commands/grep/binary.c

   1 /*      $OpenBSD: binary.c,v 1.14 2005/02/07 08:47:18 otto Exp $        */
   2
   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 <err.h>
  31 #include <stdio.h>
  32
  33 #include "grep.h"
  34
  35 #define isbinary(ch)    (!isprint((ch)) && !isspace((ch)) && (ch) != '\b')
  36
  37 int
  38 bin_file(FILE *f)
  39 {
  40         unsigned char   buf[BUFSIZ];
  41         size_t          i, m;
  42         int             ret = 0;
  43
  44         if (fseek(f, 0L, SEEK_SET) == -1)
  45                 return 0;
  46
  47         if ((m = fread(buf, 1, BUFSIZ, f)) == 0)
  48                 return 0;
  49
  50         for (i = 0; i < m; i++)
  51                 if (isbinary(buf[i])) {
  52                         ret = 1;
  53                         break;
  54                 }
  55
  56         rewind(f);
  57         return ret;
  58 }
  59
  60 #ifndef NOZ
  61 int
  62 gzbin_file(gzFile *f)
  63 {
  64         unsigned char   buf[BUFSIZ];
  65         int             i, m;
  66         int             ret = 0;
  67
  68         if (gzseek(f, (z_off_t)0, SEEK_SET) == -1)
  69                 return 0;
  70
  71         if ((m = gzread(f, buf, BUFSIZ)) <= 0)
  72                 return 0;
  73
  74         for (i = 0; i < m; i++)
  75                 if (isbinary(buf[i])) {
  76                         ret = 1;
  77                         break;
  78                 }
  79
  80         if (gzrewind(f) != 0)
  81                 err(1, "gzbin_file");
  82         return ret;
  83 }
  84 #endif
  85
  86 int
  87 mmbin_file(mmf_t *f)
  88 {
  89         int i;
  90
  91         /* XXX knows too much about mmf internals */
  92         for (i = 0; i < BUFSIZ && i < f->len; i++)
  93                 if (isbinary(f->base[i]))
  94                         return 1;
  95         return 0;
  96 }