io.c revision 1.9.10.1 
1/*	$NetBSD: io.c,v 1.9.10.1 2014/08/19 23:45:11 tls Exp $	*/
2
3/* io.c: This file contains the i/o routines for the ed line editor */
4/*-
5 * Copyright (c) 1993 Andrew Moore, Talke Studio.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31#ifndef lint
32#if 0
33static char *rcsid = "@(#)io.c,v 1.1 1994/02/01 00:34:41 alm Exp";
34#else
35__RCSID("$NetBSD: io.c,v 1.9.10.1 2014/08/19 23:45:11 tls Exp $");
36#endif
37#endif /* not lint */
38
39#include "ed.h"
40
41
42/* read_file: read a named file/pipe into the buffer; return line count */
43long
44read_file(char *fn, long n)
45{
46	FILE *fp;
47	long size;
48
49
50	fp = (*fn == '!') ? popen(fn + 1, "r") : fopen(strip_escapes(fn), "r");
51	if (fp == NULL) {
52		fprintf(stderr, "%s: %s\n", fn, strerror(errno));
53		seterrmsg("cannot open input file");
54		return ERR;
55	} else if ((size = read_stream(fp, n)) < 0)
56		return ERR;
57	 else if (((*fn == '!') ?  pclose(fp) : fclose(fp)) < 0) {
58		fprintf(stderr, "%s: %s\n", fn, strerror(errno));
59		seterrmsg("cannot close input file");
60		return ERR;
61	}
62	if (!scripted)
63		fprintf(stderr, "%lu\n", size);
64	return current_addr - n;
65}
66
67
68char *sbuf;			/* file i/o buffer */
69int sbufsz;			/* file i/o buffer size */
70int newline_added;		/* if set, newline appended to input file */
71
72/* read_stream: read a stream into the editor buffer; return status */
73long
74read_stream(FILE *fp, long n)
75{
76	line_t *lp = get_addressed_line_node(n);
77	undo_t *up = NULL;
78	unsigned long size = 0;
79	int o_newline_added = newline_added;
80	int o_isbinary = isbinary;
81	int appended = (n == addr_last);
82	int len;
83
84	isbinary = newline_added = 0;
85	if (des)
86		init_des_cipher();
87	for (current_addr = n; (len = get_stream_line(fp)) > 0; size += len) {
88		SPL1();
89		if (put_sbuf_line(sbuf) == NULL) {
90			SPL0();
91			return ERR;
92		}
93		lp = lp->q_forw;
94		if (up)
95			up->t = lp;
96		else if ((up = push_undo_stack(UADD, current_addr,
97		    current_addr)) == NULL) {
98			SPL0();
99			return ERR;
100		}
101		SPL0();
102	}
103	if (len < 0)
104		return ERR;
105	if (appended && size && o_isbinary && o_newline_added)
106		fputs("newline inserted\n", stderr);
107	else if (newline_added && (!appended || (!isbinary && !o_isbinary)))
108		fputs("newline appended\n", stderr);
109	if (isbinary && newline_added && !appended)
110	    	size += 1;
111	if (!size)
112		newline_added = 1;
113	newline_added = appended ? newline_added : o_newline_added;
114	isbinary = isbinary | o_isbinary;
115	if (des)
116		size += 8 - size % 8;			/* adjust DES size */
117	return size;
118}
119
120
121/* get_stream_line: read a line of text from a stream; return line length */
122int
123get_stream_line(FILE *fp)
124{
125	int c;
126	int i = 0;
127
128	while (((c = des ? get_des_char(fp) : getc(fp)) != EOF || (!feof(fp) &&
129	    !ferror(fp))) && c != '\n') {
130		REALLOC(sbuf, sbufsz, i + 1, ERR);
131		if (!(sbuf[i++] = c))
132			isbinary = 1;
133	}
134	REALLOC(sbuf, sbufsz, i + 2, ERR);
135	if (c == '\n')
136		sbuf[i++] = c;
137	else if (ferror(fp)) {
138		fprintf(stderr, "%s\n", strerror(errno));
139		seterrmsg("cannot read input file");
140		return ERR;
141	} else if (i) {
142		sbuf[i++] = '\n';
143		newline_added = 1;
144	}
145	sbuf[i] = '\0';
146	return (isbinary && newline_added && i) ? --i : i;
147}
148
149
150/* write_file: write a range of lines to a named file/pipe; return line count */
151long
152write_file(const char *fn, const char *mode, long n, long m)
153{
154	FILE *fp;
155	long size;
156
157	fp = (*fn == '!') ? popen(fn+1, "w") : fopen(strip_escapes(fn), mode);
158	if (fp == NULL) {
159		fprintf(stderr, "%s: %s\n", fn, strerror(errno));
160		seterrmsg("cannot open output file");
161		return ERR;
162	} else if ((size = write_stream(fp, n, m)) < 0)
163		return ERR;
164	 else if (((*fn == '!') ?  pclose(fp) : fclose(fp)) < 0) {
165		fprintf(stderr, "%s: %s\n", fn, strerror(errno));
166		seterrmsg("cannot close output file");
167		return ERR;
168	}
169	if (!scripted)
170		fprintf(stderr, "%lu\n", size);
171	return n ? m - n + 1 : 0;
172}
173
174
175/* write_stream: write a range of lines to a stream; return status */
176long
177write_stream(FILE *fp, long n, long m)
178{
179	line_t *lp = get_addressed_line_node(n);
180	unsigned long size = 0;
181	char *s;
182	int len;
183
184	if (des)
185		init_des_cipher();
186	for (; n && n <= m; n++, lp = lp->q_forw) {
187		if ((s = get_sbuf_line(lp)) == NULL)
188			return ERR;
189		len = lp->len;
190		if (n != addr_last || !isbinary || !newline_added)
191			s[len++] = '\n';
192		if (put_stream_line(fp, s, len) < 0)
193			return ERR;
194		size += len;
195	}
196	if (des) {
197		flush_des_file(fp);			/* flush buffer */
198		size += 8 - size % 8;			/* adjust DES size */
199	}
200	return size;
201}
202
203
204/* put_stream_line: write a line of text to a stream; return status */
205int
206put_stream_line(FILE *fp, char *s, int len)
207{
208	while (len--)
209		if ((des ? put_des_char(*s++, fp) : fputc(*s++, fp)) < 0) {
210			fprintf(stderr, "%s\n", strerror(errno));
211			seterrmsg("cannot write file");
212			return ERR;
213		}
214	return 0;
215}
216
217/* get_extended_line: get a an extended line from stdin */
218char *
219get_extended_line(int *sizep, int nonl)
220{
221	static char *cvbuf = NULL;		/* buffer */
222	static int cvbufsz = 0;			/* buffer size */
223
224	int l, n;
225	char *t = ibufp;
226
227	while (*t++ != '\n')
228		;
229	if ((l = t - ibufp) < 2 || !has_trailing_escape(ibufp, ibufp + l - 1)) {
230		*sizep = l;
231		return ibufp;
232	}
233	*sizep = -1;
234	REALLOC(cvbuf, cvbufsz, l, NULL);
235	memcpy(cvbuf, ibufp, l);
236	*(cvbuf + --l - 1) = '\n'; 	/* strip trailing esc */
237	if (nonl) l--; 			/* strip newline */
238	for (;;) {
239		if ((n = get_tty_line()) < 0)
240			return NULL;
241		else if (n == 0 || ibuf[n - 1] != '\n') {
242			seterrmsg("unexpected end-of-file");
243			return NULL;
244		}
245		REALLOC(cvbuf, cvbufsz, l + n, NULL);
246		memcpy(cvbuf + l, ibuf, n);
247		l += n;
248		if (n < 2 || !has_trailing_escape(cvbuf, cvbuf + l - 1))
249			break;
250		*(cvbuf + --l - 1) = '\n'; 	/* strip trailing esc */
251		if (nonl) l--; 			/* strip newline */
252	}
253	REALLOC(cvbuf, cvbufsz, l + 1, NULL);
254	cvbuf[l] = '\0';
255	*sizep = l;
256	return cvbuf;
257}
258
259
260/* get_tty_line: read a line of text from stdin; return line length */
261int
262get_tty_line(void)
263{
264	int oi = 0;
265	int i = 0;
266	int c;
267
268	for (;;)
269		switch (c = getchar()) {
270		default:
271			oi = 0;
272			REALLOC(ibuf, ibufsz, i + 2, ERR);
273			if (!(ibuf[i++] = c)) isbinary = 1;
274			if (c != '\n')
275				continue;
276			lineno++;
277			ibuf[i] = '\0';
278			ibufp = ibuf;
279			return i;
280		case EOF:
281			if (ferror(stdin)) {
282				fprintf(stderr, "stdin: %s\n", strerror(errno));
283				seterrmsg("cannot read stdin");
284				clearerr(stdin);
285				ibufp = NULL;
286				return ERR;
287			} else {
288				clearerr(stdin);
289				if (i != oi) {
290					oi = i;
291					continue;
292				} else if (i)
293					ibuf[i] = '\0';
294				ibufp = ibuf;
295				return i;
296			}
297		}
298}
299
300
301
302#define ESCAPES "\a\b\f\n\r\t\v\\"
303#define ESCCHARS "abfnrtv\\"
304
305/* put_tty_line: print text to stdout */
306int
307put_tty_line(char *s, int l, long n, int gflag)
308{
309	int col = 0;
310	char *cp;
311#ifndef BACKWARDS
312	int lc = 0;
313#endif
314
315	if (gflag & GNP) {
316		printf("%ld\t", n);
317		col = 8;
318	}
319	for (; l--; s++) {
320		if ((gflag & GLS) && ++col > cols) {
321			fputs("\\\n", stdout);
322			col = 1;
323#ifndef BACKWARDS
324			if (!scripted && !isglobal && ++lc > rows) {
325				lc = 0;
326				fputs("Press <RETURN> to continue... ", stdout);
327				fflush(stdout);
328				if (get_tty_line() < 0)
329					return ERR;
330			}
331#endif
332		}
333		if (gflag & GLS) {
334			if (31 < *s && *s < 127 && *s != '\\')
335				putchar(*s);
336			else {
337				putchar('\\');
338				col++;
339				if (*s && (cp = strchr(ESCAPES, *s)) != NULL)
340					putchar(ESCCHARS[cp - ESCAPES]);
341				else {
342					putchar((((unsigned char) *s & 0300) >> 6) + '0');
343					putchar((((unsigned char) *s & 070) >> 3) + '0');
344					putchar(((unsigned char) *s & 07) + '0');
345					col += 2;
346				}
347			}
348
349		} else
350			putchar(*s);
351	}
352#ifndef BACKWARDS
353	if (gflag & GLS)
354		putchar('$');
355#endif
356	putchar('\n');
357	return 0;
358}
359