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/types.h>
38 #include <sys/mman.h>
39 #include <sys/param.h>
40 #include <sys/stat.h>
41
42 #include <err.h>
43 #include <errno.h>
44 #include <fcntl.h>
45 #include <libgen.h>
46 #include <limits.h>
47 #include <locale.h>
48 #include <regex.h>
49 #include <stddef.h>
50 #include <stdio.h>
51 #include <stdlib.h>
52 #include <string.h>
53 #include <unistd.h>
54
55 #include "defs.h"
56 #include "extern.h"
57
58 /*
59 * Linked list of units (strings and files) to be compiled
60 */
61 struct s_compunit {
62 struct s_compunit *next;
63 enum e_cut {CU_FILE, CU_STRING} type;
64 char *s; /* Pointer to string or fname */
65 };
66
67 /*
68 * Linked list pointer to compilation units and pointer to current
69 * next pointer.
70 */
71 static struct s_compunit *script, **cu_nextp = &script;
72
73 /*
74 * Linked list of files to be processed
75 */
76 struct s_flist {
77 char *fname;
78 struct s_flist *next;
79 };
80
81 /*
82 * Linked list pointer to files and pointer to current
83 * next pointer.
84 */
85 static struct s_flist *files, **fl_nextp = &files;
86
87 FILE *infile; /* Current input file */
88 FILE *outfile; /* Current output file */
89
90 int aflag, eflag, nflag;
91 int rflags = 0;
92 int quit = 0;
93 static int rval; /* Exit status */
94
95 static int ispan; /* Whether inplace editing spans across files */
96
97 /*
98 * Current file and line number; line numbers restart across compilation
99 * units, but span across input files. The latter is optional if editing
100 * in place.
101 */
102 const char *fname; /* File name. */
103 const char *outfname; /* Output file name */
104 static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */
105 static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */
106 const char *inplace; /* Inplace edit file extension. */
107 u_long linenum;
108
109 static void add_compunit(enum e_cut, char *);
110 static void add_file(char *);
111 static void usage(void) __dead2;
112
113 int
main(int argc,char * argv[])114 main(int argc, char *argv[])
115 {
116 int c, fflag, fflagstdin;
117 char *temp_arg;
118
119 (void) setlocale(LC_ALL, "");
120
121 fflag = 0;
122 fflagstdin = 0;
123 inplace = NULL;
124
125 while ((c = getopt(argc, argv, "EI:ae:f:i:lnru")) != -1)
126 switch (c) {
127 case 'r': /* Gnu sed compat */
128 case 'E':
129 rflags = REG_EXTENDED;
130 break;
131 case 'I':
132 inplace = optarg;
133 ispan = 1; /* span across input files */
134 break;
135 case 'a':
136 aflag = 1;
137 break;
138 case 'e':
139 eflag = 1;
140 if (asprintf(&temp_arg, "%s\n", optarg) == -1)
141 err(1, "asprintf");
142 add_compunit(CU_STRING, temp_arg);
143 break;
144 case 'f':
145 fflag = 1;
146 if (strcmp(optarg, "-") == 0)
147 fflagstdin = 1;
148 add_compunit(CU_FILE, optarg);
149 break;
150 case 'i':
151 inplace = optarg;
152 ispan = 0; /* don't span across input files */
153 break;
154 case 'l':
155 if(setvbuf(stdout, NULL, _IOLBF, 0) != 0)
156 warnx("setting line buffered output failed");
157 break;
158 case 'n':
159 nflag = 1;
160 break;
161 case 'u':
162 if(setvbuf(stdout, NULL, _IONBF, 0) != 0)
163 warnx("setting unbuffered output failed");
164 break;
165 default:
166 case '?':
167 usage();
168 }
169 argc -= optind;
170 argv += optind;
171
172 /* First usage case; script is the first arg */
173 if (!eflag && !fflag && *argv) {
174 if (asprintf(&temp_arg, "%s\n", *argv) == -1)
175 err(1, "asprintf");
176 add_compunit(CU_STRING, temp_arg);
177 argv++;
178 }
179
180 compile();
181
182 /* Continue with first and start second usage */
183 if (*argv)
184 for (; *argv; argv++)
185 add_file(*argv);
186 else if (fflagstdin)
187 exit(rval);
188 else
189 add_file(NULL);
190 process();
191 cfclose(prog, NULL);
192 if (fclose(stdout))
193 err(1, "stdout");
194 exit(rval);
195 }
196
197 static void
usage(void)198 usage(void)
199 {
200 (void)fprintf(stderr,
201 "usage: %s script [-Ealnru] [-i extension] [file ...]\n"
202 "\t%s [-Ealnu] [-i extension] [-e script] ... [-f script_file]"
203 " ... [file ...]\n", getprogname(), getprogname());
204 exit(1);
205 }
206
207 /*
208 * Like fgets, but go through the chain of compilation units chaining them
209 * together. Empty strings and files are ignored.
210 */
211 char *
cu_fgets(char * buf,int n,int * more)212 cu_fgets(char *buf, int n, int *more)
213 {
214 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
215 static FILE *f; /* Current open file */
216 static char *s; /* Current pointer inside string */
217 static char string_ident[30];
218 char *p;
219
220 again:
221 switch (state) {
222 case ST_EOF:
223 if (script == NULL) {
224 if (more != NULL)
225 *more = 0;
226 return (NULL);
227 }
228 linenum = 0;
229 switch (script->type) {
230 case CU_FILE:
231 if (strcmp(script->s, "-") == 0) {
232 f = stdin;
233 fname = "stdin";
234 } else {
235 if ((f = fopen(script->s, "r")) == NULL)
236 err(1, "%s", script->s);
237 fname = script->s;
238 }
239 state = ST_FILE;
240 goto again;
241 case CU_STRING:
242 if (((size_t)snprintf(string_ident,
243 sizeof(string_ident), "\"%s\"", script->s)) >=
244 sizeof(string_ident) - 1)
245 (void)strcpy(string_ident +
246 sizeof(string_ident) - 6, " ...\"");
247 fname = string_ident;
248 s = script->s;
249 state = ST_STRING;
250 goto again;
251 default:
252 __unreachable();
253 }
254 case ST_FILE:
255 if ((p = fgets(buf, n, f)) != NULL) {
256 linenum++;
257 if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
258 nflag = 1;
259 if (more != NULL)
260 *more = !feof(f);
261 return (p);
262 }
263 script = script->next;
264 (void)fclose(f);
265 state = ST_EOF;
266 goto again;
267 case ST_STRING:
268 if (linenum == 0 && s[0] == '#' && s[1] == 'n')
269 nflag = 1;
270 p = buf;
271 for (;;) {
272 if (n-- <= 1) {
273 *p = '\0';
274 linenum++;
275 if (more != NULL)
276 *more = 1;
277 return (buf);
278 }
279 switch (*s) {
280 case '\0':
281 state = ST_EOF;
282 if (s == script->s) {
283 script = script->next;
284 goto again;
285 } else {
286 script = script->next;
287 *p = '\0';
288 linenum++;
289 if (more != NULL)
290 *more = 0;
291 return (buf);
292 }
293 case '\n':
294 *p++ = '\n';
295 *p = '\0';
296 s++;
297 linenum++;
298 if (more != NULL)
299 *more = 0;
300 return (buf);
301 default:
302 *p++ = *s++;
303 }
304 }
305 }
306 /* NOTREACHED */
307 return (NULL);
308 }
309
310 /*
311 * Like fgets, but go through the list of files chaining them together.
312 * Set len to the length of the line.
313 */
314 int
mf_fgets(SPACE * sp,enum e_spflag spflag)315 mf_fgets(SPACE *sp, enum e_spflag spflag)
316 {
317 struct stat sb;
318 ssize_t len;
319 char *dirbuf, *basebuf;
320 static char *p = NULL;
321 static size_t plen = 0;
322 int c;
323 static int firstfile;
324
325 if (infile == NULL) {
326 /* stdin? */
327 if (files->fname == NULL) {
328 if (inplace != NULL)
329 errx(1, "-I or -i may not be used with stdin");
330 infile = stdin;
331 fname = "stdin";
332 outfile = stdout;
333 outfname = "stdout";
334 }
335 firstfile = 1;
336 }
337
338 for (;;) {
339 if (infile != NULL && (c = getc(infile)) != EOF && !quit) {
340 (void)ungetc(c, infile);
341 break;
342 }
343 /* If we are here then either eof or no files are open yet */
344 if (infile == stdin) {
345 sp->len = 0;
346 return (0);
347 }
348 if (infile != NULL) {
349 fclose(infile);
350 if (*oldfname != '\0') {
351 /* if there was a backup file, remove it */
352 unlink(oldfname);
353 /*
354 * Backup the original. Note that hard links
355 * are not supported on all filesystems.
356 */
357 if ((link(fname, oldfname) != 0) &&
358 (rename(fname, oldfname) != 0)) {
359 warn("rename()");
360 if (*tmpfname)
361 unlink(tmpfname);
362 exit(1);
363 }
364 *oldfname = '\0';
365 }
366 if (*tmpfname != '\0') {
367 if (outfile != NULL && outfile != stdout)
368 if (fclose(outfile) != 0) {
369 warn("fclose()");
370 unlink(tmpfname);
371 exit(1);
372 }
373 outfile = NULL;
374 if (rename(tmpfname, fname) != 0) {
375 /* this should not happen really! */
376 warn("rename()");
377 unlink(tmpfname);
378 exit(1);
379 }
380 *tmpfname = '\0';
381 }
382 outfname = NULL;
383 }
384 if (firstfile == 0)
385 files = files->next;
386 else
387 firstfile = 0;
388 if (files == NULL) {
389 sp->len = 0;
390 return (0);
391 }
392 fname = files->fname;
393 if (inplace != NULL) {
394 if (lstat(fname, &sb) != 0)
395 err(1, "%s", fname);
396 if (!S_ISREG(sb.st_mode))
397 errx(1, "%s: %s %s", fname,
398 "in-place editing only",
399 "works for regular files");
400 if (*inplace != '\0') {
401 strlcpy(oldfname, fname,
402 sizeof(oldfname));
403 len = strlcat(oldfname, inplace,
404 sizeof(oldfname));
405 if (len > (ssize_t)sizeof(oldfname))
406 errx(1, "%s: name too long", fname);
407 }
408 if ((dirbuf = strdup(fname)) == NULL ||
409 (basebuf = strdup(fname)) == NULL)
410 err(1, "strdup");
411 len = snprintf(tmpfname, sizeof(tmpfname),
412 "%s/.!%ld!%s", dirname(dirbuf), (long)getpid(),
413 basename(basebuf));
414 free(dirbuf);
415 free(basebuf);
416 if (len >= (ssize_t)sizeof(tmpfname))
417 errx(1, "%s: name too long", fname);
418 unlink(tmpfname);
419 if (outfile != NULL && outfile != stdout)
420 fclose(outfile);
421 if ((outfile = fopen(tmpfname, "w")) == NULL)
422 err(1, "%s", fname);
423 fchown(fileno(outfile), sb.st_uid, sb.st_gid);
424 fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
425 outfname = tmpfname;
426 if (!ispan) {
427 linenum = 0;
428 resetstate();
429 }
430 } else {
431 outfile = stdout;
432 outfname = "stdout";
433 }
434 if ((infile = fopen(fname, "r")) == NULL) {
435 warn("%s", fname);
436 rval = 1;
437 continue;
438 }
439 }
440 /*
441 * We are here only when infile is open and we still have something
442 * to read from it.
443 *
444 * Use getline() so that we can handle essentially infinite input
445 * data. The p and plen are static so each invocation gives
446 * getline() the same buffer which is expanded as needed.
447 */
448 len = getline(&p, &plen, infile);
449 if (len == -1)
450 err(1, "%s", fname);
451 if (len != 0 && p[len - 1] == '\n') {
452 sp->append_newline = 1;
453 len--;
454 } else if (!lastline()) {
455 sp->append_newline = 1;
456 } else {
457 sp->append_newline = 0;
458 }
459 cspace(sp, p, len, spflag);
460
461 linenum++;
462
463 return (1);
464 }
465
466 /*
467 * Add a compilation unit to the linked list
468 */
469 static void
add_compunit(enum e_cut type,char * s)470 add_compunit(enum e_cut type, char *s)
471 {
472 struct s_compunit *cu;
473
474 if ((cu = malloc(sizeof(struct s_compunit))) == NULL)
475 err(1, "malloc");
476 cu->type = type;
477 cu->s = s;
478 cu->next = NULL;
479 *cu_nextp = cu;
480 cu_nextp = &cu->next;
481 }
482
483 /*
484 * Add a file to the linked list
485 */
486 static void
add_file(char * s)487 add_file(char *s)
488 {
489 struct s_flist *fp;
490
491 if ((fp = malloc(sizeof(struct s_flist))) == NULL)
492 err(1, "malloc");
493 fp->next = NULL;
494 *fl_nextp = fp;
495 fp->fname = s;
496 fl_nextp = &fp->next;
497 }
498
499 static int
next_files_have_lines(void)500 next_files_have_lines(void)
501 {
502 struct s_flist *file;
503 FILE *file_fd;
504 int ch;
505
506 file = files;
507 while ((file = file->next) != NULL) {
508 if ((file_fd = fopen(file->fname, "r")) == NULL)
509 continue;
510
511 if ((ch = getc(file_fd)) != EOF) {
512 /*
513 * This next file has content, therefore current
514 * file doesn't contains the last line.
515 */
516 ungetc(ch, file_fd);
517 fclose(file_fd);
518 return (1);
519 }
520
521 fclose(file_fd);
522 }
523
524 return (0);
525 }
526
527 int
lastline(void)528 lastline(void)
529 {
530 int ch;
531
532 if (feof(infile)) {
533 return !(
534 (inplace == NULL || ispan) &&
535 next_files_have_lines());
536 }
537 if ((ch = getc(infile)) == EOF) {
538 return !(
539 (inplace == NULL || ispan) &&
540 next_files_have_lines());
541 }
542 ungetc(ch, infile);
543 return (0);
544 }
545