src/common/calfunc.c

#ifndef lint
static const char       RCSid[] = "$Id: calfunc.c,v 2.17 2013/04/20 02:31:41 greg Exp $";
#endif
/*
 *  calfunc.c - routines for calcomp using functions.
 *
 *      If VARIABLE is not set, only library functions
 *  can be accessed.
 *
 *  2/19/03     Eliminated conditional compiles in favor of esupport extern.
 */

#include "copyright.h"

#include  <stdio.h>
#include  <string.h>
#include  <errno.h>
#include  <math.h>

#include  "rterror.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(char *fname, VARDEF *vp);

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

static double  l_if(char *), l_select(char *), l_rand(char *);
static double  l_floor(char *), l_ceil(char *);
static double  l_sqrt(char *);
static double  l_sin(char *), l_cos(char *), l_tan(char *);
static double  l_asin(char *), l_acos(char *), l_atan(char *), l_atan2(char *);
static double  l_exp(char *), l_log(char *), l_log10(char *);

                        /* 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;

#define  resolve(ep)    ((ep)->type==VAR?(ep)->v.ln:argf((ep)->v.chan))


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

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


double
funvalue(                       /* return a function value to the user */
        char  *fname,
        int  n,
        double  *a
)
{
    ACTIVATION  act;
    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);
}


void
funset(                         /* set a library function */
        char  *fname,
        int  nargs,
        int  assign,
        double  (*fptr)(char *)
)
{
    int  oldlibsize = libsize;
    char *cp;
    LIBR  *lp;
                                                /* check for context */
    for (cp = fname; *cp; cp++)
        ;
    if (cp == fname)
        return;
    if (cp[-1] == CNTXMARK)
        *--cp = '\0';
    if ((lp = liblookup(fname)) == NULL) {      /* insert */
        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] = lp[-1];
            else
                break;
        libsize++;
    }
    if (fptr == NULL) {                         /* delete */
        while (lp < &library[libsize-1]) {
            lp[0] = lp[1];
            lp++;
        }
        libsize--;
    } else {                                    /* or assign */
        lp[0].fname = fname;            /* string must be static! */
        lp[0].nargs = nargs;
        lp[0].atyp = assign;
        lp[0].f = fptr;
    }
    if (libsize != oldlibsize)
        libupdate(fname);                       /* relink library */
}


int
nargum(void)                    /* return number of available arguments */
{
    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(int n)                 /* return nth argument for active function */
{
    ACTIVATION  *actp = curact;
    EPNODE  *ep = NULL;
    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);
}


VARDEF *
argf(int n)                     /* return function def for nth argument */
{
    ACTIVATION  *actp;
    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);
        return NULL; /* pro forma return */
}


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


double
efunc(EPNODE *ep)                       /* evaluate a function */
{
    ACTIVATION  act;
    double  alist[ALISTSIZ];
    double  rval;
    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(char *fname)          /* look up a library function */
{
    int  upper, lower;
    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);
}


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


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

    if (vp != NULL)
        lp = vp->lib;
    else
        lp = liblookup(fname);
    if (lp == NULL) {
        eputs(fname);
        eputs(": undefined function\n");
        quit(1);
    }
    lasterrno = errno;
    errno = 0;
    d = (*lp->f)(lp->fname);
#ifdef  isnan
    if (errno == 0) {
        if (isnan(d))
            errno = EDOM;
        else if (isinf(d))
            errno = ERANGE;
    }
#endif
    if (errno == EDOM || errno == ERANGE) {
        wputs(fname);
        if (errno == EDOM)
                wputs(": domain error\n");
        else if (errno == ERANGE)
                wputs(": range error\n");
        else
                wputs(": error in call\n");
        return(0.0);
    }
    errno = lasterrno;
    return(d);
}


/*
 *  Library functions:
 */


static double
l_if(char *nm)          /* 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(char *nm)      /* return argument #(A1+1) */
{
        int  n;

        n = (int)(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(char *nm)                /* random function between 0 and 1 */
{
    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(char *nm)               /* return largest integer not greater than arg1 */
{
    return(floor(argument(1)));
}


static double
l_ceil(char *nm)                /* return smallest integer not less than arg1 */
{
    return(ceil(argument(1)));
}


static double
l_sqrt(char *nm)
{
    return(sqrt(argument(1)));
}


static double
l_sin(char *nm)
{
    return(sin(argument(1)));
}


static double
l_cos(char *nm)
{
    return(cos(argument(1)));
}


static double
l_tan(char *nm)
{
    return(tan(argument(1)));
}


static double
l_asin(char *nm)
{
    return(asin(argument(1)));
}


static double
l_acos(char *nm)
{
    return(acos(argument(1)));
}


static double
l_atan(char *nm)
{
    return(atan(argument(1)));
}


static double
l_atan2(char *nm)
{
    return(atan2(argument(1), argument(2)));
}


static double
l_exp(char *nm)
{
    return(exp(argument(1)));
}


static double
l_log(char *nm)
{
    return(log(argument(1)));
}


static double
l_log10(char *nm)
{
    return(log10(argument(1)));
}
Revision:	2.18
Committed:	Sat Aug 1 23:27:04 2015 UTC (8 years, 9 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad5R2, rad5R0, rad5R1
Changes since 2.17:	+3 -2 lines
Log Message:	Fixed various compiler warnings (mostly harmless)
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.18	static const char RCSid[] = "$Id: calfunc.c,v 2.17 2013/04/20 02:31:41 greg Exp $";
3	greg	1.1	#endif
4			/*
5			* calfunc.c - routines for calcomp using functions.
6			*
7	greg	2.8	* If VARIABLE is not set, only library functions
8			* can be accessed.
9			*
10			* 2/19/03 Eliminated conditional compiles in favor of esupport extern.
11			*/
12
13	greg	2.9	#include "copyright.h"
14	greg	1.1
15			#include <stdio.h>
16	schorsch	2.11	#include <string.h>
17	greg	1.1	#include <errno.h>
18	greg	2.5	#include <math.h>
19
20	schorsch	2.12	#include "rterror.h"
21	greg	1.1	#include "calcomp.h"
22
23	greg	1.5	/* bits in argument flag (better be right!) */
24			#define AFLAGSIZ (8*sizeof(unsigned long))
25	greg	1.1	#define ALISTSIZ 6 /* maximum saved argument list */
26
27			typedef struct activation {
28			char name; / function name */
29			struct activation prev; / previous activation */
30			double ap; / argument list */
31			unsigned long an; /* computed argument flags */
32			EPNODE fun; / argument function */
33			} ACTIVATION; /* an activation record */
34
35			static ACTIVATION *curact = NULL;
36
37	schorsch	2.12	static double libfunc(char fname, VARDEF vp);
38	greg	1.1
39	greg	2.8	#ifndef MAXLIB
40	greg	1.1	#define MAXLIB 64 /* maximum number of library functions */
41	greg	2.8	#endif
42	greg	1.1
43	greg	2.13	static double l_if(char ), l_select(char ), l_rand(char *);
44			static double l_floor(char ), l_ceil(char );
45			static double l_sqrt(char *);
46			static double l_sin(char ), l_cos(char ), l_tan(char *);
47			static double l_asin(char ), l_acos(char ), l_atan(char ), l_atan2(char );
48			static double l_exp(char ), l_log(char ), l_log10(char *);
49	greg	1.1
50			/* functions must be listed alphabetically */
51			static LIBR library[MAXLIB] = {
52	greg	1.4	{ "acos", 1, ':', l_acos },
53			{ "asin", 1, ':', l_asin },
54			{ "atan", 1, ':', l_atan },
55			{ "atan2", 2, ':', l_atan2 },
56			{ "ceil", 1, ':', l_ceil },
57			{ "cos", 1, ':', l_cos },
58			{ "exp", 1, ':', l_exp },
59			{ "floor", 1, ':', l_floor },
60			{ "if", 3, ':', l_if },
61			{ "log", 1, ':', l_log },
62			{ "log10", 1, ':', l_log10 },
63			{ "rand", 1, ':', l_rand },
64			{ "select", 1, ':', l_select },
65			{ "sin", 1, ':', l_sin },
66			{ "sqrt", 1, ':', l_sqrt },
67			{ "tan", 1, ':', l_tan },
68	greg	1.1	};
69
70			static int libsize = 16;
71
72			#define resolve(ep) ((ep)->type==VAR?(ep)->v.ln:argf((ep)->v.chan))
73
74
75			int
76	greg	2.16	fundefined( /* return # of arguments for function */
77			char *fname
78			)
79	greg	1.1	{
80	greg	2.16	LIBR *lp;
81			VARDEF *vp;
82	greg	1.1
83	greg	2.7	if ((vp = varlookup(fname)) != NULL && vp->def != NULL
84			&& vp->def->v.kid->type == FUNC)
85	greg	1.1	return(nekids(vp->def->v.kid) - 1);
86	greg	2.7	lp = vp != NULL ? vp->lib : liblookup(fname);
87			if (lp == NULL)
88			return(0);
89			return(lp->nargs);
90	greg	1.1	}
91
92
93			double
94	greg	2.16	funvalue( /* return a function value to the user */
95			char *fname,
96			int n,
97			double *a
98			)
99	greg	1.1	{
100			ACTIVATION act;
101	greg	2.16	VARDEF *vp;
102	greg	1.1	double rval;
103			/* push environment */
104			act.name = fname;
105			act.prev = curact;
106			act.ap = a;
107	greg	1.5	if (n >= AFLAGSIZ)
108			act.an = ~0;
109			else
110			act.an = (1L<<n)-1;
111	greg	1.1	act.fun = NULL;
112			curact = &act;
113
114			if ((vp = varlookup(fname)) == NULL \|\| vp->def == NULL
115			\|\| vp->def->v.kid->type != FUNC)
116			rval = libfunc(fname, vp);
117			else
118			rval = evalue(vp->def->v.kid->sibling);
119
120			curact = act.prev; /* pop environment */
121			return(rval);
122			}
123
124
125	greg	2.8	void
126	greg	2.16	funset( /* set a library function */
127			char *fname,
128			int nargs,
129			int assign,
130			double (fptr)(char )
131			)
132	greg	1.1	{
133	greg	2.6	int oldlibsize = libsize;
134	greg	2.8	char *cp;
135	greg	2.16	LIBR *lp;
136	greg	2.8	/* check for context */
137			for (cp = fname; *cp; cp++)
138			;
139			if (cp == fname)
140			return;
141			if (cp[-1] == CNTXMARK)
142			*--cp = '\0';
143	greg	2.2	if ((lp = liblookup(fname)) == NULL) { /* insert */
144	greg	1.1	if (libsize >= MAXLIB) {
145			eputs("Too many library functons!\n");
146			quit(1);
147			}
148			for (lp = &library[libsize]; lp > library; lp--)
149	greg	2.17	if (strcmp(lp[-1].fname, fname) > 0)
150			lp[0] = lp[-1];
151			else
152	greg	1.1	break;
153			libsize++;
154			}
155	greg	2.2	if (fptr == NULL) { /* delete */
156			while (lp < &library[libsize-1]) {
157	greg	2.17	lp[0] = lp[1];
158	greg	2.2	lp++;
159			}
160			libsize--;
161			} else { /* or assign */
162			lp[0].fname = fname; /* string must be static! */
163			lp[0].nargs = nargs;
164			lp[0].atyp = assign;
165			lp[0].f = fptr;
166			}
167	greg	2.6	if (libsize != oldlibsize)
168			libupdate(fname); /* relink library */
169	greg	1.1	}
170
171
172			int
173	greg	2.16	nargum(void) /* return number of available arguments */
174	greg	1.1	{
175	greg	2.16	int n;
176	greg	1.1
177			if (curact == NULL)
178			return(0);
179			if (curact->fun == NULL) {
180			for (n = 0; (1L<<n) & curact->an; n++)
181			;
182			return(n);
183			}
184			return(nekids(curact->fun) - 1);
185			}
186
187
188			double
189	greg	2.16	argument(int n) /* return nth argument for active function */
190	greg	1.1	{
191	greg	2.16	ACTIVATION *actp = curact;
192			EPNODE *ep = NULL;
193	greg	1.1	double aval;
194
195			if (actp == NULL \|\| --n < 0) {
196			eputs("Bad call to argument!\n");
197			quit(1);
198			}
199			/* already computed? */
200	greg	1.5	if (n < AFLAGSIZ && 1L<<n & actp->an)
201	greg	1.1	return(actp->ap[n]);
202
203			if (actp->fun == NULL \|\| (ep = ekid(actp->fun, n+1)) == NULL) {
204			eputs(actp->name);
205			eputs(": too few arguments\n");
206			quit(1);
207			}
208			curact = actp->prev; /* pop environment */
209			aval = evalue(ep); /* compute argument */
210			curact = actp; /* push back environment */
211			if (n < ALISTSIZ) { /* save value */
212			actp->ap[n] = aval;
213			actp->an \|= 1L<<n;
214			}
215			return(aval);
216			}
217
218
219			VARDEF *
220	greg	2.16	argf(int n) /* return function def for nth argument */
221	greg	1.1	{
222	greg	2.16	ACTIVATION *actp;
223			EPNODE *ep;
224	greg	1.1
225			for (actp = curact; actp != NULL; actp = actp->prev) {
226
227			if (n <= 0)
228			break;
229
230			if (actp->fun == NULL)
231			goto badarg;
232
233			if ((ep = ekid(actp->fun, n)) == NULL) {
234			eputs(actp->name);
235			eputs(": too few arguments\n");
236			quit(1);
237			}
238			if (ep->type == VAR)
239			return(ep->v.ln); /* found it */
240
241			if (ep->type != ARG)
242			goto badarg;
243
244			n = ep->v.chan; /* try previous context */
245			}
246			eputs("Bad call to argf!\n");
247			quit(1);
248
249			badarg:
250			eputs(actp->name);
251			eputs(": argument not a function\n");
252			quit(1);
253	schorsch	2.11	return NULL; /* pro forma return */
254	greg	1.1	}
255
256
257			char *
258	greg	2.16	argfun(int n) /* return function name for nth argument */
259	greg	1.1	{
260			return(argf(n)->name);
261			}
262
263
264			double
265	greg	2.16	efunc(EPNODE ep) / evaluate a function */
266	greg	1.1	{
267			ACTIVATION act;
268			double alist[ALISTSIZ];
269			double rval;
270	greg	2.16	VARDEF *dp;
271	greg	1.1	/* push environment */
272			dp = resolve(ep->v.kid);
273			act.name = dp->name;
274			act.prev = curact;
275			act.ap = alist;
276			act.an = 0;
277			act.fun = ep;
278			curact = &act;
279
280			if (dp->def == NULL \|\| dp->def->v.kid->type != FUNC)
281			rval = libfunc(act.name, dp);
282			else
283			rval = evalue(dp->def->v.kid->sibling);
284
285			curact = act.prev; /* pop environment */
286			return(rval);
287			}
288
289
290			LIBR *
291	greg	2.16	liblookup(char fname) / look up a library function */
292	greg	1.1	{
293			int upper, lower;
294	greg	2.16	int cm, i;
295	greg	1.1
296			lower = 0;
297			upper = cm = libsize;
298
299			while ((i = (lower + upper) >> 1) != cm) {
300			cm = strcmp(fname, library[i].fname);
301			if (cm > 0)
302			lower = i;
303			else if (cm < 0)
304			upper = i;
305			else
306			return(&library[i]);
307			cm = i;
308			}
309			return(NULL);
310			}
311
312
313			/*
314			* The following routines are for internal use:
315			*/
316
317
318			static double
319	greg	2.16	libfunc( /* execute library function */
320			char *fname,
321			VARDEF *vp
322			)
323	greg	1.1	{
324	greg	2.16	LIBR *lp;
325	greg	1.1	double d;
326			int lasterrno;
327
328	greg	2.3	if (vp != NULL)
329			lp = vp->lib;
330			else
331			lp = liblookup(fname);
332			if (lp == NULL) {
333	greg	1.1	eputs(fname);
334			eputs(": undefined function\n");
335			quit(1);
336			}
337			lasterrno = errno;
338			errno = 0;
339	greg	2.3	d = (*lp->f)(lp->fname);
340	greg	2.15	#ifdef isnan
341	greg	2.18	if (errno == 0) {
342	greg	1.9	if (isnan(d))
343			errno = EDOM;
344			else if (isinf(d))
345			errno = ERANGE;
346	greg	2.18	}
347	greg	1.1	#endif
348	greg	2.10	if (errno == EDOM \|\| errno == ERANGE) {
349	greg	1.1	wputs(fname);
350	greg	1.8	if (errno == EDOM)
351			wputs(": domain error\n");
352			else if (errno == ERANGE)
353			wputs(": range error\n");
354			else
355			wputs(": error in call\n");
356	greg	1.1	return(0.0);
357			}
358			errno = lasterrno;
359			return(d);
360			}
361
362
363			/*
364			* Library functions:
365			*/
366
367
368			static double
369	greg	2.13	l_if(char nm) / if(cond, then, else) conditional expression */
370	greg	1.1	/* cond evaluates true if greater than zero */
371			{
372			if (argument(1) > 0.0)
373			return(argument(2));
374			else
375			return(argument(3));
376			}
377
378
379			static double
380	greg	2.13	l_select(char nm) / return argument #(A1+1) */
381	greg	1.1	{
382	greg	2.16	int n;
383	greg	1.1
384	schorsch	2.11	n = (int)(argument(1) + .5);
385	greg	1.1	if (n == 0)
386			return(nargum()-1);
387			if (n < 1 \|\| n > nargum()-1) {
388			errno = EDOM;
389			return(0.0);
390			}
391			return(argument(n+1));
392			}
393
394
395			static double
396	greg	2.13	l_rand(char nm) / random function between 0 and 1 */
397	greg	1.1	{
398			double x;
399
400			x = argument(1);
401			x = 1.0/(1.0 + xx) + 2.71828182845904;
402			x += .785398163397447 - floor(x);
403			x = 1e5 / x;
404			return(x - floor(x));
405			}
406
407
408			static double
409	greg	2.13	l_floor(char nm) / return largest integer not greater than arg1 */
410	greg	1.1	{
411			return(floor(argument(1)));
412			}
413
414
415			static double
416	greg	2.13	l_ceil(char nm) / return smallest integer not less than arg1 */
417	greg	1.1	{
418			return(ceil(argument(1)));
419			}
420
421
422			static double
423	greg	2.13	l_sqrt(char *nm)
424	greg	1.1	{
425			return(sqrt(argument(1)));
426			}
427
428
429			static double
430	greg	2.13	l_sin(char *nm)
431	greg	1.1	{
432			return(sin(argument(1)));
433			}
434
435
436			static double
437	greg	2.13	l_cos(char *nm)
438	greg	1.1	{
439			return(cos(argument(1)));
440			}
441
442
443			static double
444	greg	2.13	l_tan(char *nm)
445	greg	1.1	{
446			return(tan(argument(1)));
447			}
448
449
450			static double
451	greg	2.13	l_asin(char *nm)
452	greg	1.1	{
453			return(asin(argument(1)));
454			}
455
456
457			static double
458	greg	2.13	l_acos(char *nm)
459	greg	1.1	{
460			return(acos(argument(1)));
461			}
462
463
464			static double
465	greg	2.13	l_atan(char *nm)
466	greg	1.1	{
467			return(atan(argument(1)));
468			}
469
470
471			static double
472	greg	2.13	l_atan2(char *nm)
473	greg	1.1	{
474			return(atan2(argument(1), argument(2)));
475			}
476
477
478			static double
479	greg	2.13	l_exp(char *nm)
480	greg	1.1	{
481			return(exp(argument(1)));
482			}
483
484
485			static double
486	greg	2.13	l_log(char *nm)
487	greg	1.1	{
488			return(log(argument(1)));
489			}
490
491
492			static double
493	greg	2.13	l_log10(char *nm)
494	greg	1.1	{
495			return(log10(argument(1)));
496			}