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 __FBSDID("$FreeBSD$");
39
40 #ifndef lint
41 static const char copyright[] =
42 "@(#) Copyright (c) 1992, 1993\n\
43 The Regents of the University of California. All rights reserved.\n";
44 #endif
45
46 #ifndef lint
47 static const char sccsid[] = "@(#)main.c 8.2 (Berkeley) 1/3/94";
48 #endif
49
50 #include <sys/types.h>
51 #include <sys/mman.h>
52 #include <sys/param.h>
53 #include <sys/stat.h>
54
55 #include <err.h>
56 #include <errno.h>
57 #include <fcntl.h>
58 #include <libgen.h>
59 #include <limits.h>
60 #include <locale.h>
61 #include <regex.h>
62 #include <stddef.h>
63 #include <stdio.h>
64 #include <stdlib.h>
65 #include <string.h>
66 #include <unistd.h>
67
68 #include "defs.h"
69 #include "extern.h"
70
71 /*
72 * Linked list of units (strings and files) to be compiled
73 */
74 struct s_compunit {
75 struct s_compunit *next;
76 enum e_cut {CU_FILE, CU_STRING} type;
77 char *s; /* Pointer to string or fname */
78 };
79
80 /*
81 * Linked list pointer to compilation units and pointer to current
82 * next pointer.
83 */
84 static struct s_compunit *script, **cu_nextp = &script;
85
86 /*
87 * Linked list of files to be processed
88 */
89 struct s_flist {
90 char *fname;
91 struct s_flist *next;
92 };
93
94 /*
95 * Linked list pointer to files and pointer to current
96 * next pointer.
97 */
98 static struct s_flist *files, **fl_nextp = &files;
99
100 FILE *infile; /* Current input file */
101 FILE *outfile; /* Current output file */
102
103 int aflag, eflag, nflag;
104 int rflags = 0;
105 int quit = 0;
106 static int rval; /* Exit status */
107
108 static int ispan; /* Whether inplace editing spans across files */
109
110 /*
111 * Current file and line number; line numbers restart across compilation
112 * units, but span across input files. The latter is optional if editing
113 * in place.
114 */
115 const char *fname; /* File name. */
116 const char *outfname; /* Output file name */
117 static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */
118 static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */
119 const char *inplace; /* Inplace edit file extension. */
120 u_long linenum;
121
122 static void add_compunit(enum e_cut, char *);
123 static void add_file(char *);
124 static void usage(void);
125
126 int
main(int argc,char * argv[])127 main(int argc, char *argv[])
128 {
129 int c, fflag, fflagstdin;
130 char *temp_arg;
131
132 (void) setlocale(LC_ALL, "");
133
134 fflag = 0;
135 fflagstdin = 0;
136 inplace = NULL;
137
138 while ((c = getopt(argc, argv, "EI:ae:f:i:lnru")) != -1)
139 switch (c) {
140 case 'r': /* Gnu sed compat */
141 case 'E':
142 rflags = REG_EXTENDED;
143 break;
144 case 'I':
145 inplace = optarg;
146 ispan = 1; /* span across input files */
147 break;
148 case 'a':
149 aflag = 1;
150 break;
151 case 'e':
152 eflag = 1;
153 if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL)
154 err(1, "malloc");
155 strcpy(temp_arg, optarg);
156 strcat(temp_arg, "\n");
157 add_compunit(CU_STRING, temp_arg);
158 break;
159 case 'f':
160 fflag = 1;
161 if (strcmp(optarg, "-") == 0)
162 fflagstdin = 1;
163 add_compunit(CU_FILE, optarg);
164 break;
165 case 'i':
166 inplace = optarg;
167 ispan = 0; /* don't span across input files */
168 break;
169 case 'l':
170 if(setvbuf(stdout, NULL, _IOLBF, 0) != 0)
171 warnx("setting line buffered output failed");
172 break;
173 case 'n':
174 nflag = 1;
175 break;
176 case 'u':
177 if(setvbuf(stdout, NULL, _IONBF, 0) != 0)
178 warnx("setting unbuffered output failed");
179 break;
180 default:
181 case '?':
182 usage();
183 }
184 argc -= optind;
185 argv += optind;
186
187 /* First usage case; script is the first arg */
188 if (!eflag && !fflag && *argv) {
189 add_compunit(CU_STRING, *argv);
190 argv++;
191 }
192
193 compile();
194
195 /* Continue with first and start second usage */
196 if (*argv)
197 for (; *argv; argv++)
198 add_file(*argv);
199 else if (fflagstdin)
200 exit(rval);
201 else
202 add_file(NULL);
203 process();
204 cfclose(prog, NULL);
205 if (fclose(stdout))
206 err(1, "stdout");
207 exit(rval);
208 }
209
210 static void
usage(void)211 usage(void)
212 {
213 (void)fprintf(stderr,
214 "usage: %s script [-Ealnru] [-i extension] [file ...]\n"
215 "\t%s [-Ealnu] [-i extension] [-e script] ... [-f script_file]"
216 " ... [file ...]\n", getprogname(), getprogname());
217 exit(1);
218 }
219
220 /*
221 * Like fgets, but go through the chain of compilation units chaining them
222 * together. Empty strings and files are ignored.
223 */
224 char *
cu_fgets(char * buf,int n,int * more)225 cu_fgets(char *buf, int n, int *more)
226 {
227 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
228 static FILE *f; /* Current open file */
229 static char *s; /* Current pointer inside string */
230 static char string_ident[30];
231 char *p;
232
233 again:
234 switch (state) {
235 case ST_EOF:
236 if (script == NULL) {
237 if (more != NULL)
238 *more = 0;
239 return (NULL);
240 }
241 linenum = 0;
242 switch (script->type) {
243 case CU_FILE:
244 if (strcmp(script->s, "-") == 0) {
245 f = stdin;
246 fname = "stdin";
247 } else {
248 if ((f = fopen(script->s, "r")) == NULL)
249 err(1, "%s", script->s);
250 fname = script->s;
251 }
252 state = ST_FILE;
253 goto again;
254 case CU_STRING:
255 if (((size_t)snprintf(string_ident,
256 sizeof(string_ident), "\"%s\"", script->s)) >=
257 sizeof(string_ident) - 1)
258 (void)strcpy(string_ident +
259 sizeof(string_ident) - 6, " ...\"");
260 fname = string_ident;
261 s = script->s;
262 state = ST_STRING;
263 goto again;
264 default:
265 __unreachable();
266 }
267 case ST_FILE:
268 if ((p = fgets(buf, n, f)) != NULL) {
269 linenum++;
270 if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
271 nflag = 1;
272 if (more != NULL)
273 *more = !feof(f);
274 return (p);
275 }
276 script = script->next;
277 (void)fclose(f);
278 state = ST_EOF;
279 goto again;
280 case ST_STRING:
281 if (linenum == 0 && s[0] == '#' && s[1] == 'n')
282 nflag = 1;
283 p = buf;
284 for (;;) {
285 if (n-- <= 1) {
286 *p = '\0';
287 linenum++;
288 if (more != NULL)
289 *more = 1;
290 return (buf);
291 }
292 switch (*s) {
293 case '\0':
294 state = ST_EOF;
295 if (s == script->s) {
296 script = script->next;
297 goto again;
298 } else {
299 script = script->next;
300 *p = '\0';
301 linenum++;
302 if (more != NULL)
303 *more = 0;
304 return (buf);
305 }
306 case '\n':
307 *p++ = '\n';
308 *p = '\0';
309 s++;
310 linenum++;
311 if (more != NULL)
312 *more = 0;
313 return (buf);
314 default:
315 *p++ = *s++;
316 }
317 }
318 }
319 /* NOTREACHED */
320 return (NULL);
321 }
322
323 /*
324 * Like fgets, but go through the list of files chaining them together.
325 * Set len to the length of the line.
326 */
327 int
mf_fgets(SPACE * sp,enum e_spflag spflag)328 mf_fgets(SPACE *sp, enum e_spflag spflag)
329 {
330 struct stat sb;
331 ssize_t len;
332 char *dirbuf, *basebuf;
333 static char *p = NULL;
334 static size_t plen = 0;
335 int c;
336 static int firstfile;
337
338 if (infile == NULL) {
339 /* stdin? */
340 if (files->fname == NULL) {
341 if (inplace != NULL)
342 errx(1, "-I or -i may not be used with stdin");
343 infile = stdin;
344 fname = "stdin";
345 outfile = stdout;
346 outfname = "stdout";
347 }
348 firstfile = 1;
349 }
350
351 for (;;) {
352 if (infile != NULL && (c = getc(infile)) != EOF && !quit) {
353 (void)ungetc(c, infile);
354 break;
355 }
356 /* If we are here then either eof or no files are open yet */
357 if (infile == stdin) {
358 sp->len = 0;
359 return (0);
360 }
361 if (infile != NULL) {
362 fclose(infile);
363 if (*oldfname != '\0') {
364 /* if there was a backup file, remove it */
365 unlink(oldfname);
366 /*
367 * Backup the original. Note that hard links
368 * are not supported on all filesystems.
369 */
370 if ((link(fname, oldfname) != 0) &&
371 (rename(fname, oldfname) != 0)) {
372 warn("rename()");
373 if (*tmpfname)
374 unlink(tmpfname);
375 exit(1);
376 }
377 *oldfname = '\0';
378 }
379 if (*tmpfname != '\0') {
380 if (outfile != NULL && outfile != stdout)
381 if (fclose(outfile) != 0) {
382 warn("fclose()");
383 unlink(tmpfname);
384 exit(1);
385 }
386 outfile = NULL;
387 if (rename(tmpfname, fname) != 0) {
388 /* this should not happen really! */
389 warn("rename()");
390 unlink(tmpfname);
391 exit(1);
392 }
393 *tmpfname = '\0';
394 }
395 outfname = NULL;
396 }
397 if (firstfile == 0)
398 files = files->next;
399 else
400 firstfile = 0;
401 if (files == NULL) {
402 sp->len = 0;
403 return (0);
404 }
405 fname = files->fname;
406 if (inplace != NULL) {
407 if (lstat(fname, &sb) != 0)
408 err(1, "%s", fname);
409 if (!S_ISREG(sb.st_mode))
410 errx(1, "%s: %s %s", fname,
411 "in-place editing only",
412 "works for regular files");
413 if (*inplace != '\0') {
414 strlcpy(oldfname, fname,
415 sizeof(oldfname));
416 len = strlcat(oldfname, inplace,
417 sizeof(oldfname));
418 if (len > (ssize_t)sizeof(oldfname))
419 errx(1, "%s: name too long", fname);
420 }
421 if ((dirbuf = strdup(fname)) == NULL ||
422 (basebuf = strdup(fname)) == NULL)
423 err(1, "strdup");
424 len = snprintf(tmpfname, sizeof(tmpfname),
425 "%s/.!%ld!%s", dirname(dirbuf), (long)getpid(),
426 basename(basebuf));
427 free(dirbuf);
428 free(basebuf);
429 if (len >= (ssize_t)sizeof(tmpfname))
430 errx(1, "%s: name too long", fname);
431 unlink(tmpfname);
432 if (outfile != NULL && outfile != stdout)
433 fclose(outfile);
434 if ((outfile = fopen(tmpfname, "w")) == NULL)
435 err(1, "%s", fname);
436 fchown(fileno(outfile), sb.st_uid, sb.st_gid);
437 fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
438 outfname = tmpfname;
439 if (!ispan) {
440 linenum = 0;
441 resetstate();
442 }
443 } else {
444 outfile = stdout;
445 outfname = "stdout";
446 }
447 if ((infile = fopen(fname, "r")) == NULL) {
448 warn("%s", fname);
449 rval = 1;
450 continue;
451 }
452 }
453 /*
454 * We are here only when infile is open and we still have something
455 * to read from it.
456 *
457 * Use getline() so that we can handle essentially infinite input
458 * data. The p and plen are static so each invocation gives
459 * getline() the same buffer which is expanded as needed.
460 */
461 len = getline(&p, &plen, infile);
462 if (len == -1)
463 err(1, "%s", fname);
464 if (len != 0 && p[len - 1] == '\n') {
465 sp->append_newline = 1;
466 len--;
467 } else if (!lastline()) {
468 sp->append_newline = 1;
469 } else {
470 sp->append_newline = 0;
471 }
472 cspace(sp, p, len, spflag);
473
474 linenum++;
475
476 return (1);
477 }
478
479 /*
480 * Add a compilation unit to the linked list
481 */
482 static void
add_compunit(enum e_cut type,char * s)483 add_compunit(enum e_cut type, char *s)
484 {
485 struct s_compunit *cu;
486
487 if ((cu = malloc(sizeof(struct s_compunit))) == NULL)
488 err(1, "malloc");
489 cu->type = type;
490 cu->s = s;
491 cu->next = NULL;
492 *cu_nextp = cu;
493 cu_nextp = &cu->next;
494 }
495
496 /*
497 * Add a file to the linked list
498 */
499 static void
add_file(char * s)500 add_file(char *s)
501 {
502 struct s_flist *fp;
503
504 if ((fp = malloc(sizeof(struct s_flist))) == NULL)
505 err(1, "malloc");
506 fp->next = NULL;
507 *fl_nextp = fp;
508 fp->fname = s;
509 fl_nextp = &fp->next;
510 }
511
512 static int
next_files_have_lines(void)513 next_files_have_lines(void)
514 {
515 struct s_flist *file;
516 FILE *file_fd;
517 int ch;
518
519 file = files;
520 while ((file = file->next) != NULL) {
521 if ((file_fd = fopen(file->fname, "r")) == NULL)
522 continue;
523
524 if ((ch = getc(file_fd)) != EOF) {
525 /*
526 * This next file has content, therefore current
527 * file doesn't contains the last line.
528 */
529 ungetc(ch, file_fd);
530 fclose(file_fd);
531 return (1);
532 }
533
534 fclose(file_fd);
535 }
536
537 return (0);
538 }
539
540 int
lastline(void)541 lastline(void)
542 {
543 int ch;
544
545 if (feof(infile)) {
546 return !(
547 (inplace == NULL || ispan) &&
548 next_files_have_lines());
549 }
550 if ((ch = getc(infile)) == EOF) {
551 return !(
552 (inplace == NULL || ispan) &&
553 next_files_have_lines());
554 }
555 ungetc(ch, infile);
556 return (0);
557 }
558