cv/mgflib/parser.h

/* Copyright (c) 1994 Regents of the University of California */

/* SCCSid "$SunId$ LBL" */

/*
 * Header file for MGF interpreter
 */

/* must include stdio.h before us */

                        /* Entities (order doesn't really matter) */
#define MG_E_COMMENT    0
#define MG_E_COLOR      1
#define MG_E_CONE       2
#define MG_E_CXY        3
#define MG_E_CYL        4
#define MG_E_ED         5
#define MG_E_FACE       6
#define MG_E_INCLUDE    7
#define MG_E_IES        8
#define MG_E_MATERIAL   9
#define MG_E_NORMAL     10
#define MG_E_OBJECT     11
#define MG_E_POINT      12
#define MG_E_RD         13
#define MG_E_RING       14
#define MG_E_RS         15
#define MG_E_SPH        16
#define MG_E_TD         17
#define MG_E_TORUS      18
#define MG_E_TS         19
#define MG_E_VERTEX     20
#define MG_E_XF         21

#define MG_NENTITIES    22

#define MG_NAMELIST     {"#","c","cone","cxy","cyl","ed","f","i","ies",\
        "m","n","o","p","rd","ring","rs","sph","td","torus","ts","v","xf"}

#define MG_MAXELEN      6

extern char     mg_ename[MG_NENTITIES][MG_MAXELEN];

                        /* Handler routines for each entity */

#ifdef NOPROTO
extern int      (*mg_ehand[MG_NENTITIES])();
#else
extern int      (*mg_ehand[MG_NENTITIES])(int argc, char **argv);
#endif

                        /* Error codes */
#define MG_OK           0               /* normal return value */
#define MG_EUNK         1               /* unknown entity */
#define MG_EARGC        2               /* wrong number of arguments */
#define MG_ETYPE        3               /* argument type error */
#define MG_EILL         4               /* illegal argument value */
#define MG_EUNDEF       5               /* undefined reference */
#define MG_ENOFILE      6               /* cannot open input file */
#define MG_EINCL        7               /* error in included file */
#define MG_EMEM         8               /* out of memory */
#define MG_ESEEK        9               /* file seek error */
#define MG_EBADMAT      10              /* bad material specification */

#define MG_NERRS        11

extern char     *mg_err[MG_NERRS];

/*
 * The general process for running the parser is to fill in the mg_ehand
 * array with handlers for each entity you know how to handle.
 * Then, call mg_init to fill in the rest.  This function will report
 * an error and quit if you try to support an inconsistent set of entities.
 * For each file you want to parse, call mg_load with the file name.
 * To read from standard input, use NULL as the file name.
 * For additional control over error reporting and file management,
 * use mg_open, mg_read, mg_parse and mg_close instead of mg_load.
 * To free any data structures and clear the parser, use mg_clear.
 * If there is an error, mg_load, mg_open, mg_parse, and mg_rewind
 * will return an error from the list above.  In addition, mg_load
 * will report the error to stderr.  The mg_read routine returns 0
 * when the end of file has been reached.
 */

#define MG_MAXLINE      512             /* maximum input line length */
#define MG_MAXARGC      (MG_MAXLINE/4)  /* maximum argument count */

typedef struct mg_fctxt {
        char    *fname;                         /* file name */
        FILE    *fp;                            /* stream pointer */
        char    inpline[MG_MAXLINE];            /* input line */
        int     lineno;                         /* line number */
        struct mg_fctxt *prev;                  /* previous context */
} MG_FCTXT;

extern MG_FCTXT *mg_file;               /* current file context */

#ifdef NOPROTO
extern void     mg_init();              /* fill in mg_ehand array */
extern int      mg_load();              /* parse a file */
extern int      mg_open();              /* open new input file */
extern int      mg_read();              /* read next line */
extern int      mg_parse();             /* parse current line */
extern int      mg_rewind();            /* rewind input file */
extern void     mg_close();             /* close input file */
extern void     mg_clear();             /* clear parser */
extern int      mg_iterate();
#else
extern void     mg_init(void);          /* fill in mg_ehand array */
extern int      mg_load(char *);        /* parse a file */
extern int      mg_open(MG_FCTXT *, char *);    /* open new input file */
extern int      mg_read(void);          /* read next line */
extern int      mg_parse(void);         /* parse current line */
extern int      mg_rewind(void);        /* rewind input file */
extern void     mg_close(void);         /* close input file */
extern void     mg_clear(void);         /* clear parser */
extern int      mg_iterate(int, char **, int (*)(void));
#endif

#ifndef MG_NQCD
#define MG_NQCD         5               /* default number of divisions */
#endif

extern int      mg_nqcdivs;             /* divisions per quarter circle */

/*
 * The following library routines are included for your convenience:
 */

#ifdef NOPROTO
extern int mg_entity();                 /* get entity number from its name */
extern int isint();                     /* non-zero if integer format */
extern int isflt();                     /* non-zero if floating point format */
#else
extern int mg_entity(char *);           /* get entity number from its name */
extern int isint(char *);               /* non-zero if integer format */
extern int isflt(char *);               /* non-zero if floating point format */
#endif

/************************************************************************
 *      Definitions for 3-d vector manipulation functions
 */

#ifdef SMLFLT
#define FLOAT   float
#else
#define FLOAT   double
#endif

typedef FLOAT  FVECT[3];

#ifdef NOPROTO
extern double   normalize();            /* normalize a vector */
#else
extern double   normalize(FVECT);       /* normalize a vector */
#endif

/************************************************************************
 *      Definitions for context handling routines
 *      (materials, colors, vectors)
 */

typedef struct {
        float   cx, cy;         /* XY chromaticity coordinates */
} C_COLOR;              /* color context */

typedef struct {
        char    *name;          /* material name */
        int     clock;          /* incremented each change -- resettable */
        float   rd;             /* diffuse reflectance */
        C_COLOR rd_c;           /* diffuse reflectance color */
        float   td;             /* diffuse transmittance */
        C_COLOR td_c;           /* diffuse transmittance color */
        float   ed;             /* diffuse emittance */
        C_COLOR ed_c;           /* diffuse emittance color */
        float   rs;             /* specular reflectance */
        C_COLOR rs_c;           /* specular reflectance color */
        float   rs_a;           /* specular reflectance roughness */
        float   ts;             /* specular transmittance */
        C_COLOR ts_c;           /* specular transmittance color */
        float   ts_a;           /* specular transmittance roughness */
} C_MATERIAL;           /* material context */

typedef struct {
        FVECT   p, n;           /* point and normal */
} C_VERTEX;             /* vertex context */

#define C_DEFCOLOR      {.333,.333}
#define C_DEFMATERIAL   {NULL,1,0.,C_DEFCOLOR,0.,C_DEFCOLOR,0.,C_DEFCOLOR,\
                                        0.,C_DEFCOLOR,0.,0.,C_DEFCOLOR,0.}
#define C_DEFVERTEX     {{0.,0.,0.},{0.,0.,0.}}

extern C_COLOR          *c_ccolor;      /* the current color */
extern C_MATERIAL       *c_cmaterial;   /* the current material */
extern C_VERTEX         *c_cvertex;     /* the current vertex */

#ifdef NOPROTO
extern int      c_hcolor();                     /* handle color entity */
extern int      c_hmaterial();                  /* handle material entity */
extern int      c_hvertex();                    /* handle vertex entity */
extern void     c_clearall();                   /* clear context tables */
extern C_VERTEX *c_getvert();                   /* get a named vertex */
#else
extern int      c_hcolor(int, char **);         /* handle color entity */
extern int      c_hmaterial(int, char **);      /* handle material entity */
extern int      c_hvertex(int, char **);        /* handle vertex entity */
extern void     c_clearall(void);               /* clear context tables */
extern C_VERTEX *c_getvert(char *);             /* get a named vertex */
#endif

/*************************************************************************
 *      Definitions for hierarchical object name handler
 */

extern int      obj_nnames;             /* depth of name hierarchy */
extern char     **obj_name;             /* names in hierarchy */

#ifdef NOPROTO
extern int      obj_handler();                  /* handle an object entity */
extern void     obj_clear();                    /* clear object stack */
#else
extern int      obj_handler(int, char **);      /* handle an object entity */
extern void     obj_clear(void);                /* clear object stack */
#endif

/**************************************************************************
 *      Definitions for hierarchical transformation handler
 */

typedef FLOAT  MAT4[4][4];

#ifdef  BSD
#define  copymat4(m4a,m4b)      bcopy((char *)m4b,(char *)m4a,sizeof(MAT4))
#else
#define  copymat4(m4a,m4b)      (void)memcpy((char *)m4a,(char *)m4b,sizeof(MAT4))
extern char  *memcpy();
#endif

#define  MAT4IDENT              { {1.,0.,0.,0.}, {0.,1.,0.,0.}, \
                                {0.,0.,1.,0.}, {0.,0.,0.,1.} }

extern MAT4  m4ident;

#define  setident4(m4)          copymat4(m4, m4ident)

                                /* regular transformation */
typedef struct {
        MAT4  xfm;                              /* transform matrix */
        FLOAT  sca;                             /* scalefactor */
}  XF;

#define identxf(xp)             (void)(setident4((xp)->xfm),(xp)->sca=1.0)

typedef struct xf_spec {
        short   xac;            /* transform argument count */
        short   xav0;           /* zeroeth argument in xf_argv array */
        XF      xf;             /* cumulative transformation */
        struct xf_spec  *prev;  /* previous transformation context */
} XF_SPEC;

extern int      xf_argc;                        /* total # transform args. */
extern char     **xf_argv;                      /* transform arguments */
extern XF_SPEC  *xf_context;                    /* current context */

/*
 * The transformation handler should do most of the work that needs
 * doing.  Just pass it any xf entities, then use the associated
 * functions to transform and translate points, transform vectors
 * (without translation), rotate vectors (without scaling) and scale
 * values appropriately.
 *
 * The routines xf_xfmpoint, xf_xfmvect and xf_rotvect take two
 * 3-D vectors (which may be identical), transforms the second and
 * puts the result into the first.
 */

#ifdef NOPROTO

extern int      xf_handler();           /* handle xf entity */
extern void     xf_xfmpoint();          /* transform point */
extern void     xf_xfmvect();           /* transform vector */
extern void     xf_rotvect();           /* rotate vector */
extern double   xf_scale();             /* scale a value */
extern void     xf_clear();             /* clear xf stack */

/* The following are support routines you probably won't call directly */

extern void     multmat4();             /* m4a = m4b X m4c */
extern void     multv3();               /* v3a = v3b X m4 (vectors) */
extern void     multp3();               /* p3a = p3b X m4 (points) */
extern int      xf();                   /* interpret transform spec. */

#else

extern int      xf_handler(int, char **);       /* handle xf entity */
extern void     xf_xfmpoint(FVECT, FVECT);      /* transform point */
extern void     xf_xfmvect(FVECT, FVECT);       /* transform vector */
extern void     xf_rotvect(FVECT, FVECT);       /* rotate vector */
extern double   xf_scale(double);               /* scale a value */
extern void     xf_clear(void);                 /* clear xf stack */

/* The following are support routines you probably won't call directly */

extern void     multmat4(MAT4, MAT4, MAT4);     /* m4a = m4b X m4c */
extern void     multv3(FVECT, FVECT, MAT4);     /* v3a = v3b X m4 (vectors) */
extern void     multp3(FVECT, FVECT, MAT4);     /* p3a = p3b X m4 (points) */
extern int      xf(XF, int, char **);           /* interpret transform spec. */

#endif

/************************************************************************
 *      Miscellaneous definitions
 */

#ifdef  M_PI
#define  PI             M_PI
#else
#define  PI             3.14159265358979323846
#endif

#ifdef DCL_ATOF
extern double   atof();
#endif

#ifndef MEM_PTR
#define MEM_PTR         void *
#endif

extern MEM_PTR  malloc();
extern MEM_PTR  calloc();
extern MEM_PTR  realloc();
Revision:	1.2
Committed:	Wed Jun 22 15:33:42 1994 UTC (31 years, 4 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.1:	+32 -19 lines
Log Message:	various enhancements and fixes
#	User	Rev	Content
1	greg	1.1	/* Copyright (c) 1994 Regents of the University of California */
2
3			/* SCCSid "$SunId$ LBL" */
4
5			/*
6			* Header file for MGF interpreter
7			*/
8
9			/* must include stdio.h before us */
10
11			/* Entities (order doesn't really matter) */
12			#define MG_E_COMMENT 0
13			#define MG_E_COLOR 1
14			#define MG_E_CONE 2
15			#define MG_E_CXY 3
16			#define MG_E_CYL 4
17			#define MG_E_ED 5
18			#define MG_E_FACE 6
19			#define MG_E_INCLUDE 7
20			#define MG_E_IES 8
21			#define MG_E_MATERIAL 9
22			#define MG_E_NORMAL 10
23			#define MG_E_OBJECT 11
24			#define MG_E_POINT 12
25			#define MG_E_RD 13
26			#define MG_E_RING 14
27			#define MG_E_RS 15
28			#define MG_E_SPH 16
29			#define MG_E_TD 17
30			#define MG_E_TORUS 18
31			#define MG_E_TS 19
32			#define MG_E_VERTEX 20
33			#define MG_E_XF 21
34
35			#define MG_NENTITIES 22
36
37			#define MG_NAMELIST {"#","c","cone","cxy","cyl","ed","f","i","ies",\
38			"m","n","o","p","rd","ring","rs","sph","td","torus","ts","v","xf"}
39
40			#define MG_MAXELEN 6
41
42			extern char mg_ename[MG_NENTITIES][MG_MAXELEN];
43
44			/* Handler routines for each entity */
45
46			#ifdef NOPROTO
47			extern int (*mg_ehand[MG_NENTITIES])();
48			#else
49			extern int (mg_ehand[MG_NENTITIES])(int argc, char *argv);
50			#endif
51
52			/* Error codes */
53			#define MG_OK 0 /* normal return value */
54			#define MG_EUNK 1 /* unknown entity */
55			#define MG_EARGC 2 /* wrong number of arguments */
56			#define MG_ETYPE 3 /* argument type error */
57			#define MG_EILL 4 /* illegal argument value */
58			#define MG_EUNDEF 5 /* undefined reference */
59			#define MG_ENOFILE 6 /* cannot open input file */
60			#define MG_EINCL 7 /* error in included file */
61			#define MG_EMEM 8 /* out of memory */
62			#define MG_ESEEK 9 /* file seek error */
63	greg	1.2	#define MG_EBADMAT 10 /* bad material specification */
64	greg	1.1
65	greg	1.2	#define MG_NERRS 11
66	greg	1.1
67			extern char *mg_err[MG_NERRS];
68
69			/*
70			* The general process for running the parser is to fill in the mg_ehand
71			* array with handlers for each entity you know how to handle.
72			* Then, call mg_init to fill in the rest. This function will report
73			* an error and quit if you try to support an inconsistent set of entities.
74			* For each file you want to parse, call mg_load with the file name.
75			* To read from standard input, use NULL as the file name.
76			* For additional control over error reporting and file management,
77			* use mg_open, mg_read, mg_parse and mg_close instead of mg_load.
78			* To free any data structures and clear the parser, use mg_clear.
79			* If there is an error, mg_load, mg_open, mg_parse, and mg_rewind
80			* will return an error from the list above. In addition, mg_load
81			* will report the error to stderr. The mg_read routine returns 0
82			* when the end of file has been reached.
83			*/
84
85			#define MG_MAXLINE 512 /* maximum input line length */
86			#define MG_MAXARGC (MG_MAXLINE/4) /* maximum argument count */
87
88			typedef struct mg_fctxt {
89			char fname; / file name */
90			FILE fp; / stream pointer */
91			char inpline[MG_MAXLINE]; /* input line */
92			int lineno; /* line number */
93			struct mg_fctxt prev; / previous context */
94			} MG_FCTXT;
95
96			extern MG_FCTXT mg_file; / current file context */
97
98			#ifdef NOPROTO
99			extern void mg_init(); /* fill in mg_ehand array */
100			extern int mg_load(); /* parse a file */
101			extern int mg_open(); /* open new input file */
102			extern int mg_read(); /* read next line */
103			extern int mg_parse(); /* parse current line */
104			extern int mg_rewind(); /* rewind input file */
105			extern void mg_close(); /* close input file */
106			extern void mg_clear(); /* clear parser */
107			extern int mg_iterate();
108			#else
109			extern void mg_init(void); /* fill in mg_ehand array */
110			extern int mg_load(char ); / parse a file */
111			extern int mg_open(MG_FCTXT , char ); /* open new input file */
112			extern int mg_read(void); /* read next line */
113			extern int mg_parse(void); /* parse current line */
114			extern int mg_rewind(void); /* rewind input file */
115			extern void mg_close(void); /* close input file */
116			extern void mg_clear(void); /* clear parser */
117			extern int mg_iterate(int, char *, int ()(void));
118			#endif
119
120			#ifndef MG_NQCD
121			#define MG_NQCD 5 /* default number of divisions */
122			#endif
123
124			extern int mg_nqcdivs; /* divisions per quarter circle */
125
126			/*
127			* The following library routines are included for your convenience:
128			*/
129
130			#ifdef NOPROTO
131			extern int mg_entity(); /* get entity number from its name */
132			extern int isint(); /* non-zero if integer format */
133			extern int isflt(); /* non-zero if floating point format */
134			#else
135			extern int mg_entity(char ); / get entity number from its name */
136			extern int isint(char ); / non-zero if integer format */
137			extern int isflt(char ); / non-zero if floating point format */
138			#endif
139
140			/************************************************************************
141			* Definitions for 3-d vector manipulation functions
142			*/
143
144	greg	1.2	#ifdef SMLFLT
145			#define FLOAT float
146			#else
147			#define FLOAT double
148			#endif
149	greg	1.1
150	greg	1.2	typedef FLOAT FVECT[3];
151
152	greg	1.1	#ifdef NOPROTO
153			extern double normalize(); /* normalize a vector */
154			#else
155			extern double normalize(FVECT); /* normalize a vector */
156			#endif
157
158			/************************************************************************
159			* Definitions for context handling routines
160			* (materials, colors, vectors)
161			*/
162
163			typedef struct {
164	greg	1.2	float cx, cy; /* XY chromaticity coordinates */
165	greg	1.1	} C_COLOR; /* color context */
166
167			typedef struct {
168	greg	1.2	char name; / material name */
169			int clock; /* incremented each change -- resettable */
170			float rd; /* diffuse reflectance */
171	greg	1.1	C_COLOR rd_c; /* diffuse reflectance color */
172	greg	1.2	float td; /* diffuse transmittance */
173	greg	1.1	C_COLOR td_c; /* diffuse transmittance color */
174	greg	1.2	float ed; /* diffuse emittance */
175	greg	1.1	C_COLOR ed_c; /* diffuse emittance color */
176	greg	1.2	float rs; /* specular reflectance */
177	greg	1.1	C_COLOR rs_c; /* specular reflectance color */
178	greg	1.2	float rs_a; /* specular reflectance roughness */
179			float ts; /* specular transmittance */
180	greg	1.1	C_COLOR ts_c; /* specular transmittance color */
181	greg	1.2	float ts_a; /* specular transmittance roughness */
182	greg	1.1	} C_MATERIAL; /* material context */
183
184			typedef struct {
185			FVECT p, n; /* point and normal */
186			} C_VERTEX; /* vertex context */
187
188			#define C_DEFCOLOR {.333,.333}
189	greg	1.2	#define C_DEFMATERIAL {NULL,1,0.,C_DEFCOLOR,0.,C_DEFCOLOR,0.,C_DEFCOLOR,\
190			0.,C_DEFCOLOR,0.,0.,C_DEFCOLOR,0.}
191	greg	1.1	#define C_DEFVERTEX {{0.,0.,0.},{0.,0.,0.}}
192
193			extern C_COLOR c_ccolor; / the current color */
194			extern C_MATERIAL c_cmaterial; / the current material */
195			extern C_VERTEX c_cvertex; / the current vertex */
196
197			#ifdef NOPROTO
198			extern int c_hcolor(); /* handle color entity */
199			extern int c_hmaterial(); /* handle material entity */
200			extern int c_hvertex(); /* handle vertex entity */
201			extern void c_clearall(); /* clear context tables */
202			extern C_VERTEX c_getvert(); / get a named vertex */
203			#else
204			extern int c_hcolor(int, char *); / handle color entity */
205			extern int c_hmaterial(int, char *); / handle material entity */
206			extern int c_hvertex(int, char *); / handle vertex entity */
207			extern void c_clearall(void); /* clear context tables */
208			extern C_VERTEX c_getvert(char ); /* get a named vertex */
209			#endif
210
211			/*************************************************************************
212			* Definitions for hierarchical object name handler
213			*/
214
215			extern int obj_nnames; /* depth of name hierarchy */
216			extern char *obj_name; / names in hierarchy */
217
218			#ifdef NOPROTO
219			extern int obj_handler(); /* handle an object entity */
220	greg	1.2	extern void obj_clear(); /* clear object stack */
221	greg	1.1	#else
222			extern int obj_handler(int, char *); / handle an object entity */
223	greg	1.2	extern void obj_clear(void); /* clear object stack */
224	greg	1.1	#endif
225
226			/**************************************************************************
227			* Definitions for hierarchical transformation handler
228			*/
229
230	greg	1.2	typedef FLOAT MAT4[4][4];
231	greg	1.1
232			#ifdef BSD
233			#define copymat4(m4a,m4b) bcopy((char )m4b,(char )m4a,sizeof(MAT4))
234			#else
235			#define copymat4(m4a,m4b) (void)memcpy((char )m4a,(char )m4b,sizeof(MAT4))
236			extern char *memcpy();
237			#endif
238
239			#define MAT4IDENT { {1.,0.,0.,0.}, {0.,1.,0.,0.}, \
240			{0.,0.,1.,0.}, {0.,0.,0.,1.} }
241
242			extern MAT4 m4ident;
243
244			#define setident4(m4) copymat4(m4, m4ident)
245
246			/* regular transformation */
247			typedef struct {
248			MAT4 xfm; /* transform matrix */
249	greg	1.2	FLOAT sca; /* scalefactor */
250	greg	1.1	} XF;
251
252			#define identxf(xp) (void)(setident4((xp)->xfm),(xp)->sca=1.0)
253
254			typedef struct xf_spec {
255			short xac; /* transform argument count */
256			short xav0; /* zeroeth argument in xf_argv array */
257			XF xf; /* cumulative transformation */
258			struct xf_spec prev; / previous transformation context */
259			} XF_SPEC;
260
261			extern int xf_argc; /* total # transform args. */
262			extern char *xf_argv; / transform arguments */
263			extern XF_SPEC xf_context; / current context */
264
265			/*
266			* The transformation handler should do most of the work that needs
267			* doing. Just pass it any xf entities, then use the associated
268			* functions to transform and translate points, transform vectors
269			* (without translation), rotate vectors (without scaling) and scale
270			* values appropriately.
271			*
272			* The routines xf_xfmpoint, xf_xfmvect and xf_rotvect take two
273			* 3-D vectors (which may be identical), transforms the second and
274			* puts the result into the first.
275			*/
276
277			#ifdef NOPROTO
278
279			extern int xf_handler(); /* handle xf entity */
280			extern void xf_xfmpoint(); /* transform point */
281			extern void xf_xfmvect(); /* transform vector */
282			extern void xf_rotvect(); /* rotate vector */
283			extern double xf_scale(); /* scale a value */
284	greg	1.2	extern void xf_clear(); /* clear xf stack */
285	greg	1.1
286			/* The following are support routines you probably won't call directly */
287
288			extern void multmat4(); /* m4a = m4b X m4c */
289			extern void multv3(); /* v3a = v3b X m4 (vectors) */
290			extern void multp3(); /* p3a = p3b X m4 (points) */
291			extern int xf(); /* interpret transform spec. */
292
293			#else
294
295	greg	1.2	extern int xf_handler(int, char *); / handle xf entity */
296			extern void xf_xfmpoint(FVECT, FVECT); /* transform point */
297			extern void xf_xfmvect(FVECT, FVECT); /* transform vector */
298			extern void xf_rotvect(FVECT, FVECT); /* rotate vector */
299			extern double xf_scale(double); /* scale a value */
300			extern void xf_clear(void); /* clear xf stack */
301	greg	1.1
302			/* The following are support routines you probably won't call directly */
303
304			extern void multmat4(MAT4, MAT4, MAT4); /* m4a = m4b X m4c */
305			extern void multv3(FVECT, FVECT, MAT4); /* v3a = v3b X m4 (vectors) */
306			extern void multp3(FVECT, FVECT, MAT4); /* p3a = p3b X m4 (points) */
307			extern int xf(XF, int, char *); / interpret transform spec. */
308
309			#endif
310
311			/************************************************************************
312			* Miscellaneous definitions
313			*/
314
315			#ifdef M_PI
316			#define PI M_PI
317			#else
318			#define PI 3.14159265358979323846
319			#endif
320
321			#ifdef DCL_ATOF
322			extern double atof();
323			#endif
324
325			#ifndef MEM_PTR
326			#define MEM_PTR void *
327			#endif
328
329			extern MEM_PTR malloc();
330			extern MEM_PTR calloc();
331			extern MEM_PTR realloc();