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<TITLE>3.3 Coding Style</TITLE>
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<A HREF="index.html"><FONT COLOR="#FFFFFF"><B>Developer</B></FONT></A><BR>
<A HREF="compile.html"><FONT COLOR="#FFFFFF">1 Compile</FONT></A><BR>
<A HREF="design.html"><FONT COLOR="#FFFFFF">2 Design</FONT></A><BR>
<A HREF="implement.html"><FONT COLOR="#FFFFFF">3 Implement</FONT></A><BR>
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<P><FONT SIZE="5">3.3 Coding Style</FONT><BR>
<P>Although FunnelWeb wasn't coded under any formal C
coding standard, it was coded in accordance with a fairly
strict personal style of C which developed during the
development of FunnelWeb. This section aims to describe some
of the more important elements of the coding style.
<P><B>Portability:</B> This was a major
goal of the FunnelWeb implementation. Two excellent books
guided this move to portability. They were
<STRONG>[Rabinowitz90]</STRONG> (which deals with C code itself)
and <STRONG>[Horton90]</STRONG> (which deals with the portability
of various library calls). Other works such as
<STRONG>[Kernighan88]</STRONG> and <STRONG>[ANSI]</STRONG> were also
helpful.
<P><B>Identifiers:</B>
<STRONG>[Rabinowitz90]</STRONG>
specifies that for wide portability, identifiers of block
and file scope should be unique to eight characters, and
identifiers of program scope should be unique to six
characters. I have gone further in FunnelWeb and actually
made these restrictions actual limits on identifier length.
<P>Because names must be so short, a system of
abbreviations was developed to organize the identifiers used
within FunnelWeb. Each abbreviation consists of a letter
pair. Here are most of the abbreviations
used:
<P>
<PRE>
bp - Body Part.
cm - Compare. Used to prefix comparison
routines that return [-1,0,1].
dc - Document component.
dm - Dump package.
el - Element.
eq - Equal. Used to prefix comparison
routines that return a boolean.
ex - Expression.
f - Global files.
ll - List of lists.
ln - Line record.
ls - List Package.
lr - Lister package.
ma - Macro.
mc - Macro Call.
mn - Macro Name.
op - Options package.
pr - Parser.
ps - Position record.
sc - Scrap record.
sn - Section.
tb - Table package.
ty - Typesetter directive.
wf - Write file package.
wl - Write with EOL (misc.c).
wr - Write (misc.c).
</PRE>
<P><B>Pointers:</B> Variables or types denoting
pointers start with "<TT>p_</TT>".
<P><B>Types:</B> Names denoting types end in
"<TT>_t</TT>". Thus, a type for a pointer to a table would
be named <SAMP>p_tb_t</SAMP>.
<P><B>File names:</B> All FunnelWeb source
files have file
names that are from one to eight characters long and file
extensions that are from one to three characters long. This
ensures that the FunnelWeb source code can be portably moved
to all kinds of machines, including MSDOS!
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