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Initial data commit

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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 72d218235f
commit f23f22d71c
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2
Task/Call-a-foreign-language-function/Prolog/call-a-foreign-language-function-1.pro Normal file
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:- module(plffi, [strdup/2]).
:- use_foreign_library(plffi).

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Task/Call-a-foreign-language-function/Prolog/call-a-foreign-language-function-2.pro Normal file
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#include <string.h>
#include <stdio.h>
#include <SWI-Prolog.h>
static foreign_t pl_strdup(term_t string0, term_t string1)
{
char *input_string, *output_string;
if (PL_get_atom_chars(string0, &input_string))
{
output_string = strdup(input_string);
return PL_unify_atom_chars(string1, output_string);
}
PL_fail;
}
install_t install_plffi()
{
PL_register_foreign("strdup", 2, pl_strdup, 0);
}

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Task/Call-a-foreign-language-function/Prolog/call-a-foreign-language-function-3.pro Normal file
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$ swipl-ld -o plffi -shared plffi.c

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Task/Call-a-foreign-language-function/Prolog/call-a-foreign-language-function-4.pro Normal file
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?- [plffi].
% plffi compiled into plffi 0.04 sec, 1,477 clauses
true.
?- strdup('Booger!', X).
X = 'Booger!'.
?- strdup(booger, X).
X = booger.
?- strdup(booger, booger).
true.
?- X = booger, strdup(booger, X).
X = booger.