1 /*
2 * Copyright 2020 OmniOS Community Edition (OmniOSce) Association.
3 * Copyright (c) 2013 Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.com>
4 * Copyright (c) 2011 Gary Mills
5 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
6 * Copyright (c) 1992 Diomidis Spinellis.
7 * Copyright (c) 1992, 1993
8 * The Regents of the University of California. All rights reserved.
9 *
10 * This code is derived from software contributed to Berkeley by
11 * Diomidis Spinellis of Imperial College, University of London.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 */
37
38 #include <sys/types.h>
39 #include <sys/mman.h>
40 #include <sys/param.h>
41 #include <sys/stat.h>
42
43 #include <err.h>
44 #include <errno.h>
45 #include <fcntl.h>
46 #include <getopt.h>
47 #include <libgen.h>
48 #include <libintl.h>
49 #include <limits.h>
50 #include <locale.h>
51 #include <regex.h>
52 #include <stddef.h>
53 #include <stdio.h>
54 #include <stdlib.h>
55 #include <string.h>
56 #include <unistd.h>
57
58 #include "defs.h"
59 #include "extern.h"
60
61 /*
62 * Linked list of units (strings and files) to be compiled
63 */
64 struct s_compunit {
65 struct s_compunit *next;
66 enum e_cut {CU_FILE, CU_STRING} type;
67 char *s; /* Pointer to string or fname */
68 };
69
70 /*
71 * Linked list pointer to compilation units and pointer to current
72 * next pointer.
73 */
74 static struct s_compunit *script, **cu_nextp = &script;
75
76 /*
77 * Linked list of files to be processed
78 */
79 struct s_flist {
80 char *fname;
81 struct s_flist *next;
82 };
83
84 /*
85 * Linked list pointer to files and pointer to current
86 * next pointer.
87 */
88 static struct s_flist *files, **fl_nextp = &files;
89
90 FILE *infile; /* Current input file */
91 FILE *outfile; /* Current output file */
92
93 int aflag, eflag, nflag;
94 int rflags = 0;
95 static int rval; /* Exit status */
96
97 static int ispan; /* Whether inplace editing spans across files */
98
99 /*
100 * Current file and line number; line numbers restart across compilation
101 * units, but span across input files. The latter is optional if editing
102 * in place.
103 */
104 const char *fname; /* File name. */
105 const char *outfname; /* Output file name */
106 static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */
107 static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */
108 static const char *inplace; /* Inplace edit file extension. */
109 ulong_t linenum;
110
111 static const struct option lopts[] = {
112 {"in-place", optional_argument, NULL, 'i'},
113 {NULL, 0, NULL, 0}
114 };
115
116 static void add_compunit(enum e_cut, char *);
117 static void add_file(char *);
118 static void usage(void);
119
120
121 int
main(int argc,char * argv[])122 main(int argc, char *argv[])
123 {
124 int c, fflag;
125 char *temp_arg;
126
127 (void) setlocale(LC_ALL, "");
128
129 #ifndef TEXT_DOMAIN
130 #define TEXT_DOMAIN "SYS_TEST"
131 #endif
132 (void) textdomain(TEXT_DOMAIN);
133
134 fflag = 0;
135 inplace = NULL;
136
137 while ((c = getopt_long(argc, argv, "EI::ae:f:i::lnr", lopts, NULL)) !=
138 -1)
139 switch (c) {
140 case 'r': /* Gnu sed compat */
141 case 'E':
142 rflags = REG_EXTENDED;
143 break;
144 case 'I':
145 if (optarg != NULL)
146 inplace = optarg;
147 else
148 inplace = "";
149 ispan = 1; /* span across input files */
150 break;
151 case 'a':
152 aflag = 1;
153 break;
154 case 'e':
155 eflag = 1;
156 if (asprintf(&temp_arg, "%s\n", optarg) < 1)
157 err(1, "asprintf");
158 add_compunit(CU_STRING, temp_arg);
159 break;
160 case 'f':
161 fflag = 1;
162 add_compunit(CU_FILE, optarg);
163 break;
164 case 'i':
165 if (optarg != NULL)
166 inplace = optarg;
167 else
168 inplace = "";
169 ispan = 0; /* don't span across input files */
170 break;
171 case 'l':
172 /* On SunOS, setlinebuf "returns no useful value */
173 (void) setlinebuf(stdout);
174 break;
175 case 'n':
176 nflag = 1;
177 break;
178 default:
179 case '?':
180 usage();
181 }
182 argc -= optind;
183 argv += optind;
184
185 /* First usage case; script is the first arg */
186 if (!eflag && !fflag && *argv) {
187 add_compunit(CU_STRING, *argv);
188 argv++;
189 }
190
191 compile();
192
193 /* Continue with first and start second usage */
194 if (*argv)
195 for (; *argv; argv++)
196 add_file(*argv);
197 else
198 add_file(NULL);
199 process();
200 cfclose(prog, NULL);
201 if (fclose(stdout))
202 err(1, "stdout");
203 return (rval);
204 }
205
206 static void
usage(void)207 usage(void)
208 {
209 (void) fputs(_("usage: sed script [-Ealn] [-i[extension]] [file...]\n"
210 " sed [-Ealn] [-i[extension]] [-e script]... "
211 "[-f script_file]... [file...]\n"),
212 stderr);
213 exit(1);
214 }
215
216 /*
217 * Like fgets, but go through the chain of compilation units chaining them
218 * together. Empty strings and files are ignored.
219 */
220 char *
cu_fgets(char * buf,int n,int * more)221 cu_fgets(char *buf, int n, int *more)
222 {
223 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
224 static FILE *f; /* Current open file */
225 static char *s; /* Current pointer inside string */
226 static char string_ident[30];
227 char *p;
228
229 again:
230 switch (state) {
231 case ST_EOF:
232 if (script == NULL) {
233 if (more != NULL)
234 *more = 0;
235 return (NULL);
236 }
237 linenum = 0;
238 switch (script->type) {
239 case CU_FILE:
240 if ((f = fopen(script->s, "r")) == NULL)
241 err(1, "%s", script->s);
242 fname = script->s;
243 state = ST_FILE;
244 goto again;
245 case CU_STRING:
246 if (((size_t)snprintf(string_ident,
247 sizeof (string_ident), "\"%s\"", script->s)) >=
248 sizeof (string_ident) - 1)
249 (void) strcpy(string_ident +
250 sizeof (string_ident) - 6, " ...\"");
251 fname = string_ident;
252 s = script->s;
253 state = ST_STRING;
254 goto again;
255 default:
256 errx(1, "BUG: Unknown script type: %d\n", script->type);
257 }
258 /*NOTREACHED*/
259
260 case ST_FILE:
261 if ((p = fgets(buf, n, f)) != NULL) {
262 linenum++;
263 if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
264 nflag = 1;
265 if (more != NULL)
266 *more = !feof(f);
267 return (p);
268 }
269 script = script->next;
270 (void) fclose(f);
271 state = ST_EOF;
272 goto again;
273 case ST_STRING:
274 if (linenum == 0 && s[0] == '#' && s[1] == 'n')
275 nflag = 1;
276 p = buf;
277 for (;;) {
278 if (n-- <= 1) {
279 *p = '\0';
280 linenum++;
281 if (more != NULL)
282 *more = 1;
283 return (buf);
284 }
285 switch (*s) {
286 case '\0':
287 state = ST_EOF;
288 if (s == script->s) {
289 script = script->next;
290 goto again;
291 } else {
292 script = script->next;
293 *p = '\0';
294 linenum++;
295 if (more != NULL)
296 *more = 0;
297 return (buf);
298 }
299 case '\n':
300 *p++ = '\n';
301 *p = '\0';
302 s++;
303 linenum++;
304 if (more != NULL)
305 *more = 0;
306 return (buf);
307 default:
308 *p++ = *s++;
309 }
310 }
311 }
312 /* NOTREACHED */
313 return (NULL);
314 }
315
316 /*
317 * Like fgets, but go through the list of files chaining them together.
318 * Set len to the length of the line.
319 */
320 int
mf_fgets(SPACE * sp,enum e_spflag spflag)321 mf_fgets(SPACE *sp, enum e_spflag spflag)
322 {
323 struct stat sb, nsb;
324 ssize_t len;
325 static char *p = NULL;
326 static size_t plen = 0;
327 int c;
328 static int firstfile;
329
330 if (infile == NULL) {
331 /* stdin? */
332 if (files->fname == NULL) {
333 if (inplace != NULL)
334 errx(1,
335 _("-I or -i may not be used with stdin"));
336 infile = stdin;
337 fname = "stdin";
338 outfile = stdout;
339 outfname = "stdout";
340 }
341 firstfile = 1;
342 }
343
344 for (;;) {
345 if (infile != NULL && (c = getc(infile)) != EOF) {
346 (void) ungetc(c, infile);
347 break;
348 }
349 /* If we are here then either eof or no files are open yet */
350 if (infile == stdin) {
351 sp->len = 0;
352 return (0);
353 }
354 if (infile != NULL) {
355 (void) fclose(infile);
356 if (*oldfname != '\0') {
357 /* if there was a backup file, remove it */
358 (void) unlink(oldfname);
359 /*
360 * Backup the original. Note that hard links
361 * are not supported on all filesystems.
362 */
363 if ((link(fname, oldfname) != 0) &&
364 (rename(fname, oldfname) != 0)) {
365 warn("rename()");
366 if (*tmpfname)
367 (void) unlink(tmpfname);
368 exit(1);
369 }
370 *oldfname = '\0';
371 }
372 if (*tmpfname != '\0') {
373 if (outfile != NULL && outfile != stdout)
374 if (fclose(outfile) != 0) {
375 warn("fclose()");
376 (void) unlink(tmpfname);
377 exit(1);
378 }
379 outfile = NULL;
380 if (rename(tmpfname, fname) != 0) {
381 /* this should not happen really! */
382 warn("rename()");
383 (void) unlink(tmpfname);
384 exit(1);
385 }
386 *tmpfname = '\0';
387 }
388 outfname = NULL;
389 }
390 if (firstfile == 0)
391 files = files->next;
392 else
393 firstfile = 0;
394 if (files == NULL) {
395 sp->len = 0;
396 return (0);
397 }
398 fname = files->fname;
399 if (inplace != NULL) {
400 char bn[PATH_MAX];
401 char dn[PATH_MAX];
402 (void) strlcpy(bn, fname, sizeof (bn));
403 (void) strlcpy(dn, fname, sizeof (dn));
404 if (lstat(fname, &sb) != 0)
405 err(1, "%s", fname);
406 if (!(sb.st_mode & S_IFREG))
407 fatal(_("in-place editing only "
408 "works for regular files"));
409 if (*inplace != '\0') {
410 (void) strlcpy(oldfname, fname,
411 sizeof (oldfname));
412 len = strlcat(oldfname, inplace,
413 sizeof (oldfname));
414 if (len > sizeof (oldfname))
415 fatal(_("name too long"));
416 }
417 len = snprintf(tmpfname, sizeof (tmpfname),
418 "%s/.!%ld!%s", dirname(dn), (long)getpid(),
419 basename(bn));
420 if (len >= sizeof (tmpfname))
421 fatal(_("name too long"));
422 (void) unlink(tmpfname);
423 if ((outfile = fopen(tmpfname, "w")) == NULL)
424 err(1, "%s", fname);
425 /*
426 * Some file systems don't support chown or
427 * chmod fully. On those, the owner/group and
428 * permissions will already be set to what
429 * they need to be.
430 */
431 if (fstat(fileno(outfile), &nsb) != 0) {
432 warn("fstat()");
433 }
434 if (((sb.st_uid != nsb.st_uid) ||
435 (sb.st_gid != nsb.st_gid)) &&
436 (fchown(fileno(outfile), sb.st_uid, sb.st_gid)
437 != 0))
438 warn("fchown()");
439 if ((sb.st_mode != nsb.st_mode) &&
440 (fchmod(fileno(outfile), sb.st_mode & 07777) != 0))
441 warn("fchmod()");
442 outfname = tmpfname;
443 if (!ispan) {
444 linenum = 0;
445 resetstate();
446 }
447 } else {
448 outfile = stdout;
449 outfname = "stdout";
450 }
451 if ((infile = fopen(fname, "r")) == NULL) {
452 warn("%s", fname);
453 rval = 1;
454 continue;
455 }
456 }
457 /*
458 * We are here only when infile is open and we still have something
459 * to read from it.
460 *
461 * Use getline() so that we can handle essentially infinite
462 * input data. The p and plen are static so each invocation gives
463 * getline() the same buffer which is expanded as needed.
464 */
465 len = getline(&p, &plen, infile);
466 if (len == -1)
467 err(1, "%s", fname);
468 if (len != 0 && p[len - 1] == '\n')
469 len--;
470 cspace(sp, p, len, spflag);
471
472 linenum++;
473
474 return (1);
475 }
476
477 /*
478 * Add a compilation unit to the linked list
479 */
480 static void
add_compunit(enum e_cut type,char * s)481 add_compunit(enum e_cut type, char *s)
482 {
483 struct s_compunit *cu;
484
485 if ((cu = malloc(sizeof (struct s_compunit))) == NULL)
486 err(1, "malloc");
487 cu->type = type;
488 cu->s = s;
489 cu->next = NULL;
490 *cu_nextp = cu;
491 cu_nextp = &cu->next;
492 }
493
494 /*
495 * Add a file to the linked list
496 */
497 static void
add_file(char * s)498 add_file(char *s)
499 {
500 struct s_flist *fp;
501
502 if ((fp = malloc(sizeof (struct s_flist))) == NULL)
503 err(1, "malloc");
504 fp->next = NULL;
505 *fl_nextp = fp;
506 fp->fname = s;
507 fl_nextp = &fp->next;
508 }
509
510 int
lastline(void)511 lastline(void)
512 {
513 int ch;
514
515 if (feof(infile) != 0 || (ch = getc(infile)) == EOF) {
516 struct s_flist *f;
517
518 /*
519 * Reached the end of the current input file.
520 * If there are no more that contain data, then this is the
521 * last line.
522 */
523 if (inplace != NULL && ispan == 0)
524 return (1);
525
526 for (f = files->next; f != NULL; f = f->next) {
527 struct stat st;
528
529 if (stat(f->fname, &st) == -1) {
530 /* Treat an error here as an empty file */
531 continue;
532 }
533 if (st.st_size > 0)
534 return (0);
535 }
536 return (1);
537 }
538
539 (void) ungetc(ch, infile);
540 return (0);
541 }
542