1 /* $OpenBSD: binary.c,v 1.15 2005/04/25 08:21:20 otto Exp $ */ 2 3 /*- 4 * Copyright (c) 1999 James Howard and Dag-Erling Co�dan Sm�rgrav 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 #include <zlib.h> 33 34 #include "grep.h" 35 36 #define isbinary(ch) (!isprint((ch)) && !isspace((ch)) && (ch) != '\b') 37 38 int 39 bin_file(FILE *f) 40 { 41 char buf[BUFSIZ]; 42 size_t i, m; 43 int ret = 0; 44 45 if (fseek(f, 0L, SEEK_SET) == -1) 46 return 0; 47 48 if ((m = fread(buf, 1, BUFSIZ, f)) == 0) 49 return 0; 50 51 for (i = 0; i < m; i++) 52 if (isbinary(buf[i])) { 53 ret = 1; 54 break; 55 } 56 57 rewind(f); 58 return ret; 59 } 60 61 #ifndef NOZ 62 int 63 gzbin_file(gzFile *f) 64 { 65 char buf[BUFSIZ]; 66 int i, m; 67 int ret = 0; 68 69 if (gzseek(f, (z_off_t)0, SEEK_SET) == -1) 70 return 0; 71 72 if ((m = gzread(f, buf, BUFSIZ)) <= 0) 73 return 0; 74 75 for (i = 0; i < m; i++) 76 if (isbinary(buf[i])) { 77 ret = 1; 78 break; 79 } 80 81 if (gzrewind(f) != 0) 82 err(1, "gzbin_file"); 83 return ret; 84 } 85 #endif 86 87 int 88 mmbin_file(mmf_t *f) 89 { 90 int i; 91 92 /* XXX knows too much about mmf internals */ 93 for (i = 0; i < BUFSIZ && i < f->len; i++) 94 if (isbinary(f->base[i])) 95 return 1; 96 return 0; 97 } 98