1 /* $NetBSD: main.c,v 1.34 2015/03/12 12:40:41 christos Exp $ */
2
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 #if HAVE_NBTOOL_CONFIG_H
38 #include "nbtool_config.h"
39 #endif
40
41 #include <sys/cdefs.h>
42 __RCSID("$NetBSD: main.c,v 1.34 2015/03/12 12:40:41 christos Exp $");
43 #ifdef __FBSDID
44 __FBSDID("$FreeBSD: head/usr.bin/sed/main.c 252231 2013-06-26 04:14:19Z pfg $");
45 #endif
46
47 #ifndef lint
48 __COPYRIGHT("@(#) Copyright (c) 1992, 1993\
49 The Regents of the University of California. All rights reserved.");
50 #endif
51
52 #if 0
53 static const char sccsid[] = "@(#)main.c 8.2 (Berkeley) 1/3/94";
54 #endif
55
56 #include <sys/types.h>
57 #include <sys/mman.h>
58 #include <sys/param.h>
59 #include <sys/stat.h>
60
61 #include <err.h>
62 #include <errno.h>
63 #include <fcntl.h>
64 #include <libgen.h>
65 #include <limits.h>
66 #include <locale.h>
67 #include <regex.h>
68 #include <stddef.h>
69 #define _WITH_GETLINE
70 #include <stdio.h>
71 #include <stdlib.h>
72 #include <string.h>
73 #include <unistd.h>
74
75 #include "defs.h"
76 #include "extern.h"
77
78 /*
79 * Linked list of units (strings and files) to be compiled
80 */
81 struct s_compunit {
82 struct s_compunit *next;
83 enum e_cut {CU_FILE, CU_STRING} type;
84 char *s; /* Pointer to string or fname */
85 };
86
87 /*
88 * Linked list pointer to compilation units and pointer to current
89 * next pointer.
90 */
91 static struct s_compunit *script, **cu_nextp = &script;
92
93 /*
94 * Linked list of files to be processed
95 */
96 struct s_flist {
97 char *fname;
98 struct s_flist *next;
99 };
100
101 /*
102 * Linked list pointer to files and pointer to current
103 * next pointer.
104 */
105 static struct s_flist *files, **fl_nextp = &files;
106
107 FILE *infile; /* Current input file */
108 FILE *outfile; /* Current output file */
109
110 int aflag, eflag, nflag;
111 int rflags = 0;
112 static int rval; /* Exit status */
113
114 static int ispan; /* Whether inplace editing spans across files */
115
116 /*
117 * Current file and line number; line numbers restart across compilation
118 * units, but span across input files. The latter is optional if editing
119 * in place.
120 */
121 const char *fname; /* File name. */
122 const char *outfname; /* Output file name */
123 static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */
124 static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */
125 static const char *inplace; /* Inplace edit file extension. */
126 u_long linenum;
127
128 static void add_compunit(enum e_cut, char *);
129 static void add_file(char *);
130 static void usage(void) __dead;
131
132 int
main(int argc,char * argv[])133 main(int argc, char *argv[])
134 {
135 int c, fflag;
136 char *temp_arg;
137
138 setprogname(argv[0]);
139 (void) setlocale(LC_ALL, "");
140
141 fflag = 0;
142 inplace = NULL;
143
144 while ((c = getopt(argc, argv, "EI::ae:f:i::lnru")) != -1)
145 switch (c) {
146 case 'r': /* Gnu sed compat */
147 case 'E':
148 rflags = REG_EXTENDED;
149 break;
150 case 'I':
151 inplace = optarg ? optarg : __UNCONST("");
152 ispan = 1; /* span across input files */
153 break;
154 case 'a':
155 aflag = 1;
156 break;
157 case 'e':
158 eflag = 1;
159 temp_arg = xmalloc(strlen(optarg) + 2);
160 strcpy(temp_arg, optarg);
161 strcat(temp_arg, "\n");
162 add_compunit(CU_STRING, temp_arg);
163 break;
164 case 'f':
165 fflag = 1;
166 add_compunit(CU_FILE, optarg);
167 break;
168 case 'i':
169 inplace = optarg ? optarg : __UNCONST("");
170 ispan = 0; /* don't span across input files */
171 break;
172 case 'l':
173 #ifdef _IOLBF
174 c = setvbuf(stdout, NULL, _IOLBF, 0);
175 #else
176 c = setlinebuf(stdout);
177 #endif
178 if (c)
179 warn("setting line buffered output failed");
180 break;
181 case 'n':
182 nflag = 1;
183 break;
184 case 'u':
185 #ifdef _IONBF
186 c = setvbuf(stdout, NULL, _IONBF, 0);
187 #else
188 c = -1;
189 errno = EOPNOTSUPP;
190 #endif
191 if (c)
192 warn("setting unbuffered output failed");
193 break;
194 default:
195 case '?':
196 usage();
197 }
198 argc -= optind;
199 argv += optind;
200
201 /* First usage case; script is the first arg */
202 if (!eflag && !fflag && *argv) {
203 add_compunit(CU_STRING, *argv);
204 argv++;
205 }
206
207 compile();
208
209 /* Continue with first and start second usage */
210 if (*argv)
211 for (; *argv; argv++)
212 add_file(*argv);
213 else
214 add_file(NULL);
215 process();
216 cfclose(prog, NULL);
217 if (fclose(stdout))
218 err(1, "stdout");
219 exit(rval);
220 }
221
222 static void
usage(void)223 usage(void)
224 {
225 (void)fprintf(stderr,
226 "Usage: %s [-aElnru] command [file ...]\n"
227 "\t%s [-aElnru] [-e command] [-f command_file] [-I[extension]]\n"
228 "\t [-i[extension]] [file ...]\n", getprogname(), getprogname());
229 exit(1);
230 }
231
232 /*
233 * Like fgets, but go through the chain of compilation units chaining them
234 * together. Empty strings and files are ignored.
235 */
236 char *
cu_fgets(char * buf,int n,int * more)237 cu_fgets(char *buf, int n, int *more)
238 {
239 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
240 static FILE *f; /* Current open file */
241 static char *s; /* Current pointer inside string */
242 static char string_ident[30];
243 char *p;
244
245 again:
246 switch (state) {
247 case ST_EOF:
248 if (script == NULL) {
249 if (more != NULL)
250 *more = 0;
251 return (NULL);
252 }
253 linenum = 0;
254 switch (script->type) {
255 case CU_FILE:
256 if ((f = fopen(script->s, "r")) == NULL)
257 err(1, "%s", script->s);
258 fname = script->s;
259 state = ST_FILE;
260 goto again;
261 case CU_STRING:
262 if (((size_t)snprintf(string_ident,
263 sizeof(string_ident), "\"%s\"", script->s)) >=
264 sizeof(string_ident) - 1)
265 (void)strcpy(string_ident +
266 sizeof(string_ident) - 6, " ...\"");
267 fname = string_ident;
268 s = script->s;
269 state = ST_STRING;
270 goto again;
271 }
272 case ST_FILE:
273 if ((p = fgets(buf, n, f)) != NULL) {
274 linenum++;
275 if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
276 nflag = 1;
277 if (more != NULL)
278 *more = !feof(f);
279 return (p);
280 }
281 script = script->next;
282 (void)fclose(f);
283 state = ST_EOF;
284 goto again;
285 case ST_STRING:
286 if (linenum == 0 && s[0] == '#' && s[1] == 'n')
287 nflag = 1;
288 p = buf;
289 for (;;) {
290 if (n-- <= 1) {
291 *p = '\0';
292 linenum++;
293 if (more != NULL)
294 *more = 1;
295 return (buf);
296 }
297 switch (*s) {
298 case '\0':
299 state = ST_EOF;
300 if (s == script->s) {
301 script = script->next;
302 goto again;
303 } else {
304 script = script->next;
305 *p = '\0';
306 linenum++;
307 if (more != NULL)
308 *more = 0;
309 return (buf);
310 }
311 case '\n':
312 *p++ = '\n';
313 *p = '\0';
314 s++;
315 linenum++;
316 if (more != NULL)
317 *more = 0;
318 return (buf);
319 default:
320 *p++ = *s++;
321 }
322 }
323 }
324 /* NOTREACHED */
325 return (NULL);
326 }
327
328 /*
329 * Like fgets, but go through the list of files chaining them together.
330 * Set len to the length of the line.
331 */
332 int
mf_fgets(SPACE * sp,enum e_spflag spflag)333 mf_fgets(SPACE *sp, enum e_spflag spflag)
334 {
335 struct stat sb;
336 size_t len;
337 static char *p = NULL;
338 static size_t plen = 0;
339 int c;
340 static int firstfile;
341
342 if (infile == NULL) {
343 /* stdin? */
344 if (files->fname == NULL) {
345 if (inplace != NULL)
346 errx(1, "-I or -i may not be used with stdin");
347 infile = stdin;
348 fname = "stdin";
349 outfile = stdout;
350 outfname = "stdout";
351 }
352 firstfile = 1;
353 }
354
355 for (;;) {
356 if (infile != NULL && (c = getc(infile)) != EOF) {
357 (void)ungetc(c, infile);
358 break;
359 }
360 /* If we are here then either eof or no files are open yet */
361 if (infile == stdin) {
362 sp->len = 0;
363 return (0);
364 }
365 if (infile != NULL) {
366 fclose(infile);
367 if (*oldfname != '\0') {
368 /* if there was a backup file, remove it */
369 unlink(oldfname);
370 /*
371 * Backup the original. Note that hard links
372 * are not supported on all filesystems.
373 */
374 if ((link(fname, oldfname) != 0) &&
375 (rename(fname, oldfname) != 0)) {
376 warn("rename()");
377 if (*tmpfname)
378 unlink(tmpfname);
379 exit(1);
380 }
381 *oldfname = '\0';
382 }
383 if (*tmpfname != '\0') {
384 if (outfile != NULL && outfile != stdout)
385 if (fclose(outfile) != 0) {
386 warn("fclose()");
387 unlink(tmpfname);
388 exit(1);
389 }
390 outfile = NULL;
391 if (rename(tmpfname, fname) != 0) {
392 /* this should not happen really! */
393 warn("rename()");
394 unlink(tmpfname);
395 exit(1);
396 }
397 *tmpfname = '\0';
398 }
399 outfname = NULL;
400 }
401 if (firstfile == 0)
402 files = files->next;
403 else
404 firstfile = 0;
405 if (files == NULL) {
406 sp->len = 0;
407 return (0);
408 }
409 fname = files->fname;
410 if (inplace != NULL) {
411 if (lstat(fname, &sb) != 0)
412 err(1, "%s", fname);
413 if (!(sb.st_mode & S_IFREG))
414 errx(1, "%s: %s %s", fname,
415 "in-place editing only",
416 "works for regular files");
417 if (*inplace != '\0') {
418 strlcpy(oldfname, fname,
419 sizeof(oldfname));
420 len = strlcat(oldfname, inplace,
421 sizeof(oldfname));
422 if (len > sizeof(oldfname))
423 errx(1, "%s: name too long", fname);
424 }
425 char d_name[PATH_MAX], f_name[PATH_MAX];
426 (void)strlcpy(d_name, fname, sizeof(d_name));
427 (void)strlcpy(f_name, fname, sizeof(f_name));
428 len = (size_t)snprintf(tmpfname, sizeof(tmpfname),
429 "%s/.!%ld!%s", dirname(d_name), (long)getpid(),
430 basename(f_name));
431 if (len >= sizeof(tmpfname))
432 errx(1, "%s: name too long", fname);
433 unlink(tmpfname);
434 if (outfile != NULL && outfile != stdout)
435 fclose(outfile);
436 if ((outfile = fopen(tmpfname, "w")) == NULL)
437 err(1, "%s", fname);
438 fchown(fileno(outfile), sb.st_uid, sb.st_gid);
439 fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
440 outfname = tmpfname;
441 if (!ispan) {
442 linenum = 0;
443 resetstate();
444 }
445 } else {
446 outfile = stdout;
447 outfname = "stdout";
448 }
449 if ((infile = fopen(fname, "r")) == NULL) {
450 warn("%s", fname);
451 rval = 1;
452 continue;
453 }
454 }
455 /*
456 * We are here only when infile is open and we still have something
457 * to read from it.
458 *
459 * Use getline() so that we can handle essentially infinite input
460 * data. The p and plen are static so each invocation gives
461 * getline() the same buffer which is expanded as needed.
462 */
463 ssize_t slen = getline(&p, &plen, infile);
464 if (slen == -1)
465 err(1, "%s", fname);
466 if (slen != 0 && p[slen - 1] == '\n')
467 slen--;
468 cspace(sp, p, (size_t)slen, spflag);
469
470 linenum++;
471
472 return (1);
473 }
474
475 /*
476 * Add a compilation unit to the linked list
477 */
478 static void
add_compunit(enum e_cut type,char * s)479 add_compunit(enum e_cut type, char *s)
480 {
481 struct s_compunit *cu;
482
483 cu = xmalloc(sizeof(struct s_compunit));
484 cu->type = type;
485 cu->s = s;
486 cu->next = NULL;
487 *cu_nextp = cu;
488 cu_nextp = &cu->next;
489 }
490
491 /*
492 * Add a file to the linked list
493 */
494 static void
add_file(char * s)495 add_file(char *s)
496 {
497 struct s_flist *fp;
498
499 fp = xmalloc(sizeof(struct s_flist));
500 fp->next = NULL;
501 *fl_nextp = fp;
502 fp->fname = s;
503 fl_nextp = &fp->next;
504 }
505
506 int
lastline(void)507 lastline(void)
508 {
509 int ch;
510
511 if (files->next != NULL && (inplace == NULL || ispan))
512 return (0);
513 if ((ch = getc(infile)) == EOF)
514 return (1);
515 ungetc(ch, infile);
516 return (0);
517 }
518