mirror of
https://github.com/tildearrow/furnace.git
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82 lines
2.3 KiB
C
82 lines
2.3 KiB
C
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/*
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* Copyright (c) 2003, 2007-14 Matteo Frigo
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* Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include "api/api.h"
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#include <stdio.h>
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/* getc()/putc() are *unbelievably* slow on linux. Looks like glibc
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is grabbing a lock for each call to getc()/putc(), or something
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like that. You pay the price for these idiotic posix threads
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whether you use them or not.
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So, we do our own buffering. This completely defeats the purpose
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of having stdio in the first place, of course.
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*/
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#define BUFSZ 256
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typedef struct {
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scanner super;
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FILE *f;
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char buf[BUFSZ];
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char *bufr, *bufw;
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} S;
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static int getchr_file(scanner * sc_)
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{
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S *sc = (S *) sc_;
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if (sc->bufr >= sc->bufw) {
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sc->bufr = sc->buf;
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sc->bufw = sc->buf + fread(sc->buf, 1, BUFSZ, sc->f);
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if (sc->bufr >= sc->bufw)
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return EOF;
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}
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return *(sc->bufr++);
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}
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static scanner *mkscanner_file(FILE *f)
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{
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S *sc = (S *) X(mkscanner)(sizeof(S), getchr_file);
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sc->f = f;
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sc->bufr = sc->bufw = sc->buf;
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return &sc->super;
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}
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int X(import_wisdom_from_file)(FILE *input_file)
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{
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scanner *s = mkscanner_file(input_file);
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planner *plnr = X(the_planner)();
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int ret = plnr->adt->imprt(plnr, s);
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X(scanner_destroy)(s);
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return ret;
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}
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int X(import_wisdom_from_filename)(const char *filename)
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{
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FILE *f = fopen(filename, "r");
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int ret;
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if (!f) return 0; /* error opening file */
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ret = X(import_wisdom_from_file)(f);
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if (fclose(f)) ret = 0; /* error closing file */
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return ret;
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}
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