157687Sbostic /*- 2*60663Sbostic * Copyright (c) 1992, 1993 3*60663Sbostic * The Regents of the University of California. All rights reserved. 457687Sbostic * 557687Sbostic * This code is derived from software contributed to Berkeley by 657687Sbostic * Rodney Ruddock of the University of Guelph. 757687Sbostic * 857687Sbostic * %sccs.include.redist.c% 957687Sbostic */ 1057687Sbostic 1157687Sbostic #ifndef lint 12*60663Sbostic static char sccsid[] = "@(#)get_line.c 8.1 (Berkeley) 05/31/93"; 1357687Sbostic #endif /* not lint */ 1457687Sbostic 1557710Sbostic #include <sys/types.h> 1657710Sbostic 1757710Sbostic #include <regex.h> 1857710Sbostic #include <setjmp.h> 1957710Sbostic #include <stdio.h> 2057710Sbostic #include <string.h> 2157710Sbostic 2258315Sbostic #ifdef DBI 2358315Sbostic #include <db.h> 2458315Sbostic #endif 2558315Sbostic 2657687Sbostic #include "ed.h" 2757710Sbostic #include "extern.h" 2857687Sbostic 2957687Sbostic /* 3057687Sbostic * Get the specified line from the buffer. Note that in the buffer 3157687Sbostic * we stored lengths of text, not strings (NULL terminated, except 3257687Sbostic * under MEMORY). So we want to put a terminating NULL in for 3357687Sbostic * whatever command is going to be handling the line. 3457687Sbostic */ 3557687Sbostic 3657687Sbostic /* these variables are here (instead of main and ed.h) because they 3757687Sbostic * are only used with the buffer when run under STDIO. STDIO is a 3857687Sbostic * resource pig with most of the OS's I've tested this with. The 3957687Sbostic * use of these variables improves performance up to 100% in several 4057687Sbostic * cases. The piggyness is thus: fseek causes the current STDIO buf 4157687Sbostic * to be flushed out and a new one read in...even when it is not necessary! 4257687Sbostic * Read 512 (or 1024) when you don't have to for almost every access 4357687Sbostic * and you'll slow down too. So these variable are used to control unneeded 4457687Sbostic * fseeks. 4557687Sbostic * I've been told the newer BSD STDIO has fixed this, but don't 4657687Sbostic * currently have a copy. 4757687Sbostic */ 4857687Sbostic int file_loc=0; 4957687Sbostic 5057687Sbostic /* Get a particular line of length len from ed's buffer and place it in 5157687Sbostic * 'text', the standard repository for the "current" line. 5257687Sbostic */ 5357687Sbostic void 5457687Sbostic get_line(loc, len) 5558315Sbostic #ifdef STDIO 5658315Sbostic long loc; 5758315Sbostic #endif 5858315Sbostic #ifdef DBI 5957710Sbostic recno_t loc; 6058315Sbostic #endif 6158315Sbostic #ifdef MEMORY 6258315Sbostic char *loc; 6358315Sbostic #endif 6457710Sbostic int len; 6557687Sbostic { 6658315Sbostic #ifdef DBI 6757710Sbostic DBT db_key, db_data; 6858315Sbostic #endif 6958315Sbostic int l_jmp_flag; 7057687Sbostic 7158315Sbostic if (l_jmp_flag = setjmp(ctrl_position2)) { 7258315Sbostic text[0] = '\0'; 7358315Sbostic return; 7458315Sbostic } 7558315Sbostic 7658315Sbostic sigspecial2 = 1; 7758315Sbostic #ifdef STDIO 7858315Sbostic 7958315Sbostic if (loc == 0L) { 8058315Sbostic text[0] = '\0'; 8158315Sbostic return; 8258315Sbostic } 8358315Sbostic if (file_loc != loc) 8458315Sbostic fseek(fhtmp, loc, 0); 8558315Sbostic file_seek = 1; 8658315Sbostic file_loc = loc + fread(text, sizeof(char), len, fhtmp); 8758315Sbostic #endif 8858315Sbostic 8958315Sbostic #ifdef DBI 9058315Sbostic if (loc == (recno_t)0) { 9158315Sbostic text[0] = '\0'; 9258315Sbostic return; 9358315Sbostic } 9457710Sbostic (db_key.data) = &loc; 9557710Sbostic (db_key.size) = sizeof(recno_t); 9657710Sbostic (dbhtmp->get) (dbhtmp, &db_key, &db_data, (u_int) 0); 9757710Sbostic strcpy(text, db_data.data); 9858315Sbostic #endif 9958315Sbostic 10058315Sbostic #ifdef MEMORY 10158315Sbostic if (loc == (char *)NULL) { 10258315Sbostic text[0] = '\0'; 10358315Sbostic return; 10458315Sbostic } 10559482Sbostic memmove(text, loc, len); 10658315Sbostic #endif 10757710Sbostic text[len] = '\0'; 10858315Sbostic sigspecial2 = 0; 10957710Sbostic } 110