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 32 #define WR(p, size) do { \ 33 ssize_t res; \ 34 res = write(STDOUT_FILENO, p, size); \ 35 if (res != (ssize_t)size) { \ 36 if (res == -1) \ 37 oerr(); \ 38 else \ 39 errx(1, "stdout"); \ 40 } \ 41 } while (0) 42 43 #define TAILMAPLEN (4<<20) 44 45 struct mapinfo { 46 off_t mapoff; 47 off_t maxoff; 48 size_t maplen; 49 char *start; 50 int fd; 51 }; 52 53 struct file_info { 54 FILE *fp; 55 const char *file_name; 56 struct stat st; 57 }; 58 59 typedef struct file_info file_info_t; 60 61 enum STYLE { NOTSET = 0, FBYTES, FLINES, RBYTES, RLINES, REVERSE }; 62 63 void follow(file_info_t *, enum STYLE, off_t); 64 void forward(FILE *, const char *, enum STYLE, off_t, struct stat *); 65 void reverse(FILE *, const char *, enum STYLE, off_t, struct stat *); 66 67 int bytes(FILE *, const char *, off_t); 68 int lines(FILE *, const char *, off_t); 69 70 void ierr(const char *); 71 void oerr(void); 72 int mapprint(struct mapinfo *, off_t, off_t); 73 int maparound(struct mapinfo *, off_t); 74 void printfn(const char *, int); 75 76 extern int Fflag, fflag, qflag, rflag, rval, no_files, vflag; 77 extern fileargs_t *fa; 78