1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)extern.h 8.1 (Berkeley) 6/6/93 30 * 31 * $FreeBSD: src/usr.bin/tail/extern.h,v 1.4.6.2 2001/12/19 20:29:29 iedowse Exp $ 32 */ 33 34 #define WR(p, size) do { \ 35 if (write(STDOUT_FILENO, p, size) != size) \ 36 oerr(); \ 37 } while(0) 38 39 #define TAILMAPLEN (4<<20) 40 41 struct mapinfo { 42 off_t mapoff; 43 off_t maxoff; 44 size_t maplen; 45 char *start; 46 int fd; 47 }; 48 49 struct file_info { 50 FILE *fp; 51 char *file_name; 52 struct stat st; 53 }; 54 55 typedef struct file_info file_info_t; 56 57 enum STYLE { FBYTES, FLINES, RBYTES, RLINES, REVERSE }; 58 59 void follow(file_info_t *, enum STYLE, off_t); 60 void forward(FILE *, enum STYLE, off_t, struct stat *); 61 void reverse(FILE *, enum STYLE, off_t, struct stat *); 62 63 int display_bytes(FILE *, off_t); 64 int display_lines(FILE *, off_t); 65 66 void ierr(void); 67 void oerr(void) __dead2; 68 int mapprint(struct mapinfo *, off_t, off_t); 69 int maparound(struct mapinfo *, off_t); 70 void showfilename(int, const char *); 71 72 extern int Fflag, fflag, qflag, rflag, vflag, rval, no_files; 73 extern const char *fname; 74