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452
study/linux-travel/MINIX-1.5/1.5/Source/commands/m4/main.c
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452
study/linux-travel/MINIX-1.5/1.5/Source/commands/m4/main.c
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/*
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* main.c
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* Facility: m4 macro processor
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* by: oz
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*/
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#include "mdef.h"
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/*
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* m4 - macro processor
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*
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* PD m4 is based on the macro tool distributed with the software
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* tools (VOS) package, and described in the "SOFTWARE TOOLS" and
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* "SOFTWARE TOOLS IN PASCAL" books. It has been expanded to include
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* most of the command set of SysV m4, the standard UN*X macro processor.
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*
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* Since both PD m4 and UN*X m4 are based on SOFTWARE TOOLS macro,
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* there may be certain implementation similarities between
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* the two. The PD m4 was produced without ANY references to m4
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* sources.
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*
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* References:
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*
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* Software Tools distribution: macro
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*
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* Kernighan, Brian W. and P. J. Plauger, SOFTWARE
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* TOOLS IN PASCAL, Addison-Wesley, Mass. 1981
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*
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* Kernighan, Brian W. and P. J. Plauger, SOFTWARE
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* TOOLS, Addison-Wesley, Mass. 1976
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*
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* Kernighan, Brian W. and Dennis M. Ritchie,
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* THE M4 MACRO PROCESSOR, Unix Programmer's Manual,
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* Seventh Edition, Vol. 2, Bell Telephone Labs, 1979
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*
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* System V man page for M4
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*
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* Modification History:
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*
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* Jan 28 1986 Oz Break the whole thing into little
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* pieces, for easier (?) maintenance.
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*
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* Dec 12 1985 Oz Optimize the code, try to squeeze
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* few microseconds out..
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*
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* Dec 05 1985 Oz Add getopt interface, define (-D),
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* undefine (-U) options.
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*
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* Oct 21 1985 Oz Clean up various bugs, add comment handling.
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*
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* June 7 1985 Oz Add some of SysV m4 stuff (m4wrap, pushdef,
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* popdef, decr, shift etc.).
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*
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* June 5 1985 Oz Initial cut.
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*
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* Implementation Notes:
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*
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* [1] PD m4 uses a different (and simpler) stack mechanism than the one
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* described in Software Tools and Software Tools in Pascal books.
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* The triple stack nonsense is replaced with a single stack containing
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* the call frames and the arguments. Each frame is back-linked to a
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* previous stack frame, which enables us to rewind the stack after
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* each nested call is completed. Each argument is a character pointer
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* to the beginning of the argument string within the string space.
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* The only exceptions to this are (*) arg 0 and arg 1, which are
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* the macro definition and macro name strings, stored dynamically
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* for the hash table.
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*
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* . .
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* | . | <-- sp | . |
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* +-------+ +-----+
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* | arg 3 ------------------------------->| str |
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* +-------+ | . |
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* | arg 2 --------------+ .
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* +-------+ |
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* * | | |
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* +-------+ | +-----+
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* | plev | <-- fp +---------------->| str |
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* +-------+ | . |
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* | type | .
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* +-------+
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* | prcf -----------+ plev: paren level
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* +-------+ | type: call type
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* | . | | prcf: prev. call frame
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* . |
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* +-------+ |
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* | <----------+
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* +-------+
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*
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* [2] We have three types of null values:
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*
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* nil - nodeblock pointer type 0
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* null - null string ("")
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* NULL - Stdio-defined NULL
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*
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*/
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ndptr hashtab[HASHSIZE]; /* hash table for macros etc. */
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char buf[BUFSIZE]; /* push-back buffer */
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char *bp = buf; /* first available character */
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char *endpbb = buf+BUFSIZE; /* end of push-back buffer */
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stae mstack[STACKMAX+1]; /* stack of m4 machine */
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char strspace[STRSPMAX+1]; /* string space for evaluation */
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char *ep = strspace; /* first free char in strspace */
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char *endest= strspace+STRSPMAX;/* end of string space */
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int sp; /* current m4 stack pointer */
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int fp; /* m4 call frame pointer */
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FILE *infile[MAXINP]; /* input file stack (0=stdin) */
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FILE *outfile[MAXOUT]; /* diversion array(0=bitbucket)*/
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FILE *active; /* active output file pointer */
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char *m4temp; /* filename for diversions */
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int ilevel = 0; /* input file stack pointer */
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int oindex = 0; /* diversion index.. */
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char *null = ""; /* as it says.. just a null.. */
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char *m4wraps = ""; /* m4wrap string default.. */
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char lquote = LQUOTE; /* left quote character (`) */
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char rquote = RQUOTE; /* right quote character (') */
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char scommt = SCOMMT; /* start character for comment */
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char ecommt = ECOMMT; /* end character for comment */
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struct keyblk keywrds[] = { /* m4 keywords to be installed */
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"include", INCLTYPE,
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"sinclude", SINCTYPE,
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"define", DEFITYPE,
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"defn", DEFNTYPE,
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"divert", DIVRTYPE,
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"expr", EXPRTYPE,
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"eval", EXPRTYPE,
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"substr", SUBSTYPE,
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"ifelse", IFELTYPE,
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"ifdef", IFDFTYPE,
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"len", LENGTYPE,
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"incr", INCRTYPE,
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"decr", DECRTYPE,
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"dnl", DNLNTYPE,
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"changequote", CHNQTYPE,
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"changecom", CHNCTYPE,
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"index", INDXTYPE,
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#ifdef EXTENDED
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"paste", PASTTYPE,
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"spaste", SPASTYPE,
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#endif
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"popdef", POPDTYPE,
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"pushdef", PUSDTYPE,
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"dumpdef", DUMPTYPE,
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"shift", SHIFTYPE,
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"translit", TRNLTYPE,
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"undefine", UNDFTYPE,
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"undivert", UNDVTYPE,
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"divnum", DIVNTYPE,
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"maketemp", MKTMTYPE,
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"errprint", ERRPTYPE,
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"m4wrap", M4WRTYPE,
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"m4exit", EXITTYPE,
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#if unix || vms
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"syscmd", SYSCTYPE,
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"sysval", SYSVTYPE,
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#endif
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#if unix
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"unix", MACRTYPE,
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#else
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#if vms
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"vms", MACRTYPE,
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#endif
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#endif
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};
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#define MAXKEYS (sizeof(keywrds)/sizeof(struct keyblk))
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extern ndptr lookup();
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extern ndptr addent();
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extern int onintr();
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extern char *malloc();
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extern char *mktemp();
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extern int optind;
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extern char *optarg;
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main(argc,argv)
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char *argv[];
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{
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register int c;
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register int n;
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char *p;
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if (signal(SIGINT, SIG_IGN) != SIG_IGN)
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signal(SIGINT, onintr);
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#ifdef NONZEROPAGES
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initm4();
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#endif
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initkwds();
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while ((c = getopt(argc, argv, "tD:U:o:")) != EOF)
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switch(c) {
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case 'D': /* define something..*/
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for (p = optarg; *p; p++)
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if (*p == '=')
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break;
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if (*p)
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*p++ = EOS;
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dodefine(optarg, p);
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break;
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case 'U': /* undefine... */
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remhash(optarg, TOP);
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break;
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case 'o': /* specific output */
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case '?':
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default:
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usage();
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}
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infile[0] = stdin; /* default input (naturally) */
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active = stdout; /* default active output */
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m4temp = mktemp(DIVNAM); /* filename for diversions */
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sp = -1; /* stack pointer initialized */
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fp = 0; /* frame pointer initialized */
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macro(); /* get some work done here */
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if (*m4wraps) { /* anything for rundown ?? */
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ilevel = 0; /* in case m4wrap includes.. */
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putback(EOF); /* eof is a must !! */
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pbstr(m4wraps); /* user-defined wrapup act */
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macro(); /* last will and testament */
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}
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else /* default wrap-up: undivert */
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for (n = 1; n < MAXOUT; n++)
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if (outfile[n] != NULL)
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getdiv(n);
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/* remove bitbucket if used */
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if (outfile[0] != NULL) {
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(void) fclose(outfile[0]);
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m4temp[UNIQUE] = '0';
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#if vms
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(void) remove(m4temp);
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#else
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(void) unlink(m4temp);
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#endif
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}
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exit(0);
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}
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ndptr inspect(); /* forward ... */
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/*
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* macro - the work horse..
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*
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*/
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macro() {
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char token[MAXTOK];
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register char *s;
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register int t, l;
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register ndptr p;
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register int nlpar;
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cycle {
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if ((t = gpbc()) == '_' || isalpha(t)) {
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putback(t);
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if ((p = inspect(s = token)) == nil) {
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if (sp < 0)
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while (*s)
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putc(*s++, active);
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else
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while (*s)
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chrsave(*s++);
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}
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else {
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/*
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* real thing.. First build a call frame:
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*
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*/
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pushf(fp); /* previous call frm */
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pushf(p->type); /* type of the call */
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pushf(0); /* parenthesis level */
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fp = sp; /* new frame pointer */
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/*
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* now push the string arguments:
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*
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*/
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pushs(p->defn); /* defn string */
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pushs(p->name); /* macro name */
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pushs(ep); /* start next..*/
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putback(l = gpbc());
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if (l != LPAREN) { /* add bracks */
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putback(RPAREN);
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putback(LPAREN);
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}
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}
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}
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else if (t == EOF) {
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if (sp > -1)
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error("m4: unexpected end of input");
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if (--ilevel < 0)
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break; /* all done thanks.. */
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(void) fclose(infile[ilevel+1]);
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continue;
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}
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/*
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* non-alpha single-char token seen..
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* [the order of else if .. stmts is
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* important.]
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*
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*/
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else if (t == lquote) { /* strip quotes */
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nlpar = 1;
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do {
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if ((l = gpbc()) == rquote)
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nlpar--;
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else if (l == lquote)
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nlpar++;
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else if (l == EOF)
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error("m4: missing right quote");
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if (nlpar > 0) {
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if (sp < 0)
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putc(l, active);
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else
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chrsave(l);
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}
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}
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while (nlpar != 0);
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}
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else if (sp < 0) { /* not in a macro at all */
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if (t == scommt) { /* comment handling here */
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putc(t, active);
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while ((t = gpbc()) != ecommt)
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putc(t, active);
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}
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putc(t, active); /* output directly.. */
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}
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else switch(t) {
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case LPAREN:
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if (PARLEV > 0)
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chrsave(t);
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while (isspace(l = gpbc()))
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; /* skip blank, tab, nl.. */
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putback(l);
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PARLEV++;
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break;
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case RPAREN:
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if (--PARLEV > 0)
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chrsave(t);
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else { /* end of argument list */
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chrsave(EOS);
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if (sp == STACKMAX)
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error("m4: internal stack overflow");
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if (CALTYP == MACRTYPE)
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expand(mstack+fp+1, sp-fp);
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else
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eval(mstack+fp+1, sp-fp, CALTYP);
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ep = PREVEP; /* flush strspace */
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sp = PREVSP; /* previous sp.. */
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fp = PREVFP; /* rewind stack...*/
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}
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break;
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case COMMA:
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if (PARLEV == 1) {
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chrsave(EOS); /* new argument */
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while (isspace(l = gpbc()))
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;
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putback(l);
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pushs(ep);
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}
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break;
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default:
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chrsave(t); /* stack the char */
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break;
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}
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}
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}
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/*
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* build an input token..
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* consider only those starting with _ or A-Za-z. This is a
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* combo with lookup to speed things up.
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*/
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ndptr
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inspect(tp)
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register char *tp;
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{
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register int h = 0;
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register char c;
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register char *name = tp;
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register char *etp = tp+MAXTOK;
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register ndptr p;
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while (tp < etp && (isalnum(c = gpbc()) || c == '_'))
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h += (*tp++ = c);
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putback(c);
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if (tp == etp)
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error("m4: token too long");
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*tp = EOS;
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for (p = hashtab[h%HASHSIZE]; p != nil; p = p->nxtptr)
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if (strcmp(name, p->name) == 0)
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break;
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return(p);
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}
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#ifdef NONZEROPAGES
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/*
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* initm4 - initialize various tables. Useful only if your system
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* does not know anything about demand-zero pages.
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*
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*/
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initm4()
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{
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register int i;
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for (i = 0; i < HASHSIZE; i++)
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hashtab[i] = nil;
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for (i = 0; i < MAXOUT; i++)
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outfile[i] = NULL;
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}
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#endif
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/*
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* initkwds - initialise m4 keywords as fast as possible.
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* This very similar to install, but without certain overheads,
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* such as calling lookup. Malloc is not used for storing the
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* keyword strings, since we simply use the static pointers
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* within keywrds block. We also assume that there is enough memory
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* to at least install the keywords (i.e. malloc won't fail).
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*
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*/
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initkwds() {
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register int i;
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register int h;
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register ndptr p;
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for (i = 0; i < MAXKEYS; i++) {
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h = hash(keywrds[i].knam);
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p = (ndptr) malloc(sizeof(struct ndblock));
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p->nxtptr = hashtab[h];
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hashtab[h] = p;
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p->name = keywrds[i].knam;
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p->defn = null;
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p->type = keywrds[i].ktyp | STATIC;
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}
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}
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Block a user