1993-04-08 05:07:16 +04:00
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/* buf.c: This file contains the scratch-file buffer rountines for the
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ed line editor. */
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/*-
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* Copyright (c) 1992 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rodney Ruddock of the University of Guelph.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)buf.c 5.5 (Berkeley) 3/28/93";
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#endif /* not lint */
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/file.h>
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#include <unistd.h>
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#include "ed.h"
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1993-04-10 15:46:38 +04:00
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extern char errmsg[];
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1993-04-08 05:07:16 +04:00
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extern line_t line0;
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FILE *sfp; /* scratch file pointer */
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off_t sfseek; /* scratch file position */
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int seek_write; /* seek before writing */
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/* gettxt: get a line of text from the scratch file; return pointer
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to the text */
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char *
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gettxt(lp)
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line_t *lp;
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{
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static char txtbuf[MAXLINE];
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int len, ct;
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if (lp == &line0)
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return NULL;
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seek_write = 1; /* force seek on write */
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/* out of position */
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if (sfseek != lp->seek) {
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sfseek = lp->seek;
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if (fseek(sfp, sfseek, SEEK_SET) < 0) {
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1993-04-14 16:22:14 +04:00
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fprintf(stderr, "%s\n", strerror(errno));
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1993-04-10 15:46:38 +04:00
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sprintf(errmsg, "cannot seek temp file");
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1993-04-08 05:07:16 +04:00
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return (char *) ERR;
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}
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}
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len = lp->len & ~ACTV;
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if ((ct = fread(txtbuf, sizeof(char), len, sfp)) < 0 || ct != len) {
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1993-04-14 16:22:14 +04:00
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fprintf(stderr, "%s\n", strerror(errno));
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1993-04-10 15:46:38 +04:00
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sprintf(errmsg, "cannot read temp file");
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1993-04-08 05:07:16 +04:00
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return (char *) ERR;
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}
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sfseek += len; /* update file position */
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txtbuf[len] = '\0';
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return txtbuf;
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}
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extern long curln;
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extern long lastln;
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/* puttxt: write a line of text to the scratch file and add a line node
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to the editor buffer; return a pointer to the end of the text */
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char *
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puttxt(cs)
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char *cs;
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{
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line_t *lp;
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int len, ct;
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char *s;
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if ((lp = (line_t *) malloc(sizeof(line_t))) == NULL) {
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1993-04-14 16:22:14 +04:00
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fprintf(stderr, "%s\n", strerror(errno));
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1993-04-10 15:46:38 +04:00
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sprintf(errmsg, "out of memory");
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1993-04-08 05:07:16 +04:00
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return (char *) ERR;
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}
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/* assert: cs is '\n' terminated */
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for (s = cs; *s != '\n'; s++)
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;
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len = (s - cs) & ~ACTV;
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/* out of position */
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if (seek_write) {
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if (fseek(sfp, 0L, SEEK_END) < 0) {
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1993-04-14 16:22:14 +04:00
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fprintf(stderr, "%s\n", strerror(errno));
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1993-04-10 15:46:38 +04:00
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sprintf(errmsg, "cannot seek temp file");
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1993-04-08 05:07:16 +04:00
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return (char *) ERR;
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}
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sfseek = ftell(sfp);
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seek_write = 0;
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}
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/* assert: spl1() */
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if ((ct = fwrite(cs, sizeof(char), len, sfp)) < 0 || ct != len) {
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sfseek = -1;
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1993-04-14 16:22:14 +04:00
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fprintf(stderr, "%s\n", strerror(errno));
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1993-04-10 15:46:38 +04:00
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sprintf(errmsg, "cannot write temp file");
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1993-04-08 05:07:16 +04:00
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return (char *) ERR;
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}
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lp->len = len;
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lp->seek = sfseek;
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lpqueue(lp);
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sfseek += len; /* update file position */
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return (*++s == '\0') ? NULL : s;
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}
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/* lpqueue: add a line node in the editor buffer after the current line */
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void
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lpqueue(lp)
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line_t *lp;
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{
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line_t *cp;
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cp = getptr(curln); /* this getptr last! */
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insqueue(lp, cp);
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lastln++;
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curln++;
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}
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1993-04-14 16:22:14 +04:00
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/* getaddr: return line number of pointer */
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long
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getaddr(lp)
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line_t *lp;
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{
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line_t *cp = &line0;
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long n = 0;
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while (cp != lp && (cp = cp->next) != &line0)
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n++;
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return (cp != &line0) ? n : 0;
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}
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1993-04-08 05:07:16 +04:00
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extern int mutex;
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extern int sigflags;
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/* getptr: return pointer to a line node in the editor buffer */
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line_t *
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getptr(n)
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long n;
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{
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static line_t *lp = &line0;
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static long on = 0;
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spl1();
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if (n > on)
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1993-04-10 15:46:38 +04:00
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if (n <= (on + lastln) >> 1)
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1993-04-08 05:07:16 +04:00
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for (; on < n; on++)
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lp = lp->next;
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1993-04-10 15:46:38 +04:00
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else {
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1993-04-08 05:07:16 +04:00
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lp = line0.prev;
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for (on = lastln; on > n; on--)
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lp = lp->prev;
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}
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else
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1993-04-10 15:46:38 +04:00
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if (n >= on >> 1)
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1993-04-08 05:07:16 +04:00
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for (; on > n; on--)
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lp = lp->prev;
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1993-04-10 15:46:38 +04:00
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else {
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1993-04-08 05:07:16 +04:00
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lp = &line0;
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for (on = 0; on < n; on++)
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lp = lp->next;
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}
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spl0();
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return lp;
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}
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char sfn[15] = ""; /* scratch file name */
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/* sbopen: open scratch file */
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sbopen()
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{
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strcpy(sfn, "/tmp/ed.XXXXXX");
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if (mktemp(sfn) == NULL || (sfp = fopen(sfn, "w+")) == NULL) {
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1993-04-14 16:22:14 +04:00
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fprintf(stderr, "%s: %s\n", sfn, strerror(errno));
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1993-04-10 15:46:38 +04:00
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sprintf(errmsg, "cannot open temp file");
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1993-04-08 05:07:16 +04:00
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return ERR;
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}
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return 0;
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}
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1993-04-10 15:46:38 +04:00
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1993-04-08 05:07:16 +04:00
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/* sbclose: close scratch file */
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sbclose()
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{
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if (sfp) {
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1993-04-14 16:22:14 +04:00
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if (fclose(sfp) < 0) {
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fprintf(stderr, "%s: %s\n", sfn, strerror(errno));
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sprintf(errmsg, "cannot close temp file");
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return ERR;
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}
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1993-04-08 05:07:16 +04:00
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sfp = NULL;
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1993-04-10 15:46:38 +04:00
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unlink(sfn);
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1993-04-08 05:07:16 +04:00
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}
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sfseek = seek_write = 0;
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}
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/* quit: remove scratch file and exit */
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void
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quit(n)
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int n;
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{
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if (sfp) {
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unlink(sfn);
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fclose(sfp);
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}
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exit(n);
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}
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