1 /* $OpenBSD: main.c,v 1.44 2023/02/08 08:18:11 tb Exp $ */
2
3 /*-
4 * Copyright (c) 1992 Diomidis Spinellis.
5 * Copyright (c) 1992, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Diomidis Spinellis of Imperial College, University of London.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <sys/types.h>
37 #include <sys/ioctl.h>
38 #include <sys/stat.h>
39
40 #include <ctype.h>
41 #include <errno.h>
42 #include <fcntl.h>
43 #include <limits.h>
44 #include <regex.h>
45 #include <stddef.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49 #include <unistd.h>
50 #include <libgen.h>
51
52 #include "defs.h"
53 #include "extern.h"
54
55 /*
56 * Linked list of units (strings and files) to be compiled
57 */
58 struct s_compunit {
59 struct s_compunit *next;
60 enum e_cut {CU_FILE, CU_STRING} type;
61 char *s; /* Pointer to string or fname */
62 };
63
64 /*
65 * Linked list pointer to compilation units and pointer to current
66 * next pointer.
67 */
68 static struct s_compunit *script, **cu_nextp = &script;
69
70 /*
71 * Linked list of files to be processed
72 */
73 struct s_flist {
74 char *fname;
75 struct s_flist *next;
76 };
77
78 /*
79 * Linked list pointer to files and pointer to current
80 * next pointer.
81 */
82 static struct s_flist *files, **fl_nextp = &files;
83
84 FILE *infile; /* Current input file */
85 FILE *outfile; /* Current output file */
86
87 int Eflag, aflag, eflag, nflag;
88 static int rval; /* Exit status */
89
90 /*
91 * Current file and line number; line numbers restart across compilation
92 * units, but span across input files. The latter is optional if editing
93 * in place.
94 */
95 const char *fname; /* File name. */
96 const char *outfname; /* Output file name */
97 static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */
98 static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */
99 char *inplace; /* Inplace edit file extension */
100 u_long linenum;
101
102 static void add_compunit(enum e_cut, char *);
103 static void add_file(char *);
104 static int next_files_have_lines(void);
105
106 int termwidth;
107
108 int pledge_wpath, pledge_rpath;
109
110 int
main(int argc,char * argv[])111 main(int argc, char *argv[])
112 {
113 struct winsize win;
114 int c, fflag;
115 char *p;
116
117 fflag = 0;
118 inplace = NULL;
119 while ((c = getopt(argc, argv, "Eae:f:i::nru")) != -1)
120 switch (c) {
121 case 'E':
122 case 'r':
123 Eflag = 1;
124 break;
125 case 'a':
126 aflag = 1;
127 break;
128 case 'e':
129 eflag = 1;
130 add_compunit(CU_STRING, optarg);
131 break;
132 case 'f':
133 fflag = 1;
134 add_compunit(CU_FILE, optarg);
135 break;
136 case 'i':
137 inplace = optarg ? optarg : "";
138 break;
139 case 'n':
140 nflag = 1;
141 break;
142 case 'u':
143 setvbuf(stdout, NULL, _IOLBF, 0);
144 break;
145 default:
146 (void)fprintf(stderr,
147 "usage: sed [-aEnru] [-i[extension]] command [file ...]\n"
148 " sed [-aEnru] [-e command] [-f command_file] [-i[extension]] [file ...]\n");
149 exit(1);
150 }
151 argc -= optind;
152 argv += optind;
153
154 termwidth = 0;
155 if ((p = getenv("COLUMNS")) != NULL)
156 termwidth = strtonum(p, 0, INT_MAX, NULL);
157 if (termwidth == 0 && ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == 0 &&
158 win.ws_col > 0)
159 termwidth = win.ws_col;
160 if (termwidth == 0)
161 termwidth = 80;
162 if (termwidth <= 8)
163 termwidth = 1;
164 else
165 termwidth -= 8;
166
167 if (inplace != NULL) {
168 if (pledge("stdio rpath wpath cpath fattr chown", NULL) == -1)
169 error(FATAL, "pledge: %s", strerror(errno));
170 } else {
171 if (pledge("stdio rpath wpath cpath", NULL) == -1)
172 error(FATAL, "pledge: %s", strerror(errno));
173 }
174
175 /* First usage case; script is the first arg */
176 if (!eflag && !fflag && *argv) {
177 add_compunit(CU_STRING, *argv);
178 argv++;
179 }
180
181 compile();
182
183 /* Continue with first and start second usage */
184 if (*argv) {
185 if (!pledge_wpath && inplace == NULL) {
186 if (pledge("stdio rpath", NULL) == -1)
187 error(FATAL, "pledge: %s", strerror(errno));
188 }
189 for (; *argv; argv++)
190 add_file(*argv);
191 } else {
192 if (!pledge_wpath && !pledge_rpath) {
193 if (pledge("stdio", NULL) == -1)
194 error(FATAL, "pledge: %s", strerror(errno));
195 } else if (pledge_rpath) {
196 if (pledge("stdio rpath", NULL) == -1)
197 error(FATAL, "pledge: %s", strerror(errno));
198 } else if (pledge_wpath) {
199 if (pledge("stdio wpath cpath", NULL) == -1)
200 error(FATAL, "pledge: %s", strerror(errno));
201 }
202 add_file(NULL);
203 }
204 process();
205 cfclose(prog, NULL);
206 if (fclose(stdout))
207 error(FATAL, "stdout: %s", strerror(errno));
208 exit (rval);
209 }
210
211 /*
212 * Like fgets, but go through the chain of compilation units chaining them
213 * together. Empty strings and files are ignored.
214 */
215 char *
cu_fgets(char ** outbuf,size_t * outsize)216 cu_fgets(char **outbuf, size_t *outsize)
217 {
218 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
219 static FILE *f; /* Current open file */
220 static char *s; /* Current pointer inside string */
221 static char string_ident[30];
222 size_t len;
223 char *p;
224
225 if (*outbuf == NULL)
226 *outsize = 0;
227
228 again:
229 switch (state) {
230 case ST_EOF:
231 if (script == NULL)
232 return (NULL);
233 linenum = 0;
234 switch (script->type) {
235 case CU_FILE:
236 if ((f = fopen(script->s, "r")) == NULL)
237 error(FATAL,
238 "%s: %s", script->s, strerror(errno));
239 fname = script->s;
240 state = ST_FILE;
241 goto again;
242 case CU_STRING:
243 len = snprintf(string_ident, sizeof(string_ident),
244 "\"%s\"", script->s);
245 if (len >= sizeof(string_ident))
246 strlcpy(string_ident +
247 sizeof(string_ident) - 6, " ...\"", 5);
248 fname = string_ident;
249 s = script->s;
250 state = ST_STRING;
251 goto again;
252 }
253 case ST_FILE:
254 if (getline(outbuf, outsize, f) != -1) {
255 p = *outbuf;
256 linenum++;
257 if (linenum == 1 && p[0] == '#' && p[1] == 'n')
258 nflag = 1;
259 return (*outbuf);
260 }
261 script = script->next;
262 (void)fclose(f);
263 state = ST_EOF;
264 goto again;
265 case ST_STRING:
266 if (linenum == 0 && s[0] == '#' && s[1] == 'n')
267 nflag = 1;
268 p = *outbuf;
269 len = *outsize;
270 for (;;) {
271 if (len <= 1) {
272 *outbuf = xrealloc(*outbuf,
273 *outsize + _POSIX2_LINE_MAX);
274 p = *outbuf + *outsize - len;
275 len += _POSIX2_LINE_MAX;
276 *outsize += _POSIX2_LINE_MAX;
277 }
278 switch (*s) {
279 case '\0':
280 state = ST_EOF;
281 if (s == script->s) {
282 script = script->next;
283 goto again;
284 } else {
285 script = script->next;
286 *p = '\0';
287 linenum++;
288 return (*outbuf);
289 }
290 case '\n':
291 *p++ = '\n';
292 *p = '\0';
293 s++;
294 linenum++;
295 return (*outbuf);
296 default:
297 *p++ = *s++;
298 len--;
299 }
300 }
301 }
302
303 return (NULL);
304 }
305
306 void
finish_file(void)307 finish_file(void)
308 {
309 if (infile != NULL) {
310 fclose(infile);
311 if (*oldfname != '\0') {
312 if (rename(fname, oldfname) != 0) {
313 warning("rename()");
314 unlink(tmpfname);
315 exit(1);
316 }
317 *oldfname = '\0';
318 }
319 if (*tmpfname != '\0') {
320 if (outfile != NULL && outfile != stdout)
321 fclose(outfile);
322 outfile = NULL;
323 rename(tmpfname, fname);
324 *tmpfname = '\0';
325 }
326 outfname = NULL;
327 }
328 }
329
330 /*
331 * Like fgets, but go through the list of files chaining them together.
332 * Set len to the length of the line.
333 */
334 int
mf_fgets(SPACE * sp,enum e_spflag spflag)335 mf_fgets(SPACE *sp, enum e_spflag spflag)
336 {
337 struct stat sb;
338 size_t len;
339 char dirbuf[PATH_MAX];
340 static char *p;
341 static size_t psize;
342 int c, fd;
343 static int firstfile;
344
345 if (infile == NULL) {
346 /* stdin? */
347 if (files->fname == NULL) {
348 if (inplace != NULL)
349 error(FATAL, "-i may not be used with stdin");
350 infile = stdin;
351 fname = "stdin";
352 outfile = stdout;
353 outfname = "stdout";
354 }
355
356 firstfile = 1;
357 }
358
359 for (;;) {
360 if (infile != NULL && (c = getc(infile)) != EOF) {
361 (void)ungetc(c, infile);
362 break;
363 }
364 /* If we are here then either eof or no files are open yet */
365 if (infile == stdin) {
366 sp->len = 0;
367 return (0);
368 }
369 finish_file();
370 if (firstfile == 0)
371 files = files->next;
372 else
373 firstfile = 0;
374 if (files == NULL) {
375 sp->len = 0;
376 return (0);
377 }
378 fname = files->fname;
379 if (inplace != NULL) {
380 if (lstat(fname, &sb) != 0)
381 error(FATAL, "%s: %s", fname,
382 strerror(errno ? errno : EIO));
383 if (!S_ISREG(sb.st_mode))
384 error(FATAL, "%s: %s %s", fname,
385 "in-place editing only",
386 "works for regular files");
387 if (*inplace != '\0') {
388 strlcpy(oldfname, fname,
389 sizeof(oldfname));
390 len = strlcat(oldfname, inplace,
391 sizeof(oldfname));
392 if (len > sizeof(oldfname))
393 error(FATAL, "%s: name too long", fname);
394 }
395 strlcpy(dirbuf, fname, sizeof(dirbuf));
396 len = snprintf(tmpfname, sizeof(tmpfname),
397 "%s/sedXXXXXXXXXX", dirname(dirbuf));
398 if (len >= sizeof(tmpfname))
399 error(FATAL, "%s: name too long", fname);
400 if ((fd = mkstemp(tmpfname)) == -1)
401 error(FATAL, "%s: %s", fname, strerror(errno));
402 if ((outfile = fdopen(fd, "w")) == NULL) {
403 unlink(tmpfname);
404 error(FATAL, "%s", fname);
405 }
406 fchown(fileno(outfile), sb.st_uid, sb.st_gid);
407 fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
408 outfname = tmpfname;
409 linenum = 0;
410 resetstate();
411 } else {
412 outfile = stdout;
413 outfname = "stdout";
414 }
415 if ((infile = fopen(fname, "r")) == NULL) {
416 warning("%s", strerror(errno));
417 rval = 1;
418 continue;
419 }
420 }
421
422 /*
423 * We are here only when infile is open and we still have something
424 * to read from it.
425 *
426 * Use getline() so that we can handle essentially infinite input
427 * data. The p and psize are static so each invocation gives
428 * getline() the same buffer which is expanded as needed.
429 */
430 len = getline(&p, &psize, infile);
431 if ((ssize_t)len == -1)
432 error(FATAL, "%s: %s", fname, strerror(errno));
433 if (len != 0 && p[len - 1] == '\n') {
434 sp->append_newline = 1;
435 len--;
436 } else if (!lastline()) {
437 sp->append_newline = 1;
438 } else {
439 sp->append_newline = 0;
440 }
441 cspace(sp, p, len, spflag);
442
443 linenum++;
444
445 return (1);
446 }
447
448 /*
449 * Add a compilation unit to the linked list
450 */
451 static void
add_compunit(enum e_cut type,char * s)452 add_compunit(enum e_cut type, char *s)
453 {
454 struct s_compunit *cu;
455
456 cu = xmalloc(sizeof(struct s_compunit));
457 cu->type = type;
458 cu->s = s;
459 cu->next = NULL;
460 *cu_nextp = cu;
461 cu_nextp = &cu->next;
462 }
463
464 /*
465 * Add a file to the linked list
466 */
467 static void
add_file(char * s)468 add_file(char *s)
469 {
470 struct s_flist *fp;
471
472 fp = xmalloc(sizeof(struct s_flist));
473 fp->next = NULL;
474 *fl_nextp = fp;
475 fp->fname = s;
476 fl_nextp = &fp->next;
477 }
478
479
480 static int
next_files_have_lines(void)481 next_files_have_lines(void)
482 {
483 struct s_flist *file;
484 FILE *file_fd;
485 int ch;
486
487 file = files;
488 while ((file = file->next) != NULL) {
489 if ((file_fd = fopen(file->fname, "r")) == NULL)
490 continue;
491
492 if ((ch = getc(file_fd)) != EOF) {
493 /*
494 * This next file has content, therefore current
495 * file doesn't contains the last line.
496 */
497 ungetc(ch, file_fd);
498 fclose(file_fd);
499 return (1);
500 }
501 fclose(file_fd);
502 }
503 return (0);
504 }
505
506 int
lastline(void)507 lastline(void)
508 {
509 int ch;
510
511 if (feof(infile)) {
512 return !(
513 (inplace == NULL) &&
514 next_files_have_lines());
515 }
516 if ((ch = getc(infile)) == EOF) {
517 return !(
518 (inplace == NULL) &&
519 next_files_have_lines());
520 }
521 ungetc(ch, infile);
522 return (0);
523 }
524