clib package
This commit is contained in:
Vítor Santos Costa
163
packages/clib/files.c
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163
packages/clib/files.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: jan@swi.psy.uva.nl
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WWW: http://www.swi-prolog.org
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Copyright (C): 1985-2002, 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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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <SWI-Prolog.h>
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#include "clib.h"
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#include <stdlib.h>
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#include <time.h>
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#include <sys/types.h>
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#ifdef HAVE_UTIME_H
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#include <utime.h>
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#endif
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#include <sys/stat.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <errno.h>
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static functor_t FUNCTOR_access1;
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static functor_t FUNCTOR_modified1;
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static functor_t FUNCTOR_changed1;
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static atom_t ATOM_now;
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static int
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add_time_option(term_t list, functor_t f, time_t time)
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{ term_t tail = PL_copy_term_ref(list);
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term_t head = PL_new_term_ref();
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while(PL_get_list(tail, head, tail))
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{ if ( PL_unify_functor(head, f) )
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{ term_t a = PL_new_term_ref();
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return (PL_get_arg(1, head, a) &&
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PL_unify_float(a, (double)time));
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}
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}
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if ( PL_unify_list(tail, head, tail) )
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return PL_unify_term(head, PL_FUNCTOR, f, PL_FLOAT, (double)time);
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return FALSE;
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}
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static int
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close_list(term_t list)
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{ term_t tail = PL_copy_term_ref(list);
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term_t head = PL_new_term_ref();
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while(PL_get_list(tail, head, tail))
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;
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return PL_unify_nil(tail);
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}
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static int
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get_time_option(term_t list, functor_t f, time_t def, time_t *tme)
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{ term_t tail = PL_copy_term_ref(list);
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term_t head = PL_new_term_ref();
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while(PL_get_list(tail, head, tail))
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{ if ( PL_is_functor(head, f) )
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{ term_t a = PL_new_term_ref();
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double f;
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_PL_get_arg(1, head, a);
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if ( !PL_get_float(a, &f) )
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{ atom_t now;
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if ( PL_get_atom(a, &now) && now == ATOM_now )
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{ time(tme);
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return TRUE;
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} else
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return pl_error(NULL, 0, NULL, ERR_TYPE, a, "time");
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}
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*tme = (long)f;
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return TRUE;
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}
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}
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*tme = def;
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return TRUE;
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}
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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set_file_time(+Spec, -Old, +New)
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Query/set file-times.
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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static foreign_t
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pl_set_time_file(term_t spec, term_t old, term_t new)
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{ char *name;
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struct stat sbuf;
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if ( !PL_get_file_name(spec, &name, 0) )
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return FALSE;
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if ( stat(name, &sbuf) )
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return pl_error(NULL, 0, NULL, ERR_ERRNO, errno, "stat", "file", spec);
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add_time_option(old, FUNCTOR_access1, sbuf.st_atime);
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add_time_option(old, FUNCTOR_modified1, sbuf.st_mtime);
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add_time_option(old, FUNCTOR_changed1, sbuf.st_ctime);
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close_list(old);
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if ( !PL_get_nil(new) )
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#ifdef HAVE_UTIME
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{ struct utimbuf tbuf;
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if ( !get_time_option(new, FUNCTOR_access1,
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sbuf.st_atime, &tbuf.actime) )
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return FALSE;
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if ( !get_time_option(new, FUNCTOR_modified1,
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sbuf.st_mtime, &tbuf.modtime) )
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return FALSE;
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if ( utime(name, &tbuf) != 0 )
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return pl_error(NULL, 0, NULL, ERR_ERRNO, errno, "set_time", "file", spec);
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}
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#else
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return pl_error(NULL, 0, NULL, ERR_NOTIMPLEMENTED, "set_time", name);
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#endif
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return TRUE;
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}
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install_t
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install_files()
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{ FUNCTOR_access1 = PL_new_functor(PL_new_atom("access"), 1);
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FUNCTOR_modified1 = PL_new_functor(PL_new_atom("modified"), 1);
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FUNCTOR_changed1 = PL_new_functor(PL_new_atom("changed"), 1);
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ATOM_now = PL_new_atom("now");
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PL_register_foreign("set_time_file", 3, pl_set_time_file, 0);
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}
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