upgrade to latest SWI
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Vitor Santos Costa
180
packages/PLStream/pl-option.c
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180
packages/PLStream/pl-option.c
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/* $Id$
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Part of SWI-Prolog
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Author: Jan Wielemaker
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E-mail: J.Wielemaker@uva.nl
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WWW: http://www.swi-prolog.org
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Copyright (C): 1985-2008, University of Amsterdam
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "pl-incl.h"
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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Variable argument list:
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atom_t name
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int type OPT_ATOM, OPT_STRING, OPT_BOOL, OPT_INT, OPT_LONG
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pointer value
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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#define MAXOPTIONS 32
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typedef union
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{ bool *b; /* boolean value */
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long *l; /* long value */
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int *i; /* integer value */
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uintptr_t *sz; /* size_t value */
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char **s; /* string value */
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word *a; /* atom value */
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term_t *t; /* term-reference */
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void *ptr; /* anonymous pointer */
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} optvalue;
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bool
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scan_options(term_t options, int flags, atom_t optype,
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const opt_spec *specs, ...)
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{ GET_LD
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va_list args;
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const opt_spec *s;
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optvalue values[MAXOPTIONS];
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term_t list = PL_copy_term_ref(options);
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term_t head = PL_new_term_ref();
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term_t tmp = PL_new_term_ref();
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term_t val = PL_new_term_ref();
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int n;
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if ( truePrologFlag(PLFLAG_ISO) )
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flags |= OPT_ALL;
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va_start(args, specs);
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for( n=0, s = specs; s->name; s++, n++ )
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values[n].ptr = va_arg(args, void *);
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va_end(args);
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while ( PL_get_list(list, head, list) )
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{ atom_t name;
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int arity;
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if ( PL_get_name_arity(head, &name, &arity) )
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{ if ( name == ATOM_equals && arity == 2 )
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{ _PL_get_arg(1, head, tmp);
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if ( !PL_get_atom(tmp, &name) )
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goto itemerror;
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_PL_get_arg(2, head, val);
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} else if ( arity == 1 )
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{ _PL_get_arg(1, head, val);
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} else if ( arity == 0 )
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PL_put_atom(val, ATOM_true);
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} else if ( PL_is_variable(head) )
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{ return PL_error(NULL, 0, NULL, ERR_INSTANTIATION);
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} else
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{ itemerror:
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return PL_error(NULL, 0, NULL, ERR_DOMAIN, optype, head);
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}
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for( n=0, s = specs; s->name; n++, s++ )
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{ if ( s->name == name )
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{ switch((s->type & OPT_TYPE_MASK))
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{ case OPT_BOOL:
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{ atom_t aval;
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if ( !PL_get_atom(val, &aval) )
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fail;
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if ( aval == ATOM_true || aval == ATOM_on )
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*values[n].b = TRUE;
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else if ( aval == ATOM_false || aval == ATOM_off )
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*values[n].b = FALSE;
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else
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goto itemerror;
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break;
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}
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case OPT_INT:
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{ if ( !PL_get_integer(val, values[n].i) )
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goto itemerror;
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break;
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}
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case OPT_LONG:
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{ if ( !PL_get_long(val, values[n].l) )
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{ if ( (s->type & OPT_INF) && PL_is_inf(val) )
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*values[n].l = LONG_MAX;
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else
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goto itemerror;
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}
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break;
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}
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case OPT_NATLONG:
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{ if ( !PL_get_long(val, values[n].l) )
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goto itemerror;
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if ( *(values[n].l) <= 0 )
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return PL_error(NULL, 0, NULL, ERR_DOMAIN,
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ATOM_not_less_than_one, val);
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break;
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}
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case OPT_SIZE:
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{ if ( !PL_get_uintptr(val, values[n].sz) )
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{ if ( (s->type & OPT_INF) && PL_is_inf(val) )
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*values[n].sz = (size_t)-1;
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else
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goto itemerror;
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}
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break;
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}
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case OPT_STRING:
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{ char *str;
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if ( !PL_get_chars(val, &str, CVT_ALL) ) /* copy? */
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goto itemerror;
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*values[n].s = str;
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break;
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}
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case OPT_ATOM:
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{ atom_t a;
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if ( !PL_get_atom(val, &a) )
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goto itemerror;
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*values[n].a = a;
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break;
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}
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case OPT_TERM:
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{ *values[n].t = val;
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val = PL_new_term_ref(); /* can't reuse anymore */
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break;
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}
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default:
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assert(0);
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fail;
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}
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break;
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}
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}
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if ( !s->name && (flags & OPT_ALL) )
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goto itemerror;
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}
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if ( !PL_get_nil(list) )
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return PL_error(NULL, 0, NULL, ERR_TYPE, ATOM_list, list);
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succeed;
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}
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