src/common/calfunc.c

/* Copyright (c) 1991 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "$SunId$ LBL";
#endif

/*
 *  calfunc.c - routines for calcomp using functions.
 *
 *      The define BIGLIB pulls in a large number of the
 *  available math routines.
 *
 *      If VARIABLE is not defined, only library functions
 *  can be accessed.
 *
 *     4/2/86
 */

#include  <stdio.h>

#include  <errno.h>

#include  "calcomp.h"

                                /* bits in argument flag (better be right!) */
#define  AFLAGSIZ       (8*sizeof(unsigned long))
#define  ALISTSIZ       6       /* maximum saved argument list */

typedef struct activation {
    char  *name;                /* function name */
    struct activation  *prev;   /* previous activation */
    double  *ap;                /* argument list */
    unsigned long  an;          /* computed argument flags */
    EPNODE  *fun;               /* argument function */
}  ACTIVATION;          /* an activation record */

static ACTIVATION  *curact = NULL;

static double  libfunc();

#define  MAXLIB         64      /* maximum number of library functions */

static double  l_if(), l_select(), l_rand();
static double  l_floor(), l_ceil();
#ifdef  BIGLIB
static double  l_sqrt();
static double  l_sin(), l_cos(), l_tan();
static double  l_asin(), l_acos(), l_atan(), l_atan2();
static double  l_exp(), l_log(), l_log10();
#endif

#ifdef  BIGLIB
                        /* functions must be listed alphabetically */
static LIBR  library[MAXLIB] = {
    { "acos", 1, ':', l_acos },
    { "asin", 1, ':', l_asin },
    { "atan", 1, ':', l_atan },
    { "atan2", 2, ':', l_atan2 },
    { "ceil", 1, ':', l_ceil },
    { "cos", 1, ':', l_cos },
    { "exp", 1, ':', l_exp },
    { "floor", 1, ':', l_floor },
    { "if", 3, ':', l_if },
    { "log", 1, ':', l_log },
    { "log10", 1, ':', l_log10 },
    { "rand", 1, ':', l_rand },
    { "select", 1, ':', l_select },
    { "sin", 1, ':', l_sin },
    { "sqrt", 1, ':', l_sqrt },
    { "tan", 1, ':', l_tan },
};

static int  libsize = 16;

#else
                        /* functions must be listed alphabetically */
static LIBR  library[MAXLIB] = {
    { "ceil", 1, ':', l_ceil },
    { "floor", 1, ':', l_floor },
    { "if", 3, ':', l_if },
    { "rand", 1, ':', l_rand },
    { "select", 1, ':', l_select },
};

static int  libsize = 5;

#endif

extern char  *savestr(), *emalloc();

extern LIBR  *liblookup();

extern VARDEF  *argf();

#ifdef  VARIABLE
#define  resolve(ep)    ((ep)->type==VAR?(ep)->v.ln:argf((ep)->v.chan))
#else
#define  resolve(ep)    ((ep)->v.ln)
#define varlookup(name) NULL
#endif


int
fundefined(fname)               /* return # of arguments for function */
char  *fname;
{
    LIBR  *lp;
    register VARDEF  *vp;

    if ((vp = varlookup(fname)) == NULL || vp->def == NULL
                || vp->def->v.kid->type != FUNC)
        if ((lp = liblookup(fname)) == NULL)
            return(0);
        else
            return(lp->nargs);
    else
        return(nekids(vp->def->v.kid) - 1);
}


double
funvalue(fname, n, a)           /* return a function value to the user */
char  *fname;
int  n;
double  *a;
{
    ACTIVATION  act;
    register VARDEF  *vp;
    double  rval;
                                        /* push environment */
    act.name = fname;
    act.prev = curact;
    act.ap = a;
    if (n >= AFLAGSIZ)
        act.an = ~0;
    else
        act.an = (1L<<n)-1;
    act.fun = NULL;
    curact = &act;

    if ((vp = varlookup(fname)) == NULL || vp->def == NULL
                || vp->def->v.kid->type != FUNC)
        rval = libfunc(fname, vp);
    else
        rval = evalue(vp->def->v.kid->sibling);

    curact = act.prev;                  /* pop environment */
    return(rval);
}


funset(fname, nargs, assign, fptr)      /* set a library function */
char  *fname;
int  nargs;
int  assign;
double  (*fptr)();
{
    register LIBR  *lp;

    if ((lp = liblookup(fname)) == NULL) {
        if (libsize >= MAXLIB) {
            eputs("Too many library functons!\n");
            quit(1);
        }
        for (lp = &library[libsize]; lp > library; lp--)
            if (strcmp(lp[-1].fname, fname) > 0) {
                lp[0].fname = lp[-1].fname;
                lp[0].nargs = lp[-1].nargs;
                lp[0].atyp = lp[-1].atyp;
                lp[0].f = lp[-1].f;
            } else
                break;
        libsize++;
    }
    lp[0].fname = fname;                /* must be static! */
    lp[0].nargs = nargs;
    lp[0].atyp = assign;
    lp[0].f = fptr;
}


int
nargum()                        /* return number of available arguments */
{
    register int  n;

    if (curact == NULL)
        return(0);
    if (curact->fun == NULL) {
        for (n = 0; (1L<<n) & curact->an; n++)
            ;
        return(n);
    }
    return(nekids(curact->fun) - 1);
}


double
argument(n)                     /* return nth argument for active function */
register int  n;
{
    register ACTIVATION  *actp = curact;
    EPNODE  *ep;
    double  aval;

    if (actp == NULL || --n < 0) {
        eputs("Bad call to argument!\n");
        quit(1);
    }
                                                /* already computed? */
    if (n < AFLAGSIZ && 1L<<n & actp->an)
        return(actp->ap[n]);

    if (actp->fun == NULL || (ep = ekid(actp->fun, n+1)) == NULL) {
        eputs(actp->name);
        eputs(": too few arguments\n");
        quit(1);
    }
    curact = actp->prev;                        /* pop environment */
    aval = evalue(ep);                          /* compute argument */
    curact = actp;                              /* push back environment */
    if (n < ALISTSIZ) {                         /* save value */
        actp->ap[n] = aval;
        actp->an |= 1L<<n;
    }
    return(aval);
}


#ifdef  VARIABLE
VARDEF *
argf(n)                         /* return function def for nth argument */
int  n;
{
    register ACTIVATION  *actp;
    register EPNODE  *ep;

    for (actp = curact; actp != NULL; actp = actp->prev) {

        if (n <= 0)
            break;

        if (actp->fun == NULL)
            goto badarg;

        if ((ep = ekid(actp->fun, n)) == NULL) {
            eputs(actp->name);
            eputs(": too few arguments\n");
            quit(1);
        }
        if (ep->type == VAR)
            return(ep->v.ln);                   /* found it */

        if (ep->type != ARG)
            goto badarg;

        n = ep->v.chan;                         /* try previous context */
    }
    eputs("Bad call to argf!\n");
    quit(1);

badarg:
    eputs(actp->name);
    eputs(": argument not a function\n");
    quit(1);
}


char *
argfun(n)                       /* return function name for nth argument */
int  n;
{
    return(argf(n)->name);
}
#endif


double
efunc(ep)                               /* evaluate a function */
register EPNODE  *ep;
{
    ACTIVATION  act;
    double  alist[ALISTSIZ];
    double  rval;
    register VARDEF  *dp;
                                        /* push environment */
    dp = resolve(ep->v.kid);
    act.name = dp->name;
    act.prev = curact;
    act.ap = alist;
    act.an = 0;
    act.fun = ep;
    curact = &act;

    if (dp->def == NULL || dp->def->v.kid->type != FUNC)
        rval = libfunc(act.name, dp);
    else
        rval = evalue(dp->def->v.kid->sibling);
    
    curact = act.prev;                  /* pop environment */
    return(rval);
}


LIBR *
liblookup(fname)                /* look up a library function */
char  *fname;
{
    int  upper, lower;
    register int  cm, i;

    lower = 0;
    upper = cm = libsize;

    while ((i = (lower + upper) >> 1) != cm) {
        cm = strcmp(fname, library[i].fname);
        if (cm > 0)
            lower = i;
        else if (cm < 0)
            upper = i;
        else
            return(&library[i]);
        cm = i;
    }
    return(NULL);
}


#ifndef  VARIABLE
VARDEF *
varinsert(vname)                /* dummy variable insert */
char  *vname;
{
    register VARDEF  *vp;

    vp = (VARDEF *)emalloc(sizeof(VARDEF));
    vp->name = savestr(vname);
    vp->nlinks = 1;
    vp->def = NULL;
    vp->lib = NULL;
    vp->next = NULL;
    return(vp);
}


varfree(vp)                     /* free dummy variable */
register VARDEF  *vp;
{
    freestr(vp->name);
    efree((char *)vp);
}
#endif


/*
 *  The following routines are for internal use:
 */


static double
libfunc(fname, vp)                      /* execute library function */
char  *fname;
register VARDEF  *vp;
{
    VARDEF  dumdef;
    double  d;
    int  lasterrno;

    if (vp == NULL) {
        vp = &dumdef;
        vp->lib = NULL;
    }
    if (((vp->lib == NULL || strcmp(fname, vp->lib->fname)) &&
                                (vp->lib = liblookup(fname)) == NULL) ||
                vp->lib->f == NULL) {
        eputs(fname);
        eputs(": undefined function\n");
        quit(1);
    }
    lasterrno = errno;
    errno = 0;
    d = (*vp->lib->f)(vp->lib->fname);
#ifdef  IEEE
    if (!finite(d))
        errno = EDOM;
#endif
    if (errno) {
        wputs(fname);
        wputs(": bad call\n");
        return(0.0);
    }
    errno = lasterrno;
    return(d);
}


/*
 *  Library functions:
 */


static double
l_if()                  /* if(cond, then, else) conditional expression */
                        /* cond evaluates true if greater than zero */
{
    if (argument(1) > 0.0)
        return(argument(2));
    else
        return(argument(3));
}


static double
l_select()              /* return argument #(A1+1) */
{
        register int  n;

        n = argument(1) + .5;
        if (n == 0)
                return(nargum()-1);
        if (n < 1 || n > nargum()-1) {
                errno = EDOM;
                return(0.0);
        }
        return(argument(n+1));
}


static double
l_rand()                /* random function between 0 and 1 */
{
    extern double  floor();
    double  x;

    x = argument(1);
    x *= 1.0/(1.0 + x*x) + 2.71828182845904;
    x += .785398163397447 - floor(x);
    x = 1e5 / x;
    return(x - floor(x));
}


static double
l_floor()               /* return largest integer not greater than arg1 */
{
    extern double  floor();

    return(floor(argument(1)));
}


static double
l_ceil()                /* return smallest integer not less than arg1 */
{
    extern double  ceil();

    return(ceil(argument(1)));
}


#ifdef  BIGLIB
static double
l_sqrt()
{
    extern double  sqrt();

    return(sqrt(argument(1)));
}


static double
l_sin()
{
    extern double  sin();

    return(sin(argument(1)));
}


static double
l_cos()
{
    extern double  cos();

    return(cos(argument(1)));
}


static double
l_tan()
{
    extern double  tan();

    return(tan(argument(1)));
}


static double
l_asin()
{
    extern double  asin();

    return(asin(argument(1)));
}


static double
l_acos()
{
    extern double  acos();

    return(acos(argument(1)));
}


static double
l_atan()
{
    extern double  atan();

    return(atan(argument(1)));
}


static double
l_atan2()
{
    extern double  atan2();

    return(atan2(argument(1), argument(2)));
}


static double
l_exp()
{
    extern double  exp();

    return(exp(argument(1)));
}


static double
l_log()
{
    extern double  log();

    return(log(argument(1)));
}


static double
l_log10()
{
    extern double  log10();

    return(log10(argument(1)));
}
#endif
Revision:	1.6
Committed:	Fri May 24 13:30:00 1991 UTC (32 years, 11 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.5:	+2 -2 lines
Log Message:	added function name to library calls
#	User	Rev	Content
1	greg	1.5	/* Copyright (c) 1991 Regents of the University of California */
2	greg	1.1
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* calfunc.c - routines for calcomp using functions.
9			*
10			* The define BIGLIB pulls in a large number of the
11			* available math routines.
12			*
13			* If VARIABLE is not defined, only library functions
14			* can be accessed.
15			*
16			* 4/2/86
17			*/
18
19			#include <stdio.h>
20
21			#include <errno.h>
22
23			#include "calcomp.h"
24
25	greg	1.5	/* bits in argument flag (better be right!) */
26			#define AFLAGSIZ (8*sizeof(unsigned long))
27	greg	1.1	#define ALISTSIZ 6 /* maximum saved argument list */
28
29			typedef struct activation {
30			char name; / function name */
31			struct activation prev; / previous activation */
32			double ap; / argument list */
33			unsigned long an; /* computed argument flags */
34			EPNODE fun; / argument function */
35			} ACTIVATION; /* an activation record */
36
37			static ACTIVATION *curact = NULL;
38
39	greg	1.2	static double libfunc();
40	greg	1.1
41			#define MAXLIB 64 /* maximum number of library functions */
42
43	greg	1.2	static double l_if(), l_select(), l_rand();
44			static double l_floor(), l_ceil();
45	greg	1.1	#ifdef BIGLIB
46	greg	1.2	static double l_sqrt();
47			static double l_sin(), l_cos(), l_tan();
48			static double l_asin(), l_acos(), l_atan(), l_atan2();
49			static double l_exp(), l_log(), l_log10();
50	greg	1.1	#endif
51
52			#ifdef BIGLIB
53			/* functions must be listed alphabetically */
54			static LIBR library[MAXLIB] = {
55	greg	1.4	{ "acos", 1, ':', l_acos },
56			{ "asin", 1, ':', l_asin },
57			{ "atan", 1, ':', l_atan },
58			{ "atan2", 2, ':', l_atan2 },
59			{ "ceil", 1, ':', l_ceil },
60			{ "cos", 1, ':', l_cos },
61			{ "exp", 1, ':', l_exp },
62			{ "floor", 1, ':', l_floor },
63			{ "if", 3, ':', l_if },
64			{ "log", 1, ':', l_log },
65			{ "log10", 1, ':', l_log10 },
66			{ "rand", 1, ':', l_rand },
67			{ "select", 1, ':', l_select },
68			{ "sin", 1, ':', l_sin },
69			{ "sqrt", 1, ':', l_sqrt },
70			{ "tan", 1, ':', l_tan },
71	greg	1.1	};
72
73			static int libsize = 16;
74
75			#else
76			/* functions must be listed alphabetically */
77			static LIBR library[MAXLIB] = {
78	greg	1.4	{ "ceil", 1, ':', l_ceil },
79			{ "floor", 1, ':', l_floor },
80			{ "if", 3, ':', l_if },
81			{ "rand", 1, ':', l_rand },
82			{ "select", 1, ':', l_select },
83	greg	1.1	};
84
85			static int libsize = 5;
86
87			#endif
88
89			extern char savestr(), emalloc();
90
91			extern LIBR *liblookup();
92
93			extern VARDEF *argf();
94
95			#ifdef VARIABLE
96			#define resolve(ep) ((ep)->type==VAR?(ep)->v.ln:argf((ep)->v.chan))
97			#else
98			#define resolve(ep) ((ep)->v.ln)
99			#define varlookup(name) NULL
100			#endif
101
102
103			int
104			fundefined(fname) /* return # of arguments for function */
105			char *fname;
106			{
107			LIBR *lp;
108			register VARDEF *vp;
109
110			if ((vp = varlookup(fname)) == NULL \|\| vp->def == NULL
111			\|\| vp->def->v.kid->type != FUNC)
112			if ((lp = liblookup(fname)) == NULL)
113			return(0);
114			else
115			return(lp->nargs);
116			else
117			return(nekids(vp->def->v.kid) - 1);
118			}
119
120
121			double
122			funvalue(fname, n, a) /* return a function value to the user */
123			char *fname;
124			int n;
125			double *a;
126			{
127			ACTIVATION act;
128			register VARDEF *vp;
129			double rval;
130			/* push environment */
131			act.name = fname;
132			act.prev = curact;
133			act.ap = a;
134	greg	1.5	if (n >= AFLAGSIZ)
135			act.an = ~0;
136			else
137			act.an = (1L<<n)-1;
138	greg	1.1	act.fun = NULL;
139			curact = &act;
140
141			if ((vp = varlookup(fname)) == NULL \|\| vp->def == NULL
142			\|\| vp->def->v.kid->type != FUNC)
143			rval = libfunc(fname, vp);
144			else
145			rval = evalue(vp->def->v.kid->sibling);
146
147			curact = act.prev; /* pop environment */
148			return(rval);
149			}
150
151
152	greg	1.4	funset(fname, nargs, assign, fptr) /* set a library function */
153	greg	1.1	char *fname;
154			int nargs;
155	greg	1.4	int assign;
156	greg	1.1	double (*fptr)();
157			{
158			register LIBR *lp;
159
160			if ((lp = liblookup(fname)) == NULL) {
161			if (libsize >= MAXLIB) {
162			eputs("Too many library functons!\n");
163			quit(1);
164			}
165			for (lp = &library[libsize]; lp > library; lp--)
166			if (strcmp(lp[-1].fname, fname) > 0) {
167			lp[0].fname = lp[-1].fname;
168			lp[0].nargs = lp[-1].nargs;
169	greg	1.4	lp[0].atyp = lp[-1].atyp;
170	greg	1.1	lp[0].f = lp[-1].f;
171			} else
172			break;
173			libsize++;
174			}
175	greg	1.6	lp[0].fname = fname; /* must be static! */
176	greg	1.1	lp[0].nargs = nargs;
177	greg	1.4	lp[0].atyp = assign;
178	greg	1.1	lp[0].f = fptr;
179			}
180
181
182			int
183			nargum() /* return number of available arguments */
184			{
185			register int n;
186
187			if (curact == NULL)
188			return(0);
189			if (curact->fun == NULL) {
190			for (n = 0; (1L<<n) & curact->an; n++)
191			;
192			return(n);
193			}
194			return(nekids(curact->fun) - 1);
195			}
196
197
198			double
199			argument(n) /* return nth argument for active function */
200			register int n;
201			{
202			register ACTIVATION *actp = curact;
203			EPNODE *ep;
204			double aval;
205
206			if (actp == NULL \|\| --n < 0) {
207			eputs("Bad call to argument!\n");
208			quit(1);
209			}
210			/* already computed? */
211	greg	1.5	if (n < AFLAGSIZ && 1L<<n & actp->an)
212	greg	1.1	return(actp->ap[n]);
213
214			if (actp->fun == NULL \|\| (ep = ekid(actp->fun, n+1)) == NULL) {
215			eputs(actp->name);
216			eputs(": too few arguments\n");
217			quit(1);
218			}
219			curact = actp->prev; /* pop environment */
220			aval = evalue(ep); /* compute argument */
221			curact = actp; /* push back environment */
222			if (n < ALISTSIZ) { /* save value */
223			actp->ap[n] = aval;
224			actp->an \|= 1L<<n;
225			}
226			return(aval);
227			}
228
229
230			#ifdef VARIABLE
231			VARDEF *
232			argf(n) /* return function def for nth argument */
233			int n;
234			{
235			register ACTIVATION *actp;
236			register EPNODE *ep;
237
238			for (actp = curact; actp != NULL; actp = actp->prev) {
239
240			if (n <= 0)
241			break;
242
243			if (actp->fun == NULL)
244			goto badarg;
245
246			if ((ep = ekid(actp->fun, n)) == NULL) {
247			eputs(actp->name);
248			eputs(": too few arguments\n");
249			quit(1);
250			}
251			if (ep->type == VAR)
252			return(ep->v.ln); /* found it */
253
254			if (ep->type != ARG)
255			goto badarg;
256
257			n = ep->v.chan; /* try previous context */
258			}
259			eputs("Bad call to argf!\n");
260			quit(1);
261
262			badarg:
263			eputs(actp->name);
264			eputs(": argument not a function\n");
265			quit(1);
266			}
267
268
269			char *
270			argfun(n) /* return function name for nth argument */
271			int n;
272			{
273			return(argf(n)->name);
274			}
275			#endif
276
277
278			double
279			efunc(ep) /* evaluate a function */
280			register EPNODE *ep;
281			{
282			ACTIVATION act;
283			double alist[ALISTSIZ];
284			double rval;
285			register VARDEF *dp;
286			/* push environment */
287			dp = resolve(ep->v.kid);
288			act.name = dp->name;
289			act.prev = curact;
290			act.ap = alist;
291			act.an = 0;
292			act.fun = ep;
293			curact = &act;
294
295			if (dp->def == NULL \|\| dp->def->v.kid->type != FUNC)
296			rval = libfunc(act.name, dp);
297			else
298			rval = evalue(dp->def->v.kid->sibling);
299
300			curact = act.prev; /* pop environment */
301			return(rval);
302			}
303
304
305			LIBR *
306			liblookup(fname) /* look up a library function */
307			char *fname;
308			{
309			int upper, lower;
310			register int cm, i;
311
312			lower = 0;
313			upper = cm = libsize;
314
315			while ((i = (lower + upper) >> 1) != cm) {
316			cm = strcmp(fname, library[i].fname);
317			if (cm > 0)
318			lower = i;
319			else if (cm < 0)
320			upper = i;
321			else
322			return(&library[i]);
323			cm = i;
324			}
325			return(NULL);
326			}
327
328
329			#ifndef VARIABLE
330			VARDEF *
331			varinsert(vname) /* dummy variable insert */
332			char *vname;
333			{
334			register VARDEF *vp;
335
336			vp = (VARDEF *)emalloc(sizeof(VARDEF));
337			vp->name = savestr(vname);
338			vp->nlinks = 1;
339			vp->def = NULL;
340			vp->lib = NULL;
341			vp->next = NULL;
342			return(vp);
343			}
344
345
346			varfree(vp) /* free dummy variable */
347			register VARDEF *vp;
348			{
349			freestr(vp->name);
350			efree((char *)vp);
351			}
352			#endif
353
354
355
356			/*
357			* The following routines are for internal use:
358			*/
359
360
361			static double
362			libfunc(fname, vp) /* execute library function */
363			char *fname;
364			register VARDEF *vp;
365			{
366			VARDEF dumdef;
367			double d;
368			int lasterrno;
369
370			if (vp == NULL) {
371			vp = &dumdef;
372			vp->lib = NULL;
373			}
374			if (((vp->lib == NULL \|\| strcmp(fname, vp->lib->fname)) &&
375			(vp->lib = liblookup(fname)) == NULL) \|\|
376			vp->lib->f == NULL) {
377			eputs(fname);
378			eputs(": undefined function\n");
379			quit(1);
380			}
381			lasterrno = errno;
382			errno = 0;
383	greg	1.6	d = (*vp->lib->f)(vp->lib->fname);
384	greg	1.1	#ifdef IEEE
385			if (!finite(d))
386			errno = EDOM;
387			#endif
388			if (errno) {
389			wputs(fname);
390			wputs(": bad call\n");
391			return(0.0);
392			}
393			errno = lasterrno;
394			return(d);
395			}
396
397
398			/*
399			* Library functions:
400			*/
401
402
403			static double
404			l_if() /* if(cond, then, else) conditional expression */
405			/* cond evaluates true if greater than zero */
406			{
407			if (argument(1) > 0.0)
408			return(argument(2));
409			else
410			return(argument(3));
411			}
412
413
414			static double
415			l_select() /* return argument #(A1+1) */
416			{
417			register int n;
418
419			n = argument(1) + .5;
420			if (n == 0)
421			return(nargum()-1);
422			if (n < 1 \|\| n > nargum()-1) {
423			errno = EDOM;
424			return(0.0);
425			}
426			return(argument(n+1));
427			}
428
429
430			static double
431			l_rand() /* random function between 0 and 1 */
432			{
433			extern double floor();
434			double x;
435
436			x = argument(1);
437			x = 1.0/(1.0 + xx) + 2.71828182845904;
438			x += .785398163397447 - floor(x);
439			x = 1e5 / x;
440			return(x - floor(x));
441			}
442
443
444			static double
445			l_floor() /* return largest integer not greater than arg1 */
446			{
447			extern double floor();
448
449			return(floor(argument(1)));
450			}
451
452
453			static double
454			l_ceil() /* return smallest integer not less than arg1 */
455			{
456			extern double ceil();
457
458			return(ceil(argument(1)));
459			}
460
461
462			#ifdef BIGLIB
463			static double
464			l_sqrt()
465			{
466			extern double sqrt();
467
468			return(sqrt(argument(1)));
469			}
470
471
472			static double
473			l_sin()
474			{
475			extern double sin();
476
477			return(sin(argument(1)));
478			}
479
480
481			static double
482			l_cos()
483			{
484			extern double cos();
485
486			return(cos(argument(1)));
487			}
488
489
490			static double
491			l_tan()
492			{
493			extern double tan();
494
495			return(tan(argument(1)));
496			}
497
498
499			static double
500			l_asin()
501			{
502			extern double asin();
503
504			return(asin(argument(1)));
505			}
506
507
508			static double
509			l_acos()
510			{
511			extern double acos();
512
513			return(acos(argument(1)));
514			}
515
516
517			static double
518			l_atan()
519			{
520			extern double atan();
521
522			return(atan(argument(1)));
523			}
524
525
526			static double
527			l_atan2()
528			{
529			extern double atan2();
530
531			return(atan2(argument(1), argument(2)));
532			}
533
534
535			static double
536			l_exp()
537			{
538			extern double exp();
539
540			return(exp(argument(1)));
541			}
542
543
544			static double
545			l_log()
546			{
547			extern double log();
548
549			return(log(argument(1)));
550			}
551
552
553			static double
554			l_log10()
555			{
556			extern double log10();
557
558			return(log10(argument(1)));
559			}
560			#endif