1 /*- 2 * Copyright (c) 1992, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (c) 1992, 1993, 1994, 1995, 1996 5 * Keith Bostic. All rights reserved. 6 * 7 * See the LICENSE file for redistribution information. 8 */ 9 10 #include "config.h" 11 12 #ifndef lint 13 static const char sccsid[] = "@(#)ex_equal.c 10.10 (Berkeley) 3/6/96"; 14 #endif /* not lint */ 15 16 #include <sys/types.h> 17 #include <sys/queue.h> 18 19 #include <bitstring.h> 20 #include <limits.h> 21 #include <stdio.h> 22 23 #include "../common/common.h" 24 25 /* 26 * ex_equal -- :address = 27 * 28 * PUBLIC: int ex_equal __P((SCR *, EXCMD *)); 29 */ 30 int 31 ex_equal(sp, cmdp) 32 SCR *sp; 33 EXCMD *cmdp; 34 { 35 recno_t lno; 36 37 NEEDFILE(sp, cmdp); 38 39 /* 40 * Print out the line number matching the specified address, 41 * or the number of the last line in the file if no address 42 * specified. 43 * 44 * !!! 45 * Historically, ":0=" displayed 0, and ":=" or ":1=" in an 46 * empty file displayed 1. Until somebody complains loudly, 47 * we're going to do it right. The tables in excmd.c permit 48 * lno to get away with any address from 0 to the end of the 49 * file, which, in an empty file, is 0. 50 */ 51 if (F_ISSET(cmdp, E_ADDR_DEF)) { 52 if (db_last(sp, &lno)) 53 return (1); 54 } else 55 lno = cmdp->addr1.lno; 56 57 (void)ex_printf(sp, "%ld\n", lno); 58 return (0); 59 } 60