1/*-
2 * Copyright (c) 1992 Diomidis Spinellis.
3 * Copyright (c) 1992, 1993
4 *	The Regents of the University of California.  All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Diomidis Spinellis of Imperial College, University of London.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD: src/usr.bin/sed/main.c,v 1.36 2005/05/10 13:40:50 glebius Exp $");
36
37#ifndef lint
38static const char copyright[] =
39"@(#) Copyright (c) 1992, 1993\n\
40	The Regents of the University of California.  All rights reserved.\n";
41#endif
42
43#ifndef lint
44static const char sccsid[] = "@(#)main.c	8.2 (Berkeley) 1/3/94";
45#endif
46
47#include <sys/types.h>
48#include <sys/mman.h>
49#include <sys/param.h>
50#include <sys/stat.h>
51
52#include <err.h>
53#include <errno.h>
54#include <fcntl.h>
55#include <libgen.h>
56#include <limits.h>
57#include <locale.h>
58#include <regex.h>
59#include <stddef.h>
60#include <stdio.h>
61#include <stdlib.h>
62#include <string.h>
63#include <unistd.h>
64
65#include "defs.h"
66#include "extern.h"
67
68/*
69 * Linked list of units (strings and files) to be compiled
70 */
71struct s_compunit {
72	struct s_compunit *next;
73	enum e_cut {CU_FILE, CU_STRING} type;
74	char *s;			/* Pointer to string or fname */
75};
76
77/*
78 * Linked list pointer to compilation units and pointer to current
79 * next pointer.
80 */
81static struct s_compunit *script, **cu_nextp = &script;
82
83/*
84 * Linked list of files to be processed
85 */
86struct s_flist {
87	char *fname;
88	struct s_flist *next;
89};
90
91/*
92 * Linked list pointer to files and pointer to current
93 * next pointer.
94 */
95static struct s_flist *files, **fl_nextp = &files;
96
97FILE *infile;			/* Current input file */
98FILE *outfile;			/* Current output file */
99
100int aflag, eflag, nflag;
101int rflags = 0;
102static int rval;		/* Exit status */
103
104/*
105 * Current file and line number; line numbers restart across compilation
106 * units, but span across input files.
107 */
108const char *fname;		/* File name. */
109const char *outfname;		/* Output file name */
110static char oldfname[PATH_MAX];	/* Old file name (for in-place editing) */
111static char tmpfname[PATH_MAX];	/* Temporary file name (for in-place editing) */
112const char *inplace;		/* Inplace edit file extension. */
113u_long linenum;
114
115static void add_compunit(enum e_cut, char *);
116static void add_file(char *);
117static int inplace_edit(char **);
118static void usage(void);
119
120int
121main(int argc, char *argv[])
122{
123	int c, fflag;
124	char *temp_arg;
125
126	(void) setlocale(LC_ALL, "");
127
128	fflag = 0;
129	inplace = NULL;
130
131	while ((c = getopt(argc, argv, "Eae:f:i:ln")) != -1)
132		switch (c) {
133		case 'E':
134			rflags = REG_EXTENDED;
135			break;
136		case 'a':
137			aflag = 1;
138			break;
139		case 'e':
140			eflag = 1;
141			if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL)
142				err(1, "malloc");
143			strcpy(temp_arg, optarg);
144			strcat(temp_arg, "\n");
145			add_compunit(CU_STRING, temp_arg);
146			break;
147		case 'f':
148			fflag = 1;
149			add_compunit(CU_FILE, optarg);
150			break;
151		case 'i':
152			inplace = optarg;
153			break;
154		case 'l':
155			if(setlinebuf(stdout) != 0)
156				warnx("setlinebuf() failed");
157			break;
158		case 'n':
159			nflag = 1;
160			break;
161		default:
162		case '?':
163			usage();
164		}
165	argc -= optind;
166	argv += optind;
167
168	/* First usage case; script is the first arg */
169	if (!eflag && !fflag && *argv) {
170		add_compunit(CU_STRING, *argv);
171		argv++;
172	}
173
174	compile();
175
176	/* Continue with first and start second usage */
177	if (*argv)
178		for (; *argv; argv++)
179			add_file(*argv);
180	else
181		add_file(NULL);
182	process();
183	cfclose(prog, NULL);
184	if (fclose(stdout))
185		err(1, "stdout");
186	exit(rval);
187}
188
189static void
190usage(void)
191{
192	(void)fprintf(stderr, "%s\n%s\n",
193		"usage: sed script [-Ealn] [-i extension] [file ...]",
194		"       sed [-Ealn] [-i extension] [-e script] ... [-f script_file] ... [file ...]");
195	exit(1);
196}
197
198/*
199 * Like fgets, but go through the chain of compilation units chaining them
200 * together.  Empty strings and files are ignored.
201 */
202char *
203cu_fgets(char *buf, int n, int *more)
204{
205	static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
206	static FILE *f;		/* Current open file */
207	static char *s;		/* Current pointer inside string */
208	static char string_ident[30];
209	char *p;
210
211again:
212	switch (state) {
213	case ST_EOF:
214		if (script == NULL) {
215			if (more != NULL)
216				*more = 0;
217			return (NULL);
218		}
219		linenum = 0;
220		switch (script->type) {
221		case CU_FILE:
222			if ((f = fopen(script->s, "r")) == NULL)
223				err(1, "%s", script->s);
224			fname = script->s;
225			state = ST_FILE;
226			goto again;
227		case CU_STRING:
228			if ((snprintf(string_ident,
229			    sizeof(string_ident), "\"%s\"", script->s)) >=
230			    sizeof(string_ident) - 1)
231				(void)strcpy(string_ident +
232				    sizeof(string_ident) - 6, " ...\"");
233			fname = string_ident;
234			s = script->s;
235			state = ST_STRING;
236			goto again;
237		}
238	case ST_FILE:
239		if ((p = fgets(buf, n, f)) != NULL) {
240			linenum++;
241			if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
242				nflag = 1;
243			if (more != NULL)
244				*more = !feof(f);
245			return (p);
246		}
247		script = script->next;
248		(void)fclose(f);
249		state = ST_EOF;
250		goto again;
251	case ST_STRING:
252		if (linenum == 0 && s[0] == '#' && s[1] == 'n')
253			nflag = 1;
254		p = buf;
255		for (;;) {
256			if (n-- <= 1) {
257				*p = '\0';
258				linenum++;
259				if (more != NULL)
260					*more = 1;
261				return (buf);
262			}
263			switch (*s) {
264			case '\0':
265				state = ST_EOF;
266				if (s == script->s) {
267					script = script->next;
268					goto again;
269				} else {
270					script = script->next;
271					*p = '\0';
272					linenum++;
273					if (more != NULL)
274						*more = 0;
275					return (buf);
276				}
277			case '\n':
278				*p++ = '\n';
279				*p = '\0';
280				s++;
281				linenum++;
282				if (more != NULL)
283					*more = 0;
284				return (buf);
285			default:
286				*p++ = *s++;
287			}
288		}
289	}
290	/* NOTREACHED */
291	return (NULL);
292}
293
294/*
295 * Like fgets, but go through the list of files chaining them together.
296 * Set len to the length of the line.
297 */
298int
299mf_fgets(SPACE *sp, enum e_spflag spflag)
300{
301	struct stat sb;
302	size_t len;
303	char *p;
304	int c;
305	static int firstfile;
306
307	if (infile == NULL) {
308		/* stdin? */
309		if (files->fname == NULL) {
310			if (inplace != NULL)
311				errx(1, "-i may not be used with stdin");
312			infile = stdin;
313			fname = "stdin";
314			outfile = stdout;
315			outfname = "stdout";
316		}
317		firstfile = 1;
318	}
319
320	for (;;) {
321		if (infile != NULL && (c = getc(infile)) != EOF) {
322			(void)ungetc(c, infile);
323			break;
324		}
325		/* If we are here then either eof or no files are open yet */
326		if (infile == stdin) {
327			sp->len = 0;
328			return (0);
329		}
330		if (infile != NULL) {
331			fclose(infile);
332			if (*oldfname != '\0') {
333				if (rename(fname, oldfname) != 0) {
334					warn("rename()");
335					unlink(tmpfname);
336					exit(1);
337				}
338				*oldfname = '\0';
339			}
340			if (*tmpfname != '\0') {
341				if (outfile != NULL && outfile != stdout)
342					fclose(outfile);
343				outfile = NULL;
344				rename(tmpfname, fname);
345				*tmpfname = '\0';
346			}
347			outfname = NULL;
348		}
349		if (firstfile == 0)
350			files = files->next;
351		else
352			firstfile = 0;
353		if (files == NULL) {
354			sp->len = 0;
355			return (0);
356		}
357		fname = files->fname;
358		if (inplace != NULL) {
359			if (lstat(fname, &sb) != 0)
360				err(1, "%s", fname);
361			if (!(sb.st_mode & S_IFREG))
362				errx(1, "%s: %s %s", fname,
363				    "in-place editing only",
364				    "works for regular files");
365			if (*inplace != '\0') {
366				strlcpy(oldfname, fname,
367				    sizeof(oldfname));
368				len = strlcat(oldfname, inplace,
369				    sizeof(oldfname));
370				if (len > sizeof(oldfname))
371					errx(1, "%s: name too long", fname);
372			}
373			len = snprintf(tmpfname, sizeof(tmpfname),
374			    "%s/.!%ld!%s", dirname(fname), (long)getpid(),
375			    basename(fname));
376			if (len >= sizeof(tmpfname))
377				errx(1, "%s: name too long", fname);
378			unlink(tmpfname);
379			if ((outfile = fopen(tmpfname, "w")) == NULL)
380				err(1, "%s", fname);
381			fchown(fileno(outfile), sb.st_uid, sb.st_gid);
382			fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
383			outfname = tmpfname;
384		} else {
385			outfile = stdout;
386			outfname = "stdout";
387		}
388		if ((infile = fopen(fname, "r")) == NULL) {
389			warn("%s", fname);
390			rval = 1;
391			continue;
392		}
393	}
394	/*
395	 * We are here only when infile is open and we still have something
396	 * to read from it.
397	 *
398	 * Use fgetln so that we can handle essentially infinite input data.
399	 * Can't use the pointer into the stdio buffer as the process space
400	 * because the ungetc() can cause it to move.
401	 */
402	p = fgetln(infile, &len);
403	if (ferror(infile))
404		errx(1, "%s: %s", fname, strerror(errno ? errno : EIO));
405	if (len != 0 && p[len - 1] == '\n')
406		len--;
407	cspace(sp, p, len, spflag);
408
409	linenum++;
410
411	return (1);
412}
413
414/*
415 * Add a compilation unit to the linked list
416 */
417static void
418add_compunit(enum e_cut type, char *s)
419{
420	struct s_compunit *cu;
421
422	if ((cu = malloc(sizeof(struct s_compunit))) == NULL)
423		err(1, "malloc");
424	cu->type = type;
425	cu->s = s;
426	cu->next = NULL;
427	*cu_nextp = cu;
428	cu_nextp = &cu->next;
429}
430
431/*
432 * Add a file to the linked list
433 */
434static void
435add_file(char *s)
436{
437	struct s_flist *fp;
438
439	if ((fp = malloc(sizeof(struct s_flist))) == NULL)
440		err(1, "malloc");
441	fp->next = NULL;
442	*fl_nextp = fp;
443	fp->fname = s;
444	fl_nextp = &fp->next;
445}
446
447int
448lastline(void)
449{
450	int ch;
451
452	if (files->next != NULL)
453		return (0);
454	if ((ch = getc(infile)) == EOF)
455		return (1);
456	ungetc(ch, infile);
457	return (0);
458}
459