1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
<HTML>
<!--
***********************************************************************
FUNNELWEB MANUAL WEB PAGE
=========================
Copyright (c) Ross N. Williams 1992,1999. All rights reserved.
Permission is granted to redistribute and use this manual in
any medium, with or without modification, provided that all
notices (including, without limitation, the copyright
notice, this permission notice, any record of modification,
and all legal notices) are preserved on all copies, that all
modifications are clearly marked, and that modified versions
are not represented as the original version unless all the
modifications since the manual's original release by Ross N.
Williams (www.ross.net) consist of translations or other
transformations that alter only the manual's form, not its
content. THIS MANUAL IS PROVIDED "AS IS" AND WITHOUT ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND
FITNESS FOR A PARTICULAR PURPOSE. TO THE EXTENT PERMITTED BY
LAW THERE IS ABSOLUTELY NO WARRANTY.
***********************************************************************
-->
<HEAD>
<TITLE>5.13 TABs</TITLE>
<STYLE TYPE="text/css"> <!-- A {text-decoration: none} // --> </STYLE>
</HEAD>
<BODY BACKGROUND="binary/background.gif"
BGCOLOR="#FFFFFF"
TEXT="#000000"
VLINK="#660000"
LINK="#FF0000"
ALINK="#CC0000">
<TABLE WIDTH="590">
<TR>
<TD WIDTH="130" VALIGN="top">
<IMG SRC="binary/d_clear.gif" ALT="" WIDTH="130" HEIGHT="1"><BR>
<FONT SIZE="2">
<BR>
<A HREF="http://www.ross.net/"
TARGET="rosshome"
onClick="window.open('','rosshome','location,status,menubar,scrollbars,resizable',false).focus(); return true;"
>
<IMG SRC="binary/rossnet_logo.gif"
WIDTH="64" HEIGHT="32"
BORDER="0" ALT="RossNet"
HSPACE="0" VSPACE="1"></A><BR>
<BR>
<A HREF="../index.shtml"
TARGET="funnelweb"
onClick="window.open('','funnelweb','location,status,menubar,scrollbars,resizable',false).focus(); return true;"
>
<IMG SRC="binary/linklogo.gif"
WIDTH="64" HEIGHT="32"
BORDER="0" ALT="FunnelWeb"
HSPACE="0" VSPACE="1"></A><BR>
<BR>
<TABLE CELLSPACING=0 CELLPADDING=0 BORDER=0><TR><TD BGCOLOR="#000000">
<A HREF="../reference/index.html"
TARGET="funnelwebreference"
onClick="window.open('','funnelwebreference','location,status,menubar,scrollbars,resizable',false).focus(); return true;"
><FONT COLOR="#FFFFFF"><B>Reference</B></FONT></A><BR>
<BR>
<A HREF="../developer/index.html"
TARGET="funnelwebdeveloper"
onClick="window.open('','funnelwebdeveloper','location,status,menubar,scrollbars,resizable',false).focus(); return true;"
><FONT COLOR="#FFFFFF"><B>Developer</B></FONT></A><BR>
<BR>
<A HREF="index.html"><FONT COLOR="#FFFFFF"><B>Tutorial</B></FONT></A><BR>
<A HREF="intro.html"><FONT COLOR="#FFFFFF">1 Introduction</FONT></A><BR>
<A HREF="macro.html"><FONT COLOR="#FFFFFF">2 Macros</FONT></A><BR>
<A HREF="type.html"><FONT COLOR="#FFFFFF">3 Typesetting</FONT></A><BR>
<A HREF="example.html"><FONT COLOR="#FFFFFF">4 Example</FONT></A><BR>
<A HREF="hints.html"><FONT COLOR="#FFFFFF">5 Hints</FONT></A><BR>
<A HREF="examples.html"><FONT COLOR="#FFFFFF">6 Examples</FONT></A><BR>
<A HREF="web.html"><FONT COLOR="#FFFFFF">7 Webmaking</FONT></A><BR>
<BR>
<A HREF="search.html"><FONT COLOR="#FFFFFF"><B>SEARCH</B></FONT></A><BR>
</FONT>
</TD></TR></TABLE>
</TD>
<TD WIDTH="460" VALIGN="top">
<FONT SIZE="3">
<A HREF="../reference/index.html"><IMG SRC="binary/title.gif"
WIDTH="302" HEIGHT="24"
BORDER="0" ALT="FunnelWeb Tutorial Manual"
HSPACE="0" VSPACE="0"></A>
<P><FONT SIZE="5">5.13 TABs</FONT><BR>
<P>FunnelWeb is designed to protect its user from spurious
non-printable characters that might creep into a source file,
and so it classifies any occurrence of such a character as
an error.
<P>FunnelWeb's idea of printable is any character in the
range ASCII [32..126]. A number of people have complained
about this, saying that they want to include 8-bit
characters in their FunnelWeb input files. Currently there
is no fix for this except to insert characters explicitly
into the output using a <SAMP>@^</SAMP> sequence (see the
<A HREF="../reference/index.html"
TARGET="funnelwebreference"
onClick="window.open('','funnelwebreference','location,status,menubar,scrollbars,resizable',false).focus(); return true;"
>FunnelWeb Reference Manual</A> for more details).
<P>In particular, FunnelWeb flags TAB characters in its
input file as errors because TABs are essentially invisible
control characters with very poorly-defined semantics; it's
FunnelWeb's job to keep an eye on the input file to ensure
that the programmer doesn't get any nasty surprises and as
TABs can cause several kinds of surprises, they are excluded.
<P>A lot of people have complained about this aspect of
FunnelWeb. Unfortunately, this issue has not yet been
resolved. If you actually <I>need</I> TABs in the output
file (e.g. for a makefile), then you should insert TABs
explicitly using a <SAMP>@^D(009)</SAMP> sequence (see the
<A HREF="../reference/index.html"
TARGET="funnelwebreference"
onClick="window.open('','funnelwebreference','location,status,menubar,scrollbars,resizable',false).focus(); return true;"
>FunnelWeb Reference Manual</A> for more details).
<P>The following C program removes TABs. The program was
kindly donated by John Skaller. Warning: This program
doesn't have any error checking.
<PRE>
/* UNTAB Program */
/* ============= */
/* Author : John Skaller (maxtal@extro.ucc.su.oz.au) */
/* Organization : MAXTAL P/L 6 Mackay St ASHFIELD 2131. */
/* Usage : untab 2 <infile >outfile */
/* Status : Public domain. */
#include <stdio.h>
int main(int argv, char **argc)
{
int n=2;
if(argv==2)sscanf(argc[1],"%d",&n);
int ch=getchar();
int column=0;
while(ch!=-1){
if(ch=='\n'){putchar('\n'); column=0;}
else if(ch==9){
putchar(' '); column++;
while(column % n){putchar(' '); column++;}
}
else { putchar(ch); column++;}
ch=getchar();
}
}
</PRE>
<P>
<TABLE WIDTH="100%">
<TR>
<TD ALIGN="left" VALIGN="bottom"><A HREF="hints_debugging.html"><IMG SRC="binary/fw_left.gif" HEIGHT="32" WIDTH="32" BORDER="0" ALT="Prev"></A></TD>
<TD ALIGN="center" VALIGN="bottom"><A HREF="hints.html"><IMG SRC="binary/fw_up.gif" HEIGHT="32" WIDTH="32" BORDER="0" ALT="Up"></A></TD>
<TD ALIGN="right" VALIGN="bottom"><A HREF="hints_htmlstyle.html"><IMG SRC="binary/fw_right.gif" HEIGHT="32" WIDTH="32" BORDER="0" ALT="Next"></A></TD>
</TR>
</TABLE>
<HR>
<FONT SIZE="2">
<A HREF="mailto:webmaster@ross.net">Webmaster</A>
<A HREF="copyright.html">Copyright © Ross N. Williams 1992,1999. All rights reserved.</A><BR>
</FONT>
</FONT>
</TD>
</TR>
</TABLE>
</BODY>
<!-- *********************************************************************** -->
<!-- End Of A FunnelWeb Manual Web Page (www.ross.net/funnelweb/) -->
<!-- *********************************************************************** -->
</HTML>
|
