# mkstrtable.awk

# Copyright (C) 2003 g10 Code GmbH

# 

# This program is free software; you can redistribute it and/or

# modify it under the terms of the GNU General Public License as

# published by the Free Software Foundation; either version 2 of

# the License, or (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

#

# As a special exception, g10 Code GmbH gives unlimited permission to

# copy, distribute and modify the C source files that are the output

# of mkerrcodes2.awk.  You need not follow the terms of the GNU General

# Public License when using or distributing such scripts, even though

# portions of the text of mkerrcodes2.awk appear in them.  The GNU

# General Public License (GPL) does govern all other use of the material

# that constitutes the mkerrcodes2.awk program.

#

# Certain portions of the mkerrcodes2.awk source text are designed to be

# copied (in certain cases, depending on the input) into the output of

# mkerrcodes2.awk.  We call these the "data" portions.  The rest of the

# mkerrcodes2.awk source text consists of comments plus executable code

# that decides which of the data portions to output in any given case.

# We call these comments and executable code the "non-data" portions.

# mkstrtable.h never copies any of the non-data portions into its output.

#

# This special exception to the GPL applies to versions of mkerrcodes2.awk

# released by g10 Code GmbH.  When you make and distribute a modified version

# of mkerrcodes2.awk, you may extend this special exception to the GPL to

# apply to your modified version as well, *unless* your modified version

# has the potential to copy into its output some of the text that was the

# non-data portion of the version that you started with.  (In other words,

# unless your change moves or copies text from the non-data portions to the

# data portions.)  If your modification has such potential, you must delete

# any notice of this special exception to the GPL from your modified version.

# This script outputs a source file that does define the following

# symbols:

#

# static const char msgstr[];

# A string containing all messages in the list.

#

# static const int msgidx[];

# A list of index numbers, one for each message, that points to the

# beginning of the string in msgstr.

#

# msgidxof (code);

# A macro that maps code numbers to idx numbers.  If a DEFAULT MESSAGE

# is provided (see below), its index will be returned for unknown codes.

# Otherwise -1 is returned for codes that do not appear in the list.

# You can lookup the message with code CODE with:

# msgstr + msgidx[msgidxof (code)].

#

# The input file has the following format:

# CODE1	MESSAGE1		(Code number, <tab>, message string)

# CODE2	MESSAGE2		(Code number, <tab>, message string)

# ...

# CODEn	MESSAGEn		(Code number, <tab>, message string)

# 	DEFAULT MESSAGE		(<tab>, fall-back message string)

#

# Comments (starting with # and ending at the end of the line) are removed,

# as is trailing whitespace.  The last line is optional; if no DEFAULT

# MESSAGE is given, msgidxof will return the number -1 for unknown

# index numbers.

BEGIN {

# msg holds the number of messages.

  msg = 0;

  print "/* Output of mkerrcodes2.awk.  DO NOT EDIT.  */";

  print "";

  header = 1;

}

/^#/ { next; }

header {

  if ($1 ~ /^[0123456789]+$/)

    {

      print "static const int err_code_from_index[] = {";

      header = 0;

    }

  else

    print;

}

!header {

  sub (/\#.+/, "");

  sub (/[ 	]+$/, ""); # Strip trailing space and tab characters.

  if (/^$/)

    next;

# Print the string msgstr line by line.  We delay output by one line to be able

# to treat the last line differently (see END).

  print "  " $2 ",";

# Remember the error value and index of each error code.

  code[msg] = $1;

  pos[msg] = $2;

  msg++;

}

END {

  print "};";

  print "";

  print "#define errno_to_idx(code) (0 ? -1 \\";

# Gather the ranges.

  skip = code[0];

  start = code[0];

  stop = code[0];

  for (i = 1; i < msg; i++)

    {

      if (code[i] == stop + 1)

	stop++;

      else

	{

	  print "  : ((code >= " start ") && (code <= " stop ")) ? (code - " \

            skip ") \\";

	  skip += code[i] - stop - 1;

	  start = code[i];

	  stop = code[i];

	}

    }

  print "  : ((code >= " start ") && (code <= " stop ")) ? (code - " \

    skip ") \\";

  print "  : -1)";

}