1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. 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 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)extern.h 8.1 (Berkeley) 6/6/93 32 */ 33 34 #define WR(p, size) do { \ 35 ssize_t res; \ 36 res = write(STDOUT_FILENO, p, size); \ 37 if (res != (ssize_t)size) { \ 38 if (res == -1) \ 39 oerr(); \ 40 else \ 41 errx(1, "stdout"); \ 42 } \ 43 } while (0) 44 45 #define TAILMAPLEN (4<<20) 46 47 struct mapinfo { 48 off_t mapoff; 49 off_t maxoff; 50 size_t maplen; 51 char *start; 52 int fd; 53 }; 54 55 struct file_info { 56 FILE *fp; 57 const char *file_name; 58 struct stat st; 59 }; 60 61 typedef struct file_info file_info_t; 62 63 enum STYLE { NOTSET = 0, FBYTES, FLINES, RBYTES, RLINES, REVERSE }; 64 65 void follow(file_info_t *, enum STYLE, off_t); 66 void forward(FILE *, const char *, enum STYLE, off_t, struct stat *); 67 void reverse(FILE *, const char *, enum STYLE, off_t, struct stat *); 68 69 int bytes(FILE *, const char *, off_t); 70 int lines(FILE *, const char *, off_t); 71 72 void ierr(const char *); 73 void oerr(void); 74 int mapprint(struct mapinfo *, off_t, off_t); 75 int maparound(struct mapinfo *, off_t); 76 void printfn(const char *, int); 77 78 extern int Fflag, fflag, qflag, rflag, rval, no_files, vflag; 79 extern fileargs_t *fa; 80