1 .\" Copyright (c) 1988 Massachusetts Institute of Technology,
2 .\" Student Information Processing Board. All rights reserved.
4 .\" $FreeBSD: src/contrib/com_err/compile_et.1,v 1.1.2.2 2001/03/05 11:27:28 asmodai Exp $
5 .\" $DragonFly: src/contrib/com_err/compile_et.1,v 1.2 2003/06/17 04:23:58 dillon Exp $
12 .Nd error table compiler
18 converts a table listing error-code names and associated messages into
19 a C source file suitable for use with the
23 The source file name must end with a suffix of ``.et''; the file
24 consists of a declaration supplying the name (up to four characters
25 long) of the error-code table:
29 followed by up to 256 entries of the form:
32 .No \(dq Ns Em string Ns \(dq
38 to indicate the end of the table.
40 The name of the table is used to construct the name of a subroutine
41 .Em initialize_XXXX_error_table
42 which must be called in order for the
44 library to recognize the error table.
46 The various error codes defined are assigned sequentially increasing
47 numbers (starting with a large number computed as a hash function of
48 the name of the table); thus for compatibility it is suggested that
49 new codes be added only to the end of an existing table, and that no
50 codes be removed from tables.
52 The names defined in the table are placed into a C header file with
53 preprocessor directives defining them as integer constants of up to
56 A C source file is also generated which should be compiled and linked
57 with the object files which reference these error codes; it contains
58 the text of the messages and the initialization subroutine. Both C
59 files have names derived from that of the original source file, with
60 the ``.et'' suffix replaced by ``.c'' and ``.h''.
62 A ``#'' in the source file is treated as a comment character, and all
63 remaining text to the end of the source line will be ignored.
67 uses a very simple parser based on
69 its error recovery leaves much to be desired.
75 .%T "A Common Error Description Library for UNIX"