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 #include "ed.h"
30
31 /* read_file: read a named file/pipe into the buffer; return line count */
32 long
read_file(char * fn,long n)33 read_file(char *fn, long n)
34 {
35 FILE *fp;
36 long size;
37 int cs;
38
39 fp = (*fn == '!') ? popen(fn + 1, "r") : fopen(strip_escapes(fn), "r");
40 if (fp == NULL) {
41 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
42 errmsg = "cannot open input file";
43 return ERR;
44 }
45 if ((size = read_stream(fp, n)) < 0) {
46 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
47 errmsg = "error reading input file";
48 }
49 if ((cs = (*fn == '!') ? pclose(fp) : fclose(fp)) < 0) {
50 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
51 errmsg = "cannot close input file";
52 }
53 if (size < 0 || cs < 0)
54 return ERR;
55 if (!scripted)
56 fprintf(stdout, "%lu\n", size);
57 return current_addr - n;
58 }
59
60 static char *sbuf; /* file i/o buffer */
61 static int sbufsz; /* file i/o buffer size */
62 int newline_added; /* if set, newline appended to input file */
63
64 /* read_stream: read a stream into the editor buffer; return status */
65 long
read_stream(FILE * fp,long n)66 read_stream(FILE *fp, long n)
67 {
68 line_t *lp = get_addressed_line_node(n);
69 undo_t *up = NULL;
70 unsigned long size = 0;
71 int o_newline_added = newline_added;
72 int o_isbinary = isbinary;
73 int appended = (n == addr_last);
74 int len;
75
76 isbinary = newline_added = 0;
77 for (current_addr = n; (len = get_stream_line(fp)) > 0; size += len) {
78 SPL1();
79 if (put_sbuf_line(sbuf) == NULL) {
80 SPL0();
81 return ERR;
82 }
83 lp = lp->q_forw;
84 if (up)
85 up->t = lp;
86 else if ((up = push_undo_stack(UADD, current_addr,
87 current_addr)) == NULL) {
88 SPL0();
89 return ERR;
90 }
91 SPL0();
92 }
93 if (len < 0)
94 return ERR;
95 if (appended && size && o_isbinary && o_newline_added)
96 fputs("newline inserted\n", stderr);
97 else if (newline_added && (!appended || (!isbinary && !o_isbinary)))
98 fputs("newline appended\n", stderr);
99 if (isbinary && newline_added && !appended)
100 size += 1;
101 if (!size)
102 newline_added = 1;
103 newline_added = appended ? newline_added : o_newline_added;
104 isbinary = isbinary | o_isbinary;
105 return size;
106 }
107
108
109 /* get_stream_line: read a line of text from a stream; return line length */
110 int
get_stream_line(FILE * fp)111 get_stream_line(FILE *fp)
112 {
113 int c;
114 int i = 0;
115
116 while (((c = getc(fp)) != EOF || (!feof(fp) && !ferror(fp))) &&
117 c != '\n') {
118 REALLOC(sbuf, sbufsz, i + 1, ERR);
119 if (!(sbuf[i++] = c))
120 isbinary = 1;
121 }
122 REALLOC(sbuf, sbufsz, i + 2, ERR);
123 if (c == '\n')
124 sbuf[i++] = c;
125 else if (ferror(fp)) {
126 fprintf(stderr, "%s\n", strerror(errno));
127 errmsg = "cannot read input file";
128 return ERR;
129 } else if (i) {
130 sbuf[i++] = '\n';
131 newline_added = 1;
132 }
133 sbuf[i] = '\0';
134 return (isbinary && newline_added && i) ? --i : i;
135 }
136
137
138 /* write_file: write a range of lines to a named file/pipe; return line count */
139 long
write_file(char * fn,const char * mode,long n,long m)140 write_file(char *fn, const char *mode, long n, long m)
141 {
142 FILE *fp;
143 long size;
144 int cs;
145
146 fp = (*fn == '!') ? popen(fn+1, "w") : fopen(strip_escapes(fn), mode);
147 if (fp == NULL) {
148 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
149 errmsg = "cannot open output file";
150 return ERR;
151 }
152 if ((size = write_stream(fp, n, m)) < 0) {
153 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
154 errmsg = "error writing output file";
155 }
156 if ((cs = (*fn == '!') ? pclose(fp) : fclose(fp)) < 0) {
157 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
158 errmsg = "cannot close output file";
159 }
160 if (size < 0 || cs < 0)
161 return ERR;
162 if (!scripted)
163 fprintf(stdout, "%lu\n", size);
164 return n ? m - n + 1 : 0;
165 }
166
167
168 /* write_stream: write a range of lines to a stream; return status */
169 long
write_stream(FILE * fp,long n,long m)170 write_stream(FILE *fp, long n, long m)
171 {
172 line_t *lp = get_addressed_line_node(n);
173 unsigned long size = 0;
174 char *s;
175 int len;
176
177 for (; n && n <= m; n++, lp = lp->q_forw) {
178 if ((s = get_sbuf_line(lp)) == NULL)
179 return ERR;
180 len = lp->len;
181 if (n != addr_last || !isbinary || !newline_added)
182 s[len++] = '\n';
183 if (put_stream_line(fp, s, len) < 0)
184 return ERR;
185 size += len;
186 }
187 return size;
188 }
189
190
191 /* put_stream_line: write a line of text to a stream; return status */
192 int
put_stream_line(FILE * fp,const char * s,int len)193 put_stream_line(FILE *fp, const char *s, int len)
194 {
195 while (len--)
196 if (fputc(*s++, fp) < 0) {
197 fprintf(stderr, "%s\n", strerror(errno));
198 errmsg = "cannot write file";
199 return ERR;
200 }
201 return 0;
202 }
203
204 /* get_extended_line: get an extended line from stdin */
205 char *
get_extended_line(int * sizep,int nonl)206 get_extended_line(int *sizep, int nonl)
207 {
208 static char *cvbuf = NULL; /* buffer */
209 static int cvbufsz = 0; /* buffer size */
210
211 int l, n;
212 char *t = ibufp;
213
214 while (*t++ != '\n')
215 ;
216 if ((l = t - ibufp) < 2 || !has_trailing_escape(ibufp, ibufp + l - 1)) {
217 *sizep = l;
218 return ibufp;
219 }
220 *sizep = -1;
221 REALLOC(cvbuf, cvbufsz, l, NULL);
222 memcpy(cvbuf, ibufp, l);
223 *(cvbuf + --l - 1) = '\n'; /* strip trailing esc */
224 if (nonl) l--; /* strip newline */
225 for (;;) {
226 if ((n = get_tty_line()) < 0)
227 return NULL;
228 else if (n == 0 || ibuf[n - 1] != '\n') {
229 errmsg = "unexpected end-of-file";
230 return NULL;
231 }
232 REALLOC(cvbuf, cvbufsz, l + n, NULL);
233 memcpy(cvbuf + l, ibuf, n);
234 l += n;
235 if (n < 2 || !has_trailing_escape(cvbuf, cvbuf + l - 1))
236 break;
237 *(cvbuf + --l - 1) = '\n'; /* strip trailing esc */
238 if (nonl) l--; /* strip newline */
239 }
240 REALLOC(cvbuf, cvbufsz, l + 1, NULL);
241 cvbuf[l] = '\0';
242 *sizep = l;
243 return cvbuf;
244 }
245
246
247 /* get_tty_line: read a line of text from stdin; return line length */
248 int
get_tty_line(void)249 get_tty_line(void)
250 {
251 int oi = 0;
252 int i = 0;
253 int c;
254
255 for (;;)
256 switch (c = getchar()) {
257 default:
258 oi = 0;
259 REALLOC(ibuf, ibufsz, i + 2, ERR);
260 if (!(ibuf[i++] = c)) isbinary = 1;
261 if (c != '\n')
262 continue;
263 lineno++;
264 ibuf[i] = '\0';
265 ibufp = ibuf;
266 return i;
267 case EOF:
268 if (ferror(stdin)) {
269 fprintf(stderr, "stdin: %s\n", strerror(errno));
270 errmsg = "cannot read stdin";
271 clearerr(stdin);
272 ibufp = NULL;
273 return ERR;
274 } else {
275 clearerr(stdin);
276 if (i != oi) {
277 oi = i;
278 continue;
279 } else if (i)
280 ibuf[i] = '\0';
281 ibufp = ibuf;
282 return i;
283 }
284 }
285 }
286
287
288
289 #define ESCAPES "\a\b\f\n\r\t\v\\"
290 #define ESCCHARS "abfnrtv\\"
291
292 /* put_tty_line: print text to stdout */
293 int
put_tty_line(const char * s,int l,long n,int gflag)294 put_tty_line(const char *s, int l, long n, int gflag)
295 {
296 int col = 0;
297 int lc = 0;
298 char *cp;
299
300 if (gflag & GNP) {
301 printf("%ld\t", n);
302 col = 8;
303 }
304 for (; l--; s++) {
305 if ((gflag & GLS) && ++col > cols) {
306 fputs("\\\n", stdout);
307 col = 1;
308 #ifndef BACKWARDS
309 if (!scripted && !isglobal && ++lc > rows) {
310 lc = 0;
311 fputs("Press <RETURN> to continue... ", stdout);
312 fflush(stdout);
313 if (get_tty_line() < 0)
314 return ERR;
315 }
316 #endif
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 #ifndef BACKWARDS
338 if (gflag & GLS)
339 putchar('$');
340 #endif
341 putchar('\n');
342 return 0;
343 }
344