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1 /*
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2 * Copyright (c) 2003, 2007-8 Matteo Frigo
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3 * Copyright (c) 2003, 2007-8 Massachusetts Institute of Technology
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4 *
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5 * This program is free software; you can redistribute it and/or modify
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6 * it under the terms of the GNU General Public License as published by
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7 * the Free Software Foundation; either version 2 of the License, or
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8 * (at your option) any later version.
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9 *
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10 * This program is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 * GNU General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU General Public License
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16 * along with this program; if not, write to the Free Software
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17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18 *
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19 */
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20
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21 #include "api.h"
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22 #include <stdio.h>
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23
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24 /* getc()/putc() are *unbelievably* slow on linux. Looks like glibc
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25 is grabbing a lock for each call to getc()/putc(), or something
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26 like that. You pay the price for these idiotic posix threads
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27 whether you use them or not.
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28
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29 So, we do our own buffering. This completely defeats the purpose
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30 of having stdio in the first place, of course.
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31 */
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32
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33 #define BUFSZ 256
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34
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35 typedef struct {
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36 scanner super;
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37 FILE *f;
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38 char buf[BUFSZ];
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39 char *bufr, *bufw;
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40 } S;
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41
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42 static int getchr_file(scanner * sc_)
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43 {
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44 S *sc = (S *) sc_;
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45
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46 if (sc->bufr >= sc->bufw) {
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47 sc->bufr = sc->buf;
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48 sc->bufw = sc->buf + fread(sc->buf, 1, BUFSZ, sc->f);
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49 if (sc->bufr >= sc->bufw)
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50 return EOF;
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51 }
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52
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53 return *(sc->bufr++);
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54 }
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55
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56 static scanner *mkscanner_file(FILE *f)
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57 {
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58 S *sc = (S *) X(mkscanner)(sizeof(S), getchr_file);
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59 sc->f = f;
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60 sc->bufr = sc->bufw = sc->buf;
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61 return &sc->super;
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62 }
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63
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64 int X(import_wisdom_from_file)(FILE *input_file)
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65 {
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66 scanner *s = mkscanner_file(input_file);
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67 planner *plnr = X(the_planner)();
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68 int ret = plnr->adt->imprt(plnr, s);
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69 X(scanner_destroy)(s);
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70 return ret;
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71 }
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