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pgfun.c
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pgfun.c
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/*
This file contains miscelleneous C code which is required
to initialise the module and handle C<->perl function passing.
*/
/* Alternate ways of calling F77 from C */
#ifdef NO_TRAILING_USCORE
#define PGFUNX pgfunx
#define PGFUNY pgfuny
#define PGFUNT pgfunt
#define PGCONX pgconx
#else
#define PGFUNX pgfunx_
#define PGFUNY pgfuny_
#define PGFUNT pgfunt_
#define PGCONX pgconx_
#endif
/* Prototypes */
static SV* pgfunname[2];
float pgfun1();
float pgfun2();
void pgfunplot();
void PGFUNX(float fy(), int *n, float *xmin, float *xmax, int *pgflag);
void PGFUNY(float fx(), int *n, float *ymin, float *ymax, int *pgflag);
void PGFUNT(float fx(), float fy(), int *n, float *tmin, float *tmax, int *pgflag);
void PGCONX(float *a, int *idim, int *jdim, int *i1, int *i2, int *j1, int *j2,
float *c, int *nc, void plot());
/*
CPGPLOT prototypes missing in PGPLOT 5 - these handle passed
functions. Mechanism used below only works with standard UNIX
C/F77 passing. I have yet to find a system where this doesn't
work but patches are welcome.
*/
void cpgfunx (float pgfun1(), int n, float xmin, float xmax, int pgflag) {
PGFUNX(pgfun1,&n,&xmin,&xmax,&pgflag);
}
void cpgfuny (float pgfun1(), int n, float ymin, float ymax, int pgflag) {
PGFUNY(pgfun1,&n,&ymin,&ymax,&pgflag);
}
void cpgfunt (float pgfun1(), float pgfun2(), int n, float tmin, float tmax,
int pgflag) {
PGFUNT(pgfun1,pgfun2,&n,&tmin,&tmax,&pgflag);
}
void cpgconx ( float* a, int idim, int jdim, int i1, int i2,
int j1, int j2, float* c, int nc, void pgfunplot()) {
PGCONX(a,&idim,&jdim,&i1,&i2,&j1,&j2,c,&nc,pgfunplot);
}
/* The functions we actually pass to f77 - these call back
to the correct perl function whose names(s) are passed
via the back door (i.e. char static varables) */
/* pgplot called function perl intermediate number 1 */
float pgfun1(x)
float *x; {
dSP ;
int count;
SV* funname;
float retval;
funname = pgfunname[0]; /* Pass perl function name */
ENTER ;
SAVETMPS ;
PUSHMARK(sp) ;
/* Push arguments */
XPUSHs(sv_2mortal(newSVnv(*x)));
PUTBACK ;
/* Call Perl */
count = perl_call_sv(funname, G_SCALAR);
SPAGAIN;
if (count !=1)
croak("Error calling perl function\n");
retval = (float) POPn ; /* Return value */
PUTBACK ;
FREETMPS ;
LEAVE ;
return retval;
}
/* pgplot called function perl intermediate number 2 */
float pgfun2(x)
float *x; {
dSP ;
int count;
SV* funname;
float retval;
funname = pgfunname[1]; /* Pass perl function name */
ENTER ;
SAVETMPS ;
PUSHMARK(sp) ;
/* Push arguments */
XPUSHs(sv_2mortal(newSVnv(*x)));
PUTBACK ;
/* Call Perl */
count = perl_call_sv(funname, G_SCALAR);
SPAGAIN;
if (count !=1)
croak("Error calling perl function\n");
retval = (float) POPn ; /* Return value */
PUTBACK ;
FREETMPS ;
LEAVE ;
return retval;
}
/* pgplot called function perl intermediate for PGCONX */
void pgfunplot(visible,x,y,z)
int *visible;
float *x,*y,*z; {
dSP ;
int count;
SV* funname;
float retval;
funname = pgfunname[0]; /* Pass perl function name */
ENTER ;
SAVETMPS ;
PUSHMARK(sp) ;
/* Push arguments */
XPUSHs(sv_2mortal(newSViv(*visible)));
XPUSHs(sv_2mortal(newSVnv(*x)));
XPUSHs(sv_2mortal(newSVnv(*y)));
XPUSHs(sv_2mortal(newSVnv(*z)));
PUTBACK ;
/* Call Perl */
count = perl_call_sv(funname, G_SCALAR);
SPAGAIN;
if (count !=1)
croak("Error calling perl function\n");
PUTBACK ;
FREETMPS ;
LEAVE ;
}