3.6.6 init.c

3.6.6 init.c

#include "hoc.h"

#include "y.tab.h"

#include <math.h>

extern double Log(), Log10(), Sqrt(), Exp(), integer();

static struct { /* Keywords */

 char *name;

 int kval;

} keywords[] = {

 "if",    IF,

 "else",  ELSE,

 "while", WHILE,

 "print", PRINT,

 0,       0,

};

static struct { /* Constants */

 char *name;

 double eval;

} consts[] = {

 "PI",    3.14159265358979323846,

 "E",     2.71828182845904523536,

 "GAMMA", 0.57721566490153286060, /* Euler */

 "DEG",  57.29577951308232087680, /* deg/radian */

 "PHI",   1.61803398874989484820, /* golden ratio */

 0,       0

};

static struct { /* Built-ins */

 char *name;

 double (*func)();

} builtins[] = {

 "sin",   sin,

 "cos",   cos,

 "atan",  atan,

 "log",   Log, /* checks argument */

 "log10", Log10, /* checks argument */

 "exp",   exp,

 "sqrt",  Sqrt, /* checks argument */

 "int",   integer,

 "abs",   fabs,

 0, 0

};

init() /* install constants and built-ins in table */

{

 int i;

 Symbol *s;

 for (i = 0; keywords[i].name; i++)

  install(keywords[i].name, keywords[i].kval, 0.0);

 for (i = 0; consts[i].name; i++)

  install(consts[i].name, VAR, consts[i].eval);

 for (i = 0; builtins[i].name; i++) {

  s = install(builtins[i].name, BLTIN, 0.0);

  s->u.ptr = builtins[i].func;

 }

}