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Annotation of src/usr.bin/grep/binary.c, Revision 1.13

1.13    ! deraadt     1: /*     $OpenBSD: binary.c,v 1.12 2004/05/06 20:18:51 otto 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>
                     30: #include <stdio.h>
                     31: #include <zlib.h>
                     32:
                     33: #include "grep.h"
                     34:
1.11      millert    35: #define        isbinary(ch)    (!isprint((ch)) && !isspace((ch)) && (ch) != '\b')
                     36:
1.1       deraadt    37: int
                     38: bin_file(FILE *f)
                     39: {
1.8       tedu       40:        char            buf[BUFSIZ];
1.1       deraadt    41:        int             i, m;
1.10      canacar    42:        int             ret = 0;
1.1       deraadt    43:
1.12      otto       44:        if (isatty(fileno(f)) || fseek(f, 0L, SEEK_SET) == -1)
1.1       deraadt    45:                return 0;
                     46:
1.8       tedu       47:        if ((m = (int)fread(buf, 1, BUFSIZ, f)) == 0)
1.1       deraadt    48:                return 0;
                     49:
                     50:        for (i = 0; i < m; i++)
1.11      millert    51:                if (isbinary(buf[i])) {
1.10      canacar    52:                        ret = 1;
                     53:                        break;
                     54:                }
1.1       deraadt    55:
                     56:        rewind(f);
1.10      canacar    57:        return ret;
1.1       deraadt    58: }
                     59:
1.3       deraadt    60: #ifndef NOZ
1.1       deraadt    61: int
                     62: gzbin_file(gzFile *f)
                     63: {
1.8       tedu       64:        char            buf[BUFSIZ];
1.1       deraadt    65:        int             i, m;
1.10      canacar    66:        int             ret = 0;
1.1       deraadt    67:
1.13    ! deraadt    68:        if (gzseek(f, (z_off_t)0, SEEK_SET) == -1)
1.1       deraadt    69:                return 0;
                     70:
1.8       tedu       71:        if ((m = gzread(f, buf, BUFSIZ)) == 0)
1.1       deraadt    72:                return 0;
                     73:
                     74:        for (i = 0; i < m; i++)
1.11      millert    75:                if (isbinary(buf[i])) {
1.10      canacar    76:                        ret = 1;
                     77:                        break;
                     78:                }
1.1       deraadt    79:
                     80:        gzrewind(f);
1.10      canacar    81:        return ret;
1.1       deraadt    82: }
1.3       deraadt    83: #endif
1.1       deraadt    84:
                     85: int
                     86: mmbin_file(mmf_t *f)
                     87: {
                     88:        int i;
1.3       deraadt    89:
1.1       deraadt    90:        /* XXX knows too much about mmf internals */
1.8       tedu       91:        for (i = 0; i < BUFSIZ && i < f->len; i++)
1.11      millert    92:                if (isbinary(f->base[i]))
1.1       deraadt    93:                        return 1;
                     94:        return 0;
                     95: }