1 /* $OpenBSD: io.c,v 1.26 2024/07/16 05:01:10 deraadt Exp $ */
2 /* $NetBSD: io.c,v 1.2 1995/03/21 09:04:43 cgd Exp $ */
3
4 /* io.c: This file contains the i/o routines for the ed line editor */
5 /*-
6 * Copyright (c) 1993 Andrew Moore, Talke Studio.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #include <regex.h>
32 #include <signal.h>
33 #include <errno.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37
38 #include "ed.h"
39
40 static int read_stream(FILE *, int);
41 static int get_stream_line(FILE *);
42 static int write_stream(FILE *, int, int);
43 static int put_stream_line(FILE *, char *, int);
44
45 extern int scripted;
46
47 /* read_file: read a named file/pipe into the buffer; return line count */
48 int
read_file(char * fn,int n)49 read_file(char *fn, int n)
50 {
51 FILE *fp;
52 int size;
53
54
55 fp = (*fn == '!') ? popen(fn + 1, "r") : fopen(strip_escapes(fn), "r");
56 if (fp == NULL) {
57 perror(fn);
58 seterrmsg("cannot open input file");
59 return ERR;
60 } else if ((size = read_stream(fp, n)) < 0)
61 return ERR;
62 else if ((*fn == '!') ? pclose(fp) == -1 : fclose(fp) == EOF) {
63 perror(fn);
64 seterrmsg("cannot close input file");
65 return ERR;
66 }
67 if (!scripted)
68 printf("%d\n", size);
69 return current_addr - n;
70 }
71
72
73 static char *sbuf; /* file i/o buffer */
74 static int sbufsz; /* file i/o buffer size */
75 int newline_added; /* if set, newline appended to input file */
76
77 /* read_stream: read a stream into the editor buffer; return status */
78 static int
read_stream(FILE * fp,int n)79 read_stream(FILE *fp, int n)
80 {
81 line_t *lp = get_addressed_line_node(n);
82 undo_t *up = NULL;
83 unsigned int size = 0;
84 int o_newline_added = newline_added;
85 int o_isbinary = isbinary;
86 int appended = (n == addr_last);
87 int len;
88
89 isbinary = newline_added = 0;
90 for (current_addr = n; (len = get_stream_line(fp)) > 0; size += len) {
91 SPL1();
92 if (put_sbuf_line(sbuf) == NULL) {
93 SPL0();
94 return ERR;
95 }
96 lp = lp->q_forw;
97 if (up)
98 up->t = lp;
99 else if ((up = push_undo_stack(UADD, current_addr,
100 current_addr)) == NULL) {
101 SPL0();
102 return ERR;
103 }
104 SPL0();
105 }
106 if (len < 0)
107 return ERR;
108 if (appended && size && o_isbinary && o_newline_added)
109 fputs("newline inserted\n", stderr);
110 else if (newline_added && (!appended || (!isbinary && !o_isbinary)))
111 fputs("newline appended\n", stderr);
112 if (isbinary && newline_added && !appended)
113 size += 1;
114 if (!size)
115 newline_added = 1;
116 newline_added = appended ? newline_added : o_newline_added;
117 isbinary = isbinary | o_isbinary;
118 return size;
119 }
120
121 /* get_stream_line: read a line of text from a stream; return line length */
122 static int
get_stream_line(FILE * fp)123 get_stream_line(FILE *fp)
124 {
125 int c;
126 int i = 0;
127
128 while (((c = 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 perror(NULL);
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 */
151 int
write_file(char * fn,char * mode,int n,int m)152 write_file(char *fn, char *mode, int n, int m)
153 {
154 FILE *fp;
155 int size;
156
157 fp = (*fn == '!') ? popen(fn+1, "w") : fopen(strip_escapes(fn), mode);
158 if (fp == NULL) {
159 perror(fn);
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) == -1 : fclose(fp) == EOF) {
165 perror(fn);
166 seterrmsg("cannot close output file");
167 return ERR;
168 }
169 if (!scripted)
170 printf("%d\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 */
176 static int
write_stream(FILE * fp,int n,int m)177 write_stream(FILE *fp, int n, int m)
178 {
179 line_t *lp = get_addressed_line_node(n);
180 unsigned int size = 0;
181 char *s;
182 int len;
183
184 for (; n && n <= m; n++, lp = lp->q_forw) {
185 if ((s = get_sbuf_line(lp)) == NULL)
186 return ERR;
187 len = lp->len;
188 if (n != addr_last || !isbinary || !newline_added)
189 s[len++] = '\n';
190 if (put_stream_line(fp, s, len) < 0)
191 return ERR;
192 size += len;
193 }
194 return size;
195 }
196
197
198 /* put_stream_line: write a line of text to a stream; return status */
199 static int
put_stream_line(FILE * fp,char * s,int len)200 put_stream_line(FILE *fp, char *s, int len)
201 {
202 while (len--) {
203 if (fputc(*s, fp) == EOF) {
204 perror(NULL);
205 seterrmsg("cannot write file");
206 return ERR;
207 }
208 s++;
209 }
210 return 0;
211 }
212
213 /* get_extended_line: get a an extended line from stdin */
214 char *
get_extended_line(int * sizep,int nonl)215 get_extended_line(int *sizep, int nonl)
216 {
217 static char *cvbuf = NULL; /* buffer */
218 static int cvbufsz = 0; /* buffer size */
219
220 int l, n;
221 char *t = ibufp;
222
223 while (*t++ != '\n')
224 ;
225 if ((l = t - ibufp) < 2 || !has_trailing_escape(ibufp, ibufp + l - 1)) {
226 *sizep = l;
227 return ibufp;
228 }
229 *sizep = -1;
230 REALLOC(cvbuf, cvbufsz, l, NULL);
231 memcpy(cvbuf, ibufp, l);
232 *(cvbuf + --l - 1) = '\n'; /* strip trailing esc */
233 if (nonl)
234 l--; /* strip newline */
235 for (;;) {
236 if ((n = get_tty_line()) < 0)
237 return NULL;
238 else if (n == 0 || ibuf[n - 1] != '\n') {
239 seterrmsg("unexpected end-of-file");
240 return NULL;
241 }
242 REALLOC(cvbuf, cvbufsz, l + n, NULL);
243 memcpy(cvbuf + l, ibuf, n);
244 l += n;
245 if (n < 2 || !has_trailing_escape(cvbuf, cvbuf + l - 1))
246 break;
247 *(cvbuf + --l - 1) = '\n'; /* strip trailing esc */
248 if (nonl) l--; /* strip newline */
249 }
250 REALLOC(cvbuf, cvbufsz, l + 1, NULL);
251 cvbuf[l] = '\0';
252 *sizep = l;
253 return cvbuf;
254 }
255
256
257 /* get_tty_line: read a line of text from stdin; return line length */
258 int
get_tty_line(void)259 get_tty_line(void)
260 {
261 int oi = 0;
262 int i = 0;
263 int c;
264
265 for (;;) {
266 if (sighup)
267 handle_hup();
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 (sighup)
281 handle_hup();
282 if (ferror(stdin)) {
283 perror("stdin");
284 seterrmsg("cannot read stdin");
285 clearerr(stdin);
286 ibufp = NULL;
287 return ERR;
288 } else {
289 clearerr(stdin);
290 if (i != oi) {
291 oi = i;
292 continue;
293 } else if (i)
294 ibuf[i] = '\0';
295 ibufp = ibuf;
296 return i;
297 }
298 }
299 }
300 }
301
302
303
304 #define ESCAPES "\a\b\f\n\r\t\v\\$"
305 #define ESCCHARS "abfnrtv\\$"
306
307 extern int rows;
308 extern int cols;
309
310 /* put_tty_line: print text to stdout */
311 int
put_tty_line(char * s,int l,int n,int gflag)312 put_tty_line(char *s, int l, int n, int gflag)
313 {
314 int col = 0;
315 char *cp;
316
317 if (gflag & GNP) {
318 printf("%d\t", n);
319 col = 8;
320 }
321 for (; l--; s++) {
322 if ((gflag & GLS) && ++col > cols) {
323 fputs("\\\n", stdout);
324 col = 1;
325 }
326 if (gflag & GLS) {
327 if (31 < *s && *s < 127 && *s != '\\' && *s != '$')
328 putchar(*s);
329 else {
330 putchar('\\');
331 col++;
332 if (*s && (cp = strchr(ESCAPES, *s)) != NULL)
333 putchar(ESCCHARS[cp - ESCAPES]);
334 else {
335 putchar((((unsigned char) *s & 0300) >> 6) + '0');
336 putchar((((unsigned char) *s & 070) >> 3) + '0');
337 putchar(((unsigned char) *s & 07) + '0');
338 col += 2;
339 }
340 }
341
342 } else
343 putchar(*s);
344 }
345 if (gflag & GLS)
346 putchar('$');
347 putchar('\n');
348 return 0;
349 }
350