't affect the functionality, but it can
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look quite confusing to have everything repeated.
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