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nethack/sys/unix/cpp1.shr
jwalz d8c87acbbe *** empty log message ***
2002-01-05 21:05:59 +00:00

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# This is a shell archive. Save it in a file, remove anything before
# this line, and then unpack it by entering "sh file". Note, it may
# create directories; files and directories will be owned by you and
# have default permissions.
#
# This archive contains:
#
# makefile.txt
# readme.txt
# cpp.mem
# cpp.h
# cppdef.h
# cpp2.c
#
echo x - makefile.txt
sed 's/^X//' >makefile.txt << 'END-of-makefile.txt'
X#
X# The redefinition of strchr() and strrchr() are needed for
X# Ultrix-32, Unix 4.2 bsd (and maybe some other Unices).
X#
XBSDDEFINE = -Dstrchr=index -Dstrrchr=rindex
X#
X# On certain systems, such as Unix System III, you may need to define
X# $(LINTFLAGS) in the make command line to set system-specific lint flags.
X#
X# This Makefile assumes cpp will replace the "standard" preprocessor.
X# Delete the reference to -DLINE_PREFIX=\"\" if cpp is used stand-alone.
X# LINEFIX is a sed script filter that reinserts #line -- used for testing
X# if LINE_PREFIX is set to "". Note that we must stand on our heads to
X# match the # and a line had better not begin with $. By the way, what
X# we really want is
X# LINEFIX = | sed "s/^#/#line/"
X#
XCPPDEFINE = -DLINE_PREFIX=\"\"
XLINEFIX = | sed "s/^[^ !\"%-~]/&line/"
X#
X# Define OLD_PREPROCESSOR non-zero to make a preprocessor which is
X# "as compatible as possible" with the standard Unix V7 or Ultrix
X# preprocessors. This is needed to rebuild 4.2bsd, for example, as
X# the preprocessor is used to modify assembler code, rather than C.
X# This is not recommended for current development. OLD_PREPROCESSOR
X# forces the following definitions:
X# OK_DOLLAR FALSE $ is not allowed in variables
X# OK_CONCAT FALSE # cannot concatenate tokens
X# COMMENT_INVISIBLE TRUE old-style comment concatenation
X# STRING_FORMAL TRUE old-style string expansion
X#
XOLDDEFINE = -DOLD_PREPROCESSOR=1
X#
X# DEFINES collects all -D arguments for cc and lint:
X# Change DEFINES = $(BSDDEFINE) $(CPPDEFINE) $(OLDDEFINE)
X# for an old-style preprocessor.
X#
X# DEFINES = $(BSDDEFINE) $(CPPDEFINE)
XDEFINES = $(CPPDEFINE)
X
XCFLAGS = -O $(DEFINES)
X
X#
X# ** compile cpp
X#
XSRCS = cpp1.c cpp2.c cpp3.c cpp4.c cpp5.c cpp6.c
XOBJS = cpp1.o cpp2.o cpp3.o cpp4.o cpp5.o cpp6.o
Xcpp: $(OBJS)
X $(CC) $(CFLAGS) $(OBJS) -o cpp
X
X#
X# ** Test cpp by preprocessing itself, compiling the result,
X# ** repeating the process and diff'ing the result. Note: this
X# ** is not a good test of cpp, but a simple verification.
X# ** The diff's should not report any changes.
X# ** Note that a sed script may be executed for each compile
X#
Xtest:
X cpp cpp1.c $(LINEFIX) >old.tmp1.c
X cpp cpp2.c $(LINEFIX) >old.tmp2.c
X cpp cpp3.c $(LINEFIX) >old.tmp3.c
X cpp cpp4.c $(LINEFIX) >old.tmp4.c
X cpp cpp5.c $(LINEFIX) >old.tmp5.c
X cpp cpp6.c $(LINEFIX) >old.tmp6.c
X $(CC) $(CFLAGS) old.tmp[123456].c
X a.out cpp1.c >new.tmp1.c
X a.out cpp2.c >new.tmp2.c
X a.out cpp3.c >new.tmp3.c
X a.out cpp4.c >new.tmp4.c
X a.out cpp5.c >new.tmp5.c
X a.out cpp6.c >new.tmp6.c
X diff old.tmp1.c new.tmp1.c
X diff old.tmp2.c new.tmp2.c
X diff old.tmp3.c new.tmp3.c
X diff old.tmp4.c new.tmp4.c
X diff old.tmp5.c new.tmp5.c
X diff old.tmp6.c new.tmp6.c
X rm a.out old.tmp[123456].* new.tmp[123456].*
X
X#
X# A somewhat more extensive test is provided by the "clock"
X# program (which is not distributed). Substitute your favorite
X# macro-rich program here.
X#
Xclock: clock.c cpp
X cpp clock.c $(LINEFIX) >temp.cpp.c
X cc temp.cpp.c -lcurses -ltermcap -o clock
X rm temp.cpp.c
X
X#
X# ** Lint the code
X#
X
Xlint: $(SRCS)
X lint $(LINTFLAGS) $(DEFINES) $(SRCS)
X
X#
X# ** Remove unneeded files
X#
Xclean:
X rm -f $(OBJS) cpp
X
X#
X# ** Rebuild the archive files needed to distribute cpp
X# ** Uses the Decus C archive utility.
X#
X
Xarchc: archc.c
X $(CC) $(CFLAGS) archc.c -o archc
X
Xarchx: archx.c
X $(CC) $(CFLAGS) archx.c -o archx
X
Xarchive: archc
X archc readme.txt cpp.mem archx.c archc.c cpp.rno makefile.txt \
X cpp*.h >cpp1.arc
X archc cpp1.c cpp2.c cpp3.c >cpp2.arc
X archc cpp4.c cpp5.c cpp6.c >cpp3.arc
X
X#
X# Object module dependencies
X#
X
Xcpp1.o : cpp1.c cpp.h cppdef.h
X
Xcpp2.o : cpp2.c cpp.h cppdef.h
X
Xcpp3.o : cpp3.c cpp.h cppdef.h
X
Xcpp4.o : cpp4.c cpp.h cppdef.h
X
Xcpp5.o : cpp5.c cpp.h cppdef.h
X
Xcpp6.o : cpp6.c cpp.h cppdef.h
X
X
END-of-makefile.txt
echo x - readme.txt
sed 's/^X//' >readme.txt << 'END-of-readme.txt'
X
XDecus cpp is a public-domain implementation of the C preprocessor.
XIt runs on VMS native (Vax C), VMS compatibilty mode (Decus C),
XRSX-11M, RSTS/E, P/OS, and RT11, as well as on several varieties
Xof Unix, including Ultrix. Decus cpp attempts to implement features
Xin the Draft ANSI Standard for the C language. It should be noted,
Xhowever, that this standard is under active development: the current
Xdraft of the standard explicitly states that "readers are requested
Xnot to specify or claim conformance to this draft." Thus readers
Xand users of Decus cpp should not assume that it conforms to the
Xdraft standard, or that it will conform to the actual C language
Xstandard.
X
XThese notes describe how to extract the cpp source files, configure it
Xfor your needs, and mention a few design decisions that may be of interest
Xto maintainers.
X
X Installation
X
XBecause the primary development of cpp was not on Unix, it
Xis distributed using the Decus C archive program (quite similar
Xto the archiver published in Kernighan and Plauger's Software
XTools). To extract the files from the net.sources distribution,
Xsave this message as cpp1.arc and the other two distribution
Xfiles as cpp2.arc and cpp3.arc. Then, using your favorite editor,
Xlocate the archx.c program, just following the line beginning with
X"-h- archx.c" -- the format of the distribution is just:
X
X -h- readme.txt
X ... this file
X -h- cpp.mem
X ... description of cpp
X -h- archx.c
X ... archx.c program -- extracts archives
X -h- archc.c
X ... archc.c program -- creates archives
X
XCompile archx.c -- it shouldn't require any special editing.
XThen run it as follows:
X
X archx *.arc
X
XYou do not need to remove mail headers from the saved messages.
X
XYou should then read through cppdef.h to make sure the HOST and
XTARGET (and other implementation-specific) definitions are set
Xcorrectly for your machine, editing them as needed.
X
XYou may then copy makefile.txt to Makefile, editing it as needed
Xfor your particular system. On Unix, cpp should be compiled
Xby make without further difficulty. On other operating systems,
Xyou should compile the six source modules, linking them together.
XNote that, on Decus C based systems, you must extend the default
Xstack allocation. The Decus C build utility will create the
Xappropriate command file.
X
X Support Notes
X
XThe USENET distribution kit was designed to keep all submissions around
X50,000 bytes:
X
Xcpp1.arc:
X readme.txt This file
X cpp.mem Documentation page (see below)
X archx.c Archive extraction program
X archc.c Archive construction program
X cpp.rno Source for cpp.mem (see below)
X makefile.txt Unix makefile -- copy to Makefile
X cpp.h Main header file (structure def's and globals)
X cppdef.h Configuration file (host and target definitions)
X
Xcpp2.arc:
X cpp1.c Mainline code, documentation master sources
X cpp2.c most #control processing
X cpp3.c filename stuff and command line parsing
Xcpp3.arc:
X cpp4.c #define processor
X cpp5.c #if <expr> processor
X cpp6.c Support code (symbol table and I/O routines)
X
XCpp intentionally does not rely on the presence of a full-scale
Xmacro preprocessor, it does require the simple parameter substitution
Xpreprocessor capabilities of Unix V6 and Decus C. If your C
Xlanguage lacks full preprocessing, you should make sure "nomacargs"
Xis #define'd in cpp.h. (This is done automatically by the Decus C
Xcompiler.)
X
XThe documentation (manual page) for cpp is included as cpp.mem
Xand cpp.rno. Cpp.rno is in Dec Runoff format, built by a Decus C
Xutility (getrno) from original source which is embedded in cpp1.c.
XTo my knowledge, there is no equivalent program that creates
Xthe nroff source appropriate for Unix.
X
XI would be happy to receive fixes to any problems you encounter.
XAs I do not maintain distribution kit base-levels, bare-bones
Xdiff listings without sufficient context are not very useful.
XIt is unlikely that I can find time to help you with other
Xdifficulties.
X
X Acknowledgements
X
XI received a great deal of help from many people in debugging cpp.
XAlan Feuer and Sam Kendall used "state of the art" run-time code
Xcheckers to locate several errors. Ed Keiser found problems when
Xcpp was used on machines with different int and pointer sizes.
XDave Conroy helped with the initial debugging, while Arthur Olsen
Xand George Rosenberg found (and solved) several problems in the
Xfirst USENET release.
X
XMartin Minow
Xdecvax!minow
X
END-of-readme.txt
echo x - cpp.mem
sed 's/^X//' >cpp.mem << 'END-of-cpp.mem'
X
X
X
X
X 1.0 C Pre-Processor
X
X
X
X *******
X * cpp *
X *******
X
X
X
X NAME: cpp -- C Pre-Processor
X
X SYNOPSIS:
X
X cpp [-options] [infile [outfile]]
X
X DESCRIPTION:
X
X CPP reads a C source file, expands macros and include
X files, and writes an input file for the C compiler. If
X no file arguments are given, CPP reads from stdin and
X writes to stdout. If one file argument is given, it
X will define the input file, while two file arguments
X define both input and output files. The file name "-"
X is a synonym for stdin or stdout as appropriate.
X
X The following options are supported. Options may be
X given in either case.
X
X -C If set, source-file comments are written
X to the output file. This allows the
X output of CPP to be used as the input to
X a program, such as lint, that expects
X commands embedded in specially-formatted
X comments.
X
X -Dname=value Define the name as if the programmer
X wrote
X
X #define name value
X
X at the start of the first file. If
X "=value" is not given, a value of "1"
X will be used.
X
X On non-unix systems, all alphabetic text
X will be forced to upper-case.
X
X -E Always return "success" to the operating
X system, even if errors were detected.
X Note that some fatal errors, such as a
X missing #include file, will terminate
X CPP, returning "failure" even if the -E
X option is given.
X Page 2
X cpp C Pre-Processor
X
X
X -Idirectory Add this directory to the list of
X directories searched for #include "..."
X and #include <...> commands. Note that
X there is no space between the "-I" and
X the directory string. More than one -I
X command is permitted. On non-Unix
X systems "directory" is forced to
X upper-case.
X
X -N CPP normally predefines some symbols
X defining the target computer and
X operating system. If -N is specified,
X no symbols will be predefined. If -N -N
X is specified, the "always present"
X symbols, __LINE__, __FILE__, and
X __DATE__ are not defined.
X
X -Stext CPP normally assumes that the size of
X the target computer's basic variable
X types is the same as the size of these
X types of the host computer. (This can
X be overridden when CPP is compiled,
X however.) The -S option allows dynamic
X respecification of these values. "text"
X is a string of numbers, separated by
X commas, that specifies correct sizes.
X The sizes must be specified in the exact
X order:
X
X char short int long float double
X
X If you specify the option as "-S*text",
X pointers to these types will be
X specified. -S* takes one additional
X argument for pointer to function (e.g.
X int (*)())
X
X For example, to specify sizes
X appropriate for a PDP-11, you would
X write:
X
X c s i l f d func
X -S1,2,2,2,4,8,
X -S*2,2,2,2,2,2,2
X
X Note that all values must be specified.
X
X -Uname Undefine the name as if
X
X #undef name
X
X were given. On non-Unix systems, "name"
X will be forced to upper-case.
X Page 3
X cpp C Pre-Processor
X
X
X -Xnumber Enable debugging code. If no value is
X given, a value of 1 will be used. (For
X maintenence of CPP only.)
X
X
X PRE-DEFINED VARIABLES:
X
X When CPP begins processing, the following variables will
X have been defined (unless the -N option is specified):
X
X Target computer (as appropriate):
X
X pdp11, vax, M68000 m68000 m68k
X
X Target operating system (as appropriate):
X
X rsx, rt11, vms, unix
X
X Target compiler (as appropriate):
X
X decus, vax11c
X
X The implementor may add definitions to this list. The
X default definitions match the definition of the host
X computer, operating system, and C compiler.
X
X The following are always available unless undefined (or
X -N was specified twice):
X
X __FILE__ The input (or #include) file being
X compiled (as a quoted string).
X
X __LINE__ The line number being compiled.
X
X __DATE__ The date and time of compilation as a
X Unix ctime quoted string (the trailing
X newline is removed). Thus,
X
X printf("Bug at line %s,", __LINE__);
X printf(" source file %s", __FILE__);
X printf(" compiled on %s", __DATE__);
X
X
X DRAFT PROPOSED ANSI STANDARD CONSIDERATIONS:
X
X The current version of the Draft Proposed Standard
X explicitly states that "readers are requested not to
X specify or claim conformance to this draft." Readers and
X users of Decus CPP should not assume that Decus CPP
X conforms to the standard, or that it will conform to the
X actual C Language Standard.
X
X When CPP is itself compiled, many features of the Draft
X Proposed Standard that are incompatible with existing
X Page 4
X cpp C Pre-Processor
X
X
X preprocessors may be disabled. See the comments in
X CPP's source for details.
X
X The latest version of the Draft Proposed Standard (as
X reflected in Decus CPP) is dated November 12, 1984.
X
X Comments are removed from the input text. The comment
X is replaced by a single space character. The -C option
X preserves comments, writing them to the output file.
X
X The '$' character is considered to be a letter. This is
X a permitted extension.
X
X The following new features of C are processed by CPP:
X
X #elif expression (#else #if)
X '\xNNN' (Hexadecimal constant)
X '\a' (Ascii BELL)
X '\v' (Ascii Vertical Tab)
X #if defined NAME 1 if defined, 0 if not
X #if defined (NAME) 1 if defined, 0 if not
X #if sizeof (basic type)
X unary +
X 123U, 123LU Unsigned ints and longs.
X 12.3L Long double numbers
X token#token Token concatenation
X #include token Expands to filename
X
X The Draft Proposed Standard has extended C, adding a
X constant string concatenation operator, where
X
X "foo" "bar"
X
X is regarded as the single string "foobar". (This does
X not affect CPP's processing but does permit a limited
X form of macro argument substitution into strings as will
X be discussed.)
X
X The Standard Committee plans to add token concatenation
X to #define command lines. One suggested implementation
X is as follows: the sequence "Token1#Token2" is treated
X as if the programmer wrote "Token1Token2". This could
X be used as follows:
X
X #line 123
X #define ATLINE foo#__LINE__
X
X ATLINE would be defined as foo123.
X
X Note that "Token2" must either have the format of an
X identifier or be a string of digits. Thus, the string
X
X #define ATLINE foo#1x3
X Page 5
X cpp C Pre-Processor
X
X
X generates two tokens: "foo1" and "x3".
X
X If the tokens T1 and T2 are concatenated into T3, this
X implementation operates as follows:
X
X 1. Expand T1 if it is a macro.
X 2. Expand T2 if it is a macro.
X 3. Join the tokens, forming T3.
X 4. Expand T3 if it is a macro.
X
X A macro formal parameter will be substituted into a
X string or character constant if it is the only component
X of that constant:
X
X #define VECSIZE 123
X #define vprint(name, size) \
X printf("name" "[" "size" "] = {\n")
X ... vprint(vector, VECSIZE);
X
X expands (effectively) to
X
X vprint("vector[123] = {\n");
X
X Note that this will be useful if your C compiler
X supports the new string concatenation operation noted
X above. As implemented here, if you write
X
X #define string(arg) "arg"
X ... string("foo") ...
X
X This implementation generates "foo", rather than the
X strictly correct ""foo"" (which will probably generate
X an error message). This is, strictly speaking, an error
X in CPP and may be removed from future releases.
X
X ERROR MESSAGES:
X
X Many. CPP prints warning or error messages if you try
X to use multiple-byte character constants
X (non-transportable) if you #undef a symbol that was not
X defined, or if your program has potentially nested
X comments.
X
X AUTHOR:
X
X Martin Minow
X
X BUGS:
X
X The #if expression processor uses signed integers only.
X I.e, #if 0xFFFFu < 0 may be TRUE.
X
END-of-cpp.mem
echo x - cpp.h
sed 's/^X//' >cpp.h << 'END-of-cpp.h'
X
X/*
X * I n t e r n a l D e f i n i t i o n s f o r C P P
X *
X * In general, definitions in this file should not be changed.
X */
X
X#ifndef TRUE
X#define TRUE 1
X#define FALSE 0
X#endif
X#ifndef EOS
X/*
X * This is predefined in Decus C
X */
X#define EOS '\0' /* End of string */
X#endif
X#define EOF_CHAR 0 /* Returned by get() on eof */
X#define NULLST ((char *) NULL) /* Pointer to nowhere (linted) */
X#define DEF_NOARGS (-1) /* #define foo vs #define foo() */
X
X/*
X * The following may need to change if the host system doesn't use ASCII.
X */
X#define DEF_MAGIC 0x1D /* Magic for #defines */
X#define TOK_SEP 0x1E /* Token concatenation delim. */
X#define COM_SEP 0x1F /* Magic comment separator */
X
X/*
X * Note -- in Ascii, the following will map macro formals onto DEL + the
X * C1 control character region (decimal 128 .. (128 + PAR_MAC)) which will
X * be ok as long as PAR_MAC is less than 33). Note that the last PAR_MAC
X * value is reserved for string substitution.
X */
X
X#define MAC_PARM 0x7F /* Macro formals start here */
X#if PAR_MAC >= 33
X assertion fails -- PAR_MAC isn't less than 33
X#endif
X#define LASTPARM (PAR_MAC - 1)
X
X/*
X * Character type codes.
X */
X
X#define INV 0 /* Invalid, must be zero */
X#define OP_EOE INV /* End of expression */
X#define DIG 1 /* Digit */
X#define LET 2 /* Identifier start */
X#define FIRST_BINOP OP_ADD
X#define OP_ADD 3
X#define OP_SUB 4
X#define OP_MUL 5
X#define OP_DIV 6
X#define OP_MOD 7
X#define OP_ASL 8
X#define OP_ASR 9
X#define OP_AND 10 /* &, not && */
X#define OP_OR 11 /* |, not || */
X#define OP_XOR 12
X#define OP_EQ 13
X#define OP_NE 14
X#define OP_LT 15
X#define OP_LE 16
X#define OP_GE 17
X#define OP_GT 18
X#define OP_ANA 19 /* && */
X#define OP_ORO 20 /* || */
X#define OP_QUE 21 /* ? */
X#define OP_COL 22 /* : */
X#define OP_CMA 23 /* , (relevant?) */
X#define LAST_BINOP OP_CMA /* Last binary operand */
X/*
X * The following are unary.
X */
X#define FIRST_UNOP OP_PLU /* First Unary operand */
X#define OP_PLU 24 /* + (draft ANSI standard) */
X#define OP_NEG 25 /* - */
X#define OP_COM 26 /* ~ */
X#define OP_NOT 27 /* ! */
X#define LAST_UNOP OP_NOT
X#define OP_LPA 28 /* ( */
X#define OP_RPA 29 /* ) */
X#define OP_END 30 /* End of expression marker */
X#define OP_MAX (OP_END + 1) /* Number of operators */
X#define OP_FAIL (OP_END + 1) /* For error returns */
X
X/*
X * The following are for lexical scanning only.
X */
X
X#define QUO 65 /* Both flavors of quotation */
X#define DOT 66 /* . might start a number */
X#define SPA 67 /* Space and tab */
X#define BSH 68 /* Just a backslash */
X#define END 69 /* EOF */
X
X/*
X * These bits are set in ifstack[]
X */
X#define WAS_COMPILING 1 /* TRUE if compile set at entry */
X#define ELSE_SEEN 2 /* TRUE when #else processed */
X#define TRUE_SEEN 4 /* TRUE when #if TRUE processed */
X
X/*
X * Define bits for the basic types and their adjectives
X */
X
X#define T_CHAR 1
X#define T_INT 2
X#define T_FLOAT 4
X#define T_DOUBLE 8
X#define T_SHORT 16
X#define T_LONG 32
X#define T_SIGNED 64
X#define T_UNSIGNED 128
X#define T_PTR 256 /* Pointer */
X#define T_FPTR 512 /* Pointer to functions */
X
X/*
X * The DEFBUF structure stores information about #defined
X * macros. Note that the defbuf->repl information is always
X * in malloc storage.
X */
X
Xtypedef struct defbuf {
X struct defbuf *link; /* Next define in chain */
X char *repl; /* -> replacement */
X int hash; /* Symbol table hash */
X int nargs; /* For define(args) */
X char name[1]; /* #define name */
X} DEFBUF;
X
X/*
X * The FILEINFO structure stores information about open files
X * and macros being expanded.
X */
X
Xtypedef struct fileinfo {
X char *bptr; /* Buffer pointer */
X int line; /* for include or macro */
X FILE *fp; /* File if non-null */
X struct fileinfo *parent; /* Link to includer */
X char *filename; /* File/macro name */
X char *progname; /* From #line statement */
X unsigned int unrecur; /* For macro recursion */
X char buffer[1]; /* current input line */
X} FILEINFO;
X
X/*
X * The SIZES structure is used to store the values for #if sizeof
X */
X
Xtypedef struct sizes {
X short bits; /* If this bit is set, */
X short size; /* this is the datum size value */
X short psize; /* this is the pointer size */
X} SIZES;
X/*
X * nomacarg is a built-in #define on Decus C.
X */
X
X#ifdef nomacarg
X#define cput output /* cput concatenates tokens */
X#else
X#if COMMENT_INVISIBLE
X#define cput(c) { if (c != TOK_SEP && c != COM_SEP) putchar(c); }
X#else
X#define cput(c) { if (c != TOK_SEP) putchar(c); }
X#endif
X#endif
X
X#ifndef nomacarg
X#define streq(s1, s2) (strcmp(s1, s2) == 0)
X#endif
X
X/*
X * Error codes. VMS uses system definitions.
X * Decus C codes are defined in stdio.h.
X * Others are cooked to order.
X */
X
X#if HOST == SYS_VMS
X#include <ssdef.h>
X#include <stsdef.h>
X#define IO_NORMAL (SS$_NORMAL | STS$M_INHIB_MSG)
X#define IO_ERROR SS$_ABORT
X#endif
X/*
X * Note: IO_NORMAL and IO_ERROR are defined in the Decus C stdio.h file
X */
X#ifndef IO_NORMAL
X#define IO_NORMAL 0
X#endif
X#ifndef IO_ERROR
X#define IO_ERROR 1
X#endif
X
X/*
X * Externs
X */
X
Xextern int line; /* Current line number */
Xextern int wrongline; /* Force #line to cc pass 1 */
Xextern char type[]; /* Character classifier */
Xextern char token[IDMAX + 1]; /* Current input token */
Xextern int instring; /* TRUE if scanning string */
Xextern int inmacro; /* TRUE if scanning #define */
Xextern int errors; /* Error counter */
Xextern int recursion; /* Macro depth counter */
Xextern char ifstack[BLK_NEST]; /* #if information */
X#define compiling ifstack[0]
Xextern char *ifptr; /* -> current ifstack item */
Xextern char *incdir[NINCLUDE]; /* -i directories */
Xextern char **incend; /* -> active end of incdir */
Xextern int cflag; /* -C option (keep comments) */
Xextern int eflag; /* -E option (ignore errors) */
Xextern int nflag; /* -N option (no pre-defines) */
Xextern int rec_recover; /* unwind recursive macros */
Xextern char *preset[]; /* Standard predefined symbols */
Xextern char *magic[]; /* Magic predefined symbols */
Xextern FILEINFO *infile; /* Current input file */
Xextern char work[NWORK + 1]; /* #define scratch */
Xextern char *workp; /* Free space in work */
X#if DEBUG
Xextern int debug; /* Debug level */
X#endif
Xextern int keepcomments; /* Don't remove comments if set */
Xextern SIZES size_table[]; /* For #if sizeof sizes */
Xextern char *getmem(); /* Get memory or die. */
Xextern DEFBUF *lookid(); /* Look for a #define'd thing */
Xextern DEFBUF *defendel(); /* Symbol table enter/delete */
Xextern char *savestring(); /* Stuff string in malloc mem. */
Xextern char *strcpy();
Xextern char *strcat();
Xextern char *strrchr();
Xextern char *strchr();
Xextern long time();
X/* extern char *sprintf(); /* Lint needs this */
END-of-cpp.h
echo x - cppdef.h
sed 's/^X//' >cppdef.h << 'END-of-cppdef.h'
X/*
X * S y s t e m D e p e n d e n t
X * D e f i n i t i o n s f o r C P P
X *
X * Definitions in this file may be edited to configure CPP for particular
X * host operating systems and target configurations.
X *
X * NOTE: cpp assumes it is compiled by a compiler that supports macros
X * with arguments. If this is not the case (as for Decus C), #define
X * nomacarg -- and provide function equivalents for all macros.
X *
X * cpp also assumes the host and target implement the Ascii character set.
X * If this is not the case, you will have to do some editing here and there.
X */
X
X/*
X * This redundant definition of TRUE and FALSE works around
X * a limitation of Decus C.
X */
X#ifndef TRUE
X#define TRUE 1
X#define FALSE 0
X#endif
X
X/*
X * Define the HOST operating system. This is needed so that
X * cpp can use appropriate filename conventions.
X */
X#define SYS_UNKNOWN 0
X#define SYS_UNIX 1
X#define SYS_VMS 2
X#define SYS_RSX 3
X#define SYS_RT11 4
X#define SYS_LATTICE 5
X#define SYS_ONYX 6
X#define SYS_68000 7
X#define SYS_GCOS 8
X#define SYS_IBM 9
X#define SYS_OS 10
X#define SYS_TSS 11
X
X#ifndef HOST
X#ifdef unix
X#define HOST SYS_UNIX
X#else
X#ifdef vms
X#define HOST SYS_VMS
X#else
X#ifdef rsx
X#define HOST SYS_RSX
X#else
X#ifdef rt11
X#define HOST SYS_RT11
X#else
X#ifdef dmert
X#define HOST SYS_DMERT
X#else
X#ifdef gcos
X#define HOST SYS_GCOS
X#else
X#ifdef ibm
X#define HOST SYS_IBM
X#else
X#ifdef os
X#define HOST SYS_OS
X#else
X#ifdef tss
X#define HOST SYS_TSS
X#endif
X#endif
X#endif
X#endif
X#endif
X#endif
X#endif
X#endif
X#endif
X
X#ifndef HOST
X#define HOST SYS_UNKNOWN
X#endif
X
X/*
X * We assume that the target is the same as the host system
X */
X#ifndef TARGET
X#define TARGET HOST
X#endif
X
X/*
X * In order to predefine machine-dependent constants,
X * several strings are defined here:
X *
X * MACHINE defines the target cpu (by name)
X * SYSTEM defines the target operating system
X * COMPILER defines the target compiler
X *
X * The above may be #defined as "" if they are not wanted.
X * They should not be #defined as NULL.
X *
X * LINE_PREFIX defines the # output line prefix, if not "line"
X * This should be defined as "" if cpp is to replace
X * the "standard" C pre-processor.
X *
X * FILE_LOCAL marks functions which are referenced only in the
X * file they reside. Some C compilers allow these
X * to be marked "static" even though they are referenced
X * by "extern" statements elsewhere.
X *
X * OK_DOLLAR Should be set TRUE if $ is a valid alphabetic character
X * in identifiers (default), or zero if $ is invalid.
X * Default is TRUE.
X *
X * OK_CONCAT Should be set TRUE if # may be used to concatenate
X * tokens in macros (per the Ansi Draft Standard) or
X * FALSE for old-style # processing (needed if cpp is
X * to process assembler source code).
X *
X * OK_DATE Predefines the compilation date if set TRUE.
X * Not permitted by the Nov. 12, 1984 Draft Standard.
X *
X * S_CHAR etc. Define the sizeof the basic TARGET machine word types.
X * By default, sizes are set to the values for the HOST
X * computer. If this is inappropriate, see the code in
X * cpp3.c for details on what to change. Also, if you
X * have a machine where sizeof (signed int) differs from
X * sizeof (unsigned int), you will have to edit code and
X * tables in cpp3.c (and extend the -S option definition.)
X *
X * CPP_LIBRARY May be defined if you have a site-specific include directory
X * which is to be searched *before* the operating-system
X * specific directories.
X */
X
X#if TARGET == SYS_LATTICE
X/*
X * We assume the operating system is pcdos for the IBM-PC.
X * We also assume the small model (just like the PDP-11)
X */
X#define MACHINE "i8086"
X#define SYSTEM "pcdos"
X#endif
X
X#if TARGET == SYS_ONYX
X#define MACHINE "z8000"
X#define SYSTEM "unix"
X#endif
X
X#if TARGET == SYS_VMS
X#define MACHINE "vax"
X#define SYSTEM "vms"
X#define COMPILER "vax11c"
X#endif
X
X#if TARGET == SYS_RSX
X#define MACHINE "pdp11"
X#define SYSTEM "rsx"
X#define COMPILER "decus"
X#endif
X
X#if TARGET == SYS_RT11
X#define MACHINE "pdp11"
X#define SYSTEM "rt11"
X#define COMPILER "decus"
X#endif
X
X#if TARGET == SYS_68000
X/*
X * All three machine designators have been seen in various systems.
X * Warning -- compilers differ as to sizeof (int). cpp3 assumes that
X * sizeof (int) == 2
X */
X#define MACHINE "M68000", "m68000", "m68k"
X#define SYSTEM "unix"
X#endif
X
X#if TARGET == SYS_UNIX
X#define SYSTEM "unix"
X#ifdef pdp11
X#define MACHINE "pdp11"
X#endif
X#ifdef vax
X#define MACHINE "vax"
X#endif
X#ifdef u370
X#define MACHINE "u370"
X#endif
X#ifdef interdata
X#define MACHINE "interdata"
X#endif
X#ifdef u3b
X#define MACHINE "u3b"
X#endif
X#ifdef u3b5
X#define MACHINE "u3b5"
X#endif
X#ifdef u3b2
X#define MACHINE "u3b2"
X#endif
X#ifdef u3b20d
X#define MACHINE "u3b20d"
X#endif
X#endif
X#endif
X
X/*
X * defaults
X */
X
X#ifndef MSG_PREFIX
X#define MSG_PREFIX "cpp: "
X#endif
X
X#ifndef LINE_PREFIX
X#ifdef decus
X#define LINE_PREFIX ""
X#else
X#define LINE_PREFIX "line"
X#endif
X#endif
X
X/*
X * OLD_PREPROCESSOR forces the definition of OK_DOLLAR, OK_CONCAT,
X * COMMENT_INVISIBLE, and STRING_FORMAL to values appropriate for
X * an old-style preprocessor.
X */
X
X#ifndef OLD_PREPROCESSOR
X#define OLD_PREPROCESSOR FALSE
X#endif
X
X#if OLD_PREPROCESSOR
X#define OK_DOLLAR FALSE
X#define OK_CONCAT FALSE
X#define COMMENT_INVISIBLE TRUE
X#define STRING_FORMAL TRUE
X#endif
X
X/*
X * RECURSION_LIMIT may be set to -1 to disable the macro recursion test.
X */
X#ifndef RECURSION_LIMIT
X#define RECURSION_LIMIT 1000
X#endif
X
X/*
X * BITS_CHAR may be defined to set the number of bits per character.
X * it is needed only for multi-byte character constants.
X */
X#ifndef BITS_CHAR
X#define BITS_CHAR 8
X#endif
X
X/*
X * BIG_ENDIAN is set TRUE on machines (such as the IBM 360 series)
X * where 'ab' stores 'a' in the high-bits and 'b' in the low-bits.
X * It is set FALSE on machines (such as the PDP-11 and Vax-11)
X * where 'ab' stores 'a' in the low-bits and 'b' in the high-bits.
X * (Or is it the other way around?) -- Warning: BIG_ENDIAN code is untested.
X */
X#ifndef BIG_ENDIAN
X#define BIG_ENDIAN FALSE
X#endif
X
X/*
X * COMMENT_INVISIBLE may be defined to allow "old-style" comment
X * processing, whereby the comment becomes a zero-length token
X * delimiter. This permitted tokens to be concatenated in macro
X * expansions. This was removed from the Draft Ansi Standard.
X */
X#ifndef COMMENT_INVISIBLE
X#define COMMENT_INVISIBLE FALSE
X#endif
X
X/*
X * STRING_FORMAL may be defined to allow recognition of macro parameters
X * anywhere in replacement strings. This was removed from the Draft Ansi
X * Standard and a limited recognition capability added.
X */
X#ifndef STRING_FORMAL
X#define STRING_FORMAL FALSE
X#endif
X
X/*
X * OK_DOLLAR enables use of $ as a valid "letter" in identifiers.
X * This is a permitted extension to the Ansi Standard and is required
X * for e.g., VMS, RSX-11M, etc. It should be set FALSE if cpp is
X * used to preprocess assembler source on Unix systems. OLD_PREPROCESSOR
X * sets OK_DOLLAR FALSE for that reason.
X */
X#ifndef OK_DOLLAR
X#define OK_DOLLAR TRUE
X#endif
X
X/*
X * OK_CONCAT enables (one possible implementation of) token concatenation.
X * If cpp is used to preprocess Unix assembler source, this should be
X * set FALSE as the concatenation character, #, is used by the assembler.
X */
X#ifndef OK_CONCAT
X#define OK_CONCAT TRUE
X#endif
X
X/*
X * OK_DATE may be enabled to predefine today's date as a string
X * at the start of each compilation. This is apparently not permitted
X * by the Draft Ansi Standard.
X */
X#ifndef OK_DATE
X#define OK_DATE TRUE
X#endif
X
X/*
X * Some common definitions.
X */
X
X#ifndef DEBUG
X#define DEBUG FALSE
X#endif
X
X/*
X * The following definitions are used to allocate memory for
X * work buffers. In general, they should not be modified
X * by implementors.
X *
X * PAR_MAC The maximum number of #define parameters (31 per Standard)
X * Note: we need another one for strings.
X * IDMAX The longest identifier, 31 per Ansi Standard
X * NBUFF Input buffer size
X * NWORK Work buffer size -- the longest macro
X * must fit here after expansion.
X * NEXP The nesting depth of #if expressions
X * NINCLUDE The number of directories that may be specified
X * on a per-system basis, or by the -I option.
X * BLK_NEST The number of nested #if's permitted.
X */
X
X#define IDMAX 31
X#define PAR_MAC (31 + 1)
X#define NBUFF 1024
X#define NWORK 1024
X#define NEXP 128
X#define NINCLUDE 7
X#define NPARMWORK (NWORK * 2)
X#define BLK_NEST 32
X
X/*
X * Some special constants. These may need to be changed if cpp
X * is ported to a wierd machine.
X *
X * NOTE: if cpp is run on a non-ascii machine, ALERT and VT may
X * need to be changed. They are used to implement the proposed
X * ANSI standard C control characters '\a' and '\v' only.
X * DEL is used to tag macro tokens to prevent #define foo foo
X * from looping. Note that we don't try to prevent more elaborate
X * #define loops from occurring.
X */
X
X#ifndef ALERT
X#define ALERT '\007' /* '\a' is "Bell" */
X#endif
X
X#ifndef VT
X#define VT '\013' /* Vertical Tab CTRL/K */
X#endif
X
X
X#ifndef FILE_LOCAL
X#ifdef decus
X#define FILE_LOCAL static
X#else
X#ifdef vax11c
X#define FILE_LOCAL static
X#else
X#define FILE_LOCAL /* Others are global */
X#endif
X#endif
X#endif
X
END-of-cppdef.h
echo x - cpp2.c
sed 's/^X//' >cpp2.c << 'END-of-cpp2.c'
X/*
X * C P P 2 . C
X *
X * Process #control lines
X *
X * Edit history
X * 13-Nov-84 MM Split from cpp1.c
X */
X
X#include <stdio.h>
X#include <ctype.h>
X#include "cppdef.h"
X#include "cpp.h"
X#if HOST == SYS_VMS
X/*
X * Include the rms stuff. (We can't just include rms.h as it uses the
X * VaxC-specific library include syntax that Decus CPP doesn't support.
X * By including things by hand, we can CPP ourself.)
X */
X#include <nam.h>
X#include <fab.h>
X#include <rab.h>
X#include <rmsdef.h>
X#endif
X
X/*
X * Generate (by hand-inspection) a set of unique values for each control
X * operator. Note that this is not guaranteed to work for non-Ascii
X * machines. CPP won't compile if there are hash conflicts.
X */
X
X#define L_assert ('a' + ('s' << 1))
X#define L_define ('d' + ('f' << 1))
X#define L_elif ('e' + ('i' << 1))
X#define L_else ('e' + ('s' << 1))
X#define L_endif ('e' + ('d' << 1))
X#define L_ident ('i' + ('e' << 1))
X#define L_if ('i' + (EOS << 1))
X#define L_ifdef ('i' + ('d' << 1))
X#define L_ifndef ('i' + ('n' << 1))
X#define L_include ('i' + ('c' << 1))
X#define L_line ('l' + ('n' << 1))
X#define L_nogood (EOS + (EOS << 1)) /* To catch #i */
X#define L_pragma ('p' + ('a' << 1))
X#define L_sccs ('s' + ('c' << 1))
X#define L_undef ('u' + ('d' << 1))
X#if DEBUG
X#define L_debug ('d' + ('b' << 1)) /* #debug */
X#define L_nodebug ('n' + ('d' << 1)) /* #nodebug */
X#endif
X
Xint
Xcontrol(counter)
Xint counter; /* Pending newline counter */
X/*
X * Process #control lines. Simple commands are processed inline,
X * while complex commands have their own subroutines.
X *
X * The counter is used to force out a newline before #line, and
X * #pragma commands. This prevents these commands from ending up at
X * the end of the previous line if cpp is invoked with the -C option.
X */
X{
X register int c;
X register char *tp;
X register int hash;
X char *ep;
X
X c = skipws();
X if (c == '\n' || c == EOF_CHAR)
X return (counter + 1);
X if (!isdigit(c))
X scanid(c); /* Get #word to token[] */
X else {
X unget(); /* Hack -- allow #123 as a */
X strcpy(token, "line"); /* synonym for #line 123 */
X }
X hash = (token[1] == EOS) ? L_nogood : (token[0] + (token[2] << 1));
X switch (hash) {
X case L_assert: tp = "assert"; break;
X case L_define: tp = "define"; break;
X case L_elif: tp = "elif"; break;
X case L_else: tp = "else"; break;
X case L_endif: tp = "endif"; break;
X case L_ident: tp = "ident"; break;
X case L_if: tp = "if"; break;
X case L_ifdef: tp = "ifdef"; break;
X case L_ifndef: tp = "ifndef"; break;
X case L_include: tp = "include"; break;
X case L_line: tp = "line"; break;
X case L_pragma: tp = "pragma"; break;
X case L_sccs: tp = "sccs"; break;
X case L_undef: tp = "undef"; break;
X#if DEBUG
X case L_debug: tp = "debug"; break;
X case L_nodebug: tp = "nodebug"; break;
X#endif
X default: hash = L_nogood;
X case L_nogood: tp = ""; break;
X }
X if (!streq(tp, token))
X hash = L_nogood;
X /*
X * hash is set to a unique value corresponding to the
X * control keyword (or L_nogood if we think it's nonsense).
X */
X if (infile->fp == NULL)
X cwarn("Control line \"%s\" within macro expansion", token);
X if (!compiling) { /* Not compiling now */
X switch (hash) {
X case L_if: /* These can't turn */
X case L_ifdef: /* compilation on, but */
X case L_ifndef: /* we must nest #if's */
X if (++ifptr >= &ifstack[BLK_NEST])
X goto if_nest_err;
X *ifptr = 0; /* !WAS_COMPILING */
X case L_line: /* Many */
X /*
X * Are pragma's always processed?
X */
X case L_ident:
X case L_sccs:
X case L_pragma: /* options */
X case L_include: /* are uninteresting */
X case L_define: /* if we */
X case L_undef: /* aren't */
X case L_assert: /* compiling. */
Xdump_line: skipnl(); /* Ignore rest of line */
X return (counter + 1);
X }
X }
X /*
X * Make sure that #line and #pragma are output on a fresh line.
X */
X if (counter > 0 && (hash == L_line || hash == L_pragma)) {
X putchar('\n');
X counter--;
X }
X switch (hash) {
X case L_line:
X /*
X * Parse the line to update the line number and "progname"
X * field and line number for the next input line.
X * Set wrongline to force it out later.
X */
X c = skipws();
X workp = work; /* Save name in work */
X while (c != '\n' && c != EOF_CHAR) {
X save(c);
X c = get();
X }
X unget();
X save(EOS);
X /*
X * Split #line argument into <line-number> and <name>
X * We subtract 1 as we want the number of the next line.
X */
X line = atoi(work) - 1; /* Reset line number */
X for (tp = work; isdigit(*tp) || type[*tp] == SPA; tp++)
X ; /* Skip over digits */
X if (*tp != EOS) { /* Got a filename, so: */
X if (*tp == '"' && (ep = strrchr(tp + 1, '"')) != NULL) {
X tp++; /* Skip over left quote */
X *ep = EOS; /* And ignore right one */
X }
X if (infile->progname != NULL) /* Give up the old name */
X free(infile->progname); /* if it's allocated. */
X infile->progname = savestring(tp);
X }
X wrongline = TRUE; /* Force output later */
X break;
X
X case L_include:
X doinclude();
X break;
X
X case L_define:
X dodefine();
X break;
X
X case L_undef:
X doundef();
X break;
X
X case L_else:
X if (ifptr == &ifstack[0])
X goto nest_err;
X else if ((*ifptr & ELSE_SEEN) != 0)
X goto else_seen_err;
X *ifptr |= ELSE_SEEN;
X if ((*ifptr & WAS_COMPILING) != 0) {
X if (compiling || (*ifptr & TRUE_SEEN) != 0)
X compiling = FALSE;
X else {
X compiling = TRUE;
X }
X }
X break;
X
X case L_elif:
X if (ifptr == &ifstack[0])
X goto nest_err;
X else if ((*ifptr & ELSE_SEEN) != 0) {
Xelse_seen_err: cerror("#%s may not follow #else", token);
X goto dump_line;
X }
X if ((*ifptr & (WAS_COMPILING | TRUE_SEEN)) != WAS_COMPILING) {
X compiling = FALSE; /* Done compiling stuff */
X goto dump_line; /* Skip this clause */
X }
X doif(L_if);
X break;
X
X case L_if:
X case L_ifdef:
X case L_ifndef:
X if (++ifptr >= &ifstack[BLK_NEST])
Xif_nest_err: cfatal("Too many nested #%s statements", token);
X *ifptr = WAS_COMPILING;
X doif(hash);
X break;
X
X case L_endif:
X if (ifptr == &ifstack[0]) {
Xnest_err: cerror("#%s must be in an #if", token);
X goto dump_line;
X }
X if (!compiling && (*ifptr & WAS_COMPILING) != 0)
X wrongline = TRUE;
X compiling = ((*ifptr & WAS_COMPILING) != 0);
X --ifptr;
X break;
X
X case L_assert:
X if (eval() == 0)
X cerror("Preprocessor assertion failure", NULLST);
X break;
X
X case L_ident:
X case L_sccs:
X goto dump_line;
X break;
X
X case L_pragma:
X /*
X * #pragma is provided to pass "options" to later
X * passes of the compiler. cpp doesn't have any yet.
X */
X printf("#pragma ");
X while ((c = get()) != '\n' && c != EOF_CHAR)
X cput(c);
X unget();
X break;
X
X#if DEBUG
X case L_debug:
X if (debug == 0)
X dumpdef("debug set on");
X debug++;
X break;
X
X case L_nodebug:
X debug--;
X break;
X#endif
X
X default:
X /*
X * Undefined #control keyword.
X * Note: the correct behavior may be to warn and
X * pass the line to a subsequent compiler pass.
X * This would allow #asm or similar extensions.
X */
X cerror("Illegal # command \"%s\"", token);
X break;
X }
X if (hash != L_include) {
X#if OLD_PREPROCESSOR || !VERBOSE
X /*
X * Ignore the rest of the #control line so you can write
X * #if foo
X * #endif foo
X */
X goto dump_line; /* Take common exit */
X#else
X if (skipws() != '\n') {
X cwarn("Unexpected text in #control line ignored", NULLST);
X skipnl();
X }
X#endif
X }
X return (counter + 1);
X}
X
XFILE_LOCAL
Xdoif(hash)
Xint hash;
X/*
X * Process an #if, #ifdef, or #ifndef. The latter two are straightforward,
X * while #if needs a subroutine of its own to evaluate the expression.
X *
X * doif() is called only if compiling is TRUE. If false, compilation
X * is always supressed, so we don't need to evaluate anything. This
X * supresses unnecessary warnings.
X */
X{
X register int c;
X register int found;
X
X if ((c = skipws()) == '\n' || c == EOF_CHAR) {
X unget();
X goto badif;
X }
X if (hash == L_if) {
X unget();
X found = (eval() != 0); /* Evaluate expr, != 0 is TRUE */
X hash = L_ifdef; /* #if is now like #ifdef */
X }
X else {
X if (type[c] != LET) /* Next non-blank isn't letter */
X goto badif; /* ... is an error */
X found = (lookid(c) != NULL); /* Look for it in symbol table */
X }
X if (found == (hash == L_ifdef)) {
X compiling = TRUE;
X *ifptr |= TRUE_SEEN;
X }
X else {
X compiling = FALSE;
X }
X return;
X
Xbadif: cerror("#if, #ifdef, or #ifndef without an argument", NULLST);
X#if !OLD_PREPROCESSOR
X skipnl(); /* Prevent an extra */
X unget(); /* Error message */
X#endif
X return;
X}
X
XFILE_LOCAL
Xdoinclude()
X/*
X * Process the #include control line.
X * There are three variations:
X * #include "file" search somewhere relative to the
X * current source file, if not found,
X * treat as #include <file>.
X * #include <file> Search in an implementation-dependent
X * list of places.
X * #include token Expand the token, it must be one of
X * "file" or <file>, process as such.
X *
X * Note: the November 12 draft forbids '>' in the #include <file> format.
X * This restriction is unnecessary and not implemented.
X */
X{
X register int c;
X register int delim;
X#if HOST == SYS_VMS
X char def_filename[NAM$C_MAXRSS + 1];
X#endif
X
X delim = macroid(skipws());
X if (delim != '<' && delim != '"')
X goto incerr;
X if (delim == '<')
X delim = '>';
X workp = work;
X instring = TRUE; /* Accept all characters */
X while ((c = get()) != '\n' && c != delim && c != EOF_CHAR)
X save(c); /* Put it away. */
X skipnl();
X /*
X * The draft is unclear if the following should be done.
X */
X
X while (--workp >= work && (type[*workp] == SPA))
X ; /* Trim blanks from filename */
X
X/*
X * if (*workp != delim)
X * goto incerr;
X */
X *(workp + 1) = EOS; /* Terminate filename */
X instring = FALSE;
X#if HOST == SYS_VMS
X /*
X * Assume the default .h filetype.
X */
X if (!vmsparse(work, ".H", def_filename)) {
X perror(work); /* Oops. */
X goto incerr;
X }
X else if (openinclude(def_filename, (delim == '"')))
X return;
X#else
X if (openinclude(work, (delim == '"')))
X return;
X#endif
X /*
X * No sense continuing if #include file isn't there.
X */
X cfatal("Cannot open include file \"%s\"", work);
X
Xincerr: cerror("#include syntax error", NULLST);
X return;
X}
X
XFILE_LOCAL int
Xopeninclude(filename, searchlocal)
Xchar *filename; /* Input file name */
Xint searchlocal; /* TRUE if #include "file" */
X/*
X * Actually open an include file. This routine is only called from
X * doinclude() above, but was written as a separate subroutine for
X * programmer convenience. It searches the list of directories
X * and actually opens the file, linking it into the list of
X * active files. Returns TRUE if the file was opened, FALSE
X * if openinclude() fails. No error message is printed.
X */
X{
X register char **incptr;
X#if HOST == SYS_VMS
X#if NWORK < (NAM$C_MAXRSS + 1)
X << error, NWORK isn't greater than NAM$C_MAXRSS >>
X#endif
X#endif
X char tmpname[NWORK]; /* Filename work area */
X
X if (searchlocal) {
X /*
X * Look in local directory first
X */
X#if HOST == SYS_UNIX
X /*
X * Try to open filename relative to the directory of the current
X * source file (as opposed to the current directory). (ARF, SCK).
X */
X if (filename[0] != '/'
X && hasdirectory(infile->filename, tmpname))
X strcat(tmpname, filename);
X else {
X strcpy(tmpname, filename);
X }
X#else
X if (!hasdirectory(filename, tmpname)
X && hasdirectory(infile->filename, tmpname))
X strcat(tmpname, filename);
X else {
X strcpy(tmpname, filename);
X }
X#endif
X if (openfile(tmpname))
X return (TRUE);
X }
X /*
X * Look in any directories specified by -I command line
X * arguments, then in the builtin search list.
X */
X for (incptr = incdir; incptr < incend; incptr++) {
X if (strlen(*incptr) + strlen(filename) >= (NWORK - 1))
X cfatal("Filename work buffer overflow", NULLST);
X else {
X#if HOST == SYS_UNIX
X if (filename[0] == '/')
X strcpy(tmpname, filename);
X else {
X sprintf(tmpname, "%s/%s", *incptr, filename);
X }
X#else
X if (!hasdirectory(filename, tmpname))
X sprintf(tmpname, "%s%s", *incptr, filename);
X#endif
X if (openfile(tmpname))
X return (TRUE);
X }
X }
X return (FALSE);
X}
X
XFILE_LOCAL int
Xhasdirectory(source, result)
Xchar *source; /* Directory to examine */
Xchar *result; /* Put directory stuff here */
X/*
X * If a device or directory is found in the source filename string, the
X * node/device/directory part of the string is copied to result and
X * hasdirectory returns TRUE. Else, nothing is copied and it returns FALSE.
X */
X{
X#if HOST == SYS_UNIX
X register char *tp;
X
X if ((tp = strrchr(source, '/')) == NULL)
X return (FALSE);
X else {
X strncpy(result, source, tp - source + 1);
X result[tp - source + 1] = EOS;
X return (TRUE);
X }
X#else
X#if HOST == SYS_VMS
X if (vmsparse(source, NULLST, result)
X && result[0] != EOS)
X return (TRUE);
X else {
X return (FALSE);
X }
X#else
X /*
X * Random DEC operating system (RSX, RT11, RSTS/E)
X */
X register char *tp;
X
X if ((tp = strrchr(source, ']')) == NULL
X && (tp = strrchr(source, ':')) == NULL)
X return (FALSE);
X else {
X strncpy(result, source, tp - source + 1);
X result[tp - source + 1] = EOS;
X return (TRUE);
X }
X#endif
X#endif
X}
X
X#if HOST == SYS_VMS
X
X/*
X * EXP_DEV is set if a device was specified, EXP_DIR if a directory
X * is specified. (Both set indicate a file-logical, but EXP_DEV
X * would be set by itself if you are reading, say, SYS$INPUT:)
X */
X#define DEVDIR (NAM$M_EXP_DEV | NAM$M_EXP_DIR)
X
XFILE_LOCAL int
Xvmsparse(source, defstring, result)
Xchar *source;
Xchar *defstring; /* non-NULL -> default string. */
Xchar *result; /* Size is at least NAM$C_MAXRSS + 1 */
X/*
X * Parse the source string, applying the default (properly, using
X * the system parse routine), storing it in result.
X * TRUE if it parsed, FALSE on error.
X *
X * If defstring is NULL, there are no defaults and result gets
X * (just) the node::[directory] part of the string (possibly "")
X */
X{
X struct FAB fab = cc$rms_fab; /* File access block */
X struct NAM nam = cc$rms_nam; /* File name block */
X char fullname[NAM$C_MAXRSS + 1];
X register char *rp; /* Result pointer */
X
X fab.fab$l_nam = &nam; /* fab -> nam */
X fab.fab$l_fna = source; /* Source filename */
X fab.fab$b_fns = strlen(source); /* Size of source */
X fab.fab$l_dna = defstring; /* Default string */
X if (defstring != NULLST)
X fab.fab$b_dns = strlen(defstring); /* Size of default */
X nam.nam$l_esa = fullname; /* Expanded filename */
X nam.nam$b_ess = NAM$C_MAXRSS; /* Expanded name size */
X if (sys$parse(&fab) == RMS$_NORMAL) { /* Parse away */
X fullname[nam.nam$b_esl] = EOS; /* Terminate string */
X result[0] = EOS; /* Just in case */
X rp = &result[0];
X /*
X * Remove stuff added implicitly, accepting node names and
X * dev:[directory] strings (but not process-permanent files).
X */
X if ((nam.nam$l_fnb & NAM$M_PPF) == 0) {
X if ((nam.nam$l_fnb & NAM$M_NODE) != 0) {
X strncpy(result, nam.nam$l_node, nam.nam$b_node);
X rp += nam.nam$b_node;
X *rp = EOS;
X }
X if ((nam.nam$l_fnb & DEVDIR) == DEVDIR) {
X strncpy(rp, nam.nam$l_dev, nam.nam$b_dev + nam.nam$b_dir);
X rp += nam.nam$b_dev + nam.nam$b_dir;
X *rp = EOS;
X }
X }
X if (defstring != NULLST) {
X strncpy(rp, nam.nam$l_name, nam.nam$b_name + nam.nam$b_type);
X rp += nam.nam$b_name + nam.nam$b_type;
X *rp = EOS;
X if ((nam.nam$l_fnb & NAM$M_EXP_VER) != 0) {
X strncpy(rp, nam.nam$l_ver, nam.nam$b_ver);
X rp[nam.nam$b_ver] = EOS;
X }
X }
X return (TRUE);
X }
X return (FALSE);
X}
X#endif
X
END-of-cpp2.c
exit
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