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The C Users' Group Library 1994 August
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243_01
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cpp1.c
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/*
** name: cpp1.c
*/
/*
* CPP main program.
*
* Edit history
* 21-May-84 MM "Field test" release
* 23-May-84 MM Some minor hacks.
* 30-May-84 ARF Didn't get enough memory for __DATE__
* Added code to read stdin if no input
* files are provided.
* 29-Jun-84 MM Added ARF's suggestions, Unixifying cpp.
* 11-Jul-84 MM "Official" first release (that's what I thought!)
* 22-Jul-84 MM/ARF/SCK Fixed line number bugs, added cpp recognition
* of #line, fixed problems with #include.
* 23-Jul-84 MM More (minor) include hacking, some documentation.
* Also, redid cpp's #include files
* 25-Jul-84 MM #line filename isn't used for #include searchlist
* #line format is <number> <optional name>
* 25-Jul-84 ARF/MM Various bugs, mostly serious. Removed homemade doprint
* 01-Aug-84 MM Fixed recursion bug, remove extra newlines and
* leading whitespace from cpp output.
* 02-Aug-84 MM Hacked (i.e. optimized) out blank lines and unneeded
* whitespace in general. Cleaned up unget()'s.
* 03-Aug-84 Keie Several bug fixes from Ed Keizer, Vrije Universitet.
* -- corrected arg. count in -D and pre-defined
* macros. Also, allow \n inside macro actual parameter
* lists.
* 06-Aug-84 MM If debugging, dump the preset vector at startup.
* 12-Aug-84 MM/SCK Some small changes from Sam Kendall
* 15-Aug-84 Keie/MM cerror, cwarn, etc. take a single string arg.
* cierror, etc. take a single int. arg.
* changed LINE_PREFIX slightly so it can be
* changed in the makefile.
* 31-Aug-84 MM USENET net.sources release.
* 7-Sep-84 SCH/ado Lint complaints
* 10-Sep-84 Keie Char's can't be signed in some implementations
* 11-Sep-84 ado Added -C flag, pathological line number fix
* 13-Sep-84 ado Added -E flag (does nothing) and "-" file for stdin.
* 14-Sep-84 MM Allow # 123 as a synonym for #line 123
* 19-Sep-84 MM scanid always reads to token, make sure #line is
* written to a new line, even if -C switch given.
* Also, cpp - - reads stdin, writes stdout.
* 03-Oct-84 ado/MM Several changes to line counting and keepcomments
* stuff. Also a rewritten control() hasher -- much
* simpler and no less "perfect". Note also changes
* in cpp3.c to fix numeric scanning.
* 04-Oct-84 MM Added recognition of macro formal parameters if
* they are the only thing in a string, per the
* draft standard.
* 08-Oct-84 MM One more attack on scannumber
* 15-Oct-84 MM/ado Added -N to disable predefined symbols. Fixed
* linecount if COMMENT_INVISIBLE enabled.
* 22-Oct-84 MM Don't evaluate the #if/#ifdef argument if
* compilation is supressed. This prevents
* unnecessary error messages in sequences such as
* #ifdef FOO -- undefined
* #if FOO == 10 -- shouldn't print warning
* 25-Oct-84 MM Fixed bug in false ifdef supression. On vms,
* #include <foo> should open foo.h -- this duplicates
* the behavior of Vax-C
* 31-Oct-84 ado/MM Parametized $ in indentifiers. Added a better
* token concatenator and took out the trial
* concatenation code. Also improved #ifdef code
* and cleaned up the macro recursion tester.
* 2-Nov-84 MM/ado Some bug fixes in token concatenation, also
* a variety of minor (uninteresting) hacks.
* 6-Nov-84 MM Happy Birthday. Broke into 4 files and added
* #if sizeof (basic_types)
* 9-Nov-84 MM Added -S* for pointer type sizes
* 13-Nov-84 MM Split cpp1.c, added vms defaulting
* 23-Nov-84 MM/ado -E supresses error exit, added CPP_INCLUDE,
* fixed strncpy bug.
* 3-Dec-84 ado/MM Added OLD_PREPROCESSOR
* 7-Dec-84 MM Stuff in Nov 12 Draft Standard
* 17-Dec-84 george Fixed problems with recursive macros
* 17-Dec-84 MM Yet another attack on #if's (f/t)level removed.
* 07-Jan-85 ado Init defines before doing command line options
* so -Uunix works.
* 14-Jan-85 MM Fixed bug with logical device translation on VMS.
* 18-Jan-85 MM Rearrainged fgetname() conditionals.
* 27-Mar-85 ado Fix bug in pcc
* 28-Mar-85 MM Another attack on concatenation and some minor
* cleanup and typo corrections.
* 29-Mar-85 ado/MM trigraphs, also fixed bug with / at end of macro.
* 11-Apr-85 ado Buglets (typos and lint picking)
* 29-Apr-85 MM Added concat without reexpansion. Suggestion from ado.
* 07-Jun-85 KR added -P option. don't output #line
*/
/*)BUILD
$(PROGRAM) = cpp
$(FILES) = { cpp1 cpp2 cpp3 cpp4 cpp5 cpp6 }
$(INCLUDE) = { cppdef.h cpp.h }
$(STACK) = 3000
$(TKBOPTIONS) = {
STACK = 2000
}
*/
#ifdef DOCUMENTATION
title cpp C Pre-Processor
index C pre-processor
synopsis
.s.nf
cpp [-options] [infile [outfile]]
.s.f
description
CPP reads a C source file, expands macros and include
files, and writes an input file for the C compiler.
If no file arguments are given, CPP reads from stdin
and writes to stdout. If one file argument is given,
it will define the input file, while two file arguments
define both input and output files. The file name "-"
is a synonym for stdin or stdout as appropriate.
The following options are supported. Options may
be given in either case.
.lm +16
.p -16
-C If set, source-file comments are written
to the output file. This allows the output of CPP to be
used as the input to a program, such as lint, that expects
commands embedded in specially-formatted comments.
.p -16
-Dname=value Define the name as if the programmer wrote
#define name value
at the start of the first file. If "=value" is not
given, a value of "1" will be used.
On non-unix systems, all alphabetic text will be forced
to upper-case.
.p -16
-E Always return "success" to the operating
system, even if errors were detected. Note that some fatal
errors, such as a missing #include file, will terminate
CPP, returning "failure" even if the -E option is given.
.p -16
-Idirectory Add this directory to the list of
directories searched for #include "..." and #include <...>
commands. Note that there is no space between the
"-I" and the directory string. More than one -I command
is permitted. On non-Unix systems "directory" is forced
to upper-case.
.p -16
-N CPP normally predefines some symbols defining
the target computer and operating system. If -N is specified,
no symbols will be predefined. If -N -N is specified, the
"always present" symbols, __LINE__, __FILE__, and __DATE__
are not defined.
.p -16
-P CPP normally writes lines of the form
#line <number> <file.name> to the output file so the compiler
can print the line number and name of the original source file
for diagnostic messages. The -P option will suppress this output.
.p -16
-Stext CPP normally assumes that the size of
the target computer's basic variable types is the same as the size
of these types of the host computer. (This can be overridden
when CPP is compiled, however.) The -S option allows dynamic
respecification of these values. "text" is a string of
numbers, separated by commas, that specifies correct sizes.
The sizes must be specified in the exact order:
char short int long float double
If you specify the option as "-S*text", pointers to these
types will be specified. -S* takes one additional argument
for pointer to function (e.g. int (*)())
For example, to specify sizes appropriate for a PDP-11,
you would write:
c s i l f d func
-S1,2,2,2,4,8,
-S*2,2,2,2,2,2,2
Note that all values must be specified.
.p -16
-Tnumber Enable (number = 1) or disable
trigraph recognition. (If no number is given, the
default state is reversed.) If enabled, the sequence
"??" is a character-escape to allow certain characters
to be entered on systems where the normal representation
is used for national letters. This implementation
"merely" converts the trigraph to the internal representation,
and thus is probably incorrect. A correct implementation
would seem to require recognition of Ansi escape sequences
in the input stream. Someone else can write that routine.
.p -16
-Uname Undefine the name as if
#undef name
were given. On non-Unix systems, "name" will be forced to
upper-case.
.p -16
-Xnumber Enable debugging code. If no value is
given, a value of 1 will be used. (For maintenence of
CPP only.)
.s.lm -16
Pre-Defined Variables
When CPP begins processing, the following variables will
have been defined (unless the -N option is specified):
.s
Target computer (as appropriate):
.s
pdp11, vax, M68000 m68000 m68k
.s
Target operating system (as appropriate):
.s
rsx, rt11, vms, unix
.s
Target compiler (as appropriate):
.s
decus, vax11c
.s
The implementor may add definitions to this list.
The default definitions match the definition of the
host computer, operating system, and C compiler.
.s
The following are always available unless undefined (or
-N was specified twice):
.lm +16
.p -12
__FILE__ The input (or #include) file being compiled
(as a quoted string).
.p -12
__LINE__ The line number being compiled.
.p -12
__DATE__ The date and time of compilation as
a Unix ctime quoted string (the trailing newline is removed).
Thus,
.s
printf("Bug at line %s,", __LINE__);
printf(" source file %s", __FILE__);
printf(" compiled on %s", __DATE__);
.s.lm -16
Draft Proposed Ansi Standard Considerations
The current version of the Draft Proposed Standard
explicitly states that "readers are requested not to specify
or claim conformance to this draft." Readers and users
of Decus CPP should not assume that Decus CPP conforms
to the standard, or that it will conform to the actual
C Language Standard.
When CPP is itself compiled, many features of the Draft
Proposed Standard that are incompatible with existing
preprocessors may be disabled. See the comments in CPP's
source for details.
The latest version of the Draft Proposed Standard (as reflected
in Decus CPP) is dated November 12, 1984. A few things from
later drafts are included.
Comments are removed from the input text. The comment
is replaced by a single space character. The -C option
preserves comments, writing them to the output file.
The '$' character is considered to be a letter. This is
a permitted extension.
The following new features of C are processed by CPP:
.s.comment Note: significant spaces, not tabs, .br quotes #if, #elif
.br;####_#elif expression (_#else _#if)
.br;####'_\xNNN' (Hexadecimal constant)
.br;####'_\a' (Ascii BELL)
.br;####'_\v' (Ascii Vertical Tab)
.br;####_#if defined NAME 1 if defined, 0 if not
.br;####_#if defined (NAME) 1 if defined, 0 if not
.br;####_#if sizeof (basic type)
.br;####unary +
.br;####123U, 123LU Unsigned ints and longs.
.br;####12.3L Long double numbers
.br;####_#token Stringize token
.br;####token_#_#token Token concatenation
.br;####_#include token Expands to filename
The proposed national replacement letter fallbacks, using
"??", have not been implemented.
The Draft Proposed Standard has extended C, adding a constant
string concatenation operator, where
"foo" "bar"
is regarded as the single string "foobar". (This does not
affect CPP's processing but does permit a limited form of
macro argument substitution into strings as will be discussed.)
The Standard Committee plans to add token concatenation
to #define command lines. One suggested implementation
is as follows: the sequence "Token1##Token2" is treated
as if the programmer wrote "Token1Token2". This could
be used as follows:
#line 123
#define ATLINE foo##__LINE__
ATLINE would be defined as foo123.
Note that "Token2" must either have the format of an
identifier or be a string of digits. Thus, the string
#define ATLINE foo##1x3
generates two tokens: "foo1" and "x3".
If the tokens T1 and T2 are concatenated into T3,
this implementation operates as follows:
1. Expand T1 if it is a macro.
2. Expand T2 if it is a macro.
3. Join the tokens, forming T3.
4. Output T3 (without reexpansion).
As implemented here, ## left-associates. I.e., a##b##c
is effectively (a##b)##c. Cpp can be compiled so as
to re-expand the constructed macro.
A macro formal parameter will be substituted into a string
or character constant if it is preceded by a single #.
#define VECSIZE 123
#define vprint(name, size) \
printf("name" "[" #size "] = {\n")
... vprint(vector, VECSIZE);
expands (effectively) to
vprint("vector[123] = {\n");
Note that this will be useful if your C compiler supports
the new string concatenation operation noted above.
error messages
Many. CPP prints warning or error messages if you try to
use multiple-byte character constants (non-transportable)
if you #undef a symbol that was not defined, or if your
program has potentially nested comments.
author
Martin Minow
bugs
The #if expression processor uses signed integers only.
I.e, #if 0xFFFFu < 0 may be TRUE.
A / at the end of a macro expansion will not introduce
a comment:
#define foo /
foo* this is not a comment */
#endif
#include "cppdef.h"
#include "cpp.h"
FILE_LOCAL void cppmain();
FILE_LOCAL void sharp();
/*
* Commonly used global variables:
* line is the current input line number.
* wrongline is set in many places when the actual output
* line is out of sync with the numbering, e.g,
* when expanding a macro with an embedded newline.
*
* token holds the last identifier scanned (which might
* be a candidate for macro expansion).
* errors is the running cpp error counter.
* infile is the head of a linked list of input files (extended by
* #include and macros being expanded). infile always points
* to the current file/macro. infile->parent to the includer,
* etc. infile->fd is NULL if this input stream is a macro.
*/
int line; /* Current line number */
int wrongline; /* Force #line to compiler */
char token[IDMAX + 1]; /* Current input token */
int errors; /* cpp error counter */
FILEINFO *infile = NULL; /* Current input file */
#if DEBUG
int debug; /* TRUE if debugging now */
#endif
/*
* This counter is incremented when a macro expansion is initiated.
* If it exceeds a built-in value, the expansion stops -- this tests
* for a runaway condition:
* #define X Y
* #define Y X
* X
* This can be disabled by falsifying rec_recover. (Nothing does this
* currently: it is a hook for an eventual invocation flag.)
*/
int recursion; /* Infinite recursion counter */
int rec_recover = TRUE; /* Unwind recursive macros */
/*
* instring is set TRUE when a string is scanned. It modifies the
* behavior of the "get next character" routine, causing all characters
* to be passed to the caller (except <DEF_MAGIC>). Note especially that
* comments and \<newline> are not removed from the source. (This
* prevents cpp output lines from being arbitrarily long).
*
* inmacro is set by #define -- it absorbs comments and converts
* form-feed and vertical-tab to space, but returns \<newline>
* to the caller. Strictly speaking, this is a bug as \<newline>
* shouldn't delimit tokens, but we'll worry about that some other
* time -- it is more important to prevent infinitly long output lines.
*
* instring and inmacro are parameters to the get() routine which
* were made global for speed.
*/
int instring = FALSE; /* TRUE if scanning string */
int inmacro = FALSE; /* TRUE if #defining a macro */
/*
* work[] and workp are used to store one piece of text in a temporary
* buffer. To initialize storage, set workp = work. To store one
* character, call save(c); (This will fatally exit if there isn't
* room.) To terminate the string, call save(EOS). Note that
* the work buffer is used by several subroutines -- be sure your
* data won't be overwritten. The extra byte in the allocation is
* needed for string formal replacement.
*/
char work[NWORK + 1]; /* Work buffer */
char *workp; /* Work buffer pointer */
/*
* keepcomments is set TRUE by the -C option. If TRUE, comments
* are written directly to the output stream. This is needed if
* the output from cpp is to be passed to lint (which uses commands
* embedded in comments). cflag contains the permanent state of the
* -C flag. keepcomments is always falsified when processing #control
* commands and when compilation is supressed by a false #if
*
* If eflag is set, CPP returns "success" even if non-fatal errors
* were detected.
*
* If nflag is non-zero, no symbols are predefined except __LINE__.
* __FILE__, and __DATE__. If nflag > 1, absolutely no symbols
* are predefined.
*/
int keepcomments = FALSE; /* Write out comments flag */
int cflag = FALSE; /* -C option (keep comments) */
int eflag = FALSE; /* -E option (never fail) */
int nflag = 0; /* -N option (no predefines) */
int pflag = FALSE; /* -P option (no #line output) */
int tflag = TFLAG_INIT; /* -T option (trigraphs) */
/*
* ifstack[] holds information about nested #if's. It is always
* accessed via *ifptr. The information is as follows:
* WAS_COMPILING state of compiling flag at outer level.
* ELSE_SEEN set TRUE when #else seen to prevent 2nd #else.
* TRUE_SEEN set TRUE when #if or #elif succeeds
* ifstack[0] holds the compiling flag. It is WAS_COMPILING if
* compilation is currently enabled. Note that this must be
* initialized to WAS_COMPILING.
*/
char ifstack[BLK_NEST] = { WAS_COMPILING };
char *ifptr = ifstack; /* -> current ifstack[] */
/*
* incdir[] stores the -i directories (and the system-specific
* #include <...> directories.
*/
char *incdir[NINCLUDE]; /* -i directories */
char **incend = incdir; /* -> free space in incdir[] */
/*
* This is the table used to predefine target machine and operating
* system designators. It may need hacking for specific circumstances.
* Note: it is not clear that this is part of the Ansi Standard.
* The -N option supresses preset definitions.
*/
char *preset[] = { /* names defined at cpp start */
#ifdef MACHINE
MACHINE,
#endif
#ifdef SYSTEM
SYSTEM,
#endif
#ifdef COMPILER
COMPILER,
#endif
#if DEBUG
"decus_cpp", /* Ourselves! */
#endif
NULL /* Must be last */
};
/*
* The value of these predefined symbols must be recomputed whenever
* they are evaluated. The order must not be changed.
*/
char *magic[] = { /* Note: order is important */
"__LINE__",
"__FILE__",
NULL /* Must be last */
};
/*
* This variable is used to determine the memory model for MS-DOS.
* See cppdef.h for more information.
*/
#if HOST == SYS_MSDOS
#ifdef M_I86SM
char ms_dos_model = 's';
#else
#ifdef M_I86MM
char ms_dos_model = 'm';
#else
#ifdef M_I86LM
char ms_dos_model = 'l';
#else
#ifdef I8086S
char ms_dos_model = 's';
#else
#ifdef I8086P
char ms_dos_model = 'p';
#else
#ifdef I8086D
char ms_dos_model = 'd';
#else
#ifdef I8086L
char ms_dos_model = 'l';
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
main(argc, argv)
int argc;
char *argv[];
{
register int i;
#if HOST == SYS_VMS
argc = getredirection(argc, argv); /* vms >file and <file */
#endif
initdefines(); /* O.S. specific def's */
i = dooptions(argc, argv); /* Command line -flags */
#if HOST == SYS_MSDOS
/* Undefine inappropriate memory-model
* predefines, based on either the default memory
* model (see ms_dos_model) or the user-supplied
* memory model provided by the '-M' switch in
* dooptions() (in cpp3.c).
*/
switch( ms_dos_model )
{
case 's' : /* Small Model, Small data, small pointers... */
case 'p' : /* Large Code, Small Data, small pointers... */
/* Delete invalid MSC predefinitions... */
defendel( "M_I86MM", TRUE );
defendel( "M_I86LM", TRUE );
/* And invalid Lattice predefinitions */
defendel( "LPTR", TRUE );
defendel( "I8086D", TRUE );
defendel( "I8086L", TRUE );
if ( ms_dos_model == 's' )
defendel( "I8086P", TRUE );
else {
defendel( "I8086S", TRUE );
defendel( "M_I86SM", TRUE );
} /* End if */
break;
case 'd' : /* Small Code, Large Data, large pointers... */
case 'l' : /* Large Code, Large Data, large pointers... */
/* Delete invalid MSC predefinitions */
defendel( "M_I86MM", TRUE );
defendel( "M_I86SM", TRUE );
/* And invalid Lattice predefinitions */
defendel( "SPTR", TRUE );
defendel( "I8086S", TRUE );
defendel( "I8086P", TRUE );
if ( ms_dos_model == 'd' )
{
defendel( "I8086L", TRUE );
defendel( "M_I86LM", TRUE );
} else
defendel( "I8086D", TRUE );
break;
case 'm' : /* Large code, small data, mixed pointers... */
/* Delete invalid MSC predefinitions */
defendel( "M_I86SM", TRUE );
defendel( "M_I86LM", TRUE );
/* And invalid Lattice predefinitions */
defendel( "LPTR", TRUE );
defendel( "SPTR", TRUE );
defendel( "I8086D", TRUE );
defendel( "I8086L", TRUE );
defendel( "I8086P", TRUE );
defendel( "I8086S", TRUE );
break;
} /* End switch */
#endif
switch (i) {
case 3:
/*
* Get output file, "-" means use stdout.
*/
if (!streq(argv[2], "-")) {
#if HOST == SYS_VMS
/*
* On vms, reopen stdout with "vanilla rms" attributes.
*/
if ((i = creat(argv[2], 0, "rat=cr", "rfm=var")) == -1
|| dup2(i, fileno(stdout)) == -1) {
#else
if (freopen(argv[2], "w", stdout) == NULL) {
#endif
perror(argv[2]);
cerror("Can't open output file \"%s\"", argv[2]);
exit(IO_ERROR);
}
} /* Continue by opening input */
case 2: /* One file -> stdin */
/*
* Open input file, "-" means use stdin.
*/
if (!streq(argv[1], "-")) {
if (freopen(argv[1], "r", stdin) == NULL) {
perror(argv[1]);
cerror("Can't open input file \"%s\"", argv[1]);
exit(IO_ERROR);
}
strcpy(work, argv[1]); /* Remember input filename */
break;
} /* Else, just get stdin */
case 0: /* No args? */
case 1: /* No files, stdin -> stdout */
#if HOST == SYS_VMS || HOST == SYS_RSX || HOST == SYS_RT11
fgetname(stdin, work); /* Vax-11C, Decus C know name */
#else
work[0] = EOS; /* Unix can't find stdin name */
#endif
break;
default:
exit(IO_ERROR); /* Can't happen */
}
setincdirs(); /* Setup -I include directories */
addfile(stdin, work); /* "open" main input file */
#if DEBUG
if (debug > 0)
dumpdef("preset #define symbols");
#endif
cppmain(); /* Process main file */
if ((i = (ifptr - &ifstack[0])) != 0) {
#if OLD_PREPROCESSOR
ciwarn("Inside #ifdef block at end of input, depth = %d", i);
#else
cierror("Inside #ifdef block at end of input, depth = %d", i);
#endif
}
fclose(stdout);
if (errors > 0) {
fprintf(stderr, (errors == 1)
? "%d error in preprocessor\n"
: "%d errors in preprocessor\n", errors);
if (!eflag)
exit(IO_ERROR);
}
return(IO_SUCCESS);
exit(IO_SUCCESS); /* No errors or -E option set */
}
FILE_LOCAL
void
cppmain()
/*
* Main process for cpp -- copies tokens from the current input
* stream (main file, include file, or a macro) to the output
* file.
*/
{
register int c; /* Current character */
register int counter; /* newlines and spaces */
/*
* Explicitly output a #line at the start of cpp output so
* that lint (etc.) knows the name of the original source
* file. If we don't do this explicitly, we may get
* the name of the first #include file instead.
*
* The extra putchar() and sharp() works around a bug in pcc.
*/
sharp();
putchar('\n');
sharp();
/*
* This loop is started "from the top" at the beginning of each line
* wrongline is set TRUE in many places if it is necessary to write
* a #line record. (But we don't write them when expanding macros.)
*
* The counter variable has two different uses: at
* the start of a line, it counts the number of blank lines that
* have been skipped over. These are then either output via
* #line records or by outputting explicit blank lines.
* When expanding tokens within a line, the counter remembers
* whether a blank/tab has been output. These are dropped
* at the end of the line, and replaced by a single blank
* within lines.
*/
for (;;) {
counter = 0; /* Count empty lines */
for (;;) { /* For each line, ... */
while (type[(c = get())] == SPA) /* Skip leading blanks */
; /* in this line. */
if (c == '\n') /* If line's all blank, */
++counter; /* Do nothing now */
else if (c == '#') { /* Is 1st non-space '#' */
keepcomments = FALSE; /* Don't pass comments */
counter = control(counter); /* Yes, do a #command */
keepcomments = (cflag && compiling);
}
else if (c == EOF_CHAR) /* At end of file? */
break;
else if (!compiling) { /* #ifdef false? */
skipnl(); /* Skip to newline */
counter++; /* Count it, too. */
}
else {
break; /* Actual token */
}
}
if (c == EOF_CHAR) /* Exit process at */
break; /* End of file */
/*
* If the loop didn't terminate because of end of file, we
* know there is a token to compile. First, clean up after
* absorbing newlines. counter has the number we skipped.
*/
if ((wrongline && infile->fp != NULL) || counter > 4)
sharp(); /* Output # line number */
else { /* If just a few, stuff */
while (--counter >= 0) /* them out ourselves */
putchar('\n');
}
/*
* Process each token on this line.
*/
unget(); /* Reread the char. */
for (;;) { /* For the whole line, */
for (counter = 0; (type[(c = get())] == SPA);) {
#if COMMENT_INVISIBLE | OK_CONCAT == CON_NOEXPAND
if (c != COM_SEP)
counter++;
#else
counter++; /* Skip over blanks */
#endif
}
if (c == EOF_CHAR || c == '\n')
goto end_line; /* Exit line loop */
else if (counter > 0) /* If we got any spaces */
putchar(' '); /* Output one space */
c = macroid(c); /* Grab the token */
if (c == EOF_CHAR || c == '\n') /* From macro exp error */
goto end_line; /* Exit line loop */
switch (type[c]) {
case LET:
if (!catenate()) /* Anything happen? */
fputs(token, stdout); /* Quite ordinary token */
break;
case DIG: /* Output a number */
case DOT: /* Dot may begin floats */
scannumber(c, output);
break;
case QUO: /* char or string const */
scanstring(c, output); /* Copy it to output */
break;
default: /* Some other character */
if (c == TOK_SEP) {
unget(); /* Catenate must see it */
token[0] = EOS; /* Nothing on left side */
catenate();
}
else {
cput(c); /* Just output it */
}
break;
} /* Switch ends */
} /* Line for loop */
end_line: if (c == '\n') { /* Compiling at EOL? */
putchar('\n'); /* Output newline, if */
if (infile->fp == NULL) /* Expanding a macro, */
wrongline = TRUE; /* Output # line later */
}
} /* Continue until EOF */
}
void
output(c)
int c;
/*
* Output one character to stdout -- output() is passed as an
* argument to scanstring()
*/
{
switch (c) {
case ST_QUOTE: /* Stringizer magic */
putchar('"');
break;
case TOK_SEP: /* Token separator */
#if COMMENT_INVISIBLE | OK_CONCAT == CON_NOEXPAND
case COM_SEP: /* Comment magic */
#endif
break; /* These are ignored */
default:
putchar(c);
}
}
static char *sharpfilename = NULL;
FILE_LOCAL
void
sharp()
/*
* Output a line number line.
*/
{
register char *name;
if (keepcomments) /* Make sure # comes on */
putchar('\n'); /* a fresh, new line. */
if (pflag)
goto sharp_exit;
printf("#%s %d", LINE_PREFIX, line);
if (infile->fp != NULL) {
name = (infile->progname != NULL)
? infile->progname : infile->filename;
if (sharpfilename == NULL
|| sharpfilename != NULL && !streq(name, sharpfilename)) {
if (sharpfilename != NULL)
free(sharpfilename);
sharpfilename = savestring(name);
printf(" \"%s\"", name);
}
}
putchar('\n');
sharp_exit:
wrongline = FALSE;
}
