.so macro
.he 'CPP68''CPP68'
.de sw
.sp
.ti -8
..
.pr PROGRAM CPP68
cpp68 - 68000 C preprocessor
.us USAGE
cpp68 [-C] [-P] [-E] [-D] [-I] [-[6|7|3|5]] source
.fn FUNCTION
'cpp68' is the REGULUS 68000 C preprocessor.  It may be called specifically
or by using 'cc'.  The following flags re interpreted by the C preprocessor:
.sp
.sw
-P\ \ \ \ \ \ Run only the macro preprocessor
on the named C programs, and leave the output on corresponding
files suffixed '.i'.
.sw
-E\ \ \ \ \ \ Run only the macro preprocessor on the named C programs,
and write the output to the standard output device.  Each code block is
identified using a sequence consisting of the source file name and
line number (eg. # 34 file.c).
.sw
-C\ \ \ \ \ \ Like the -C flag except that the comments are not removed.
This is used by lint and similar programs which need information which
is stored in comments.
.sw
-Idir\ \ \ Specify a directory (eg. -I/usr/include/test) in which to 
search for include files which are surrounded by angle brackets <stdio.h> 
or quotes "ctypes.h" before searching in the default directory '/usr/include'.
If '-I' is specified without a directory name the current directory will 
be used.
.sw
-6\ \ \ \ \ \ Version 6 compatibility mode.  Adds the v6 include file
directory onto the include file search list (/usr/include/v6), and
adds the version 6 compatibility library (/lib/libv6.a) to the
loader's library search list.
.sw
-7\ \ \ \ \ \ Version 7 compatibility mode.  Adds the v7 include file
directory onto the include file search list (/usr/include/v7), and
adds the version 7 compatibility library (/lib/libv7.a) to the
loader's library search list.
.sw
-3\ \ \ \ \ \ System 3 compatibility mode.  Adds the s3 include file
directory onto the include file search list (/usr/include/sys3), and
adds the system 3 compatibility library (/lib/libs3.a) to the
loader's library search list.
.sw
-5\ \ \ \ \ \ System 5 compatibility mode.  Adds the s5 include file
directory onto the include file search list (/usr/include/sys5), and
adds the system 5 compatibility library (/lib/libs5.a) to the
loader's library search list.
.in -8
.sp
.ne 4
'cpp68' provides a macro processing facility with the following commands:
.sp
.in +8
.ti -8
#include "filename"
.br
.ti -8
#include <filename>
.sp
Causes the text of the named file to be inserted in the input stream.
Files may contain (nested) #include statements.  The quoted (single or
double) inlude file will first be looked for in the directory where the 
source file exists which references it, followed by the directories
specified using the '-I' flag, and finally in the directory '/usr/include'.
An include file surrounded by angle brackets will be looked for only on
the include file path list, and in '/usr/include'.
.sp
.ti -8
#define NAME string
.sp
Causes the contents of "string" to be substituted
for NAME whenever NAME is encountered in the input stream.
NAME must be a valid "C" identifier.
.sp
.ti -8
#define NAME(a,b,c) text
.sp
Causes substitution of the text (with
parameters) whenever
NAME(p1,p2,p3) is encountered in the input stream.
NAME, a, b, and c must be valid "C" identifiers.
.sp
.ti -8
#undef NAME
.sp
Causes the definition of NAME to be forgotten.
.sp
.ti -8
#ifdef NAME
.sp
If NAME has been previously defined in a #define statement
or via the -D flag,
include all input until a corresponding #else or #endif is encountered;
if NAME is undefined, skip the input.
Nesting of conditional statements is permitted.
The value of NAME is immaterial.
.sp
.ti -8
#ifndef NAME
.sp
If NAME has not been defined in a previous #define statement,
include all input until a corresponding #else or #endif
is encountered in the input
stream; if NAME is defined, skip the input.
.sp
.ti -8
#if CONSTANT_EXPRESSION
.sp
If the CONSTANT_EXPRESSION has a non-zero value, include
all input until a corresponding #endif or #else is encountered in the
input stream; if CONSTANT_EXPRESSION is zero, skip the input.
.sp
.ti -8
#else
.sp
If the checked condition in the corresponding #if, #ifdef, or
#ifndef is true then any lines between #else and #endif are ignored.
If the checked condition is false then any lines between the test
and the #else or, lacking a #else, the #endif, are ignored.
.sp
.ti -8
#endif
.sp
Terminate a #if or #ifdef or #ifndef statement.
.sp
.ti -8
#line LINE [FILENAME]
.sp
Coerces the preprocessor and the parser into believing that the next line
is in the specified file on the specified line.  If no filename is
specified uses the current source file name.
.in -8
.sp
There are two predefined, user redefineable macro's __FILE and __LINE
while will respectively be evaluated to the current file name enclosed
in double quotes and line number respectively by the preprocessor.
.sp
.fl FILES
.nf
.na
file.c        input file
file.s        assembly language input file
file.i        preprocessor output file
.fi
.ad
.sa SEE ALSO
.fi
.ad
c68(cmnd)