1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
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 #include <sys/cdefs.h>
38 #ifndef lint
39 static const char copyright[] =
40 "@(#) Copyright (c) 1992, 1993\n\
41 The Regents of the University of California. All rights reserved.\n";
42 #endif
43
44 #ifndef lint
45 static const char sccsid[] = "@(#)main.c 8.2 (Berkeley) 1/3/94";
46 #endif
47
48 #include <sys/types.h>
49 #include <sys/mman.h>
50 #include <sys/param.h>
51 #include <sys/stat.h>
52
53 #include <err.h>
54 #include <errno.h>
55 #include <fcntl.h>
56 #include <libgen.h>
57 #include <limits.h>
58 #include <locale.h>
59 #include <regex.h>
60 #include <stddef.h>
61 #include <stdio.h>
62 #include <stdlib.h>
63 #include <string.h>
64 #include <unistd.h>
65
66 #include "defs.h"
67 #include "extern.h"
68
69 /*
70 * Linked list of units (strings and files) to be compiled
71 */
72 struct s_compunit {
73 struct s_compunit *next;
74 enum e_cut {CU_FILE, CU_STRING} type;
75 char *s; /* Pointer to string or fname */
76 };
77
78 /*
79 * Linked list pointer to compilation units and pointer to current
80 * next pointer.
81 */
82 static struct s_compunit *script, **cu_nextp = &script;
83
84 /*
85 * Linked list of files to be processed
86 */
87 struct s_flist {
88 char *fname;
89 struct s_flist *next;
90 };
91
92 /*
93 * Linked list pointer to files and pointer to current
94 * next pointer.
95 */
96 static struct s_flist *files, **fl_nextp = &files;
97
98 FILE *infile; /* Current input file */
99 FILE *outfile; /* Current output file */
100
101 int aflag, eflag, nflag;
102 int rflags = 0;
103 int quit = 0;
104 static int rval; /* Exit status */
105
106 static int ispan; /* Whether inplace editing spans across files */
107
108 /*
109 * Current file and line number; line numbers restart across compilation
110 * units, but span across input files. The latter is optional if editing
111 * in place.
112 */
113 const char *fname; /* File name. */
114 const char *outfname; /* Output file name */
115 static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */
116 static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */
117 const char *inplace; /* Inplace edit file extension. */
118 u_long linenum;
119
120 static void add_compunit(enum e_cut, char *);
121 static void add_file(char *);
122 static void usage(void) __dead2;
123
124 int
main(int argc,char * argv[])125 main(int argc, char *argv[])
126 {
127 int c, fflag, fflagstdin;
128 char *temp_arg;
129
130 (void) setlocale(LC_ALL, "");
131
132 fflag = 0;
133 fflagstdin = 0;
134 inplace = NULL;
135
136 while ((c = getopt(argc, argv, "EI:ae:f:i:lnru")) != -1)
137 switch (c) {
138 case 'r': /* Gnu sed compat */
139 case 'E':
140 rflags = REG_EXTENDED;
141 break;
142 case 'I':
143 inplace = optarg;
144 ispan = 1; /* span across input files */
145 break;
146 case 'a':
147 aflag = 1;
148 break;
149 case 'e':
150 eflag = 1;
151 if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL)
152 err(1, "malloc");
153 strcpy(temp_arg, optarg);
154 strcat(temp_arg, "\n");
155 add_compunit(CU_STRING, temp_arg);
156 break;
157 case 'f':
158 fflag = 1;
159 if (strcmp(optarg, "-") == 0)
160 fflagstdin = 1;
161 add_compunit(CU_FILE, optarg);
162 break;
163 case 'i':
164 inplace = optarg;
165 ispan = 0; /* don't span across input files */
166 break;
167 case 'l':
168 if(setvbuf(stdout, NULL, _IOLBF, 0) != 0)
169 warnx("setting line buffered output failed");
170 break;
171 case 'n':
172 nflag = 1;
173 break;
174 case 'u':
175 if(setvbuf(stdout, NULL, _IONBF, 0) != 0)
176 warnx("setting unbuffered output failed");
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 if (fflagstdin)
198 exit(rval);
199 else
200 add_file(NULL);
201 process();
202 cfclose(prog, NULL);
203 if (fclose(stdout))
204 err(1, "stdout");
205 exit(rval);
206 }
207
208 static void
usage(void)209 usage(void)
210 {
211 (void)fprintf(stderr,
212 "usage: %s script [-Ealnru] [-i extension] [file ...]\n"
213 "\t%s [-Ealnu] [-i extension] [-e script] ... [-f script_file]"
214 " ... [file ...]\n", getprogname(), getprogname());
215 exit(1);
216 }
217
218 /*
219 * Like fgets, but go through the chain of compilation units chaining them
220 * together. Empty strings and files are ignored.
221 */
222 char *
cu_fgets(char * buf,int n,int * more)223 cu_fgets(char *buf, int n, int *more)
224 {
225 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
226 static FILE *f; /* Current open file */
227 static char *s; /* Current pointer inside string */
228 static char string_ident[30];
229 char *p;
230
231 again:
232 switch (state) {
233 case ST_EOF:
234 if (script == NULL) {
235 if (more != NULL)
236 *more = 0;
237 return (NULL);
238 }
239 linenum = 0;
240 switch (script->type) {
241 case CU_FILE:
242 if (strcmp(script->s, "-") == 0) {
243 f = stdin;
244 fname = "stdin";
245 } else {
246 if ((f = fopen(script->s, "r")) == NULL)
247 err(1, "%s", script->s);
248 fname = script->s;
249 }
250 state = ST_FILE;
251 goto again;
252 case CU_STRING:
253 if (((size_t)snprintf(string_ident,
254 sizeof(string_ident), "\"%s\"", script->s)) >=
255 sizeof(string_ident) - 1)
256 (void)strcpy(string_ident +
257 sizeof(string_ident) - 6, " ...\"");
258 fname = string_ident;
259 s = script->s;
260 state = ST_STRING;
261 goto again;
262 default:
263 __unreachable();
264 }
265 case ST_FILE:
266 if ((p = fgets(buf, n, f)) != NULL) {
267 linenum++;
268 if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
269 nflag = 1;
270 if (more != NULL)
271 *more = !feof(f);
272 return (p);
273 }
274 script = script->next;
275 (void)fclose(f);
276 state = ST_EOF;
277 goto again;
278 case ST_STRING:
279 if (linenum == 0 && s[0] == '#' && s[1] == 'n')
280 nflag = 1;
281 p = buf;
282 for (;;) {
283 if (n-- <= 1) {
284 *p = '\0';
285 linenum++;
286 if (more != NULL)
287 *more = 1;
288 return (buf);
289 }
290 switch (*s) {
291 case '\0':
292 state = ST_EOF;
293 if (s == script->s) {
294 script = script->next;
295 goto again;
296 } else {
297 script = script->next;
298 *p = '\0';
299 linenum++;
300 if (more != NULL)
301 *more = 0;
302 return (buf);
303 }
304 case '\n':
305 *p++ = '\n';
306 *p = '\0';
307 s++;
308 linenum++;
309 if (more != NULL)
310 *more = 0;
311 return (buf);
312 default:
313 *p++ = *s++;
314 }
315 }
316 }
317 /* NOTREACHED */
318 return (NULL);
319 }
320
321 /*
322 * Like fgets, but go through the list of files chaining them together.
323 * Set len to the length of the line.
324 */
325 int
mf_fgets(SPACE * sp,enum e_spflag spflag)326 mf_fgets(SPACE *sp, enum e_spflag spflag)
327 {
328 struct stat sb;
329 ssize_t len;
330 char *dirbuf, *basebuf;
331 static char *p = NULL;
332 static size_t plen = 0;
333 int c;
334 static int firstfile;
335
336 if (infile == NULL) {
337 /* stdin? */
338 if (files->fname == NULL) {
339 if (inplace != NULL)
340 errx(1, "-I or -i may not be used with stdin");
341 infile = stdin;
342 fname = "stdin";
343 outfile = stdout;
344 outfname = "stdout";
345 }
346 firstfile = 1;
347 }
348
349 for (;;) {
350 if (infile != NULL && (c = getc(infile)) != EOF && !quit) {
351 (void)ungetc(c, infile);
352 break;
353 }
354 /* If we are here then either eof or no files are open yet */
355 if (infile == stdin) {
356 sp->len = 0;
357 return (0);
358 }
359 if (infile != NULL) {
360 fclose(infile);
361 if (*oldfname != '\0') {
362 /* if there was a backup file, remove it */
363 unlink(oldfname);
364 /*
365 * Backup the original. Note that hard links
366 * are not supported on all filesystems.
367 */
368 if ((link(fname, oldfname) != 0) &&
369 (rename(fname, oldfname) != 0)) {
370 warn("rename()");
371 if (*tmpfname)
372 unlink(tmpfname);
373 exit(1);
374 }
375 *oldfname = '\0';
376 }
377 if (*tmpfname != '\0') {
378 if (outfile != NULL && outfile != stdout)
379 if (fclose(outfile) != 0) {
380 warn("fclose()");
381 unlink(tmpfname);
382 exit(1);
383 }
384 outfile = NULL;
385 if (rename(tmpfname, fname) != 0) {
386 /* this should not happen really! */
387 warn("rename()");
388 unlink(tmpfname);
389 exit(1);
390 }
391 *tmpfname = '\0';
392 }
393 outfname = NULL;
394 }
395 if (firstfile == 0)
396 files = files->next;
397 else
398 firstfile = 0;
399 if (files == NULL) {
400 sp->len = 0;
401 return (0);
402 }
403 fname = files->fname;
404 if (inplace != NULL) {
405 if (lstat(fname, &sb) != 0)
406 err(1, "%s", fname);
407 if (!S_ISREG(sb.st_mode))
408 errx(1, "%s: %s %s", fname,
409 "in-place editing only",
410 "works for regular files");
411 if (*inplace != '\0') {
412 strlcpy(oldfname, fname,
413 sizeof(oldfname));
414 len = strlcat(oldfname, inplace,
415 sizeof(oldfname));
416 if (len > (ssize_t)sizeof(oldfname))
417 errx(1, "%s: name too long", fname);
418 }
419 if ((dirbuf = strdup(fname)) == NULL ||
420 (basebuf = strdup(fname)) == NULL)
421 err(1, "strdup");
422 len = snprintf(tmpfname, sizeof(tmpfname),
423 "%s/.!%ld!%s", dirname(dirbuf), (long)getpid(),
424 basename(basebuf));
425 free(dirbuf);
426 free(basebuf);
427 if (len >= (ssize_t)sizeof(tmpfname))
428 errx(1, "%s: name too long", fname);
429 unlink(tmpfname);
430 if (outfile != NULL && outfile != stdout)
431 fclose(outfile);
432 if ((outfile = fopen(tmpfname, "w")) == NULL)
433 err(1, "%s", fname);
434 fchown(fileno(outfile), sb.st_uid, sb.st_gid);
435 fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
436 outfname = tmpfname;
437 if (!ispan) {
438 linenum = 0;
439 resetstate();
440 }
441 } else {
442 outfile = stdout;
443 outfname = "stdout";
444 }
445 if ((infile = fopen(fname, "r")) == NULL) {
446 warn("%s", fname);
447 rval = 1;
448 continue;
449 }
450 }
451 /*
452 * We are here only when infile is open and we still have something
453 * to read from it.
454 *
455 * Use getline() so that we can handle essentially infinite input
456 * data. The p and plen are static so each invocation gives
457 * getline() the same buffer which is expanded as needed.
458 */
459 len = getline(&p, &plen, infile);
460 if (len == -1)
461 err(1, "%s", fname);
462 if (len != 0 && p[len - 1] == '\n') {
463 sp->append_newline = 1;
464 len--;
465 } else if (!lastline()) {
466 sp->append_newline = 1;
467 } else {
468 sp->append_newline = 0;
469 }
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 static int
next_files_have_lines(void)511 next_files_have_lines(void)
512 {
513 struct s_flist *file;
514 FILE *file_fd;
515 int ch;
516
517 file = files;
518 while ((file = file->next) != NULL) {
519 if ((file_fd = fopen(file->fname, "r")) == NULL)
520 continue;
521
522 if ((ch = getc(file_fd)) != EOF) {
523 /*
524 * This next file has content, therefore current
525 * file doesn't contains the last line.
526 */
527 ungetc(ch, file_fd);
528 fclose(file_fd);
529 return (1);
530 }
531
532 fclose(file_fd);
533 }
534
535 return (0);
536 }
537
538 int
lastline(void)539 lastline(void)
540 {
541 int ch;
542
543 if (feof(infile)) {
544 return !(
545 (inplace == NULL || ispan) &&
546 next_files_have_lines());
547 }
548 if ((ch = getc(infile)) == EOF) {
549 return !(
550 (inplace == NULL || ispan) &&
551 next_files_have_lines());
552 }
553 ungetc(ch, infile);
554 return (0);
555 }
556