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Annotation of src/usr.bin/grep/binary.c, Revision 1.14

1.14    ! otto        1: /*     $OpenBSD: binary.c,v 1.13 2004/09/15 22:35:36 deraadt Exp $     */
1.4       deraadt     2:
1.1       deraadt     3: /*-
                      4:  * Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav
                      5:  * All rights reserved.
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  *
                     16:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
                     17:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     18:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     19:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
                     20:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     21:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     22:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     23:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     24:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     25:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     26:  * SUCH DAMAGE.
                     27:  */
                     28:
                     29: #include <ctype.h>
1.14    ! otto       30: #include <err.h>
1.1       deraadt    31: #include <stdio.h>
                     32: #include <zlib.h>
                     33:
                     34: #include "grep.h"
                     35:
1.11      millert    36: #define        isbinary(ch)    (!isprint((ch)) && !isspace((ch)) && (ch) != '\b')
                     37:
1.1       deraadt    38: int
                     39: bin_file(FILE *f)
                     40: {
1.8       tedu       41:        char            buf[BUFSIZ];
1.1       deraadt    42:        int             i, m;
1.10      canacar    43:        int             ret = 0;
1.1       deraadt    44:
1.14    ! otto       45:        if (fseek(f, 0L, SEEK_SET) == -1)
1.1       deraadt    46:                return 0;
                     47:
1.8       tedu       48:        if ((m = (int)fread(buf, 1, BUFSIZ, f)) == 0)
1.1       deraadt    49:                return 0;
                     50:
                     51:        for (i = 0; i < m; i++)
1.11      millert    52:                if (isbinary(buf[i])) {
1.10      canacar    53:                        ret = 1;
                     54:                        break;
                     55:                }
1.1       deraadt    56:
                     57:        rewind(f);
1.10      canacar    58:        return ret;
1.1       deraadt    59: }
                     60:
1.3       deraadt    61: #ifndef NOZ
1.1       deraadt    62: int
                     63: gzbin_file(gzFile *f)
                     64: {
1.8       tedu       65:        char            buf[BUFSIZ];
1.1       deraadt    66:        int             i, m;
1.10      canacar    67:        int             ret = 0;
1.1       deraadt    68:
1.13      deraadt    69:        if (gzseek(f, (z_off_t)0, SEEK_SET) == -1)
1.1       deraadt    70:                return 0;
                     71:
1.8       tedu       72:        if ((m = gzread(f, buf, BUFSIZ)) == 0)
1.1       deraadt    73:                return 0;
                     74:
                     75:        for (i = 0; i < m; i++)
1.11      millert    76:                if (isbinary(buf[i])) {
1.10      canacar    77:                        ret = 1;
                     78:                        break;
                     79:                }
1.1       deraadt    80:
1.14    ! otto       81:        if (gzrewind(f) != 0)
        !            82:                err(1, "gzbin_file");
1.10      canacar    83:        return ret;
1.1       deraadt    84: }
1.3       deraadt    85: #endif
1.1       deraadt    86:
                     87: int
                     88: mmbin_file(mmf_t *f)
                     89: {
                     90:        int i;
1.3       deraadt    91:
1.1       deraadt    92:        /* XXX knows too much about mmf internals */
1.8       tedu       93:        for (i = 0; i < BUFSIZ && i < f->len; i++)
1.11      millert    94:                if (isbinary(f->base[i]))
1.1       deraadt    95:                        return 1;
                     96:        return 0;
                     97: }