1 /* $NetBSD: main.c,v 1.38 2021/03/11 15:45:55 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2013 Johann 'Myrkraverk' Oskarsson.
5 * Copyright (c) 1992 Diomidis Spinellis.
6 * Copyright (c) 1992, 1993
7 * The Regents of the University of California. All rights reserved.
8 *
9 * This code is derived from software contributed to Berkeley by
10 * Diomidis Spinellis of Imperial College, University of London.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37 #if HAVE_NBTOOL_CONFIG_H
38 #include "nbtool_config.h"
39 #endif
40
41 #include <sys/cdefs.h>
42 __RCSID("$NetBSD: main.c,v 1.38 2021/03/11 15:45:55 christos Exp $");
43 #ifdef __FBSDID
44 __FBSDID("$FreeBSD: head/usr.bin/sed/main.c 252231 2013-06-26 04:14:19Z pfg $");
45 #endif
46
47 #ifndef lint
48 __COPYRIGHT("@(#) Copyright (c) 1992, 1993\
49 The Regents of the University of California. All rights reserved.");
50 #endif
51
52 #if 0
53 static const char sccsid[] = "@(#)main.c 8.2 (Berkeley) 1/3/94";
54 #endif
55
56 #include <sys/types.h>
57 #include <sys/mman.h>
58 #include <sys/param.h>
59 #include <sys/stat.h>
60
61 #include <err.h>
62 #include <errno.h>
63 #include <fcntl.h>
64 #include <libgen.h>
65 #include <limits.h>
66 #include <locale.h>
67 #include <regex.h>
68 #include <stddef.h>
69 #define _WITH_GETLINE
70 #include <stdio.h>
71 #include <stdlib.h>
72 #include <string.h>
73 #include <unistd.h>
74
75 #include "defs.h"
76 #include "extern.h"
77
78 /*
79 * Linked list of units (strings and files) to be compiled
80 */
81 struct s_compunit {
82 struct s_compunit *next;
83 enum e_cut {CU_FILE, CU_STRING} type;
84 char *s; /* Pointer to string or fname */
85 };
86
87 /*
88 * Linked list pointer to compilation units and pointer to current
89 * next pointer.
90 */
91 static struct s_compunit *script, **cu_nextp = &script;
92
93 /*
94 * Linked list of files to be processed
95 */
96 struct s_flist {
97 char *fname;
98 struct s_flist *next;
99 };
100
101 /*
102 * Linked list pointer to files and pointer to current
103 * next pointer.
104 */
105 static struct s_flist *files, **fl_nextp = &files;
106
107 FILE *infile; /* Current input file */
108 FILE *outfile; /* Current output file */
109
110 int aflag, eflag, nflag;
111 int rflags = 0;
112 static int rval; /* Exit status */
113
114 static int ispan; /* Whether inplace editing spans across files */
115
116 /*
117 * Current file and line number; line numbers restart across compilation
118 * units, but span across input files. The latter is optional if editing
119 * in place.
120 */
121 const char *fname; /* File name. */
122 const char *outfname; /* Output file name */
123 static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */
124 static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */
125 static const char *inplace; /* Inplace edit file extension. */
126 u_long linenum;
127
128 static void add_compunit(enum e_cut, char *);
129 static void add_file(char *);
130 static void usage(void) __dead;
131
132 int
main(int argc,char * argv[])133 main(int argc, char *argv[])
134 {
135 int c, fflag;
136 char *temp_arg;
137
138 setprogname(argv[0]);
139 (void) setlocale(LC_ALL, "");
140
141 fflag = 0;
142 inplace = NULL;
143
144 while ((c = getopt(argc, argv, "EGI::ae:f:gi::lnru")) != -1)
145 switch (c) {
146 case 'r': /* Gnu sed compat */
147 case 'E':
148 rflags |= REG_EXTENDED;
149 break;
150 case 'G':
151 rflags &= ~REG_GNU;
152 break;
153 case 'I':
154 inplace = optarg ? optarg : __UNCONST("");
155 ispan = 1; /* span across input files */
156 break;
157 case 'a':
158 aflag = 1;
159 break;
160 case 'e':
161 eflag = 1;
162 temp_arg = xmalloc(strlen(optarg) + 2);
163 strcpy(temp_arg, optarg);
164 strcat(temp_arg, "\n");
165 add_compunit(CU_STRING, temp_arg);
166 break;
167 case 'f':
168 fflag = 1;
169 add_compunit(CU_FILE, optarg);
170 break;
171 case 'g':
172 rflags |= REG_GNU;
173 break;
174 case 'i':
175 inplace = optarg ? optarg : __UNCONST("");
176 ispan = 0; /* don't span across input files */
177 break;
178 case 'l':
179 #ifdef _IOLBF
180 c = setvbuf(stdout, NULL, _IOLBF, 0);
181 #else
182 c = setlinebuf(stdout);
183 #endif
184 if (c)
185 warn("setting line buffered output failed");
186 break;
187 case 'n':
188 nflag = 1;
189 break;
190 case 'u':
191 #ifdef _IONBF
192 c = setvbuf(stdout, NULL, _IONBF, 0);
193 #else
194 c = -1;
195 errno = EOPNOTSUPP;
196 #endif
197 if (c)
198 warn("setting unbuffered output failed");
199 break;
200 default:
201 case '?':
202 usage();
203 }
204 argc -= optind;
205 argv += optind;
206
207 /* First usage case; script is the first arg */
208 if (!eflag && !fflag && *argv) {
209 add_compunit(CU_STRING, *argv);
210 argv++;
211 }
212
213 compile();
214
215 /* Continue with first and start second usage */
216 if (*argv)
217 for (; *argv; argv++)
218 add_file(*argv);
219 else
220 add_file(NULL);
221 process();
222 cfclose(prog, NULL);
223 if (fclose(stdout))
224 err(1, "stdout");
225 exit(rval);
226 }
227
228 static void
usage(void)229 usage(void)
230 {
231 (void)fprintf(stderr,
232 "Usage: %s [-aEGglnru] command [file ...]\n"
233 "\t%s [-aEGglnru] [-e command] [-f command_file] [-I[extension]]\n"
234 "\t [-i[extension]] [file ...]\n", getprogname(), getprogname());
235 exit(1);
236 }
237
238 /*
239 * Like fgets, but go through the chain of compilation units chaining them
240 * together. Empty strings and files are ignored.
241 */
242 char *
cu_fgets(char * buf,int n,int * more)243 cu_fgets(char *buf, int n, int *more)
244 {
245 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
246 static FILE *f; /* Current open file */
247 static char *s; /* Current pointer inside string */
248 static char string_ident[30];
249 char *p;
250
251 again:
252 switch (state) {
253 case ST_EOF:
254 if (script == NULL) {
255 if (more != NULL)
256 *more = 0;
257 return (NULL);
258 }
259 linenum = 0;
260 switch (script->type) {
261 case CU_FILE:
262 if ((f = fopen(script->s, "r")) == NULL)
263 err(1, "%s", script->s);
264 fname = script->s;
265 state = ST_FILE;
266 goto again;
267 case CU_STRING:
268 if (((size_t)snprintf(string_ident,
269 sizeof(string_ident), "\"%s\"", script->s)) >=
270 sizeof(string_ident) - 1)
271 (void)strcpy(string_ident +
272 sizeof(string_ident) - 6, " ...\"");
273 fname = string_ident;
274 s = script->s;
275 state = ST_STRING;
276 goto again;
277 default:
278 abort();
279 }
280 case ST_FILE:
281 if ((p = fgets(buf, n, f)) != NULL) {
282 linenum++;
283 if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
284 nflag = 1;
285 if (more != NULL)
286 *more = !feof(f);
287 return (p);
288 }
289 script = script->next;
290 (void)fclose(f);
291 state = ST_EOF;
292 goto again;
293 case ST_STRING:
294 if (linenum == 0 && s[0] == '#' && s[1] == 'n')
295 nflag = 1;
296 p = buf;
297 for (;;) {
298 if (n-- <= 1) {
299 *p = '\0';
300 linenum++;
301 if (more != NULL)
302 *more = 1;
303 return (buf);
304 }
305 switch (*s) {
306 case '\0':
307 state = ST_EOF;
308 if (s == script->s) {
309 script = script->next;
310 goto again;
311 } else {
312 script = script->next;
313 *p = '\0';
314 linenum++;
315 if (more != NULL)
316 *more = 0;
317 return (buf);
318 }
319 case '\n':
320 *p++ = '\n';
321 *p = '\0';
322 s++;
323 linenum++;
324 if (more != NULL)
325 *more = 0;
326 return (buf);
327 default:
328 *p++ = *s++;
329 }
330 }
331 }
332 /* NOTREACHED */
333 return (NULL);
334 }
335
336 /*
337 * Like fgets, but go through the list of files chaining them together.
338 * Set len to the length of the line.
339 */
340 int
mf_fgets(SPACE * sp,enum e_spflag spflag)341 mf_fgets(SPACE *sp, enum e_spflag spflag)
342 {
343 struct stat sb;
344 size_t len;
345 static char *p = NULL;
346 static size_t plen = 0;
347 int c;
348 static int firstfile;
349
350 if (infile == NULL) {
351 /* stdin? */
352 if (files->fname == NULL) {
353 if (inplace != NULL)
354 errx(1, "-I or -i may not be used with stdin");
355 infile = stdin;
356 fname = "stdin";
357 outfile = stdout;
358 outfname = "stdout";
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 if (infile != NULL) {
374 fclose(infile);
375 if (*oldfname != '\0') {
376 /* if there was a backup file, remove it */
377 unlink(oldfname);
378 /*
379 * Backup the original. Note that hard links
380 * are not supported on all filesystems.
381 */
382 if ((link(fname, oldfname) != 0) &&
383 (rename(fname, oldfname) != 0)) {
384 warn("rename()");
385 if (*tmpfname)
386 unlink(tmpfname);
387 exit(1);
388 }
389 *oldfname = '\0';
390 }
391 if (*tmpfname != '\0') {
392 if (outfile != NULL && outfile != stdout)
393 if (fclose(outfile) != 0) {
394 warn("fclose()");
395 unlink(tmpfname);
396 exit(1);
397 }
398 outfile = NULL;
399 if (rename(tmpfname, fname) != 0) {
400 /* this should not happen really! */
401 warn("rename()");
402 unlink(tmpfname);
403 exit(1);
404 }
405 *tmpfname = '\0';
406 }
407 outfname = NULL;
408 }
409 if (firstfile == 0)
410 files = files->next;
411 else
412 firstfile = 0;
413 if (files == NULL) {
414 sp->len = 0;
415 return (0);
416 }
417 fname = files->fname;
418 if (inplace != NULL) {
419 if (lstat(fname, &sb) != 0)
420 err(1, "%s", fname);
421 if (!(sb.st_mode & S_IFREG))
422 errx(1, "%s: %s %s", fname,
423 "in-place editing only",
424 "works for regular files");
425 if (*inplace != '\0') {
426 strlcpy(oldfname, fname,
427 sizeof(oldfname));
428 len = strlcat(oldfname, inplace,
429 sizeof(oldfname));
430 if (len > sizeof(oldfname))
431 errx(1, "%s: name too long", fname);
432 }
433 char d_name[PATH_MAX], f_name[PATH_MAX];
434 (void)strlcpy(d_name, fname, sizeof(d_name));
435 (void)strlcpy(f_name, fname, sizeof(f_name));
436 len = (size_t)snprintf(tmpfname, sizeof(tmpfname),
437 "%s/.!%ld!%s", dirname(d_name), (long)getpid(),
438 basename(f_name));
439 if (len >= sizeof(tmpfname))
440 errx(1, "%s: name too long", fname);
441 unlink(tmpfname);
442 if (outfile != NULL && outfile != stdout)
443 fclose(outfile);
444 if ((outfile = fopen(tmpfname, "w")) == NULL)
445 err(1, "%s", fname);
446 fchown(fileno(outfile), sb.st_uid, sb.st_gid);
447 fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
448 outfname = tmpfname;
449 if (!ispan) {
450 linenum = 0;
451 resetstate();
452 }
453 } else {
454 outfile = stdout;
455 outfname = "stdout";
456 }
457 if ((infile = fopen(fname, "r")) == NULL) {
458 warn("%s", fname);
459 rval = 1;
460 continue;
461 }
462 }
463 /*
464 * We are here only when infile is open and we still have something
465 * to read from it.
466 *
467 * Use getline() so that we can handle essentially infinite input
468 * data. The p and plen are static so each invocation gives
469 * getline() the same buffer which is expanded as needed.
470 */
471 ssize_t slen = getline(&p, &plen, infile);
472 if (slen == -1)
473 err(1, "%s", fname);
474 if (slen != 0 && p[slen - 1] == '\n') {
475 sp->append_newline = 1;
476 slen--;
477 } else if (!lastline()) {
478 sp->append_newline = 1;
479 } else {
480 sp->append_newline = 0;
481 }
482 cspace(sp, p, (size_t)slen, spflag);
483
484 linenum++;
485
486 return (1);
487 }
488
489 /*
490 * Add a compilation unit to the linked list
491 */
492 static void
add_compunit(enum e_cut type,char * s)493 add_compunit(enum e_cut type, char *s)
494 {
495 struct s_compunit *cu;
496
497 cu = xmalloc(sizeof(struct s_compunit));
498 cu->type = type;
499 cu->s = s;
500 cu->next = NULL;
501 *cu_nextp = cu;
502 cu_nextp = &cu->next;
503 }
504
505 /*
506 * Add a file to the linked list
507 */
508 static void
add_file(char * s)509 add_file(char *s)
510 {
511 struct s_flist *fp;
512
513 fp = xmalloc(sizeof(struct s_flist));
514 fp->next = NULL;
515 *fl_nextp = fp;
516 fp->fname = s;
517 fl_nextp = &fp->next;
518 }
519
520 static int
next_files_have_lines(void)521 next_files_have_lines(void)
522 {
523 struct s_flist *file;
524 FILE *file_fd;
525 int ch;
526
527 file = files;
528 while ((file = file->next) != NULL) {
529 if ((file_fd = fopen(file->fname, "r")) == NULL)
530 continue;
531
532 if ((ch = getc(file_fd)) != EOF) {
533 /*
534 * This next file has content, therefore current
535 * file doesn't contains the last line.
536 */
537 ungetc(ch, file_fd);
538 fclose(file_fd);
539 return (1);
540 }
541
542 fclose(file_fd);
543 }
544
545 return (0);
546 }
547
548 int
lastline(void)549 lastline(void)
550 {
551 int ch;
552
553 if (feof(infile)) {
554 return !(
555 (inplace == NULL || ispan) &&
556 next_files_have_lines());
557 }
558 if ((ch = getc(infile)) == EOF) {
559 return !(
560 (inplace == NULL || ispan) &&
561 next_files_have_lines());
562 }
563 ungetc(ch, infile);
564 return (0);
565 }
566