rc.conf.5: Adjust the memimg documentation a bit.
[dragonfly.git] / bin / ed / io.c
blobac3ace0ee27ec5140b8640ded694aafb82a4bfd5
1 /* io.c: This file contains the i/o routines for the ed line editor */
2 /*-
3 * Copyright (c) 1993 Andrew Moore, Talke Studio.
4 * All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
27 * @(#)io.c,v 1.1 1994/02/01 00:34:41 alm Exp
28 * $FreeBSD: head/bin/ed/io.c 300692 2016-05-25 18:38:30Z truckman $
31 #include "ed.h"
33 /* read_file: read a named file/pipe into the buffer; return line count */
34 long
35 read_file(char *fn, long n)
37 FILE *fp;
38 long size;
39 int cs;
41 fp = (*fn == '!') ? popen(fn + 1, "r") : fopen(strip_escapes(fn), "r");
42 if (fp == NULL) {
43 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
44 errmsg = "cannot open input file";
45 return ERR;
47 if ((size = read_stream(fp, n)) < 0) {
48 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
49 errmsg = "error reading input file";
51 if ((cs = (*fn == '!') ? pclose(fp) : fclose(fp)) < 0) {
52 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
53 errmsg = "cannot close input file";
55 if (size < 0 || cs < 0)
56 return ERR;
57 if (!scripted)
58 fprintf(stdout, "%lu\n", size);
59 return current_addr - n;
62 static char *sbuf; /* file i/o buffer */
63 static int sbufsz; /* file i/o buffer size */
64 int newline_added; /* if set, newline appended to input file */
66 /* read_stream: read a stream into the editor buffer; return status */
67 long
68 read_stream(FILE *fp, long n)
70 line_t *lp = get_addressed_line_node(n);
71 undo_t *up = NULL;
72 unsigned long size = 0;
73 int o_newline_added = newline_added;
74 int o_isbinary = isbinary;
75 int appended = (n == addr_last);
76 int len;
78 isbinary = newline_added = 0;
79 if (des)
80 init_des_cipher();
81 for (current_addr = n; (len = get_stream_line(fp)) > 0; size += len) {
82 SPL1();
83 if (put_sbuf_line(sbuf) == NULL) {
84 SPL0();
85 return ERR;
87 lp = lp->q_forw;
88 if (up)
89 up->t = lp;
90 else if ((up = push_undo_stack(UADD, current_addr,
91 current_addr)) == NULL) {
92 SPL0();
93 return ERR;
95 SPL0();
97 if (len < 0)
98 return ERR;
99 if (appended && size && o_isbinary && o_newline_added)
100 fputs("newline inserted\n", stderr);
101 else if (newline_added && (!appended || (!isbinary && !o_isbinary)))
102 fputs("newline appended\n", stderr);
103 if (isbinary && newline_added && !appended)
104 size += 1;
105 if (!size)
106 newline_added = 1;
107 newline_added = appended ? newline_added : o_newline_added;
108 isbinary = isbinary | o_isbinary;
109 if (des)
110 size += 8 - size % 8; /* adjust DES size */
111 return size;
115 /* get_stream_line: read a line of text from a stream; return line length */
117 get_stream_line(FILE *fp)
119 int c;
120 int i = 0;
122 while (((c = des ? get_des_char(fp) : getc(fp)) != EOF || (!feof(fp) &&
123 !ferror(fp))) && c != '\n') {
124 REALLOC(sbuf, sbufsz, i + 1, ERR);
125 if (!(sbuf[i++] = c))
126 isbinary = 1;
128 REALLOC(sbuf, sbufsz, i + 2, ERR);
129 if (c == '\n')
130 sbuf[i++] = c;
131 else if (ferror(fp)) {
132 fprintf(stderr, "%s\n", strerror(errno));
133 errmsg = "cannot read input file";
134 return ERR;
135 } else if (i) {
136 sbuf[i++] = '\n';
137 newline_added = 1;
139 sbuf[i] = '\0';
140 return (isbinary && newline_added && i) ? --i : i;
144 /* write_file: write a range of lines to a named file/pipe; return line count */
145 long
146 write_file(char *fn, const char *mode, long n, long m)
148 FILE *fp;
149 long size;
150 int cs;
152 fp = (*fn == '!') ? popen(fn+1, "w") : fopen(strip_escapes(fn), mode);
153 if (fp == NULL) {
154 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
155 errmsg = "cannot open output file";
156 return ERR;
158 if ((size = write_stream(fp, n, m)) < 0) {
159 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
160 errmsg = "error writing output file";
162 if ((cs = (*fn == '!') ? pclose(fp) : fclose(fp)) < 0) {
163 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
164 errmsg = "cannot close output file";
166 if (size < 0 || cs < 0)
167 return ERR;
168 if (!scripted)
169 fprintf(stdout, "%lu\n", size);
170 return n ? m - n + 1 : 0;
174 /* write_stream: write a range of lines to a stream; return status */
175 long
176 write_stream(FILE *fp, long n, long m)
178 line_t *lp = get_addressed_line_node(n);
179 unsigned long size = 0;
180 char *s;
181 int len;
183 if (des)
184 init_des_cipher();
185 for (; n && n <= m; n++, lp = lp->q_forw) {
186 if ((s = get_sbuf_line(lp)) == NULL)
187 return ERR;
188 len = lp->len;
189 if (n != addr_last || !isbinary || !newline_added)
190 s[len++] = '\n';
191 if (put_stream_line(fp, s, len) < 0)
192 return ERR;
193 size += len;
195 if (des) {
196 flush_des_file(fp); /* flush buffer */
197 size += 8 - size % 8; /* adjust DES size */
199 return size;
203 /* put_stream_line: write a line of text to a stream; return status */
205 put_stream_line(FILE *fp, const char *s, int len)
207 while (len--)
208 if ((des ? put_des_char(*s++, fp) : fputc(*s++, fp)) < 0) {
209 fprintf(stderr, "%s\n", strerror(errno));
210 errmsg = "cannot write file";
211 return ERR;
213 return 0;
216 /* get_extended_line: get an extended line from stdin */
217 char *
218 get_extended_line(int *sizep, int nonl)
220 static char *cvbuf = NULL; /* buffer */
221 static int cvbufsz = 0; /* buffer size */
223 int l, n;
224 char *t = ibufp;
226 while (*t++ != '\n')
228 if ((l = t - ibufp) < 2 || !has_trailing_escape(ibufp, ibufp + l - 1)) {
229 *sizep = l;
230 return ibufp;
232 *sizep = -1;
233 REALLOC(cvbuf, cvbufsz, l, NULL);
234 memcpy(cvbuf, ibufp, l);
235 *(cvbuf + --l - 1) = '\n'; /* strip trailing esc */
236 if (nonl) l--; /* strip newline */
237 for (;;) {
238 if ((n = get_tty_line()) < 0)
239 return NULL;
240 else if (n == 0 || ibuf[n - 1] != '\n') {
241 errmsg = "unexpected end-of-file";
242 return NULL;
244 REALLOC(cvbuf, cvbufsz, l + n, NULL);
245 memcpy(cvbuf + l, ibuf, n);
246 l += n;
247 if (n < 2 || !has_trailing_escape(cvbuf, cvbuf + l - 1))
248 break;
249 *(cvbuf + --l - 1) = '\n'; /* strip trailing esc */
250 if (nonl) l--; /* strip newline */
252 REALLOC(cvbuf, cvbufsz, l + 1, NULL);
253 cvbuf[l] = '\0';
254 *sizep = l;
255 return cvbuf;
259 /* get_tty_line: read a line of text from stdin; return line length */
261 get_tty_line(void)
263 int oi = 0;
264 int i = 0;
265 int c;
267 for (;;)
268 switch (c = getchar()) {
269 default:
270 oi = 0;
271 REALLOC(ibuf, ibufsz, i + 2, ERR);
272 if (!(ibuf[i++] = c)) isbinary = 1;
273 if (c != '\n')
274 continue;
275 lineno++;
276 ibuf[i] = '\0';
277 ibufp = ibuf;
278 return i;
279 case EOF:
280 if (ferror(stdin)) {
281 fprintf(stderr, "stdin: %s\n", strerror(errno));
282 errmsg = "cannot read stdin";
283 clearerr(stdin);
284 ibufp = NULL;
285 return ERR;
286 } else {
287 clearerr(stdin);
288 if (i != oi) {
289 oi = i;
290 continue;
291 } else if (i)
292 ibuf[i] = '\0';
293 ibufp = ibuf;
294 return i;
301 #define ESCAPES "\a\b\f\n\r\t\v\\"
302 #define ESCCHARS "abfnrtv\\"
304 /* put_tty_line: print text to stdout */
306 put_tty_line(const char *s, int l, long n, int gflag)
308 int col = 0;
309 int lc = 0;
310 char *cp;
312 if (gflag & GNP) {
313 printf("%ld\t", n);
314 col = 8;
316 for (; l--; s++) {
317 if ((gflag & GLS) && ++col > cols) {
318 fputs("\\\n", stdout);
319 col = 1;
320 #ifndef BACKWARDS
321 if (!scripted && !isglobal && ++lc > rows) {
322 lc = 0;
323 fputs("Press <RETURN> to continue... ", stdout);
324 fflush(stdout);
325 if (get_tty_line() < 0)
326 return ERR;
328 #endif
330 if (gflag & GLS) {
331 if (31 < *s && *s < 127 && *s != '\\')
332 putchar(*s);
333 else {
334 putchar('\\');
335 col++;
336 if (*s && (cp = strchr(ESCAPES, *s)) != NULL)
337 putchar(ESCCHARS[cp - ESCAPES]);
338 else {
339 putchar((((unsigned char) *s & 0300) >> 6) + '0');
340 putchar((((unsigned char) *s & 070) >> 3) + '0');
341 putchar(((unsigned char) *s & 07) + '0');
342 col += 2;
346 } else
347 putchar(*s);
349 #ifndef BACKWARDS
350 if (gflag & GLS)
351 putchar('$');
352 #endif
353 putchar('\n');
354 return 0;