io.c
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.
5 *
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.
14 *
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.
26 */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD: src/bin/ed/io.c,v 1.14 2003/01/01 18:48:39 schweikh Exp $");
30
31 #include "ed.h"
32
33
34 extern int scripted;
35
36 /* read_file: read a named file/pipe into the buffer; return line count */
37 long
38 read_file(char *fn, long n)
39 {
40 FILE *fp;
41 long size;
42
43
44 fp = (*fn == '!') ? popen(fn + 1, "r") : fopen(strip_escapes(fn), "r");
45 if (fp == NULL) {
46 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
47 errmsg = "cannot open input file";
48 return ERR;
49 } else if ((size = read_stream(fp, n)) < 0)
50 return ERR;
51 else if (((*fn == '!') ? pclose(fp) : fclose(fp)) < 0) {
52 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
53 errmsg = "cannot close input file";
54 return ERR;
55 }
56 fprintf(stdout, !scripted ? "%lu\n" : "", size);
57 return current_addr - n;
58 }
59
60
61 extern int des;
62
63 char *sbuf; /* file i/o buffer */
64 int sbufsz; /* file i/o buffer size */
65 int newline_added; /* if set, newline appended to input file */
66
67 /* read_stream: read a stream into the editor buffer; return status */
68 long
69 read_stream(FILE *fp, long n)
70 {
71 line_t *lp = get_addressed_line_node(n);
72 undo_t *up = NULL;
73 unsigned long size = 0;
74 int o_newline_added = newline_added;
75 int o_isbinary = isbinary;
76 int appended = (n == addr_last);
77 int len;
78
79 isbinary = newline_added = 0;
80 if (des)
81 init_des_cipher();
82 for (current_addr = n; (len = get_stream_line(fp)) > 0; size += len) {
83 SPL1();
84 if (put_sbuf_line(sbuf) == NULL) {
85 SPL0();
86 return ERR;
87 }
88 lp = lp->q_forw;
89 if (up)
90 up->t = lp;
91 else if ((up = push_undo_stack(UADD, current_addr,
92 current_addr)) == NULL) {
93 SPL0();
94 return ERR;
95 }
96 SPL0();
97 }
98 if (len < 0)
99 return ERR;
100 if (appended && size && o_isbinary && o_newline_added)
101 fputs("newline inserted\n", stderr);
102 else if (newline_added && (!appended || (!isbinary && !o_isbinary)))
103 fputs("newline appended\n", stderr);
104 if (isbinary && newline_added && !appended)
105 size += 1;
106 if (!size)
107 newline_added = 1;
108 newline_added = appended ? newline_added : o_newline_added;
109 isbinary = isbinary | o_isbinary;
110 if (des)
111 size += 8 - size % 8; /* adjust DES size */
112 return size;
113 }
114
115
116 /* get_stream_line: read a line of text from a stream; return line length */
117 int
118 get_stream_line(FILE *fp)
119 {
120 int c;
121 int i = 0;
122
123 while (((c = des ? get_des_char(fp) : getc(fp)) != EOF || (!feof(fp) &&
124 !ferror(fp))) && c != '\n') {
125 REALLOC(sbuf, sbufsz, i + 1, ERR);
126 if (!(sbuf[i++] = c))
127 isbinary = 1;
128 }
129 REALLOC(sbuf, sbufsz, i + 2, ERR);
130 if (c == '\n')
131 sbuf[i++] = c;
132 else if (ferror(fp)) {
133 fprintf(stderr, "%s\n", strerror(errno));
134 errmsg = "cannot read input file";
135 return ERR;
136 } else if (i) {
137 sbuf[i++] = '\n';
138 newline_added = 1;
139 }
140 sbuf[i] = '\0';
141 return (isbinary && newline_added && i) ? --i : i;
142 }
143
144
145 /* write_file: write a range of lines to a named file/pipe; return line count */
146 long
147 write_file(char *fn, const char *mode, long n, long m)
148 {
149 FILE *fp;
150 long size;
151
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;
157 } else if ((size = write_stream(fp, n, m)) < 0)
158 return ERR;
159 else if (((*fn == '!') ? pclose(fp) : fclose(fp)) < 0) {
160 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
161 errmsg = "cannot close output file";
162 return ERR;
163 }
164 fprintf(stdout, !scripted ? "%lu\n" : "", size);
165 return n ? m - n + 1 : 0;
166 }
167
168
169 /* write_stream: write a range of lines to a stream; return status */
170 long
171 write_stream(FILE *fp, long n, long m)
172 {
173 line_t *lp = get_addressed_line_node(n);
174 unsigned long size = 0;
175 char *s;
176 int len;
177
178 if (des)
179 init_des_cipher();
180 for (; n && n <= m; n++, lp = lp->q_forw) {
181 if ((s = get_sbuf_line(lp)) == NULL)
182 return ERR;
183 len = lp->len;
184 if (n != addr_last || !isbinary || !newline_added)
185 s[len++] = '\n';
186 if (put_stream_line(fp, s, len) < 0)
187 return ERR;
188 size += len;
189 }
190 if (des) {
191 flush_des_file(fp); /* flush buffer */
192 size += 8 - size % 8; /* adjust DES size */
193 }
194 return size;
195 }
196
197
198 /* put_stream_line: write a line of text to a stream; return status */
199 int
200 put_stream_line(FILE *fp, const char *s, int len)
201 {
202 while (len--)
203 if ((des ? put_des_char(*s++, fp) : fputc(*s++, fp)) < 0) {
204 fprintf(stderr, "%s\n", strerror(errno));
205 errmsg = "cannot write file";
206 return ERR;
207 }
208 return 0;
209 }
210
211 /* get_extended_line: get an extended line from stdin */
212 char *
213 get_extended_line(int *sizep, int nonl)
214 {
215 static char *cvbuf = NULL; /* buffer */
216 static int cvbufsz = 0; /* buffer size */
217
218 int l, n;
219 char *t = ibufp;
220
221 while (*t++ != '\n')
222 ;
223 if ((l = t - ibufp) < 2 || !has_trailing_escape(ibufp, ibufp + l - 1)) {
224 *sizep = l;
225 return ibufp;
226 }
227 *sizep = -1;
228 REALLOC(cvbuf, cvbufsz, l, NULL);
229 memcpy(cvbuf, ibufp, l);
230 *(cvbuf + --l - 1) = '\n'; /* strip trailing esc */
231 if (nonl) l--; /* strip newline */
232 for (;;) {
233 if ((n = get_tty_line()) < 0)
234 return NULL;
235 else if (n == 0 || ibuf[n - 1] != '\n') {
236 errmsg = "unexpected end-of-file";
237 return NULL;
238 }
239 REALLOC(cvbuf, cvbufsz, l + n, NULL);
240 memcpy(cvbuf + l, ibuf, n);
241 l += n;
242 if (n < 2 || !has_trailing_escape(cvbuf, cvbuf + l - 1))
243 break;
244 *(cvbuf + --l - 1) = '\n'; /* strip trailing esc */
245 if (nonl) l--; /* strip newline */
246 }
247 REALLOC(cvbuf, cvbufsz, l + 1, NULL);
248 cvbuf[l] = '\0';
249 *sizep = l;
250 return cvbuf;
251 }
252
253
254 /* get_tty_line: read a line of text from stdin; return line length */
255 int
256 get_tty_line(void)
257 {
258 int oi = 0;
259 int i = 0;
260 int c;
261
262 for (;;)
263 switch (c = getchar()) {
264 default:
265 oi = 0;
266 REALLOC(ibuf, ibufsz, i + 2, ERR);
267 if (!(ibuf[i++] = c)) isbinary = 1;
268 if (c != '\n')
269 continue;
270 lineno++;
271 ibuf[i] = '\0';
272 ibufp = ibuf;
273 return i;
274 case EOF:
275 if (ferror(stdin)) {
276 fprintf(stderr, "stdin: %s\n", strerror(errno));
277 errmsg = "cannot read stdin";
278 clearerr(stdin);
279 ibufp = NULL;
280 return ERR;
281 } else {
282 clearerr(stdin);
283 if (i != oi) {
284 oi = i;
285 continue;
286 } else if (i)
287 ibuf[i] = '\0';
288 ibufp = ibuf;
289 return i;
290 }
291 }
292 }
293
294
295
296 #define ESCAPES "\a\b\f\n\r\t\v\\"
297 #define ESCCHARS "abfnrtv\\"
298
299 extern int rows;
300 extern int cols;
301
302 /* put_tty_line: print text to stdout */
303 int
304 put_tty_line(const char *s, int l, long n, int gflag)
305 {
306 int col = 0;
307 char *cp;
308
309 if ((gflag & GNP) && !(gflag & GINT)) {
310 printf("%ld\t", n);
311 col = 8;
312 }
313 for (; l--; s++) {
314 if ((gflag & GLS) && ++col > cols) {
315 fputs("\\\n", stdout);
316 col = 1;
317 }
318 if (gflag & GLS) {
319 if (31 < *s && *s < 127 && *s != '\\')
320 putchar(*s);
321 else {
322 putchar('\\');
323 col++;
324 if (*s && (cp = strchr(ESCAPES, *s)) != NULL)
325 putchar(ESCCHARS[cp - ESCAPES]);
326 else {
327 putchar((((unsigned char) *s & 0300) >> 6) + '0');
328 putchar((((unsigned char) *s & 070) >> 3) + '0');
329 putchar(((unsigned char) *s & 07) + '0');
330 col += 2;
331 }
332 }
333
334 } else
335 putchar(*s);
336 }
337 if (posixly_correct && (gflag & GLS) && !(gflag & GINT))
338 putchar('$');
339 putchar('\n');
340 return 0;
341 }
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