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############################################################################
#
# File: ipatch.icn
#
# Subject: Program to patch iconx path in executable
#
# Author: Gregg M. Townsend
#
# Date: November 15, 2000
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# Usage: ipatch file path
#
# Ipatch changes the path to iconx, the Icon interpreter, that is
# embedded in an Icon executable file under Unix. Icon 9.4 headers are
# rewritten in the same form. Because headers from earlier versions of
# Icon contain no room for expansion, they are rewritten in a different
# form to accommodate a possibly-longer path.
#
############################################################################
#
# Requires: Unix
#
############################################################################
procedure main(args)
local fname, path, f, header, hlength, pfx
if *args ~= 2 then
stop("usage: ", &progname, " file iconx")
fname := get(args)
path := get(args)
f := open(fname, "rwu") | stop("cannot open ", fname, " for writing")
header := reads(f, 1000) | stop(fname, ": empty file")
header ? {
(tab(find("\n[executable Icon binary follows]\n")) & tab(find("\f\n\0"))) |
stop(fname, ": not an Icon executable")
hlength := &pos - 1
tab(1)
if pfx := tab(find("IXBIN=") + 6) then {
# Icon 9.4 or later binary
tab(upto('\n'))
header := pfx || path || tab(hlength + 1)
}
else {
# Icon 9.3 or earlier binary
header := "#!/bin/sh" ||
"\n" ||
"\nexec ${ICONX-" || path || "} $0 ${1+\"$@\"}" ||
"\n\n\n\n\n" ||
"\n[executable Icon binary follows]" || # must appear exactly
"\n"
}
}
if *header + 3 > hlength then
stop("cannot patch: path is too long to fit")
if not close(open(path)) then
write(&errout, "warning: cannot open ", path, "; patching anyway")
seek(f, 1) | stop("cannot reposition ", fname)
writes(f, left(header, hlength)) | stop("write failed")
end
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