pluralized "mod.sample" title

[unix-history] / usr.bin / m4 / mdef.h

/*  Header : mdef.h
   Author : Ozan Yigit
   Updated: 4 May 1992
*/
#ifndef MACRTYPE

#ifndef unix
#define unix 0
#endif 

#ifndef vms
#define vms 0
#endif

#include <stdio.h>
#include <signal.h>

#ifdef  __STDC__
#include <string.h>
#else
#ifdef  VOID
#define void    int
#endif
extern  int     strlen();
extern  int     strcmp();
extern  void    memcpy();
#endif

/*  m4 constants */

#define MACRTYPE        1
#define DEFITYPE        2
#define EXPRTYPE        3
#define SUBSTYPE        4
#define IFELTYPE        5
#define LENGTYPE        6
#define CHNQTYPE        7
#define SYSCTYPE        8
#define UNDFTYPE        9
#define INCLTYPE        10
#define SINCTYPE        11
#define PASTTYPE        12
#define SPASTYPE        13
#define INCRTYPE        14
#define IFDFTYPE        15
#define PUSDTYPE        16
#define POPDTYPE        17
#define SHIFTYPE        18
#define DECRTYPE        19
#define DIVRTYPE        20
#define UNDVTYPE        21
#define DIVNTYPE        22
#define MKTMTYPE        23
#define ERRPTYPE        24
#define M4WRTYPE        25
#define TRNLTYPE        26
#define DNLNTYPE        27
#define DUMPTYPE        28
#define CHNCTYPE        29
#define INDXTYPE        30
#define SYSVTYPE        31
#define EXITTYPE        32
#define DEFNTYPE        33
#define LINETYPE        34
#define TRIMTYPE        35
#define TLITTYPE        36
#define DEFQTYPE        37              /* defquote */
#define QUTRTYPE        38              /* quoter thus defined */

#define STATIC          128

/* m4 special characters */

#define ARGFLAG         '$'
#define LPAREN          '('
#define RPAREN          ')'
#define LQUOTE          '`'
#define RQUOTE          '\''
#define VQUOTE          ('V'&(' '- 1))
#define COMMA           ','
#define SCOMMT          '#'
#define ECOMMT          '\n'

/*
* other important constants
*/

#define EOS             (char) 0
#define MAXINP          10              /* maximum include files   */
#define MAXOUT          10              /* maximum # of diversions */
#ifdef  SMALL
#define MAXSTR           512            /* maximum size of string  */
#define BUFSIZE         4096            /* size of pushback buffer */
#define STACKMAX        1024            /* size of call stack      */
#define STRSPMAX        4096            /* size of string space    */
#define HASHSIZE         199            /* maximum size of hashtab */
#else
#define MAXSTR          1024            /* maximum size of string  */
#define BUFSIZE         8192            /* size of pushback buffer */
#define STACKMAX        2048            /* size of call stack      */
#define STRSPMAX        8192            /* size of string space    */
#define HASHSIZE         509            /* maximum size of hashtab */
#endif
#define MAXTOK          MAXSTR          /* maximum chars in a tokn */

#define ALL             1
#define TOP             0

#define TRUE            1
#define FALSE           0

/* m4 data structures */

typedef struct ndblock *ndptr;

struct ndblock                  /* hashtable structure        */
   {
       char    *name;          /* entry name..               */
       char    *defn;          /* definition..               */
       int     type;           /* type of the entry..        */
       ndptr   nxtptr;         /* link to next entry..       */
   };

#define nil     ((ndptr) 0)

typedef union                   /* stack structure */
   {   int     sfra;           /* frame entry  */
       char    *sstr;          /* string entry */
   } stae;

/*
* macros for readibility and/or speed
*
*      gpbc()  - get a possibly pushed-back character
*      min()   - select the minimum of two elements
*      pushf() - push a call frame entry onto stack
*      pushs() - push a string pointer onto stack
*/
#define gpbc()   bp == bb ? getc(infile[ilevel]) : *--bp
#define min(x,y) ((x > y) ? y : x)
#define pushf(x) if (sp < STACKMAX) mstack[++sp].sfra = (x)
#define pushs(x) if (sp < STACKMAX) mstack[++sp].sstr = (x)

/*
*          .                              .
*      |   .   |  <-- sp               |  .  |
*      +-------+                       +-----+
*      | arg 3 ----------------------->| str |
*      +-------+                       |  .  |
*      | arg 2 ---PREVEP-----+            .
*      +-------+             |
*          .                 |         |     |
*      +-------+             |         +-----+
*      | plev  |  PARLEV     +-------->| str |
*      +-------+                       |  .  |
*      | type  |  CALTYP                  .
*      +-------+
*      | prcf  ---PREVFP--+
*      +-------+          |
*      |   .   |  PREVSP  |
*          .              |
*      +-------+          |
*      |       <----------+
*      +-------+
*
*/
#define PARLEV  (mstack[fp].sfra)
#define CALTYP  (mstack[fp-1].sfra)
#define PREVEP  (mstack[fp+3].sstr)
#define PREVSP  (fp-3)
#define PREVFP  (mstack[fp-2].sfra)

#endif