1# mkstrtable.awk
2# Copyright (C) 2003 g10 Code GmbH
3# 
4# This program is free software; you can redistribute it and/or
5# modify it under the terms of the GNU General Public License as
6# published by the Free Software Foundation; either version 2 of
7# the License, or (at your option) any later version.
8#
9# This program is distributed in the hope that it will be useful,
10# but WITHOUT ANY WARRANTY; without even the implied warranty of
11# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12# General Public License for more details.
13#
14# You should have received a copy of the GNU General Public License
15# along with this program; if not, write to the Free Software
16# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
17#
18# As a special exception, g10 Code GmbH gives unlimited permission to
19# copy, distribute and modify the C source files that are the output
20# of mkerrcodes2.awk.  You need not follow the terms of the GNU General
21# Public License when using or distributing such scripts, even though
22# portions of the text of mkerrcodes2.awk appear in them.  The GNU
23# General Public License (GPL) does govern all other use of the material
24# that constitutes the mkerrcodes2.awk program.
25#
26# Certain portions of the mkerrcodes2.awk source text are designed to be
27# copied (in certain cases, depending on the input) into the output of
28# mkerrcodes2.awk.  We call these the "data" portions.  The rest of the
29# mkerrcodes2.awk source text consists of comments plus executable code
30# that decides which of the data portions to output in any given case.
31# We call these comments and executable code the "non-data" portions.
32# mkstrtable.h never copies any of the non-data portions into its output.
33#
34# This special exception to the GPL applies to versions of mkerrcodes2.awk
35# released by g10 Code GmbH.  When you make and distribute a modified version
36# of mkerrcodes2.awk, you may extend this special exception to the GPL to
37# apply to your modified version as well, *unless* your modified version
38# has the potential to copy into its output some of the text that was the
39# non-data portion of the version that you started with.  (In other words,
40# unless your change moves or copies text from the non-data portions to the
41# data portions.)  If your modification has such potential, you must delete
42# any notice of this special exception to the GPL from your modified version.
43
44# This script outputs a source file that does define the following
45# symbols:
46#
47# static const char msgstr[];
48# A string containing all messages in the list.
49#
50# static const int msgidx[];
51# A list of index numbers, one for each message, that points to the
52# beginning of the string in msgstr.
53#
54# msgidxof (code);
55# A macro that maps code numbers to idx numbers.  If a DEFAULT MESSAGE
56# is provided (see below), its index will be returned for unknown codes.
57# Otherwise -1 is returned for codes that do not appear in the list.
58# You can lookup the message with code CODE with:
59# msgstr + msgidx[msgidxof (code)].
60#
61# The input file has the following format:
62# CODE1	MESSAGE1		(Code number, <tab>, message string)
63# CODE2	MESSAGE2		(Code number, <tab>, message string)
64# ...
65# CODEn	MESSAGEn		(Code number, <tab>, message string)
66# 	DEFAULT MESSAGE		(<tab>, fall-back message string)
67#
68# Comments (starting with # and ending at the end of the line) are removed,
69# as is trailing whitespace.  The last line is optional; if no DEFAULT
70# MESSAGE is given, msgidxof will return the number -1 for unknown
71# index numbers.
72
73BEGIN {
74# msg holds the number of messages.
75  msg = 0;
76  print "/* Output of mkerrcodes2.awk.  DO NOT EDIT.  */";
77  print "";
78  header = 1;
79}
80
81/^#/ { next; }
82
83header {
84  if ($1 ~ /^[0123456789]+$/)
85    {
86      print "static const int err_code_from_index[] = {";
87      header = 0;
88    }
89  else
90    print;
91}
92
93!header {
94  sub (/\#.+/, "");
95  sub (/[ 	]+$/, ""); # Strip trailing space and tab characters.
96
97  if (/^$/)
98    next;
99
100# Print the string msgstr line by line.  We delay output by one line to be able
101# to treat the last line differently (see END).
102  print "  " $2 ",";
103
104# Remember the error value and index of each error code.
105  code[msg] = $1;
106  pos[msg] = $2;
107  msg++;
108}
109END {
110  print "};";
111  print "";
112  print "#define errno_to_idx(code) (0 ? -1 \\";
113
114# Gather the ranges.
115  skip = code[0];
116  start = code[0];
117  stop = code[0];
118  for (i = 1; i < msg; i++)
119    {
120      if (code[i] == stop + 1)
121	stop++;
122      else
123	{
124	  print "  : ((code >= " start ") && (code <= " stop ")) ? (code - " \
125            skip ") \\";
126	  skip += code[i] - stop - 1;
127	  start = code[i];
128	  stop = code[i];
129	}
130    }
131  print "  : ((code >= " start ") && (code <= " stop ")) ? (code - " \
132    skip ") \\";
133  print "  : -1)";
134}
135