main.c revision 1.23 
1/*	$NetBSD: main.c,v 1.23 2014/06/06 01:45:11 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 1.23 2014/06/06 01:45:11 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#ifndef lint
53static 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 */
81struct 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 */
91static struct s_compunit *script, **cu_nextp = &script;
92
93/*
94 * Linked list of files to be processed
95 */
96struct 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 */
105static struct s_flist *files, **fl_nextp = &files;
106
107FILE *infile;			/* Current input file */
108FILE *outfile;			/* Current output file */
109
110int aflag, eflag, nflag;
111int rflags = 0;
112static int rval;		/* Exit status */
113
114static 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 */
121const char *fname;		/* File name. */
122const char *outfname;		/* Output file name */
123static char oldfname[PATH_MAX];	/* Old file name (for in-place editing) */
124static char tmpfname[PATH_MAX];	/* Temporary file name (for in-place editing) */
125static const char *inplace;	/* Inplace edit file extension. */
126u_long linenum;
127
128static void add_compunit(enum e_cut, char *);
129static void add_file(char *);
130static void usage(void);
131
132int
133main(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::lnr")) != -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		default:
185		case '?':
186			usage();
187		}
188	argc -= optind;
189	argv += optind;
190
191	/* First usage case; script is the first arg */
192	if (!eflag && !fflag && *argv) {
193		add_compunit(CU_STRING, *argv);
194		argv++;
195	}
196
197	compile();
198
199	/* Continue with first and start second usage */
200	if (*argv)
201		for (; *argv; argv++)
202			add_file(*argv);
203	else
204		add_file(NULL);
205	process();
206	cfclose(prog, NULL);
207	if (fclose(stdout))
208		err(1, "stdout");
209	exit(rval);
210}
211
212static void
213usage(void)
214{
215	(void)fprintf(stderr, "%s\n%s\n",
216		"usage: sed script [-Ealn] [-i extension] [file ...]",
217		"       sed [-Ealn] [-i extension] [-e script] ... [-f script_file] ... [file ...]");
218	exit(1);
219}
220
221/*
222 * Like fgets, but go through the chain of compilation units chaining them
223 * together.  Empty strings and files are ignored.
224 */
225char *
226cu_fgets(char *buf, int n, int *more)
227{
228	static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
229	static FILE *f;		/* Current open file */
230	static char *s;		/* Current pointer inside string */
231	static char string_ident[30];
232	char *p;
233
234again:
235	switch (state) {
236	case ST_EOF:
237		if (script == NULL) {
238			if (more != NULL)
239				*more = 0;
240			return (NULL);
241		}
242		linenum = 0;
243		switch (script->type) {
244		case CU_FILE:
245			if ((f = fopen(script->s, "r")) == NULL)
246				err(1, "%s", script->s);
247			fname = script->s;
248			state = ST_FILE;
249			goto again;
250		case CU_STRING:
251			if (((size_t)snprintf(string_ident,
252			    sizeof(string_ident), "\"%s\"", script->s)) >=
253			    sizeof(string_ident) - 1)
254				(void)strcpy(string_ident +
255				    sizeof(string_ident) - 6, " ...\"");
256			fname = string_ident;
257			s = script->s;
258			state = ST_STRING;
259			goto again;
260		}
261	case ST_FILE:
262		if ((p = fgets(buf, n, f)) != NULL) {
263			linenum++;
264			if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
265				nflag = 1;
266			if (more != NULL)
267				*more = !feof(f);
268			return (p);
269		}
270		script = script->next;
271		(void)fclose(f);
272		state = ST_EOF;
273		goto again;
274	case ST_STRING:
275		if (linenum == 0 && s[0] == '#' && s[1] == 'n')
276			nflag = 1;
277		p = buf;
278		for (;;) {
279			if (n-- <= 1) {
280				*p = '\0';
281				linenum++;
282				if (more != NULL)
283					*more = 1;
284				return (buf);
285			}
286			switch (*s) {
287			case '\0':
288				state = ST_EOF;
289				if (s == script->s) {
290					script = script->next;
291					goto again;
292				} else {
293					script = script->next;
294					*p = '\0';
295					linenum++;
296					if (more != NULL)
297						*more = 0;
298					return (buf);
299				}
300			case '\n':
301				*p++ = '\n';
302				*p = '\0';
303				s++;
304				linenum++;
305				if (more != NULL)
306					*more = 0;
307				return (buf);
308			default:
309				*p++ = *s++;
310			}
311		}
312	}
313	/* NOTREACHED */
314	return (NULL);
315}
316
317/*
318 * Like fgets, but go through the list of files chaining them together.
319 * Set len to the length of the line.
320 */
321int
322mf_fgets(SPACE *sp, enum e_spflag spflag)
323{
324	struct stat sb;
325	size_t len;
326	static char *p = NULL;
327	static size_t plen = 0;
328	int c;
329	static int firstfile;
330
331	if (infile == NULL) {
332		/* stdin? */
333		if (files->fname == NULL) {
334			if (inplace != NULL)
335				errx(1, "-I or -i may not be used with stdin");
336			infile = stdin;
337			fname = "stdin";
338			outfile = stdout;
339			outfname = "stdout";
340		}
341		firstfile = 1;
342	}
343
344	for (;;) {
345		if (infile != NULL && (c = getc(infile)) != EOF) {
346			(void)ungetc(c, infile);
347			break;
348		}
349		/* If we are here then either eof or no files are open yet */
350		if (infile == stdin) {
351			sp->len = 0;
352			return (0);
353		}
354		if (infile != NULL) {
355			fclose(infile);
356			if (*oldfname != '\0') {
357				/* if there was a backup file, remove it */
358				unlink(oldfname);
359				/*
360				 * Backup the original.  Note that hard links
361				 * are not supported on all filesystems.
362				 */
363				if ((link(fname, oldfname) != 0) &&
364				   (rename(fname, oldfname) != 0)) {
365					warn("rename()");
366					if (*tmpfname)
367						unlink(tmpfname);
368					exit(1);
369				}
370				*oldfname = '\0';
371			}
372			if (*tmpfname != '\0') {
373				if (outfile != NULL && outfile != stdout)
374					if (fclose(outfile) != 0) {
375						warn("fclose()");
376						unlink(tmpfname);
377						exit(1);
378					}
379				outfile = NULL;
380				if (rename(tmpfname, fname) != 0) {
381					/* this should not happen really! */
382					warn("rename()");
383					unlink(tmpfname);
384					exit(1);
385				}
386				*tmpfname = '\0';
387			}
388			outfname = NULL;
389		}
390		if (firstfile == 0)
391			files = files->next;
392		else
393			firstfile = 0;
394		if (files == NULL) {
395			sp->len = 0;
396			return (0);
397		}
398		fname = files->fname;
399		if (inplace != NULL) {
400			if (lstat(fname, &sb) != 0)
401				err(1, "%s", fname);
402			if (!(sb.st_mode & S_IFREG))
403				errx(1, "%s: %s %s", fname,
404				    "in-place editing only",
405				    "works for regular files");
406			if (*inplace != '\0') {
407				strlcpy(oldfname, fname,
408				    sizeof(oldfname));
409				len = strlcat(oldfname, inplace,
410				    sizeof(oldfname));
411				if (len > sizeof(oldfname))
412					errx(1, "%s: name too long", fname);
413			}
414			char d_name[PATH_MAX], f_name[PATH_MAX];
415			(void)strlcpy(d_name, fname, sizeof(d_name));
416			(void)strlcpy(f_name, fname, sizeof(f_name));
417			len = (size_t)snprintf(tmpfname, sizeof(tmpfname),
418			    "%s/.!%ld!%s", dirname(d_name), (long)getpid(),
419			    basename(f_name));
420			if (len >= sizeof(tmpfname))
421				errx(1, "%s: name too long", fname);
422			unlink(tmpfname);
423			if ((outfile = fopen(tmpfname, "w")) == NULL)
424				err(1, "%s", fname);
425			fchown(fileno(outfile), sb.st_uid, sb.st_gid);
426			fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
427			outfname = tmpfname;
428			if (!ispan) {
429				linenum = 0;
430				resetstate();
431			}
432		} else {
433			outfile = stdout;
434			outfname = "stdout";
435		}
436		if ((infile = fopen(fname, "r")) == NULL) {
437			warn("%s", fname);
438			rval = 1;
439			continue;
440		}
441	}
442	/*
443	 * We are here only when infile is open and we still have something
444	 * to read from it.
445	 *
446	 * Use getline() so that we can handle essentially infinite input
447	 * data.  The p and plen are static so each invocation gives
448	 * getline() the same buffer which is expanded as needed.
449	 */
450	ssize_t slen = getline(&p, &plen, infile);
451	if (slen == -1)
452		err(1, "%s", fname);
453	if (slen != 0 && p[slen - 1] == '\n')
454		slen--;
455	cspace(sp, p, (size_t)slen, spflag);
456
457	linenum++;
458
459	return (1);
460}
461
462/*
463 * Add a compilation unit to the linked list
464 */
465static void
466add_compunit(enum e_cut type, char *s)
467{
468	struct s_compunit *cu;
469
470	cu = xmalloc(sizeof(struct s_compunit));
471	cu->type = type;
472	cu->s = s;
473	cu->next = NULL;
474	*cu_nextp = cu;
475	cu_nextp = &cu->next;
476}
477
478/*
479 * Add a file to the linked list
480 */
481static void
482add_file(char *s)
483{
484	struct s_flist *fp;
485
486	fp = xmalloc(sizeof(struct s_flist));
487	fp->next = NULL;
488	*fl_nextp = fp;
489	fp->fname = s;
490	fl_nextp = &fp->next;
491}
492
493int
494lastline(void)
495{
496	int ch;
497
498	if (files->next != NULL && (inplace == NULL || ispan))
499		return (0);
500	if ((ch = getc(infile)) == EOF)
501		return (1);
502	ungetc(ch, infile);
503	return (0);
504}
505