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Added some documentation for the interface between C and Pascal.

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This was necessary because the format of Pascal and C procedure
pointers differ from now on.
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keie 1985-01-17 13:22:49 +00:00
parent d19105ef78
commit e75b8772ca
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doc/pcref.doc
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@ -413,6 +413,36 @@ for parameters. Some EM implementations check this:
\*(ONnot checked. \*(ONnot checked.
.I2 .I2
not checked. not checked.
.IE
.PP
For those who wish the use the interface between C and Pascal we
give an incomplete list of corresponding formal parameters in C and Pascal.
.sp 1
.ta 8 37
.nf
Pascal C
a:integer int a
a:char int a
a:boolean int a
a:real double a
a:^type type *a
var a:type type *a
procedure a(pars) struct {
void (*a)() ;
char *static_link ;
}
function a(pars):type struct {
type (*a)() ;
char *static_link ;
}
.fi
The Pascal runtime system uses the following algorithm when calling
function/procedures passed as parameters.
.nf
.ta 8 16
if ( static_link ) (*a)(static_link,pars) ;
else (*a)(pars) ;
.fi
.IT 6.7.2.1 .IT 6.7.2.1
The order of evaluation of the operands of a dyadic operator The order of evaluation of the operands of a dyadic operator
shall be implementation-dependent. shall be implementation-dependent.