1 /* $OpenBSD: binary.c,v 1.13 2004/09/15 22:35:36 deraadt 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 <stdio.h> 31 #include <zlib.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 char buf[BUFSIZ]; 41 int i, m; 42 int ret = 0; 43 44 if (isatty(fileno(f)) || fseek(f, 0L, SEEK_SET) == -1) 45 return 0; 46 47 if ((m = (int)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 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 gzrewind(f); 81 return ret; 82 } 83 #endif 84 85 int 86 mmbin_file(mmf_t *f) 87 { 88 int i; 89 90 /* XXX knows too much about mmf internals */ 91 for (i = 0; i < BUFSIZ && i < f->len; i++) 92 if (isbinary(f->base[i])) 93 return 1; 94 return 0; 95 } 96