1 /* buf.c: This file contains the scratch-file buffer routines for the
4 * Copyright (c) 1993 Andrew Moore, Talke Studio.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * @(#)buf.c,v 1.4 1994/02/01 00:34:35 alm Exp
29 * $FreeBSD: head/bin/ed/buf.c 241737 2012-10-19 14:49:42Z ed $
38 static FILE *sfp; /* scratch file pointer */
39 static off_t sfseek; /* scratch file position */
40 static int seek_write; /* seek before writing */
41 static line_t buffer_head; /* incore buffer */
43 /* get_sbuf_line: get a line of text from the scratch file; return pointer
46 get_sbuf_line(line_t *lp)
48 static char *sfbuf = NULL; /* buffer */
49 static int sfbufsz = 0; /* buffer size */
53 if (lp == &buffer_head)
55 seek_write = 1; /* force seek on write */
57 if (sfseek != lp->seek) {
59 if (fseeko(sfp, sfseek, SEEK_SET) < 0) {
60 fprintf(stderr, "%s\n", strerror(errno));
61 errmsg = "cannot seek temp file";
66 REALLOC(sfbuf, sfbufsz, len + 1, NULL);
67 if ((ct = fread(sfbuf, sizeof(char), len, sfp)) < 0 || ct != len) {
68 fprintf(stderr, "%s\n", strerror(errno));
69 errmsg = "cannot read temp file";
72 sfseek += len; /* update file position */
78 /* put_sbuf_line: write a line of text to the scratch file and add a line node
79 to the editor buffer; return a pointer to the end of the text */
81 put_sbuf_line(const char *cs)
87 if ((lp = (line_t *) malloc(sizeof(line_t))) == NULL) {
88 fprintf(stderr, "%s\n", strerror(errno));
89 errmsg = "out of memory";
92 /* assert: cs is '\n' terminated */
93 for (s = cs; *s != '\n'; s++)
95 if (s - cs >= LINECHARS) {
96 errmsg = "line too long";
101 /* out of position */
103 if (fseeko(sfp, (off_t)0, SEEK_END) < 0) {
104 fprintf(stderr, "%s\n", strerror(errno));
105 errmsg = "cannot seek temp file";
109 sfseek = ftello(sfp);
113 if ((ct = fwrite(cs, sizeof(char), len, sfp)) < 0 || ct != len) {
115 fprintf(stderr, "%s\n", strerror(errno));
116 errmsg = "cannot write temp file";
123 sfseek += len; /* update file position */
128 /* add_line_node: add a line node in the editor buffer after the current line */
130 add_line_node(line_t *lp)
134 cp = get_addressed_line_node(current_addr); /* this get_addressed_line_node last! */
141 /* get_line_node_addr: return line number of pointer */
143 get_line_node_addr(line_t *lp)
145 line_t *cp = &buffer_head;
148 while (cp != lp && (cp = cp->q_forw) != &buffer_head)
150 if (n && cp == &buffer_head) {
151 errmsg = "invalid address";
158 /* get_addressed_line_node: return pointer to a line node in the editor buffer */
160 get_addressed_line_node(long n)
162 static line_t *lp = &buffer_head;
167 if (n <= (on + addr_last) >> 1)
171 lp = buffer_head.q_back;
172 for (on = addr_last; on > n; on--)
181 for (on = 0; on < n; on++)
188 static char sfn[15] = ""; /* scratch file name */
190 /* open_sbuf: open scratch file */
197 isbinary = newline_added = 0;
199 strcpy(sfn, "/tmp/ed.XXXXXX");
200 if ((fd = mkstemp(sfn)) == -1 ||
201 (sfp = fdopen(fd, "w+")) == NULL) {
205 errmsg = "cannot open temp file";
214 /* close_sbuf: close scratch file */
219 if (fclose(sfp) < 0) {
220 fprintf(stderr, "%s: %s\n", sfn, strerror(errno));
221 errmsg = "cannot close temp file";
227 sfseek = seek_write = 0;
232 /* quit: remove_lines scratch file and exit */
244 static unsigned char ctab[256]; /* character translation table */
246 /* init_buffers: open scratch buffer; initialize line queue */
252 /* Read stdin one character at a time to avoid i/o contention
253 with shell escapes invoked by nonterminal input, e.g.,
258 setbuffer(stdin, stdinbuf, 1);
260 /* Ensure stdout is line buffered. This avoids bogus delays
261 of output if stdout is piped through utilities to a terminal. */
262 setvbuf(stdout, NULL, _IOLBF, 0);
265 REQUE(&buffer_head, &buffer_head);
266 for (i = 0; i < 256; i++)
271 /* translit_text: translate characters in a string */
273 translit_text(char *s, int len, int from, int to)
279 ctab[i] = i; /* restore table to initial state */
281 for (us = (unsigned char *) s; len-- > 0; us++)