Chris@10: /*
Chris@10:  * Copyright (c) 2003, 2007-11 Matteo Frigo
Chris@10:  * Copyright (c) 2003, 2007-11 Massachusetts Institute of Technology
Chris@10:  *
Chris@10:  * This program is free software; you can redistribute it and/or modify
Chris@10:  * it under the terms of the GNU General Public License as published by
Chris@10:  * the Free Software Foundation; either version 2 of the License, or
Chris@10:  * (at your option) any later version.
Chris@10:  *
Chris@10:  * This program is distributed in the hope that it will be useful,
Chris@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Chris@10:  * GNU General Public License for more details.
Chris@10:  *
Chris@10:  * You should have received a copy of the GNU General Public License
Chris@10:  * along with this program; if not, write to the Free Software
Chris@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
Chris@10:  *
Chris@10:  */
Chris@10: 
Chris@10: #include "api.h"
Chris@10: #include <stdio.h>
Chris@10: 
Chris@10: /* getc()/putc() are *unbelievably* slow on linux.  Looks like glibc
Chris@10:    is grabbing a lock for each call to getc()/putc(), or something
Chris@10:    like that.  You pay the price for these idiotic posix threads
Chris@10:    whether you use them or not.
Chris@10: 
Chris@10:    So, we do our own buffering.  This completely defeats the purpose
Chris@10:    of having stdio in the first place, of course.
Chris@10: */
Chris@10:   
Chris@10: #define BUFSZ 256
Chris@10: 
Chris@10: typedef struct {
Chris@10:      scanner super;
Chris@10:      FILE *f;
Chris@10:      char buf[BUFSZ];
Chris@10:      char *bufr, *bufw;
Chris@10: } S;
Chris@10: 
Chris@10: static int getchr_file(scanner * sc_)
Chris@10: {
Chris@10:      S *sc = (S *) sc_;
Chris@10: 
Chris@10:      if (sc->bufr >= sc->bufw) {
Chris@10: 	  sc->bufr = sc->buf;
Chris@10: 	  sc->bufw = sc->buf + fread(sc->buf, 1, BUFSZ, sc->f);
Chris@10: 	  if (sc->bufr >= sc->bufw)
Chris@10: 	       return EOF;
Chris@10:      }
Chris@10: 
Chris@10:      return *(sc->bufr++);
Chris@10: }
Chris@10: 
Chris@10: static scanner *mkscanner_file(FILE *f)
Chris@10: {
Chris@10:      S *sc = (S *) X(mkscanner)(sizeof(S), getchr_file);
Chris@10:      sc->f = f;
Chris@10:      sc->bufr = sc->bufw = sc->buf;
Chris@10:      return &sc->super;
Chris@10: }
Chris@10: 
Chris@10: int X(import_wisdom_from_file)(FILE *input_file)
Chris@10: {
Chris@10:      scanner *s = mkscanner_file(input_file);
Chris@10:      planner *plnr = X(the_planner)();
Chris@10:      int ret = plnr->adt->imprt(plnr, s);
Chris@10:      X(scanner_destroy)(s);
Chris@10:      return ret;
Chris@10: }
Chris@10: 
Chris@10: int X(import_wisdom_from_filename)(const char *filename)
Chris@10: {
Chris@10:      FILE *f = fopen(filename, "r");
Chris@10:      int ret;
Chris@10:      if (!f) return 0; /* error opening file */
Chris@10:      ret = X(import_wisdom_from_file)(f);
Chris@10:      if (fclose(f)) ret = 0; /* error closing file */
Chris@10:      return ret;
Chris@10: }