main.c revision 1.22 
1/*	$NetBSD: main.c,v 1.22 2014/06/06 00:13:13 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 1.22 2014/06/06 00:13:13 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			if(setlinebuf(stdout) != 0)
174				warnx("setlinebuf() failed");
175			break;
176		case 'n':
177			nflag = 1;
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
199		add_file(NULL);
200	process();
201	cfclose(prog, NULL);
202	if (fclose(stdout))
203		err(1, "stdout");
204	exit(rval);
205}
206
207static void
208usage(void)
209{
210	(void)fprintf(stderr, "%s\n%s\n",
211		"usage: sed script [-Ealn] [-i extension] [file ...]",
212		"       sed [-Ealn] [-i extension] [-e script] ... [-f script_file] ... [file ...]");
213	exit(1);
214}
215
216/*
217 * Like fgets, but go through the chain of compilation units chaining them
218 * together.  Empty strings and files are ignored.
219 */
220char *
221cu_fgets(char *buf, int n, int *more)
222{
223	static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
224	static FILE *f;		/* Current open file */
225	static char *s;		/* Current pointer inside string */
226	static char string_ident[30];
227	char *p;
228
229again:
230	switch (state) {
231	case ST_EOF:
232		if (script == NULL) {
233			if (more != NULL)
234				*more = 0;
235			return (NULL);
236		}
237		linenum = 0;
238		switch (script->type) {
239		case CU_FILE:
240			if ((f = fopen(script->s, "r")) == NULL)
241				err(1, "%s", script->s);
242			fname = script->s;
243			state = ST_FILE;
244			goto again;
245		case CU_STRING:
246			if (((size_t)snprintf(string_ident,
247			    sizeof(string_ident), "\"%s\"", script->s)) >=
248			    sizeof(string_ident) - 1)
249				(void)strcpy(string_ident +
250				    sizeof(string_ident) - 6, " ...\"");
251			fname = string_ident;
252			s = script->s;
253			state = ST_STRING;
254			goto again;
255		}
256	case ST_FILE:
257		if ((p = fgets(buf, n, f)) != NULL) {
258			linenum++;
259			if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
260				nflag = 1;
261			if (more != NULL)
262				*more = !feof(f);
263			return (p);
264		}
265		script = script->next;
266		(void)fclose(f);
267		state = ST_EOF;
268		goto again;
269	case ST_STRING:
270		if (linenum == 0 && s[0] == '#' && s[1] == 'n')
271			nflag = 1;
272		p = buf;
273		for (;;) {
274			if (n-- <= 1) {
275				*p = '\0';
276				linenum++;
277				if (more != NULL)
278					*more = 1;
279				return (buf);
280			}
281			switch (*s) {
282			case '\0':
283				state = ST_EOF;
284				if (s == script->s) {
285					script = script->next;
286					goto again;
287				} else {
288					script = script->next;
289					*p = '\0';
290					linenum++;
291					if (more != NULL)
292						*more = 0;
293					return (buf);
294				}
295			case '\n':
296				*p++ = '\n';
297				*p = '\0';
298				s++;
299				linenum++;
300				if (more != NULL)
301					*more = 0;
302				return (buf);
303			default:
304				*p++ = *s++;
305			}
306		}
307	}
308	/* NOTREACHED */
309	return (NULL);
310}
311
312/*
313 * Like fgets, but go through the list of files chaining them together.
314 * Set len to the length of the line.
315 */
316int
317mf_fgets(SPACE *sp, enum e_spflag spflag)
318{
319	struct stat sb;
320	size_t len;
321	static char *p = NULL;
322	static size_t plen = 0;
323	int c;
324	static int firstfile;
325
326	if (infile == NULL) {
327		/* stdin? */
328		if (files->fname == NULL) {
329			if (inplace != NULL)
330				errx(1, "-I or -i may not be used with stdin");
331			infile = stdin;
332			fname = "stdin";
333			outfile = stdout;
334			outfname = "stdout";
335		}
336		firstfile = 1;
337	}
338
339	for (;;) {
340		if (infile != NULL && (c = getc(infile)) != EOF) {
341			(void)ungetc(c, infile);
342			break;
343		}
344		/* If we are here then either eof or no files are open yet */
345		if (infile == stdin) {
346			sp->len = 0;
347			return (0);
348		}
349		if (infile != NULL) {
350			fclose(infile);
351			if (*oldfname != '\0') {
352				/* if there was a backup file, remove it */
353				unlink(oldfname);
354				/*
355				 * Backup the original.  Note that hard links
356				 * are not supported on all filesystems.
357				 */
358				if ((link(fname, oldfname) != 0) &&
359				   (rename(fname, oldfname) != 0)) {
360					warn("rename()");
361					if (*tmpfname)
362						unlink(tmpfname);
363					exit(1);
364				}
365				*oldfname = '\0';
366			}
367			if (*tmpfname != '\0') {
368				if (outfile != NULL && outfile != stdout)
369					if (fclose(outfile) != 0) {
370						warn("fclose()");
371						unlink(tmpfname);
372						exit(1);
373					}
374				outfile = NULL;
375				if (rename(tmpfname, fname) != 0) {
376					/* this should not happen really! */
377					warn("rename()");
378					unlink(tmpfname);
379					exit(1);
380				}
381				*tmpfname = '\0';
382			}
383			outfname = NULL;
384		}
385		if (firstfile == 0)
386			files = files->next;
387		else
388			firstfile = 0;
389		if (files == NULL) {
390			sp->len = 0;
391			return (0);
392		}
393		fname = files->fname;
394		if (inplace != NULL) {
395			if (lstat(fname, &sb) != 0)
396				err(1, "%s", fname);
397			if (!(sb.st_mode & S_IFREG))
398				errx(1, "%s: %s %s", fname,
399				    "in-place editing only",
400				    "works for regular files");
401			if (*inplace != '\0') {
402				strlcpy(oldfname, fname,
403				    sizeof(oldfname));
404				len = strlcat(oldfname, inplace,
405				    sizeof(oldfname));
406				if (len > sizeof(oldfname))
407					errx(1, "%s: name too long", fname);
408			}
409			char d_name[PATH_MAX], f_name[PATH_MAX];
410			(void)strlcpy(d_name, fname, sizeof(d_name));
411			(void)strlcpy(f_name, fname, sizeof(f_name));
412			len = (size_t)snprintf(tmpfname, sizeof(tmpfname),
413			    "%s/.!%ld!%s", dirname(d_name), (long)getpid(),
414			    basename(f_name));
415			if (len >= sizeof(tmpfname))
416				errx(1, "%s: name too long", fname);
417			unlink(tmpfname);
418			if ((outfile = fopen(tmpfname, "w")) == NULL)
419				err(1, "%s", fname);
420			fchown(fileno(outfile), sb.st_uid, sb.st_gid);
421			fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
422			outfname = tmpfname;
423			if (!ispan) {
424				linenum = 0;
425				resetstate();
426			}
427		} else {
428			outfile = stdout;
429			outfname = "stdout";
430		}
431		if ((infile = fopen(fname, "r")) == NULL) {
432			warn("%s", fname);
433			rval = 1;
434			continue;
435		}
436	}
437	/*
438	 * We are here only when infile is open and we still have something
439	 * to read from it.
440	 *
441	 * Use getline() so that we can handle essentially infinite input
442	 * data.  The p and plen are static so each invocation gives
443	 * getline() the same buffer which is expanded as needed.
444	 */
445	ssize_t slen = getline(&p, &plen, infile);
446	if (slen == -1)
447		err(1, "%s", fname);
448	if (slen != 0 && p[slen - 1] == '\n')
449		slen--;
450	cspace(sp, p, (size_t)slen, spflag);
451
452	linenum++;
453
454	return (1);
455}
456
457/*
458 * Add a compilation unit to the linked list
459 */
460static void
461add_compunit(enum e_cut type, char *s)
462{
463	struct s_compunit *cu;
464
465	cu = xmalloc(sizeof(struct s_compunit));
466	cu->type = type;
467	cu->s = s;
468	cu->next = NULL;
469	*cu_nextp = cu;
470	cu_nextp = &cu->next;
471}
472
473/*
474 * Add a file to the linked list
475 */
476static void
477add_file(char *s)
478{
479	struct s_flist *fp;
480
481	fp = xmalloc(sizeof(struct s_flist));
482	fp->next = NULL;
483	*fl_nextp = fp;
484	fp->fname = s;
485	fl_nextp = &fp->next;
486}
487
488int
489lastline(void)
490{
491	int ch;
492
493	if (files->next != NULL && (inplace == NULL || ispan))
494		return (0);
495	if ((ch = getc(infile)) == EOF)
496		return (1);
497	ungetc(ch, infile);
498	return (0);
499}
500