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From: decvax!minow Date: Tue, 8 Jan 85 00:05:20 est Subject: cpp1.arc -h- readme.txt Mon Jan 7 23:59:27 1985 readme.txt Decus cpp is a public-domain implementation of the C preprocessor. It runs on VMS native (Vax C), VMS compatibilty mode (Decus C), RSX-11M, RSTS/E, P/OS, and RT11, as well as on several varieties of Unix, including Ultrix. Decus cpp attempts to implement features in the Draft ANSI Standard for the C language. It should be noted, however, that this standard is under active development: the current draft of the standard explicitly states that "readers are requested not to specify or claim conformance to this draft." Thus readers and users of Decus cpp should not assume that it conforms to the draft standard, or that it will conform to the actual C language standard. These notes describe how to extract the cpp source files, configure it for your needs, and mention a few design decisions that may be of interest to maintainers. Installation Because the primary development of cpp was not on Unix, it is distributed using the Decus C archive program (quite similar to the archiver published in Kernighan and Plauger's Software Tools). To extract the files from the net.sources distribution, save this message as cpp1.arc and the other two distribution files as cpp2.arc and cpp3.arc. Then, using your favorite editor, locate the archx.c program, just following the line beginning with "-h- archx.c" -- the format of the distribution is just: -h- readme.txt ... this file -h- cpp.mem ... description of cpp -h- archx.c ... archx.c program -- extracts archives -h- archc.c ... archc.c program -- creates archives Compile archx.c -- it shouldn't require any special editing. Then run it as follows: archx *.arc You do not need to remove mail headers from the saved messages. You should then read through cppdef.h to make sure the HOST and TARGET (and other implementation-specific) definitions are set correctly for your machine, editing them as needed. You may then copy makefile.txt to Makefile, editing it as needed for your particular system. On Unix, cpp should be compiled by make without further difficulty. On other operating systems, you should compile the six source modules, linking them together. Note that, on Decus C based systems, you must extend the default stack allocation. The Decus C build utility will create the appropriate command file. Support Notes The USENET distribution kit was designed to keep all submissions around 50,000 bytes: cpp1.arc: readme.txt This file cpp.mem Documentation page (see below) archx.c Archive extraction program archc.c Archive construction program cpp.rno Source for cpp.mem (see below) makefile.txt Unix makefile -- copy to Makefile cpp.h Main header file (structure def's and globals) cppdef.h Configuration file (host and target definitions) cpp2.arc: cpp1.c Mainline code, documentation master sources cpp2.c most #control processing cpp3.c filename stuff and command line parsing cpp3.arc: cpp4.c #define processor cpp5.c #if <expr> processor cpp6.c Support code (symbol table and I/O routines) Cpp intentionally does not rely on the presence of a full-scale macro preprocessor, it does require the simple parameter substitution preprocessor capabilities of Unix V6 and Decus C. If your C language lacks full preprocessing, you should make sure "nomacargs" is #define'd in cpp.h. (This is done automatically by the Decus C compiler.) The documentation (manual page) for cpp is included as cpp.mem and cpp.rno. Cpp.rno is in Dec Runoff format, built by a Decus C utility (getrno) from original source which is embedded in cpp1.c. To my knowledge, there is no equivalent program that creates the nroff source appropriate for Unix. I would be happy to receive fixes to any problems you encounter. As I do not maintain distribution kit base-levels, bare-bones diff listings without sufficient context are not very useful. It is unlikely that I can find time to help you with other difficulties. Acknowledgements I received a great deal of help from many people in debugging cpp. Alan Feuer and Sam Kendall used "state of the art" run-time code checkers to locate several errors. Ed Keiser found problems when cpp was used on machines with different int and pointer sizes. Dave Conroy helped with the initial debugging, while Arthur Olsen and George Rosenberg found (and solved) several problems in the first USENET release. Martin Minow decvax!minow -h- cpp.mem Mon Jan 7 23:59:27 1985 cpp.mem 1.0 C Pre-Processor ******* * cpp * ******* NAME: cpp -- C Pre-Processor SYNOPSIS: cpp [-options] [infile [outfile]] 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. -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. -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. -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. Page 2 cpp C Pre-Processor -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. -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. -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. -Uname Undefine the name as if #undef name were given. On non-Unix systems, "name" will be forced to upper-case. Page 3 cpp C Pre-Processor -Xnumber Enable debugging code. If no value is given, a value of 1 will be used. (For maintenence of CPP only.) PRE-DEFINED VARIABLES: When CPP begins processing, the following variables will have been defined (unless the -N option is specified): Target computer (as appropriate): pdp11, vax, M68000 m68000 m68k Target operating system (as appropriate): rsx, rt11, vms, unix Target compiler (as appropriate): decus, vax11c The implementor may add definitions to this list. The default definitions match the definition of the host computer, operating system, and C compiler. The following are always available unless undefined (or -N was specified twice): __FILE__ The input (or #include) file being compiled (as a quoted string). __LINE__ The line number being compiled. __DATE__ The date and time of compilation as a Unix ctime quoted string (the trailing newline is removed). Thus, printf("Bug at line %s,", __LINE__); printf(" source file %s", __FILE__); printf(" compiled on %s", __DATE__); 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 Page 4 cpp C Pre-Processor 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. 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: #elif expression (#else #if) '\xNNN' (Hexadecimal constant) '\a' (Ascii BELL) '\v' (Ascii Vertical Tab) #if defined NAME 1 if defined, 0 if not #if defined (NAME) 1 if defined, 0 if not #if sizeof (basic type) unary + 123U, 123LU Unsigned ints and longs. 12.3L Long double numbers token#token Token concatenation #include token Expands to filename 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 Page 5 cpp C Pre-Processor 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. Expand T3 if it is a macro. A macro formal parameter will be substituted into a string or character constant if it is the only component of that constant: #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. As implemented here, if you write #define string(arg) "arg" ... string("foo") ... This implementation generates "foo", rather than the strictly correct ""foo"" (which will probably generate an error message). This is, strictly speaking, an error in CPP and may be removed from future releases. 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. -h- archx.c Mon Jan 7 23:59:27 1985 archx.c /* * A R C H X * * Archive extraction * */ /*)BUILD $(TKBOPTIONS) = { TASK = ...ARX } */ #ifdef DOCUMENTATION title archx text file archiver extraction index text file archiver extraction synopsis arch archive_files description Archx manages archives (libraries) of source files, allowing a large number of small files to be stored without using excessive system resources. Archx extracts all files from an archive. If no archive_name file is given, the standard input is read. Archive header records are echoed to the standard output. archive file format Archive files are standard text files. Each archive element is preceeded by a line of the format: .s.nf -h- file.name date true_name .s.f Note that there is no line or byte count. To prevent problems, a '-' at the beginning of a record within a user file or embedded archive will be "quoted" by doubling it. The date and true filename fields are ignored. On some operating systems, file.name is forced to lowercase. If the first non-blank line of an input file does not begin with "-h", the text will be appended to "archx.tmp" This is needed if archives are distributed by mail and arrive with initial routing and subject information. diagnostics Diagnostic messages should be self-explanatory author Martin Minow bugs #endif #include <stdio.h> #include <ctype.h> #define EOS 0 #define FALSE 0 #define TRUE 1 #ifdef vms #include <ssdef.h> extern int errno; #define IO_ERROR errno #define IO_NORMAL SS$_NORMAL #endif #ifndef IO_NORMAL #define IO_NORMAL 0 #endif #ifndef IO_ERROR #define IO_ERROR 1 #endif /* * The following status codes are returned by gethdr() */ #define DONE 0 #define GOTCHA 1 #define NOGOOD 2 char text[513]; /* Working text line */ char name[81]; /* Current archive member name */ char filename[81]; /* Working file name */ char arfilename[81]; /* Archive file name */ char fullname[81]; /* Output for argetname() */ int verbose = TRUE; /* TRUE for verbosity */ int first_archive; /* For mail header skipping */ main(argc, argv) int argc; /* Arg count */ char *argv[]; /* Arg vector */ { register int i; /* Random counter */ int status; /* Exit status */ #ifdef vms argc = getredirection(argc, argv); #endif status = IO_NORMAL; if (argc == 1) process(); else { for (i = 1; i < argc; i++) { if (freopen(argv[i], "r", stdin) != NULL) process(); else { perror(argv[i]); status = IO_ERROR; } } } exit(status); } process() /* * Process archive open on stdin */ { register char *fn; /* File name pointer */ register FILE *outfd; register int i; text[0] = EOS; while ((i = gethdr()) != DONE) { switch (i) { case GOTCHA: if ((outfd = fopen(name, "w")) == NULL) { perror(name); fprintf(stderr, "Can't create \"%s\"\n", name); arskip(); continue; } break; case NOGOOD: fprintf(stderr, "Missing -h-, writing to archx.tmp\n"); fprintf(stderr, "Current text line: %s", text); strcpy(name, "archx.tmp"); if ((outfd = fopen(name, "a")) == NULL) { perror(name); fprintf(stderr, "Cannot append to %s\n", name); arskip(); continue; } break; } arexport(outfd); fclose(outfd); } } int gethdr() /* * If text is null, read a record, returning to signal input state: * DONE Eof read * NOGOOD -h- wasn't first non-blank line. Line is in text[] * GOTCHA -h- found, parsed into name. */ { register char *tp; register char *np; again: if (text[0] == EOS && fgets(text, sizeof text, stdin) == NULL) return (DONE); if (text[0] == '\n' && text[1] == EOS) { text[0] = EOS; goto again; } if (text[0] != '-' || text[1] != 'h' || text[2] != '-') return (NOGOOD); for (tp = &text[3]; isspace(*tp); tp++) ; for (np = name; !isspace(*tp); *np++ = *tp++) ; *np = EOS; return (GOTCHA); } arskip() /* * Skip to next header */ { while (fgets(text, sizeof text, stdin) != NULL) { if (text[0] == '-' && text[1] != '-') return; } text[0] = EOS; /* EOF signal */ } arexport(outfd) register FILE *outfd; /* * Read secret archive format, writing archived data to outfd. * Clean out extraneous <cr>,<lf>'s */ { register char *tp; unsigned int nrecords; printf("Creating \"%s\", ", name); nrecords = 0; while (fgets(text, sizeof text, stdin) != NULL) { tp = &text[strlen(text)]; if (tp > &text[1] && *--tp == '\n' && *--tp == '\r') { *tp++ = '\n'; *tp = EOS; } if (text[0] == '-') { if (text[1] != '-') goto gotcha; fputs(text+1, outfd); } else { fputs(text, outfd); } nrecords++; } text[0] = EOS; gotcha: printf("%u records\n", nrecords); if (ferror(stdin) || ferror(outfd)) printf("Creation of \"%s\" completed with error\n", name); } /* * getredirection() is intended to aid in porting C programs * to VMS (Vax-11 C) which does not support '>' and '<' * I/O redirection. With suitable modification, it may * useful for other portability problems as well. */ #ifdef vms static int getredirection(argc, argv) int argc; char **argv; /* * Process vms redirection arg's. Exit if any error is seen. * If getredirection() processes an argument, it is erased * from the vector. getredirection() returns a new argc value. * * Warning: do not try to simplify the code for vms. The code * presupposes that getredirection() is called before any data is * read from stdin or written to stdout. * * Normal usage is as follows: * * main(argc, argv) * int argc; * char *argv[]; * { * argc = getredirection(argc, argv); * } */ { register char *ap; /* Argument pointer */ int i; /* argv[] index */ int j; /* Output index */ int file; /* File_descriptor */ extern int errno; /* Last vms i/o error */ for (j = i = 1; i < argc; i++) { /* Do all arguments */ switch (*(ap = argv[i])) { case '<': /* <file */ if (freopen(++ap, "r", stdin) == NULL) { perror(ap); /* Can't find file */ exit(errno); /* Is a fatal error */ } case '>': /* >file or >>file */ if (*++ap == '>') { /* >>file */ /* * If the file exists, and is writable by us, * call freopen to append to the file (using the * file's current attributes). Otherwise, create * a new file with "vanilla" attributes as if * the argument was given as ">filename". * access(name, 2) is TRUE if we can write on * the specified file. */ if (access(++ap, 2) == 0) { if (freopen(ap, "a", stdout) != NULL) break; /* Exit case statement */ perror(ap); /* Error, can't append */ exit(errno); /* After access test */ } /* If file accessable */ } /* * On vms, we want to create the file using "standard" * record attributes. create(...) creates the file * using the caller's default protection mask and * "variable length, implied carriage return" * attributes. dup2() associates the file with stdout. */ if ((file = creat(ap, 0, "rat=cr", "rfm=var")) == -1 || dup2(file, fileno(stdout)) == -1) { perror(ap); /* Can't create file */ exit(errno); /* is a fatal error */ } /* If '>' creation */ break; /* Exit case test */ default: argv[j++] = ap; /* Not a redirector */ break; /* Exit case test */ } } /* For all arguments */ return (j); } #endif -h- archc.c Mon Jan 7 23:59:27 1985 archc.c /* * A R C H I V E * * Create an archive * */ /*)BUILD $(TKBOPTIONS) = { TASK = ...ARC } */ #ifdef DOCUMENTATION title archc text file archive creation index text file archive creation synopsis archc file[s] >archive description Archc manages archives (libraries) of source files, allowing a large number of small files to be stored without using excessive system resources. It copies the set of named files to standard output in archive format. The archx program will recreate the files from an archive. Note: there are no checks against the same file appearing twice in an archive. archive file format Archive files are standard text files. Each archive element is preceeded by a line of the format: .s.nf -h- file.name date true_path_name .s.f Note that there is no line or byte count. To prevent problems, a '-' at the beginning of a record within a user file or embedded archive will be "quoted" by doubling it. The date and true filename fields are ignored. On Dec operating systems, file.name is forced to lowercase. diagnostics Diagnostic messages should be self-explanatory author Martin Minow #endif #include <stdio.h> #include <ctype.h> #define EOS 0 #define FALSE 0 #define TRUE 1 char text[513]; /* Working text */ char name[81]; /* Current archive member name */ char pathname[81]; /* Output for argetname() */ char *timetext; /* Time of day text */ int verbose = TRUE; /* TRUE for verbosity */ FILE *infd; /* Input file */ main(argc, argv) int argc; /* Arg count */ char *argv[]; /* Arg vector */ { register int i; /* Random counter */ register char *fn; /* File name pointer */ register char *argp; /* Arg pointer */ int nfiles; extern char *ctime(); extern long time(); long timval; time(&timval); timetext = ctime(&timval); timetext[24] = EOS; argc = getredirection(argc, argv); if (argc <= 1) fprintf(stderr, "No files to archive?\n"); #ifdef unix for (i = 1; i < argc; i++) { if ((infd = fopen(argv[i], "r")) == NULL) perror(argv[i]); else { strcpy(pathname, argv[i]); import(); fclose(infd); } } #else for (i = 1; i < argc; i++) { if ((infd = fwild(argv[i], "r")) == NULL) perror(argv[i]); else { for (nfiles = 0; fnext(infd) != NULL; nfiles++) { fgetname(infd, pathname); import(); } fclose(infd); if (nfiles == 0) fprintf(stderr, "No files match \"%s\"\n", argv[i]); } } #endif } import() /* * Add the file open on infd (with file name in pathname) to * the archive. */ { unsigned int nrecords; fixname(); nrecords = 0; printf("-h- %s\t%s\t%s\n", name, timetext, pathname); while (fgets(text, sizeof text, infd) != NULL) { if (text[0] == '-') putchar('-'); /* Quote */ fputs(text, stdout); nrecords++; } if (ferror(infd)) { perror(name); fprintf(stderr, "Error when importing a file\n"); } if (verbose) { fprintf(stderr, "%u records read from %s\n", nrecords, pathname); } } fixname() /* * Get file name (in pathname), stripping off device:[directory] * and ;version. The archive name ("file.ext") is written to name[]. * On a dec operating system, name is forced to lowercase. */ { register char *tp; register char *ip; char bracket; extern char *strrchr(); #ifdef unix /* * name is after all directory information */ if ((tp = strrchr(pathname, '/')) != NULL) tp++; else tp = pathname; strcpy(name, tp); #else strcpy(name, pathname); if ((tp = strrchr(name, ';')) != NULL) *tp = EOS; while ((tp = strchr(name, ':')) != NULL) strcpy(name, tp + 1); switch (name[0]) { case '[': bracket = ']'; break; case '<': bracket = '>'; break; case '(': bracket = ')'; break; default: bracket = EOS; break; } if (bracket != EOS) { if ((tp = strchr(name, bracket)) == NULL) { fprintf(stderr, "? Illegal file name \"%s\"\n", pathname); } else { strcpy(name, tp + 1); } } for (tp = name; *tp != EOS; tp++) { if (isupper(*tp)) *tp = tolower(*tp); } #endif } #ifdef unix char * strrchr(stng, chr) register char *stng; register char chr; /* * Return rightmost instance of chr in stng. * This has the wrong name on some Unix systems. */ { register char *result; result = NULL; do { if (*stng == chr) result = stng; } while (*stng++ != EOS); return (result); } #endif /* * getredirection() is intended to aid in porting C programs * to VMS (Vax-11 C) which does not support '>' and '<' * I/O redirection. With suitable modification, it may * useful for other portability problems as well. */ static int getredirection(argc, argv) int argc; char **argv; /* * Process vms redirection arg's. Exit if any error is seen. * If getredirection() processes an argument, it is erased * from the vector. getredirection() returns a new argc value. * * Warning: do not try to simplify the code for vms. The code * presupposes that getredirection() is called before any data is * read from stdin or written to stdout. * * Normal usage is as follows: * * main(argc, argv) * int argc; * char *argv[]; * { * argc = getredirection(argc, argv); * } */ { #ifdef vms register char *ap; /* Argument pointer */ int i; /* argv[] index */ int j; /* Output index */ int file; /* File_descriptor */ extern int errno; /* Last vms i/o error */ for (j = i = 1; i < argc; i++) { /* Do all arguments */ switch (*(ap = argv[i])) { case '<': /* <file */ if (freopen(++ap, "r", stdin) == NULL) { perror(ap); /* Can't find file */ exit(errno); /* Is a fatal error */ } case '>': /* >file or >>file */ if (*++ap == '>') { /* >>file */ /* * If the file exists, and is writable by us, * call freopen to append to the file (using the * file's current attributes). Otherwise, create * a new file with "vanilla" attributes as if * the argument was given as ">filename". * access(name, 2) is TRUE if we can write on * the specified file. */ if (access(++ap, 2) == 0) { if (freopen(ap, "a", stdout) != NULL) break; /* Exit case statement */ perror(ap); /* Error, can't append */ exit(errno); /* After access test */ } /* If file accessable */ } /* * On vms, we want to create the file using "standard" * record attributes. create(...) creates the file * using the caller's default protection mask and * "variable length, implied carriage return" * attributes. dup2() associates the file with stdout. */ if ((file = creat(ap, 0, "rat=cr", "rfm=var")) == -1 || dup2(file, fileno(stdout)) == -1) { perror(ap); /* Can't create file */ exit(errno); /* is a fatal error */ } /* If '>' creation */ break; /* Exit case test */ default: argv[j++] = ap; /* Not a redirector */ break; /* Exit case test */ } } /* For all arguments */ return (j); #else /* * Note: argv[] is referenced to fool the Decus C * syntax analyser, supressing an unneeded warning * message. */ return (argv[0], argc); /* Just return as seen */ #endif } -h- cpp.rno Mon Jan 7 23:59:27 1985 cpp.rno .lm 8.rm 72.nhy .no autosubtitle .style headers 3,0,0 .pg.uc.ps 58,80.lm 8.rm 72 .hd .hd mixed .head mixed .st ########cpp#####C Pre-Processor .pg .hl 1 ^&C Pre-Processor\& .s 2 .c ;******* .c ;* cpp * .c ;******* .s 2 .lm +8 .s.i -8;NAME: cpp -- C Pre-Processor .s.f .i -8;SYNOPSIS: .s.nf cpp [-options] [infile [outfile]] .s.f .i -8;DESCRIPTION: .s 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. .s 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 .s .nf _#define name value .s .fill at the start of the first file. If "=value" is not given, a value of "1" will be used. .s 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 --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: .s .nf char short int long float double .s .fill 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 (*)()) .s For example, to specify sizes appropriate for a PDP-11, you would write: .s .nf c s i l f d func -S1,2,2,2,4,8, -S*2,2,2,2,2,2,2 .s .fill Note that all values must be specified. .p -16 --Uname Undefine the name as if .s .nf _#undef name .s .fill 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 .s .i -8;PRE-DEFINED VARIABLES: .s When CPP begins processing, the following variables will have been defined (unless the -N option is specified): .s Target computer (as appropriate): .s .nf pdp11, vax, M68000 m68000 m68k .fill .s Target operating system (as appropriate): .s .nf rsx, rt11, vms, unix .fill .s Target compiler (as appropriate): .s .nf decus, vax11c .fill .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 .nf printf("Bug at line _%s,", ____LINE____); printf(" source file _%s", ____FILE____); printf(" compiled on _%s", ____DATE____); .fill .s.lm -16 .s .i -8;DRAFT PROPOSED ANSI STANDARD CONSIDERATIONS: .s 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. .s 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. .s The latest version of the Draft Proposed Standard (as reflected in Decus CPP) is dated November 12, 1984. .s 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. .s The '$' character is considered to be a letter. This is a permitted extension. .s 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_#token Token concatenation .br;####_#include token Expands to filename .s The Draft Proposed Standard has extended C, adding a constant string concatenation operator, where .s .nf "foo" "bar" .s .fill 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.) .s 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: .s .nf _#line 123 _#define ATLINE foo_#____LINE____ .s .fill ATLINE would be defined as foo123. .s Note that "Token2" must either have the format of an identifier or be a string of digits. Thus, the string .s .nf _#define ATLINE foo_#1x3 .s .fill generates two tokens: "foo1" and "x3". .s If the tokens T1 and T2 are concatenated into T3, this implementation operates as follows: .s .nf 1. Expand T1 if it is a macro. 2. Expand T2 if it is a macro. 3. Join the tokens, forming T3. 4. Expand T3 if it is a macro. .s .fill A macro formal parameter will be substituted into a string or character constant if it is the only component of that constant: .s .nf _#define VECSIZE 123 _#define vprint(name, size) _\ printf("name" "[" "size" "] = {_\n") ... vprint(vector, VECSIZE); .s .fill expands (effectively) to .s .nf vprint("vector[123] = {_\n"); .s .fill Note that this will be useful if your C compiler supports the new string concatenation operation noted above. As implemented here, if you write .s .nf _#define string(arg) "arg" ... string("foo") ... .s .fill This implementation generates "foo", rather than the strictly correct ""foo"" (which will probably generate an error message). This is, strictly speaking, an error in CPP and may be removed from future releases. .s .i -8;ERROR MESSAGES: .s 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. .s .i -8;AUTHOR: .s Martin Minow .s .i -8;BUGS: .s The _#if expression processor uses signed integers only. I.e, _#if 0xFFFFu < 0 may be TRUE. .s .lm 8.rm 72.nhy -h- makefile.txt Mon Jan 7 23:59:27 1985 makefile.txt # Unix makefile for cpp # # The redefinition of strchr() and strrchr() are needed for # Ultrix-32, Unix 4.2 bsd (and maybe some other Unices). # BSDDEFINE = -Dstrchr=index -Dstrrchr=rindex # # On certain systems, such as Unix System III, you may need to define # $(LINTFLAGS) in the make command line to set system-specific lint flags. # # This Makefile assumes cpp will replace the "standard" preprocessor. # Delete the reference to -DLINE_PREFIX=\"\" if cpp is used stand-alone. # LINEFIX is a sed script filter that reinserts #line -- used for testing # if LINE_PREFIX is set to "". Note that we must stand on our heads to # match the # and a line had better not begin with $. By the way, what # we really want is # LINEFIX = | sed "s/^#/#line/" # CPPDEFINE = -DLINE_PREFIX=\"\" LINEFIX = | sed "s/^[^ !\"%-~]/&line/" # # Define OLD_PREPROCESSOR non-zero to make a preprocessor which is # "as compatible as possible" with the standard Unix V7 or Ultrix # preprocessors. This is needed to rebuild 4.2bsd, for example, as # the preprocessor is used to modify assembler code, rather than C. # This is not recommended for current development. OLD_PREPROCESSOR # forces the following definitions: # OK_DOLLAR FALSE $ is not allowed in variables # OK_CONCAT FALSE # cannot concatenate tokens # COMMENT_INVISIBLE TRUE old-style comment concatenation # STRING_FORMAL TRUE old-style string expansion # OLDDEFINE = -DOLD_PREPROCESSOR=1 # # DEFINES collects all -D arguments for cc and lint: # Change DEFINES = $(BSDDEFINE) $(CPPDEFINE) $(OLDDEFINE) # for an old-style preprocessor. # DEFINES = $(BSDDEFINE) $(CPPDEFINE) CFLAGS = -O $(DEFINES) # # ** compile cpp # SRCS = cpp1.c cpp2.c cpp3.c cpp4.c cpp5.c cpp6.c OBJS = cpp1.o cpp2.o cpp3.o cpp4.o cpp5.o cpp6.o cpp: $(OBJS) $(CC) $(CFLAGS) $(OBJS) -o cpp # # ** Test cpp by preprocessing itself, compiling the result, # ** repeating the process and diff'ing the result. Note: this # ** is not a good test of cpp, but a simple verification. # ** The diff's should not report any changes. # ** Note that a sed script may be executed for each compile # test: cpp cpp1.c $(LINEFIX) >old.tmp1.c cpp cpp2.c $(LINEFIX) >old.tmp2.c cpp cpp3.c $(LINEFIX) >old.tmp3.c cpp cpp4.c $(LINEFIX) >old.tmp4.c cpp cpp5.c $(LINEFIX) >old.tmp5.c cpp cpp6.c $(LINEFIX) >old.tmp6.c $(CC) $(CFLAGS) old.tmp[123456].c a.out cpp1.c >new.tmp1.c a.out cpp2.c >new.tmp2.c a.out cpp3.c >new.tmp3.c a.out cpp4.c >new.tmp4.c a.out cpp5.c >new.tmp5.c a.out cpp6.c >new.tmp6.c diff old.tmp1.c new.tmp1.c diff old.tmp2.c new.tmp2.c diff old.tmp3.c new.tmp3.c diff old.tmp4.c new.tmp4.c diff old.tmp5.c new.tmp5.c diff old.tmp6.c new.tmp6.c rm a.out old.tmp[123456].* new.tmp[123456].* # # A somewhat more extensive test is provided by the "clock" # program (which is not distributed). Substitute your favorite # macro-rich program here. # clock: clock.c cpp cpp clock.c $(LINEFIX) >temp.cpp.c cc temp.cpp.c -lcurses -ltermcap -o clock rm temp.cpp.c # # ** Lint the code # lint: $(SRCS) lint $(LINTFLAGS) $(DEFINES) $(SRCS) # # ** Remove unneeded files # clean: rm -f $(OBJS) cpp # # ** Rebuild the archive files needed to distribute cpp # ** Uses the Decus C archive utility. # archc: archc.c $(CC) $(CFLAGS) archc.c -o archc archx: archx.c $(CC) $(CFLAGS) archx.c -o archx archive: archc archc readme.txt cpp.mem archx.c archc.c cpp.rno makefile.txt \ cpp*.h >cpp1.arc archc cpp1.c cpp2.c cpp3.c >cpp2.arc archc cpp4.c cpp5.c cpp6.c >cpp3.arc # # Object module dependencies # cpp1.o : cpp1.c cpp.h cppdef.h cpp2.o : cpp2.c cpp.h cppdef.h cpp3.o : cpp3.c cpp.h cppdef.h cpp4.o : cpp4.c cpp.h cppdef.h cpp5.o : cpp5.c cpp.h cppdef.h cpp6.o : cpp6.c cpp.h cppdef.h -h- cpp.h Mon Jan 7 23:59:27 1985 cpp.h /* * 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 * * In general, definitions in this file should not be changed. */ #ifndef TRUE #define TRUE 1 #define FALSE 0 #endif #ifndef EOS /* * This is predefined in Decus C */ #define EOS '\0' /* End of string */ #endif #define EOF_CHAR 0 /* Returned by get() on eof */ #define NULLST ((char *) NULL) /* Pointer to nowhere (linted) */ #define DEF_NOARGS (-1) /* #define foo vs #define foo() */ /* * The following may need to change if the host system doesn't use ASCII. */ #define DEF_MAGIC 0x1D /* Magic for #defines */ #define TOK_SEP 0x1E /* Token concatenation delim. */ #define COM_SEP 0x1F /* Magic comment separator */ /* * Note -- in Ascii, the following will map macro formals onto DEL + the * C1 control character region (decimal 128 .. (128 + PAR_MAC)) which will * be ok as long as PAR_MAC is less than 33). Note that the last PAR_MAC * value is reserved for string substitution. */ #define MAC_PARM 0x7F /* Macro formals start here */ #if PAR_MAC >= 33 assertion fails -- PAR_MAC isn't less than 33 #endif #define LASTPARM (PAR_MAC - 1) /* * Character type codes. */ #define INV 0 /* Invalid, must be zero */ #define OP_EOE INV /* End of expression */ #define DIG 1 /* Digit */ #define LET 2 /* Identifier start */ #define FIRST_BINOP OP_ADD #define OP_ADD 3 #define OP_SUB 4 #define OP_MUL 5 #define OP_DIV 6 #define OP_MOD 7 #define OP_ASL 8 #define OP_ASR 9 #define OP_AND 10 /* &, not && */ #define OP_OR 11 /* |, not || */ #define OP_XOR 12 #define OP_EQ 13 #define OP_NE 14 #define OP_LT 15 #define OP_LE 16 #define OP_GE 17 #define OP_GT 18 #define OP_ANA 19 /* && */ #define OP_ORO 20 /* || */ #define OP_QUE 21 /* ? */ #define OP_COL 22 /* : */ #define OP_CMA 23 /* , (relevant?) */ #define LAST_BINOP OP_CMA /* Last binary operand */ /* * The following are unary. */ #define FIRST_UNOP OP_PLU /* First Unary operand */ #define OP_PLU 24 /* + (draft ANSI standard) */ #define OP_NEG 25 /* - */ #define OP_COM 26 /* ~ */ #define OP_NOT 27 /* ! */ #define LAST_UNOP OP_NOT #define OP_LPA 28 /* ( */ #define OP_RPA 29 /* ) */ #define OP_END 30 /* End of expression marker */ #define OP_MAX (OP_END + 1) /* Number of operators */ #define OP_FAIL (OP_END + 1) /* For error returns */ /* * The following are for lexical scanning only. */ #define QUO 65 /* Both flavors of quotation */ #define DOT 66 /* . might start a number */ #define SPA 67 /* Space and tab */ #define BSH 68 /* Just a backslash */ #define END 69 /* EOF */ /* * These bits are set in ifstack[] */ #define WAS_COMPILING 1 /* TRUE if compile set at entry */ #define ELSE_SEEN 2 /* TRUE when #else processed */ #define TRUE_SEEN 4 /* TRUE when #if TRUE processed */ /* * Define bits for the basic types and their adjectives */ #define T_CHAR 1 #define T_INT 2 #define T_FLOAT 4 #define T_DOUBLE 8 #define T_SHORT 16 #define T_LONG 32 #define T_SIGNED 64 #define T_UNSIGNED 128 #define T_PTR 256 /* Pointer */ #define T_FPTR 512 /* Pointer to functions */ /* * The DEFBUF structure stores information about #defined * macros. Note that the defbuf->repl information is always * in malloc storage. */ typedef struct defbuf { struct defbuf *link; /* Next define in chain */ char *repl; /* -> replacement */ int hash; /* Symbol table hash */ int nargs; /* For define(args) */ char name[1]; /* #define name */ } DEFBUF; /* * The FILEINFO structure stores information about open files * and macros being expanded. */ typedef struct fileinfo { char *bptr; /* Buffer pointer */ int line; /* for include or macro */ FILE *fp; /* File if non-null */ struct fileinfo *parent; /* Link to includer */ char *filename; /* File/macro name */ char *progname; /* From #line statement */ unsigned int unrecur; /* For macro recursion */ char buffer[1]; /* current input line */ } FILEINFO; /* * The SIZES structure is used to store the values for #if sizeof */ typedef struct sizes { short bits; /* If this bit is set, */ short size; /* this is the datum size value */ short psize; /* this is the pointer size */ } SIZES; /* * nomacarg is a built-in #define on Decus C. */ #ifdef nomacarg #define cput output /* cput concatenates tokens */ #else #if COMMENT_INVISIBLE #define cput(c) { if (c != TOK_SEP && c != COM_SEP) putchar(c); } #else #define cput(c) { if (c != TOK_SEP) putchar(c); } #endif #endif #ifndef nomacarg #define streq(s1, s2) (strcmp(s1, s2) == 0) #endif /* * Error codes. VMS uses system definitions. * Decus C codes are defined in stdio.h. * Others are cooked to order. */ #if HOST == SYS_VMS #include <ssdef.h> #include <stsdef.h> #define IO_NORMAL (SS$_NORMAL | STS$M_INHIB_MSG) #define IO_ERROR SS$_ABORT #endif /* * Note: IO_NORMAL and IO_ERROR are defined in the Decus C stdio.h file */ #ifndef IO_NORMAL #define IO_NORMAL 0 #endif #ifndef IO_ERROR #define IO_ERROR 1 #endif /* * Externs */ extern int line; /* Current line number */ extern int wrongline; /* Force #line to cc pass 1 */ extern char type[]; /* Character classifier */ extern char token[IDMAX + 1]; /* Current input token */ extern int instring; /* TRUE if scanning string */ extern int inmacro; /* TRUE if scanning #define */ extern int errors; /* Error counter */ extern int recursion; /* Macro depth counter */ extern char ifstack[BLK_NEST]; /* #if information */ #define compiling ifstack[0] extern char *ifptr; /* -> current ifstack item */ extern char *incdir[NINCLUDE]; /* -i directories */ extern char **incend; /* -> active end of incdir */ extern int cflag; /* -C option (keep comments) */ extern int eflag; /* -E option (ignore errors) */ extern int nflag; /* -N option (no pre-defines) */ extern int rec_recover; /* unwind recursive macros */ extern char *preset[]; /* Standard predefined symbols */ extern char *magic[]; /* Magic predefined symbols */ extern FILEINFO *infile; /* Current input file */ extern char work[NWORK + 1]; /* #define scratch */ extern char *workp; /* Free space in work */ #if DEBUG extern int debug; /* Debug level */ #endif extern int keepcomments; /* Don't remove comments if set */ extern SIZES size_table[]; /* For #if sizeof sizes */ extern char *getmem(); /* Get memory or die. */ extern DEFBUF *lookid(); /* Look for a #define'd thing */ extern DEFBUF *defendel(); /* Symbol table enter/delete */ extern char *savestring(); /* Stuff string in malloc mem. */ extern char *strcpy(); extern char *strcat(); extern char *strrchr(); extern char *strchr(); extern long time(); extern char *sprintf(); /* Lint needs this */ -h- cppdef.h Mon Jan 7 23:59:27 1985 cppdef.h /* * S y s t e m D e p e n d e n t * D e f i n i t i o n s f o r C P P * * Definitions in this file may be edited to configure CPP for particular * host operating systems and target configurations. * * NOTE: cpp assumes it is compiled by a compiler that supports macros * with arguments. If this is not the case (as for Decus C), #define * nomacarg -- and provide function equivalents for all macros. * * cpp also assumes the host and target implement the Ascii character set. * If this is not the case, you will have to do some editing here and there. */ /* * This redundant definition of TRUE and FALSE works around * a limitation of Decus C. */ #ifndef TRUE #define TRUE 1 #define FALSE 0 #endif /* * Define the HOST operating system. This is needed so that * cpp can use appropriate filename conventions. */ #define SYS_UNKNOWN 0 #define SYS_UNIX 1 #define SYS_VMS 2 #define SYS_RSX 3 #define SYS_RT11 4 #define SYS_LATTICE 5 #define SYS_ONYX 6 #define SYS_68000 7 #ifndef HOST #ifdef unix #define HOST SYS_UNIX #else #ifdef vms #define HOST SYS_VMS #else #ifdef rsx #define HOST SYS_RSX #else #ifdef rt11 #define HOST SYS_RT11 #endif #endif #endif #endif #endif #ifndef HOST #define HOST SYS_UNKNOWN #endif /* * We assume that the target is the same as the host system */ #ifndef TARGET #define TARGET HOST #endif /* * In order to predefine machine-dependent constants, * several strings are defined here: * * MACHINE defines the target cpu (by name) * SYSTEM defines the target operating system * COMPILER defines the target compiler * * The above may be #defined as "" if they are not wanted. * They should not be #defined as NULL. * * LINE_PREFIX defines the # output line prefix, if not "line" * This should be defined as "" if cpp is to replace * the "standard" C pre-processor. * * FILE_LOCAL marks functions which are referenced only in the * file they reside. Some C compilers allow these * to be marked "static" even though they are referenced * by "extern" statements elsewhere. * * OK_DOLLAR Should be set TRUE if $ is a valid alphabetic character * in identifiers (default), or zero if $ is invalid. * Default is TRUE. * * OK_CONCAT Should be set TRUE if # may be used to concatenate * tokens in macros (per the Ansi Draft Standard) or * FALSE for old-style # processing (needed if cpp is * to process assembler source code). * * OK_DATE Predefines the compilation date if set TRUE. * Not permitted by the Nov. 12, 1984 Draft Standard. * * S_CHAR etc. Define the sizeof the basic TARGET machine word types. * By default, sizes are set to the values for the HOST * computer. If this is inappropriate, see the code in * cpp3.c for details on what to change. Also, if you * have a machine where sizeof (signed int) differs from * sizeof (unsigned int), you will have to edit code and * tables in cpp3.c (and extend the -S option definition.) * * CPP_LIBRARY May be defined if you have a site-specific include directory * which is to be searched *before* the operating-system * specific directories. */ #if TARGET == SYS_LATTICE /* * We assume the operating system is pcdos for the IBM-PC. * We also assume the small model (just like the PDP-11) */ #define MACHINE "i8086" #define SYSTEM "pcdos" #endif #if TARGET == SYS_ONYX #define MACHINE "z8000" #define SYSTEM "unix" #endif #if TARGET == SYS_VMS #define MACHINE "vax" #define SYSTEM "vms" #define COMPILER "vax11c" #endif #if TARGET == SYS_RSX #define MACHINE "pdp11" #define SYSTEM "rsx" #define COMPILER "decus" #endif #if TARGET == SYS_RT11 #define MACHINE "pdp11" #define SYSTEM "rt11" #define COMPILER "decus" #endif #if TARGET == SYS_68000 /* * All three machine designators have been seen in various systems. * Warning -- compilers differ as to sizeof (int). cpp3 assumes that * sizeof (int) == 2 */ #define MACHINE "M68000", "m68000", "m68k" #define SYSTEM "unix" #endif #if TARGET == SYS_UNIX #define SYSTEM "unix" #ifdef pdp11 #define MACHINE "pdp11" #endif #ifdef vax #define MACHINE "vax" #endif #endif /* * defaults */ #ifndef MSG_PREFIX #define MSG_PREFIX "cpp: " #endif #ifndef LINE_PREFIX #ifdef decus #define LINE_PREFIX "" #else #define LINE_PREFIX "line" #endif #endif /* * OLD_PREPROCESSOR forces the definition of OK_DOLLAR, OK_CONCAT, * COMMENT_INVISIBLE, and STRING_FORMAL to values appropriate for * an old-style preprocessor. */ #ifndef OLD_PREPROCESSOR #define OLD_PREPROCESSOR FALSE #endif #if OLD_PREPROCESSOR #define OK_DOLLAR FALSE #define OK_CONCAT FALSE #define COMMENT_INVISIBLE TRUE #define STRING_FORMAL TRUE #endif /* * RECURSION_LIMIT may be set to -1 to disable the macro recursion test. */ #ifndef RECURSION_LIMIT #define RECURSION_LIMIT 1000 #endif /* * BITS_CHAR may be defined to set the number of bits per character. * it is needed only for multi-byte character constants. */ #ifndef BITS_CHAR #define BITS_CHAR 8 #endif /* * BIG_ENDIAN is set TRUE on machines (such as the IBM 360 series) * where 'ab' stores 'a' in the high-bits and 'b' in the low-bits. * It is set FALSE on machines (such as the PDP-11 and Vax-11) * where 'ab' stores 'a' in the low-bits and 'b' in the high-bits. * (Or is it the other way around?) -- Warning: BIG_ENDIAN code is untested. */ #ifndef BIG_ENDIAN #define BIG_ENDIAN FALSE #endif /* * COMMENT_INVISIBLE may be defined to allow "old-style" comment * processing, whereby the comment becomes a zero-length token * delimiter. This permitted tokens to be concatenated in macro * expansions. This was removed from the Draft Ansi Standard. */ #ifndef COMMENT_INVISIBLE #define COMMENT_INVISIBLE FALSE #endif /* * STRING_FORMAL may be defined to allow recognition of macro parameters * anywhere in replacement strings. This was removed from the Draft Ansi * Standard and a limited recognition capability added. */ #ifndef STRING_FORMAL #define STRING_FORMAL FALSE #endif /* * OK_DOLLAR enables use of $ as a valid "letter" in identifiers. * This is a permitted extension to the Ansi Standard and is required * for e.g., VMS, RSX-11M, etc. It should be set FALSE if cpp is * used to preprocess assembler source on Unix systems. OLD_PREPROCESSOR * sets OK_DOLLAR FALSE for that reason. */ #ifndef OK_DOLLAR #define OK_DOLLAR TRUE #endif /* * OK_CONCAT enables (one possible implementation of) token concatenation. * If cpp is used to preprocess Unix assembler source, this should be * set FALSE as the concatenation character, #, is used by the assembler. */ #ifndef OK_CONCAT #define OK_CONCAT TRUE #endif /* * OK_DATE may be enabled to predefine today's date as a string * at the start of each compilation. This is apparently not permitted * by the Draft Ansi Standard. */ #ifndef OK_DATE #define OK_DATE TRUE #endif /* * Some common definitions. */ #ifndef DEBUG #define DEBUG FALSE #endif /* * The following definitions are used to allocate memory for * work buffers. In general, they should not be modified * by implementors. * * PAR_MAC The maximum number of #define parameters (31 per Standard) * Note: we need another one for strings. * IDMAX The longest identifier, 31 per Ansi Standard * NBUFF Input buffer size * NWORK Work buffer size -- the longest macro * must fit here after expansion. * NEXP The nesting depth of #if expressions * NINCLUDE The number of directories that may be specified * on a per-system basis, or by the -I option. * BLK_NEST The number of nested #if's permitted. */ #define IDMAX 31 #define PAR_MAC (31 + 1) #define NBUFF 512 #define NWORK 512 #define NEXP 128 #define NINCLUDE 7 #define NPARMWORK (NWORK * 2) #define BLK_NEST 32 /* * Some special constants. These may need to be changed if cpp * is ported to a wierd machine. * * NOTE: if cpp is run on a non-ascii machine, ALERT and VT may * need to be changed. They are used to implement the proposed * ANSI standard C control characters '\a' and '\v' only. * DEL is used to tag macro tokens to prevent #define foo foo * from looping. Note that we don't try to prevent more elaborate * #define loops from occurring. */ #ifndef ALERT #define ALERT '\007' /* '\a' is "Bell" */ #endif #ifndef VT #define VT '\013' /* Vertical Tab CTRL/K */ #endif #ifndef FILE_LOCAL #ifdef decus #define FILE_LOCAL static #else #ifdef vax11c #define FILE_LOCAL static #else #define FILE_LOCAL /* Others are global */ #endif #endif #endif