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 #ifndef _TAIL_EXTERN_H 32 #define _TAIL_EXTERN_H 33 34 #include <sys/types.h> 35 #include <sys/stat.h> 36 #include <port.h> 37 38 #define WR(p, size) do { \ 39 if (write(STDOUT_FILENO, p, size) != (ssize_t)size) \ 40 oerr(); \ 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 char *file_name; 56 struct stat st; 57 file_obj_t fobj[2]; 58 }; 59 60 typedef struct file_info file_info_t; 61 62 enum STYLE { NOTSET = 0, FBYTES, FLINES, RBYTES, RLINES, REVERSE }; 63 64 void follow(file_info_t *, enum STYLE, off_t); 65 void forward(FILE *, const char *, enum STYLE, off_t, struct stat *); 66 void reverse(FILE *, const char *, enum STYLE, off_t, struct stat *); 67 68 int bytes(FILE *, const char *, off_t); 69 int lines(FILE *, const char *, off_t); 70 71 void ierr(const char *); 72 void oerr(void); 73 int mapprint(struct mapinfo *, off_t, off_t); 74 int maparound(struct mapinfo *, off_t); 75 76 extern int Fflag, fflag, qflag, rflag, rval, no_files; 77 78 #endif /* _TAIL_EXTERN_H */ 79