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Annotation of src/usr.bin/grep/binary.c, Revision 1.2

1.1       deraadt     1: /*-
                      2:  * Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms, with or without
                      6:  * modification, are permitted provided that the following conditions
                      7:  * are met:
                      8:  * 1. Redistributions of source code must retain the above copyright
                      9:  *    notice, this list of conditions and the following disclaimer.
                     10:  * 2. Redistributions in binary form must reproduce the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer in the
                     12:  *    documentation and/or other materials provided with the distribution.
                     13:  *
                     14:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
                     15:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     16:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     17:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
                     18:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     19:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     20:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     21:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     22:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     23:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     24:  * SUCH DAMAGE.
                     25:  *
1.2     ! deraadt    26:  *     $Id: binary.c,v 1.1 2003/06/22 22:20:07 deraadt Exp $
1.1       deraadt    27:  */
                     28:
                     29: #include <ctype.h>
                     30: #include <stdio.h>
                     31: #include <zlib.h>
                     32:
                     33: #include "grep.h"
                     34:
                     35: #define BUFFER_SIZE 32
                     36:
                     37: int
                     38: bin_file(FILE *f)
                     39: {
                     40:        char            buf[BUFFER_SIZE];
                     41:        int             i, m;
                     42:
1.2     ! deraadt    43:        if (fseek(f, 0L, SEEK_SET) == -1)
1.1       deraadt    44:                return 0;
                     45:
                     46:        if ((m = (int)fread(buf, 1, BUFFER_SIZE, f)) == 0)
                     47:                return 0;
                     48:
                     49:        for (i = 0; i < m; i++)
                     50:                if (!isprint(buf[i]) && !isspace(buf[i]))
                     51:                        return 1;
                     52:
                     53:        rewind(f);
                     54:        return 0;
                     55: }
                     56:
                     57: int
                     58: gzbin_file(gzFile *f)
                     59: {
                     60:        char            buf[BUFFER_SIZE];
                     61:        int             i, m;
                     62:
                     63:        if (gzseek(f, SEEK_SET, 0) == -1)
                     64:                return 0;
                     65:
                     66:        if ((m = (int)gzread(f, buf, BUFFER_SIZE)) == 0)
                     67:                return 0;
                     68:
                     69:        for (i = 0; i < m; i++)
                     70:                if (!isprint(buf[i]))
                     71:                        return 1;
                     72:
                     73:        gzrewind(f);
                     74:        return 0;
                     75: }
                     76:
                     77: int
                     78: mmbin_file(mmf_t *f)
                     79: {
                     80:        int i;
                     81:
                     82:        /* XXX knows too much about mmf internals */
                     83:        for (i = 0; i < BUFFER_SIZE && i < f->len; i++)
                     84:                if (!isprint(f->base[i]))
                     85:                        return 1;
                     86:        mmrewind(f);
                     87:        return 0;
                     88: }