system/doc/tutorial/ei.c


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/* ei.c */

#include "erl_interface.h"
#include "ei.h"

typedef unsigned char byte;

int main() {
  ETERM *tuplep, *intp;
  ETERM *fnp, *argp;
  int res;
  byte buf[100];
  long allocated, freed;

  erl_init(NULL, 0);

  while (read_cmd(buf) > 0) {
    tuplep = erl_decode(buf);
    fnp = erl_element(1, tuplep);
    argp = erl_element(2, tuplep);
    
    if (strncmp(ERL_ATOM_PTR(fnp), "foo", 3) == 0) {
      res = foo(ERL_INT_VALUE(argp));
    } else if (strncmp(ERL_ATOM_PTR(fnp), "bar", 17) == 0) {
      res = bar(ERL_INT_VALUE(argp));
    }

    intp = erl_mk_int(res);
    erl_encode(intp, buf);
    write_cmd(buf, erl_term_len(intp));

    erl_free_compound(tuplep);
    erl_free_term(fnp);
    erl_free_term(argp);
    erl_free_term(intp);
  }
}