main.c revision 1.34 
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
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) __dead;
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::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
222static void
223usage(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 */
236char *
237cu_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
245again:
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 */
332int
333mf_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 */
478static void
479add_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 */
494static void
495add_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
506int
507lastline(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