281 lines
6.4 KiB
C
281 lines
6.4 KiB
C
/* 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) 1993 Andrew Moore, Talke Studio.
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* All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 *rcsid = "@(#)buf.c,v 1.4 1994/02/01 00:34:35 alm Exp";
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#endif /* not lint */
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#include <sys/file.h>
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#include "ed.h"
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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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line_t buffer_head; /* incore buffer */
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/* get_sbuf_line: 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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get_sbuf_line(lp)
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line_t *lp;
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{
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static char *sfbuf = NULL; /* buffer */
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static int sfbufsz = 0; /* buffer size */
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int len, ct;
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if (lp == &buffer_head)
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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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fprintf(stderr, "%s\n", strerror(errno));
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sprintf(errmsg, "cannot seek temp file");
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return NULL;
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}
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}
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len = lp->len;
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REALLOC(sfbuf, sfbufsz, len + 1, NULL);
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if ((ct = fread(sfbuf, sizeof(char), len, sfp)) < 0 || ct != len) {
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fprintf(stderr, "%s\n", strerror(errno));
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sprintf(errmsg, "cannot read temp file");
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return NULL;
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}
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sfseek += len; /* update file position */
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sfbuf[len] = '\0';
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return sfbuf;
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}
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/* put_sbuf_line: 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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put_sbuf_line(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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fprintf(stderr, "%s\n", strerror(errno));
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sprintf(errmsg, "out of memory");
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return NULL;
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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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if (s - cs >= LINECHARS) {
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sprintf(errmsg, "line too long");
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return NULL;
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}
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len = s - cs;
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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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fprintf(stderr, "%s\n", strerror(errno));
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sprintf(errmsg, "cannot seek temp file");
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return NULL;
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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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fprintf(stderr, "%s\n", strerror(errno));
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sprintf(errmsg, "cannot write temp file");
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return NULL;
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}
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lp->len = len;
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lp->seek = sfseek;
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add_line_node(lp);
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sfseek += len; /* update file position */
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return ++s;
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}
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/* add_line_node: add a line node in the editor buffer after the current line */
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void
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add_line_node(lp)
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line_t *lp;
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{
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line_t *cp;
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cp = get_addressed_line_node(current_addr); /* this get_addressed_line_node last! */
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insque(lp, cp);
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addr_last++;
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current_addr++;
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}
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/* get_line_node_addr: return line number of pointer */
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long
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get_line_node_addr(lp)
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line_t *lp;
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{
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line_t *cp = &buffer_head;
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long n = 0;
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while (cp != lp && (cp = cp->q_forw) != &buffer_head)
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n++;
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if (n && cp == &buffer_head) {
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sprintf(errmsg, "invalid address");
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return ERR;
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}
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return n;
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}
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/* get_addressed_line_node: return pointer to a line node in the editor buffer */
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line_t *
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get_addressed_line_node(n)
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long n;
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{
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static line_t *lp = &buffer_head;
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static long on = 0;
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SPL1();
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if (n > on)
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if (n <= (on + addr_last) >> 1)
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for (; on < n; on++)
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lp = lp->q_forw;
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else {
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lp = buffer_head.q_back;
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for (on = addr_last; on > n; on--)
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lp = lp->q_back;
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}
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else
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if (n >= on >> 1)
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for (; on > n; on--)
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lp = lp->q_back;
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else {
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lp = &buffer_head;
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for (on = 0; on < n; on++)
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lp = lp->q_forw;
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}
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SPL0();
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return lp;
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}
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extern int newline_added;
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char sfn[15] = ""; /* scratch file name */
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/* open_sbuf: open scratch file */
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int
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open_sbuf()
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{
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isbinary = newline_added = 0;
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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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fprintf(stderr, "%s: %s\n", sfn, strerror(errno));
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sprintf(errmsg, "cannot open temp file");
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return ERR;
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}
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return 0;
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}
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/* close_sbuf: close scratch file */
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int
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close_sbuf()
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{
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if (sfp) {
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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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sfp = NULL;
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unlink(sfn);
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}
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sfseek = seek_write = 0;
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return 0;
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}
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/* quit: remove_lines 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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fclose(sfp);
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unlink(sfn);
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}
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exit(n);
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}
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unsigned char ctab[256]; /* character translation table */
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/* init_buffers: open scratch buffer; initialize line queue */
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void
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init_buffers()
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{
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int i = 0;
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/* Read stdin one character at a time to avoid i/o contention
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with shell escapes invoked by nonterminal input, e.g.,
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ed - <<EOF
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!cat
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hello, world
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EOF */
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setbuffer(stdin, stdinbuf, 1);
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if (open_sbuf() < 0)
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quit(2);
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REQUE(&buffer_head, &buffer_head);
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for (i = 0; i < 256; i++)
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ctab[i] = i;
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}
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/* translit_text: translate characters in a string */
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char *
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translit_text(s, len, from, to)
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char *s;
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int len;
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int from;
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int to;
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{
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static int i = 0;
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unsigned char *us;
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ctab[i] = i; /* restore table to initial state */
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ctab[i = from] = to;
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for (us = (unsigned char *) s; len-- > 0; us++)
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*us = ctab[*us];
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return s;
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}
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