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  <math.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 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) {      /* 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].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++;
    }
    if (fptr == NULL) {                         /* delete */
        while (lp < &library[libsize-1]) {
            lp[0].fname = lp[1].fname;
            lp[0].nargs = lp[1].nargs;
            lp[0].atyp = lp[1].atyp;
            lp[0].f = lp[1].f;
            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;
    }
    libupdate(fname);                   /* relink library */
}


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;
    register 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
static VARDEF  *varlist = NULL;         /* our list of dummy variables */


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 = liblookup(vname);
    vp->next = varlist;
    varlist = vp;
    return(vp);
}


varfree(vp)                     /* free dummy variable */
register VARDEF  *vp;
{
    register VARDEF  *vp2;

    if (vp == varlist)
        varlist = vp->next;
    else {
        for (vp2 = varlist; vp2->next != vp; vp2 = vp2->next)
                ;
        vp2->next = vp->next;
    }
    freestr(vp->name);
    efree((char *)vp);
}


libupdate(nm)                   /* update library */
char  *nm;
{
    register VARDEF  *vp;

    for (vp = varlist; vp != NULL; vp = vp->next)
        vp->lib = liblookup(vp->name);
}
#endif


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


static double
libfunc(fname, vp)                      /* execute library function */
char  *fname;
VARDEF  *vp;
{
    register 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  IEEE
    if (errno == 0)
        if (isnan(d))
            errno = EDOM;
        else if (isinf(d))
            errno = ERANGE;
#endif
    if (errno) {
        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()                  /* 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 */
{
    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 */
{
    return(floor(argument(1)));
}


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


#ifdef  BIGLIB
static double
l_sqrt()
{
    return(sqrt(argument(1)));
}


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


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


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


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


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


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


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


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


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


static double
l_log10()
{
    return(log10(argument(1)));
}
#endif
Revision:	2.5
Committed:	Fri Oct 2 15:58:31 1992 UTC (31 years, 7 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.4:	+2 -27 lines
Log Message:	Removed problematic math function declarations
#	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	greg	2.5	#include <math.h>
24
25	greg	1.1	#include "calcomp.h"
26
27	greg	1.5	/* bits in argument flag (better be right!) */
28			#define AFLAGSIZ (8*sizeof(unsigned long))
29	greg	1.1	#define ALISTSIZ 6 /* maximum saved argument list */
30
31			typedef struct activation {
32			char name; / function name */
33			struct activation prev; / previous activation */
34			double ap; / argument list */
35			unsigned long an; /* computed argument flags */
36			EPNODE fun; / argument function */
37			} ACTIVATION; /* an activation record */
38
39			static ACTIVATION *curact = NULL;
40
41	greg	1.2	static double libfunc();
42	greg	1.1
43			#define MAXLIB 64 /* maximum number of library functions */
44
45	greg	1.2	static double l_if(), l_select(), l_rand();
46			static double l_floor(), l_ceil();
47	greg	1.1	#ifdef BIGLIB
48	greg	1.2	static double l_sqrt();
49			static double l_sin(), l_cos(), l_tan();
50			static double l_asin(), l_acos(), l_atan(), l_atan2();
51			static double l_exp(), l_log(), l_log10();
52	greg	1.1	#endif
53
54			#ifdef BIGLIB
55			/* functions must be listed alphabetically */
56			static LIBR library[MAXLIB] = {
57	greg	1.4	{ "acos", 1, ':', l_acos },
58			{ "asin", 1, ':', l_asin },
59			{ "atan", 1, ':', l_atan },
60			{ "atan2", 2, ':', l_atan2 },
61			{ "ceil", 1, ':', l_ceil },
62			{ "cos", 1, ':', l_cos },
63			{ "exp", 1, ':', l_exp },
64			{ "floor", 1, ':', l_floor },
65			{ "if", 3, ':', l_if },
66			{ "log", 1, ':', l_log },
67			{ "log10", 1, ':', l_log10 },
68			{ "rand", 1, ':', l_rand },
69			{ "select", 1, ':', l_select },
70			{ "sin", 1, ':', l_sin },
71			{ "sqrt", 1, ':', l_sqrt },
72			{ "tan", 1, ':', l_tan },
73	greg	1.1	};
74
75			static int libsize = 16;
76
77			#else
78			/* functions must be listed alphabetically */
79			static LIBR library[MAXLIB] = {
80	greg	1.4	{ "ceil", 1, ':', l_ceil },
81			{ "floor", 1, ':', l_floor },
82			{ "if", 3, ':', l_if },
83			{ "rand", 1, ':', l_rand },
84			{ "select", 1, ':', l_select },
85	greg	1.1	};
86
87			static int libsize = 5;
88
89			#endif
90
91			extern char savestr(), emalloc();
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	greg	2.2	if ((lp = liblookup(fname)) == NULL) { /* insert */
161	greg	1.1	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	2.2	if (fptr == NULL) { /* delete */
176			while (lp < &library[libsize-1]) {
177			lp[0].fname = lp[1].fname;
178			lp[0].nargs = lp[1].nargs;
179			lp[0].atyp = lp[1].atyp;
180			lp[0].f = lp[1].f;
181			lp++;
182			}
183			libsize--;
184			} else { /* or assign */
185			lp[0].fname = fname; /* string must be static! */
186			lp[0].nargs = nargs;
187			lp[0].atyp = assign;
188			lp[0].f = fptr;
189			}
190			libupdate(fname); /* relink library */
191	greg	1.1	}
192
193
194			int
195			nargum() /* return number of available arguments */
196			{
197			register int n;
198
199			if (curact == NULL)
200			return(0);
201			if (curact->fun == NULL) {
202			for (n = 0; (1L<<n) & curact->an; n++)
203			;
204			return(n);
205			}
206			return(nekids(curact->fun) - 1);
207			}
208
209
210			double
211			argument(n) /* return nth argument for active function */
212			register int n;
213			{
214			register ACTIVATION *actp = curact;
215	greg	1.7	register EPNODE *ep;
216	greg	1.1	double aval;
217
218			if (actp == NULL \|\| --n < 0) {
219			eputs("Bad call to argument!\n");
220			quit(1);
221			}
222			/* already computed? */
223	greg	1.5	if (n < AFLAGSIZ && 1L<<n & actp->an)
224	greg	1.1	return(actp->ap[n]);
225
226			if (actp->fun == NULL \|\| (ep = ekid(actp->fun, n+1)) == NULL) {
227			eputs(actp->name);
228			eputs(": too few arguments\n");
229			quit(1);
230			}
231			curact = actp->prev; /* pop environment */
232			aval = evalue(ep); /* compute argument */
233			curact = actp; /* push back environment */
234			if (n < ALISTSIZ) { /* save value */
235			actp->ap[n] = aval;
236			actp->an \|= 1L<<n;
237			}
238			return(aval);
239			}
240
241
242			#ifdef VARIABLE
243			VARDEF *
244			argf(n) /* return function def for nth argument */
245			int n;
246			{
247			register ACTIVATION *actp;
248			register EPNODE *ep;
249
250			for (actp = curact; actp != NULL; actp = actp->prev) {
251
252			if (n <= 0)
253			break;
254
255			if (actp->fun == NULL)
256			goto badarg;
257
258			if ((ep = ekid(actp->fun, n)) == NULL) {
259			eputs(actp->name);
260			eputs(": too few arguments\n");
261			quit(1);
262			}
263			if (ep->type == VAR)
264			return(ep->v.ln); /* found it */
265
266			if (ep->type != ARG)
267			goto badarg;
268
269			n = ep->v.chan; /* try previous context */
270			}
271			eputs("Bad call to argf!\n");
272			quit(1);
273
274			badarg:
275			eputs(actp->name);
276			eputs(": argument not a function\n");
277			quit(1);
278			}
279
280
281			char *
282			argfun(n) /* return function name for nth argument */
283			int n;
284			{
285			return(argf(n)->name);
286			}
287			#endif
288
289
290			double
291			efunc(ep) /* evaluate a function */
292			register EPNODE *ep;
293			{
294			ACTIVATION act;
295			double alist[ALISTSIZ];
296			double rval;
297			register VARDEF *dp;
298			/* push environment */
299			dp = resolve(ep->v.kid);
300			act.name = dp->name;
301			act.prev = curact;
302			act.ap = alist;
303			act.an = 0;
304			act.fun = ep;
305			curact = &act;
306
307			if (dp->def == NULL \|\| dp->def->v.kid->type != FUNC)
308			rval = libfunc(act.name, dp);
309			else
310			rval = evalue(dp->def->v.kid->sibling);
311
312			curact = act.prev; /* pop environment */
313			return(rval);
314			}
315
316
317			LIBR *
318			liblookup(fname) /* look up a library function */
319			char *fname;
320			{
321			int upper, lower;
322			register int cm, i;
323
324			lower = 0;
325			upper = cm = libsize;
326
327			while ((i = (lower + upper) >> 1) != cm) {
328			cm = strcmp(fname, library[i].fname);
329			if (cm > 0)
330			lower = i;
331			else if (cm < 0)
332			upper = i;
333			else
334			return(&library[i]);
335			cm = i;
336			}
337			return(NULL);
338			}
339
340
341			#ifndef VARIABLE
342	greg	2.4	static VARDEF varlist = NULL; / our list of dummy variables */
343
344
345	greg	1.1	VARDEF *
346			varinsert(vname) /* dummy variable insert */
347			char *vname;
348			{
349			register VARDEF *vp;
350
351			vp = (VARDEF *)emalloc(sizeof(VARDEF));
352			vp->name = savestr(vname);
353			vp->nlinks = 1;
354			vp->def = NULL;
355	greg	2.4	vp->lib = liblookup(vname);
356			vp->next = varlist;
357			varlist = vp;
358	greg	1.1	return(vp);
359			}
360
361
362			varfree(vp) /* free dummy variable */
363			register VARDEF *vp;
364			{
365	greg	2.4	register VARDEF *vp2;
366
367			if (vp == varlist)
368			varlist = vp->next;
369			else {
370			for (vp2 = varlist; vp2->next != vp; vp2 = vp2->next)
371			;
372			vp2->next = vp->next;
373			}
374	greg	1.1	freestr(vp->name);
375			efree((char *)vp);
376	greg	2.4	}
377
378
379			libupdate(nm) /* update library */
380			char *nm;
381			{
382			register VARDEF *vp;
383
384			for (vp = varlist; vp != NULL; vp = vp->next)
385			vp->lib = liblookup(vp->name);
386	greg	1.1	}
387			#endif
388
389
390
391			/*
392			* The following routines are for internal use:
393			*/
394
395
396			static double
397			libfunc(fname, vp) /* execute library function */
398			char *fname;
399	greg	2.3	VARDEF *vp;
400	greg	1.1	{
401	greg	2.3	register LIBR *lp;
402	greg	1.1	double d;
403			int lasterrno;
404
405	greg	2.3	if (vp != NULL)
406			lp = vp->lib;
407			else
408			lp = liblookup(fname);
409			if (lp == NULL) {
410	greg	1.1	eputs(fname);
411			eputs(": undefined function\n");
412			quit(1);
413			}
414			lasterrno = errno;
415			errno = 0;
416	greg	2.3	d = (*lp->f)(lp->fname);
417	greg	1.1	#ifdef IEEE
418	greg	1.9	if (errno == 0)
419			if (isnan(d))
420			errno = EDOM;
421			else if (isinf(d))
422			errno = ERANGE;
423	greg	1.1	#endif
424			if (errno) {
425			wputs(fname);
426	greg	1.8	if (errno == EDOM)
427			wputs(": domain error\n");
428			else if (errno == ERANGE)
429			wputs(": range error\n");
430			else
431			wputs(": error in call\n");
432	greg	1.1	return(0.0);
433			}
434			errno = lasterrno;
435			return(d);
436			}
437
438
439			/*
440			* Library functions:
441			*/
442
443
444			static double
445			l_if() /* if(cond, then, else) conditional expression */
446			/* cond evaluates true if greater than zero */
447			{
448			if (argument(1) > 0.0)
449			return(argument(2));
450			else
451			return(argument(3));
452			}
453
454
455			static double
456			l_select() /* return argument #(A1+1) */
457			{
458			register int n;
459
460			n = argument(1) + .5;
461			if (n == 0)
462			return(nargum()-1);
463			if (n < 1 \|\| n > nargum()-1) {
464			errno = EDOM;
465			return(0.0);
466			}
467			return(argument(n+1));
468			}
469
470
471			static double
472			l_rand() /* random function between 0 and 1 */
473			{
474			double x;
475
476			x = argument(1);
477			x = 1.0/(1.0 + xx) + 2.71828182845904;
478			x += .785398163397447 - floor(x);
479			x = 1e5 / x;
480			return(x - floor(x));
481			}
482
483
484			static double
485			l_floor() /* return largest integer not greater than arg1 */
486			{
487			return(floor(argument(1)));
488			}
489
490
491			static double
492			l_ceil() /* return smallest integer not less than arg1 */
493			{
494			return(ceil(argument(1)));
495			}
496
497
498			#ifdef BIGLIB
499			static double
500			l_sqrt()
501			{
502			return(sqrt(argument(1)));
503			}
504
505
506			static double
507			l_sin()
508			{
509			return(sin(argument(1)));
510			}
511
512
513			static double
514			l_cos()
515			{
516			return(cos(argument(1)));
517			}
518
519
520			static double
521			l_tan()
522			{
523			return(tan(argument(1)));
524			}
525
526
527			static double
528			l_asin()
529			{
530			return(asin(argument(1)));
531			}
532
533
534			static double
535			l_acos()
536			{
537			return(acos(argument(1)));
538			}
539
540
541			static double
542			l_atan()
543			{
544			return(atan(argument(1)));
545			}
546
547
548			static double
549			l_atan2()
550			{
551			return(atan2(argument(1), argument(2)));
552			}
553
554
555			static double
556			l_exp()
557			{
558			return(exp(argument(1)));
559			}
560
561
562			static double
563			l_log()
564			{
565			return(log(argument(1)));
566			}
567
568
569			static double
570			l_log10()
571			{
572			return(log10(argument(1)));
573			}
574			#endif