/*- * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Rodney Ruddock of the University of Guelph. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint static char sccsid[] = "@(#)get_line.c 8.1 (Berkeley) 5/31/93"; #endif /* not lint */ #include <sys/types.h> #include <regex.h> #include <setjmp.h> #include <stdio.h> #include <string.h> #ifdef DBI #include <db.h> #endif #include "ed.h" #include "extern.h" /* * Get the specified line from the buffer. Note that in the buffer * we stored lengths of text, not strings (NULL terminated, except * under MEMORY). So we want to put a terminating NULL in for * whatever command is going to be handling the line. */ /* these variables are here (instead of main and ed.h) because they * are only used with the buffer when run under STDIO. STDIO is a * resource pig with most of the OS's I've tested this with. The * use of these variables improves performance up to 100% in several * cases. The piggyness is thus: fseek causes the current STDIO buf * to be flushed out and a new one read in...even when it is not necessary! * Read 512 (or 1024) when you don't have to for almost every access * and you'll slow down too. So these variable are used to control unneeded * fseeks. * I've been told the newer BSD STDIO has fixed this, but don't * currently have a copy. */ int file_loc=0; /* Get a particular line of length len from ed's buffer and place it in * 'text', the standard repository for the "current" line. */ void get_line(loc, len) #ifdef STDIO long loc; #endif #ifdef DBI recno_t loc; #endif #ifdef MEMORY char *loc; #endif int len; { #ifdef DBI DBT db_key, db_data; #endif int l_jmp_flag; if (l_jmp_flag = setjmp(ctrl_position2)) { text[0] = '\0'; return; } sigspecial2 = 1; #ifdef STDIO if (loc == 0L) { text[0] = '\0'; return; } if (file_loc != loc) fseek(fhtmp, loc, 0); file_seek = 1; file_loc = loc + fread(text, sizeof(char), len, fhtmp); #endif #ifdef DBI if (loc == (recno_t)0) { text[0] = '\0'; return; } (db_key.data) = &loc; (db_key.size) = sizeof(recno_t); (dbhtmp->get) (dbhtmp, &db_key, &db_data, (u_int) 0); strcpy(text, db_data.data); #endif #ifdef MEMORY if (loc == (char *)NULL) { text[0] = '\0'; return; } memmove(text, loc, len); #endif text[len] = '\0'; sigspecial2 = 0; }