1 /* $OpenBSD: main.c,v 1.47 2024/07/17 20:57:16 millert Exp $ */
2
3 /*-
4 * Copyright (c) 1992 Diomidis Spinellis.
5 * Copyright (c) 1992, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Diomidis Spinellis of Imperial College, University of London.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <sys/types.h>
37 #include <sys/ioctl.h>
38 #include <sys/stat.h>
39
40 #include <ctype.h>
41 #include <err.h>
42 #include <errno.h>
43 #include <fcntl.h>
44 #include <limits.h>
45 #include <regex.h>
46 #include <stddef.h>
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <string.h>
50 #include <unistd.h>
51 #include <libgen.h>
52
53 #include "defs.h"
54 #include "extern.h"
55
56 /*
57 * Linked list of units (strings and files) to be compiled
58 */
59 struct s_compunit {
60 struct s_compunit *next;
61 enum e_cut {CU_FILE, CU_STRING} type;
62 char *s; /* Pointer to string or fname */
63 };
64
65 /*
66 * Linked list pointer to compilation units and pointer to current
67 * next pointer.
68 */
69 static struct s_compunit *script, **cu_nextp = &script;
70
71 /*
72 * Linked list of files to be processed
73 */
74 struct s_flist {
75 char *fname;
76 struct s_flist *next;
77 };
78
79 /*
80 * Linked list pointer to files and pointer to current
81 * next pointer.
82 */
83 static struct s_flist *files, **fl_nextp = &files;
84
85 FILE *infile; /* Current input file */
86 FILE *outfile; /* Current output file */
87
88 int Eflag, aflag, eflag, nflag;
89 static int rval; /* Exit status */
90
91 /*
92 * Current file and line number; line numbers restart across compilation
93 * units, but span across input files. The latter is optional if editing
94 * in place.
95 */
96 const char *fname; /* File name. */
97 const char *outfname; /* Output file name */
98 static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */
99 static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */
100 char *inplace; /* Inplace edit file extension */
101 u_long linenum;
102
103 static void add_compunit(enum e_cut, char *);
104 static void add_file(char *);
105 static int next_files_have_lines(void);
106
107 int termwidth;
108
109 int pledge_wpath, pledge_rpath;
110
111 int
main(int argc,char * argv[])112 main(int argc, char *argv[])
113 {
114 struct winsize win;
115 int c, fflag;
116 char *p;
117
118 fflag = 0;
119 inplace = NULL;
120 while ((c = getopt(argc, argv, "Eae:f:i::nru")) != -1)
121 switch (c) {
122 case 'E':
123 case 'r':
124 Eflag = 1;
125 break;
126 case 'a':
127 aflag = 1;
128 break;
129 case 'e':
130 eflag = 1;
131 add_compunit(CU_STRING, optarg);
132 break;
133 case 'f':
134 fflag = 1;
135 add_compunit(CU_FILE, optarg);
136 break;
137 case 'i':
138 inplace = optarg ? optarg : "";
139 break;
140 case 'n':
141 nflag = 1;
142 break;
143 case 'u':
144 setvbuf(stdout, NULL, _IOLBF, 0);
145 break;
146 default:
147 (void)fprintf(stderr,
148 "usage: sed [-aEnru] [-i[extension]] command [file ...]\n"
149 " sed [-aEnru] [-e command] [-f command_file] [-i[extension]] [file ...]\n");
150 exit(1);
151 }
152 argc -= optind;
153 argv += optind;
154
155 termwidth = 0;
156 if ((p = getenv("COLUMNS")) != NULL)
157 termwidth = strtonum(p, 0, INT_MAX, NULL);
158 if (termwidth == 0 && ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == 0 &&
159 win.ws_col > 0)
160 termwidth = win.ws_col;
161 if (termwidth == 0)
162 termwidth = 80;
163 if (termwidth <= 8)
164 termwidth = 1;
165 else
166 termwidth -= 8;
167
168 if (inplace != NULL) {
169 if (pledge("stdio rpath wpath cpath fattr chown", NULL) == -1)
170 err(1, "pledge");
171 } else {
172 if (pledge("stdio rpath wpath cpath", NULL) == -1)
173 err(1, "pledge");
174 }
175
176 /* First usage case; script is the first arg */
177 if (!eflag && !fflag && *argv) {
178 add_compunit(CU_STRING, *argv);
179 argv++;
180 }
181
182 compile();
183
184 /* Continue with first and start second usage */
185 if (*argv) {
186 if (!pledge_wpath && inplace == NULL) {
187 if (pledge("stdio rpath", NULL) == -1)
188 err(1, "pledge");
189 }
190 for (; *argv; argv++)
191 add_file(*argv);
192 } else {
193 if (!pledge_wpath && !pledge_rpath) {
194 if (pledge("stdio", NULL) == -1)
195 err(1, "pledge");
196 } else if (pledge_rpath) {
197 if (pledge("stdio rpath", NULL) == -1)
198 err(1, "pledge");
199 } else if (pledge_wpath) {
200 if (pledge("stdio wpath cpath", NULL) == -1)
201 err(1, "pledge");
202 }
203 add_file(NULL);
204 }
205 process();
206 cfclose(prog, NULL);
207 if (fclose(stdout))
208 err(1, "stdout");
209 exit (rval);
210 }
211
212 /*
213 * Like getline, but go through the chain of compilation units chaining them
214 * together. Empty strings and files are ignored.
215 */
216 char *
cu_getline(char ** outbuf,size_t * outsize)217 cu_getline(char **outbuf, size_t *outsize)
218 {
219 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
220 static FILE *f; /* Current open file */
221 static char *s; /* Current pointer inside string */
222 static char string_ident[30];
223 size_t len;
224 char *p;
225
226 if (*outbuf == NULL)
227 *outsize = 0;
228
229 again:
230 switch (state) {
231 case ST_EOF:
232 if (script == NULL)
233 return (NULL);
234 linenum = 0;
235 switch (script->type) {
236 case CU_FILE:
237 if ((f = fopen(script->s, "r")) == NULL)
238 err(1, "%s", script->s);
239 fname = script->s;
240 state = ST_FILE;
241 goto again;
242 case CU_STRING:
243 len = snprintf(string_ident, sizeof(string_ident),
244 "\"%s\"", script->s);
245 if (len >= sizeof(string_ident))
246 strlcpy(string_ident +
247 sizeof(string_ident) - 6, " ...\"", 5);
248 fname = string_ident;
249 s = script->s;
250 state = ST_STRING;
251 goto again;
252 }
253 case ST_FILE:
254 if (getline(outbuf, outsize, f) != -1) {
255 p = *outbuf;
256 linenum++;
257 if (linenum == 1 && p[0] == '#' && p[1] == 'n')
258 nflag = 1;
259 return (*outbuf);
260 }
261 script = script->next;
262 (void)fclose(f);
263 state = ST_EOF;
264 goto again;
265 case ST_STRING:
266 if (linenum == 0 && s[0] == '#' && s[1] == 'n')
267 nflag = 1;
268 p = *outbuf;
269 len = *outsize;
270 for (;;) {
271 if (len <= 1) {
272 *outbuf = xrealloc(*outbuf,
273 *outsize + _POSIX2_LINE_MAX);
274 p = *outbuf + *outsize - len;
275 len += _POSIX2_LINE_MAX;
276 *outsize += _POSIX2_LINE_MAX;
277 }
278 switch (*s) {
279 case '\0':
280 state = ST_EOF;
281 if (s == script->s) {
282 script = script->next;
283 goto again;
284 } else {
285 script = script->next;
286 *p = '\0';
287 linenum++;
288 return (*outbuf);
289 }
290 case '\n':
291 *p++ = '\n';
292 *p = '\0';
293 s++;
294 linenum++;
295 return (*outbuf);
296 default:
297 *p++ = *s++;
298 len--;
299 }
300 }
301 }
302
303 return (NULL);
304 }
305
306 void
finish_file(void)307 finish_file(void)
308 {
309 if (infile != NULL) {
310 fclose(infile);
311 if (*oldfname != '\0') {
312 if (rename(fname, oldfname) != 0) {
313 warn("rename %s to %s", fname, oldfname);
314 unlink(tmpfname);
315 exit(1);
316 }
317 *oldfname = '\0';
318 }
319 if (*tmpfname != '\0') {
320 if (outfile != NULL && outfile != stdout)
321 fclose(outfile);
322 outfile = NULL;
323 if (rename(tmpfname, fname) != 0) {
324 warn("rename %s to %s", tmpfname, fname);
325 unlink(tmpfname);
326 exit(1);
327 }
328 *tmpfname = '\0';
329 }
330 outfname = NULL;
331 }
332 }
333
334 /*
335 * Like getline, but go through the list of files chaining them together.
336 * Set len to the length of the line.
337 */
338 int
mf_getline(SPACE * sp,enum e_spflag spflag)339 mf_getline(SPACE *sp, enum e_spflag spflag)
340 {
341 struct stat sb;
342 size_t len;
343 char dirbuf[PATH_MAX];
344 static char *p;
345 static size_t psize;
346 int c, fd;
347 static int firstfile;
348
349 if (infile == NULL) {
350 /* stdin? */
351 if (files->fname == NULL) {
352 if (inplace != NULL)
353 errx(1, "-i may not be used with stdin");
354 infile = stdin;
355 fname = "stdin";
356 outfile = stdout;
357 outfname = "stdout";
358 }
359
360 firstfile = 1;
361 }
362
363 for (;;) {
364 if (infile != NULL && (c = getc(infile)) != EOF) {
365 (void)ungetc(c, infile);
366 break;
367 }
368 /* If we are here then either eof or no files are open yet */
369 if (infile == stdin) {
370 sp->len = 0;
371 return (0);
372 }
373 finish_file();
374 if (firstfile == 0)
375 files = files->next;
376 else
377 firstfile = 0;
378 if (files == NULL) {
379 sp->len = 0;
380 return (0);
381 }
382 fname = files->fname;
383 if (inplace != NULL) {
384 if (stat(fname, &sb) != 0)
385 err(1, "%s", fname);
386 if (!S_ISREG(sb.st_mode))
387 errx(1, "%s: %s %s", fname,
388 "in-place editing only",
389 "works for regular files");
390 if (*inplace != '\0') {
391 (void)strlcpy(oldfname, fname,
392 sizeof(oldfname));
393 len = strlcat(oldfname, inplace,
394 sizeof(oldfname));
395 if (len >= sizeof(oldfname))
396 errc(1, ENAMETOOLONG, "%s", fname);
397 }
398 len = strlcpy(dirbuf, fname, sizeof(dirbuf));
399 if (len >= sizeof(dirbuf))
400 errc(1, ENAMETOOLONG, "%s", fname);
401 len = snprintf(tmpfname, sizeof(tmpfname),
402 "%s/sedXXXXXXXXXX", dirname(dirbuf));
403 if (len >= sizeof(tmpfname))
404 errc(1, ENAMETOOLONG, "%s", fname);
405 if ((fd = mkstemp(tmpfname)) == -1)
406 err(1, "%s", fname);
407 (void)fchown(fd, sb.st_uid, sb.st_gid);
408 (void)fchmod(fd, sb.st_mode & ALLPERMS);
409 if ((outfile = fdopen(fd, "w")) == NULL) {
410 warn("%s", fname);
411 unlink(tmpfname);
412 exit(1);
413 }
414 outfname = tmpfname;
415 linenum = 0;
416 resetstate();
417 } else {
418 outfile = stdout;
419 outfname = "stdout";
420 }
421 if ((infile = fopen(fname, "r")) == NULL) {
422 warn("%s", fname);
423 rval = 1;
424 continue;
425 }
426 }
427
428 /*
429 * We are here only when infile is open and we still have something
430 * to read from it.
431 *
432 * Use getline() so that we can handle essentially infinite input
433 * data. The p and psize are static so each invocation gives
434 * getline() the same buffer which is expanded as needed.
435 */
436 len = getline(&p, &psize, infile);
437 if ((ssize_t)len == -1)
438 err(1, "%s", fname);
439 if (len != 0 && p[len - 1] == '\n') {
440 sp->append_newline = 1;
441 len--;
442 } else if (!lastline()) {
443 sp->append_newline = 1;
444 } else {
445 sp->append_newline = 0;
446 }
447 cspace(sp, p, len, spflag);
448
449 linenum++;
450
451 return (1);
452 }
453
454 /*
455 * Add a compilation unit to the linked list
456 */
457 static void
add_compunit(enum e_cut type,char * s)458 add_compunit(enum e_cut type, char *s)
459 {
460 struct s_compunit *cu;
461
462 cu = xmalloc(sizeof(struct s_compunit));
463 cu->type = type;
464 cu->s = s;
465 cu->next = NULL;
466 *cu_nextp = cu;
467 cu_nextp = &cu->next;
468 }
469
470 /*
471 * Add a file to the linked list
472 */
473 static void
add_file(char * s)474 add_file(char *s)
475 {
476 struct s_flist *fp;
477
478 fp = xmalloc(sizeof(struct s_flist));
479 fp->next = NULL;
480 *fl_nextp = fp;
481 fp->fname = s;
482 fl_nextp = &fp->next;
483 }
484
485
486 static int
next_files_have_lines(void)487 next_files_have_lines(void)
488 {
489 struct s_flist *file;
490 FILE *file_fd;
491 int ch;
492
493 file = files;
494 while ((file = file->next) != NULL) {
495 if ((file_fd = fopen(file->fname, "r")) == NULL)
496 continue;
497
498 if ((ch = getc(file_fd)) != EOF) {
499 /*
500 * This next file has content, therefore current
501 * file doesn't contains the last line.
502 */
503 ungetc(ch, file_fd);
504 fclose(file_fd);
505 return (1);
506 }
507 fclose(file_fd);
508 }
509 return (0);
510 }
511
512 int
lastline(void)513 lastline(void)
514 {
515 int ch;
516
517 if (feof(infile)) {
518 return !(
519 (inplace == NULL) &&
520 next_files_have_lines());
521 }
522 if ((ch = getc(infile)) == EOF) {
523 return !(
524 (inplace == NULL) &&
525 next_files_have_lines());
526 }
527 ungetc(ch, infile);
528 return (0);
529 }
530