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 * 4. 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 */ 30 31 32 #define WR(p, size) do { \ 33 if (write(STDOUT_FILENO, p, size) != (ssize_t)size) \ 34 oerr(); \ 35 } while (0) 36 37 #define TAILMAPLEN (4<<20) 38 39 struct mapinfo { 40 off_t mapoff; 41 off_t maxoff; 42 size_t maplen; 43 char *start; 44 int fd; 45 }; 46 47 struct file_info { 48 FILE *fp; 49 char *file_name; 50 struct stat st; 51 }; 52 53 typedef struct file_info file_info_t; 54 55 enum STYLE { NOTSET = 0, FBYTES, FLINES, RBYTES, RLINES, REVERSE }; 56 57 void follow(file_info_t *, enum STYLE, off_t); 58 void forward(FILE *, const char *, enum STYLE, off_t, struct stat *); 59 void reverse(FILE *, const char *, enum STYLE, off_t, struct stat *); 60 61 int bytes(FILE *, const char *, off_t); 62 int lines(FILE *, const char *, off_t); 63 64 void ierr(const char *); 65 void oerr(void); 66 int mapprint(struct mapinfo *, off_t, off_t); 67 int maparound(struct mapinfo *, off_t); 68 69 extern int Fflag, fflag, qflag, rflag, rval, no_files; 70