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76 lines
2.1 KiB
Groff
76 lines
2.1 KiB
Groff
.\" Copyright (c) 1988 Massachusetts Institute of Technology,
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.\" Student Information Processing Board. All rights reserved.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd November 22, 1988
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.Os
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.Dt COMPILE_ET 1
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.Sh NAME
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.Nm compile_et
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.Nd error table compiler
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.Sh SYNOPSIS
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.Nm compile_et
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.Ar file
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.Sh DESCRIPTION
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.Nm Compile_et
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converts a table listing error-code names and associated messages into
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a C source file suitable for use with the
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.Xr com_err 3
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library.
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.Pp
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The source file name must end with a suffix of ``.et''; the file
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consists of a declaration supplying the name (up to four characters
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long) of the error-code table:
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.Pp
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.Em error_table name
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.Pp
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followed by up to 256 entries of the form:
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.Pp
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.Em error_code name ,
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.No \(dq Ns Em string Ns \(dq
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.Pp
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and a final
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.Pp
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.Em end
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.Pp
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to indicate the end of the table.
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.Pp
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The name of the table is used to construct the name of a subroutine
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.Em initialize_XXXX_error_table
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which must be called in order for the
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.Xr com_err 3
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library to recognize the error table.
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.Pp
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The various error codes defined are assigned sequentially increasing
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numbers (starting with a large number computed as a hash function of
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the name of the table); thus for compatibility it is suggested that
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new codes be added only to the end of an existing table, and that no
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codes be removed from tables.
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.Pp
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The names defined in the table are placed into a C header file with
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preprocessor directives defining them as integer constants of up to
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32 bits in magnitude.
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.Pp
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A C source file is also generated which should be compiled and linked
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with the object files which reference these error codes; it contains
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the text of the messages and the initialization subroutine. Both C
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files have names derived from that of the original source file, with
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the ``.et'' suffix replaced by ``.c'' and ``.h''.
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.Pp
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A ``#'' in the source file is treated as a comment character, and all
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remaining text to the end of the source line will be ignored.
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.Sh BUGS
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Since
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.Nm compile_et
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uses a very simple parser based on
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.Xr yacc 1 ,
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its error recovery leaves much to be desired.
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.Sh SEE ALSO
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.Xr yacc 1 ,
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.Xr com_err 3
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.Rs
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.%A Ken Raeburn
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.%T "A Common Error Description Library for UNIX"
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.Re
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