1/*-
2 * Copyright (c) 2013 Johann 'Myrkraverk' Oskarsson.
3 * Copyright (c) 1992 Diomidis Spinellis.
4 * Copyright (c) 1992, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Diomidis Spinellis of Imperial College, University of London.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD: stable/11/usr.bin/sed/main.c 362688 2020-06-27 14:31:33Z 0mp $");
37
38#ifndef lint
39static 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
45static 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#define _WITH_GETLINE
62#include <stdio.h>
63#include <stdlib.h>
64#include <string.h>
65#include <unistd.h>
66
67#include "defs.h"
68#include "extern.h"
69
70/*
71 * Linked list of units (strings and files) to be compiled
72 */
73struct s_compunit {
74	struct s_compunit *next;
75	enum e_cut {CU_FILE, CU_STRING} type;
76	char *s;			/* Pointer to string or fname */
77};
78
79/*
80 * Linked list pointer to compilation units and pointer to current
81 * next pointer.
82 */
83static struct s_compunit *script, **cu_nextp = &script;
84
85/*
86 * Linked list of files to be processed
87 */
88struct s_flist {
89	char *fname;
90	struct s_flist *next;
91};
92
93/*
94 * Linked list pointer to files and pointer to current
95 * next pointer.
96 */
97static struct s_flist *files, **fl_nextp = &files;
98
99FILE *infile;			/* Current input file */
100FILE *outfile;			/* Current output file */
101
102int aflag, eflag, nflag;
103int rflags = 0;
104int quit = 0;
105static int rval;		/* Exit status */
106
107static int ispan;		/* Whether inplace editing spans across files */
108
109/*
110 * Current file and line number; line numbers restart across compilation
111 * units, but span across input files.  The latter is optional if editing
112 * in place.
113 */
114const char *fname;		/* File name. */
115const char *outfname;		/* Output file name */
116static char oldfname[PATH_MAX];	/* Old file name (for in-place editing) */
117static char tmpfname[PATH_MAX];	/* Temporary file name (for in-place editing) */
118const char *inplace;		/* Inplace edit file extension. */
119u_long linenum;
120
121static void add_compunit(enum e_cut, char *);
122static void add_file(char *);
123static void usage(void);
124
125int
126main(int argc, char *argv[])
127{
128	int c, fflag, fflagstdin;
129	char *temp_arg;
130
131	(void) setlocale(LC_ALL, "");
132
133	fflag = 0;
134	fflagstdin = 0;
135	inplace = NULL;
136
137	while ((c = getopt(argc, argv, "EI:ae:f:i:lnru")) != -1)
138		switch (c) {
139		case 'r':		/* Gnu sed compat */
140		case 'E':
141			rflags = REG_EXTENDED;
142			break;
143		case 'I':
144			inplace = optarg;
145			ispan = 1;	/* span across input files */
146			break;
147		case 'a':
148			aflag = 1;
149			break;
150		case 'e':
151			eflag = 1;
152			if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL)
153				err(1, "malloc");
154			strcpy(temp_arg, optarg);
155			strcat(temp_arg, "\n");
156			add_compunit(CU_STRING, temp_arg);
157			break;
158		case 'f':
159			fflag = 1;
160			if (strcmp(optarg, "-") == 0)
161				fflagstdin = 1;
162			add_compunit(CU_FILE, optarg);
163			break;
164		case 'i':
165			inplace = optarg;
166			ispan = 0;	/* don't span across input files */
167			break;
168		case 'l':
169			if(setvbuf(stdout, NULL, _IOLBF, 0) != 0)
170				warnx("setting line buffered output failed");
171			break;
172		case 'n':
173			nflag = 1;
174			break;
175		case 'u':
176			if(setvbuf(stdout, NULL, _IONBF, 0) != 0)
177				warnx("setting unbuffered output failed");
178			break;
179		default:
180		case '?':
181			usage();
182		}
183	argc -= optind;
184	argv += optind;
185
186	/* First usage case; script is the first arg */
187	if (!eflag && !fflag && *argv) {
188		add_compunit(CU_STRING, *argv);
189		argv++;
190	}
191
192	compile();
193
194	/* Continue with first and start second usage */
195	if (*argv)
196		for (; *argv; argv++)
197			add_file(*argv);
198	else if (fflagstdin)
199		exit(rval);
200	else
201		add_file(NULL);
202	process();
203	cfclose(prog, NULL);
204	if (fclose(stdout))
205		err(1, "stdout");
206	exit(rval);
207}
208
209static void
210usage(void)
211{
212	(void)fprintf(stderr,
213	    "usage: %s script [-Ealnru] [-i extension] [file ...]\n"
214	    "\t%s [-Ealnu] [-i extension] [-e script] ... [-f script_file]"
215	    " ... [file ...]\n", getprogname(), getprogname());
216	exit(1);
217}
218
219/*
220 * Like fgets, but go through the chain of compilation units chaining them
221 * together.  Empty strings and files are ignored.
222 */
223char *
224cu_fgets(char *buf, int n, int *more)
225{
226	static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
227	static FILE *f;		/* Current open file */
228	static char *s;		/* Current pointer inside string */
229	static char string_ident[30];
230	char *p;
231
232again:
233	switch (state) {
234	case ST_EOF:
235		if (script == NULL) {
236			if (more != NULL)
237				*more = 0;
238			return (NULL);
239		}
240		linenum = 0;
241		switch (script->type) {
242		case CU_FILE:
243			if (strcmp(script->s, "-") == 0) {
244				f = stdin;
245				fname = "stdin";
246			} else {
247				if ((f = fopen(script->s, "r")) == NULL)
248				        err(1, "%s", script->s);
249				fname = script->s;
250			}
251			state = ST_FILE;
252			goto again;
253		case CU_STRING:
254			if (((size_t)snprintf(string_ident,
255			    sizeof(string_ident), "\"%s\"", script->s)) >=
256			    sizeof(string_ident) - 1)
257				(void)strcpy(string_ident +
258				    sizeof(string_ident) - 6, " ...\"");
259			fname = string_ident;
260			s = script->s;
261			state = ST_STRING;
262			goto again;
263		}
264	case ST_FILE:
265		if ((p = fgets(buf, n, f)) != NULL) {
266			linenum++;
267			if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
268				nflag = 1;
269			if (more != NULL)
270				*more = !feof(f);
271			return (p);
272		}
273		script = script->next;
274		(void)fclose(f);
275		state = ST_EOF;
276		goto again;
277	case ST_STRING:
278		if (linenum == 0 && s[0] == '#' && s[1] == 'n')
279			nflag = 1;
280		p = buf;
281		for (;;) {
282			if (n-- <= 1) {
283				*p = '\0';
284				linenum++;
285				if (more != NULL)
286					*more = 1;
287				return (buf);
288			}
289			switch (*s) {
290			case '\0':
291				state = ST_EOF;
292				if (s == script->s) {
293					script = script->next;
294					goto again;
295				} else {
296					script = script->next;
297					*p = '\0';
298					linenum++;
299					if (more != NULL)
300						*more = 0;
301					return (buf);
302				}
303			case '\n':
304				*p++ = '\n';
305				*p = '\0';
306				s++;
307				linenum++;
308				if (more != NULL)
309					*more = 0;
310				return (buf);
311			default:
312				*p++ = *s++;
313			}
314		}
315	}
316	/* NOTREACHED */
317	return (NULL);
318}
319
320/*
321 * Like fgets, but go through the list of files chaining them together.
322 * Set len to the length of the line.
323 */
324int
325mf_fgets(SPACE *sp, enum e_spflag spflag)
326{
327	struct stat sb;
328	ssize_t len;
329	static char *p = NULL;
330	static size_t plen = 0;
331	int c;
332	static int firstfile;
333
334	if (infile == NULL) {
335		/* stdin? */
336		if (files->fname == NULL) {
337			if (inplace != NULL)
338				errx(1, "-I or -i may not be used with stdin");
339			infile = stdin;
340			fname = "stdin";
341			outfile = stdout;
342			outfname = "stdout";
343		}
344		firstfile = 1;
345	}
346
347	for (;;) {
348		if (infile != NULL && (c = getc(infile)) != EOF && !quit) {
349			(void)ungetc(c, infile);
350			break;
351		}
352		/* If we are here then either eof or no files are open yet */
353		if (infile == stdin) {
354			sp->len = 0;
355			return (0);
356		}
357		if (infile != NULL) {
358			fclose(infile);
359			if (*oldfname != '\0') {
360				/* if there was a backup file, remove it */
361				unlink(oldfname);
362				/*
363				 * Backup the original.  Note that hard links
364				 * are not supported on all filesystems.
365				 */
366				if ((link(fname, oldfname) != 0) &&
367				   (rename(fname, oldfname) != 0)) {
368					warn("rename()");
369					if (*tmpfname)
370						unlink(tmpfname);
371					exit(1);
372				}
373				*oldfname = '\0';
374			}
375			if (*tmpfname != '\0') {
376				if (outfile != NULL && outfile != stdout)
377					if (fclose(outfile) != 0) {
378						warn("fclose()");
379						unlink(tmpfname);
380						exit(1);
381					}
382				outfile = NULL;
383				if (rename(tmpfname, fname) != 0) {
384					/* this should not happen really! */
385					warn("rename()");
386					unlink(tmpfname);
387					exit(1);
388				}
389				*tmpfname = '\0';
390			}
391			outfname = NULL;
392		}
393		if (firstfile == 0)
394			files = files->next;
395		else
396			firstfile = 0;
397		if (files == NULL) {
398			sp->len = 0;
399			return (0);
400		}
401		fname = files->fname;
402		if (inplace != NULL) {
403			if (lstat(fname, &sb) != 0)
404				err(1, "%s", fname);
405			if (!S_ISREG(sb.st_mode))
406				errx(1, "%s: %s %s", fname,
407				    "in-place editing only",
408				    "works for regular files");
409			if (*inplace != '\0') {
410				strlcpy(oldfname, fname,
411				    sizeof(oldfname));
412				len = strlcat(oldfname, inplace,
413				    sizeof(oldfname));
414				if (len > (ssize_t)sizeof(oldfname))
415					errx(1, "%s: name too long", fname);
416			}
417			len = snprintf(tmpfname, sizeof(tmpfname),
418			    "%s/.!%ld!%s", dirname(fname), (long)getpid(),
419			    basename(fname));
420			if (len >= (ssize_t)sizeof(tmpfname))
421				errx(1, "%s: name too long", fname);
422			unlink(tmpfname);
423			if (outfile != NULL && outfile != stdout)
424				fclose(outfile);
425			if ((outfile = fopen(tmpfname, "w")) == NULL)
426				err(1, "%s", fname);
427			fchown(fileno(outfile), sb.st_uid, sb.st_gid);
428			fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
429			outfname = tmpfname;
430			if (!ispan) {
431				linenum = 0;
432				resetstate();
433			}
434		} else {
435			outfile = stdout;
436			outfname = "stdout";
437		}
438		if ((infile = fopen(fname, "r")) == NULL) {
439			warn("%s", fname);
440			rval = 1;
441			continue;
442		}
443	}
444	/*
445	 * We are here only when infile is open and we still have something
446	 * to read from it.
447	 *
448	 * Use getline() so that we can handle essentially infinite input
449	 * data.  The p and plen are static so each invocation gives
450	 * getline() the same buffer which is expanded as needed.
451	 */
452	len = getline(&p, &plen, infile);
453	if (len == -1)
454		err(1, "%s", fname);
455	if (len != 0 && p[len - 1] == '\n') {
456		sp->append_newline = 1;
457		len--;
458	} else if (!lastline()) {
459		sp->append_newline = 1;
460	} else {
461		sp->append_newline = 0;
462	}
463	cspace(sp, p, len, spflag);
464
465	linenum++;
466
467	return (1);
468}
469
470/*
471 * Add a compilation unit to the linked list
472 */
473static void
474add_compunit(enum e_cut type, char *s)
475{
476	struct s_compunit *cu;
477
478	if ((cu = malloc(sizeof(struct s_compunit))) == NULL)
479		err(1, "malloc");
480	cu->type = type;
481	cu->s = s;
482	cu->next = NULL;
483	*cu_nextp = cu;
484	cu_nextp = &cu->next;
485}
486
487/*
488 * Add a file to the linked list
489 */
490static void
491add_file(char *s)
492{
493	struct s_flist *fp;
494
495	if ((fp = malloc(sizeof(struct s_flist))) == NULL)
496		err(1, "malloc");
497	fp->next = NULL;
498	*fl_nextp = fp;
499	fp->fname = s;
500	fl_nextp = &fp->next;
501}
502
503static int
504next_files_have_lines(void)
505{
506	struct s_flist *file;
507	FILE *file_fd;
508	int ch;
509
510	file = files;
511	while ((file = file->next) != NULL) {
512		if ((file_fd = fopen(file->fname, "r")) == NULL)
513			continue;
514
515		if ((ch = getc(file_fd)) != EOF) {
516			/*
517			 * This next file has content, therefore current
518			 * file doesn't contains the last line.
519			 */
520			ungetc(ch, file_fd);
521			fclose(file_fd);
522			return (1);
523		}
524
525		fclose(file_fd);
526	}
527
528	return (0);
529}
530
531int
532lastline(void)
533{
534	int ch;
535
536	if (feof(infile)) {
537		return !(
538		    (inplace == NULL || ispan) &&
539		    next_files_have_lines());
540	}
541	if ((ch = getc(infile)) == EOF) {
542		return !(
543		    (inplace == NULL || ispan) &&
544		    next_files_have_lines());
545	}
546	ungetc(ch, infile);
547	return (0);
548}
549