xref: /freebsd/bin/ed/io.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
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("$FreeBSD$");
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 	int lc = 0;
308 	char *cp;
309 
310 	if (gflag & GNP) {
311 		printf("%ld\t", n);
312 		col = 8;
313 	}
314 	for (; l--; s++) {
315 		if ((gflag & GLS) && ++col > cols) {
316 			fputs("\\\n", stdout);
317 			col = 1;
318 #ifndef BACKWARDS
319 			if (!scripted && !isglobal && ++lc > rows) {
320 				lc = 0;
321 				fputs("Press <RETURN> to continue... ", stdout);
322 				fflush(stdout);
323 				if (get_tty_line() < 0)
324 					return ERR;
325 			}
326 #endif
327 		}
328 		if (gflag & GLS) {
329 			if (31 < *s && *s < 127 && *s != '\\')
330 				putchar(*s);
331 			else {
332 				putchar('\\');
333 				col++;
334 				if (*s && (cp = strchr(ESCAPES, *s)) != NULL)
335 					putchar(ESCCHARS[cp - ESCAPES]);
336 				else {
337 					putchar((((unsigned char) *s & 0300) >> 6) + '0');
338 					putchar((((unsigned char) *s & 070) >> 3) + '0');
339 					putchar(((unsigned char) *s & 07) + '0');
340 					col += 2;
341 				}
342 			}
343 
344 		} else
345 			putchar(*s);
346 	}
347 #ifndef BACKWARDS
348 	if (gflag & GLS)
349 		putchar('$');
350 #endif
351 	putchar('\n');
352 	return 0;
353 }
354