main.c revision 277933 
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/10/usr.bin/sed/main.c 277933 2015-01-30 14:36:02Z pfg $");
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;
104static int rval;		/* Exit status */
105
106static int ispan;		/* Whether inplace editing spans across files */
107
108/*
109 * Current file and line number; line numbers restart across compilation
110 * units, but span across input files.  The latter is optional if editing
111 * in place.
112 */
113const char *fname;		/* File name. */
114const char *outfname;		/* Output file name */
115static char oldfname[PATH_MAX];	/* Old file name (for in-place editing) */
116static char tmpfname[PATH_MAX];	/* Temporary file name (for in-place editing) */
117static const char *inplace;	/* Inplace edit file extension. */
118u_long linenum;
119
120static void add_compunit(enum e_cut, char *);
121static void add_file(char *);
122static void usage(void);
123
124int
125main(int argc, char *argv[])
126{
127	int c, fflag;
128	char *temp_arg;
129
130	(void) setlocale(LC_ALL, "");
131
132	fflag = 0;
133	inplace = NULL;
134
135	while ((c = getopt(argc, argv, "EI:ae:f:i:lnru")) != -1)
136		switch (c) {
137		case 'r':		/* Gnu sed compat */
138		case 'E':
139			rflags = REG_EXTENDED;
140			break;
141		case 'I':
142			inplace = optarg;
143			ispan = 1;	/* span across input files */
144			break;
145		case 'a':
146			aflag = 1;
147			break;
148		case 'e':
149			eflag = 1;
150			if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL)
151				err(1, "malloc");
152			strcpy(temp_arg, optarg);
153			strcat(temp_arg, "\n");
154			add_compunit(CU_STRING, temp_arg);
155			break;
156		case 'f':
157			fflag = 1;
158			add_compunit(CU_FILE, optarg);
159			break;
160		case 'i':
161			inplace = optarg;
162			ispan = 0;	/* don't span across input files */
163			break;
164		case 'l':
165			if(setvbuf(stdout, NULL, _IOLBF, 0) != 0)
166				warnx("setting line buffered output failed");
167			break;
168		case 'n':
169			nflag = 1;
170			break;
171		case 'u':
172			if(setvbuf(stdout, NULL, _IONBF, 0) != 0)
173				warnx("setting unbuffered output failed");
174			break;
175		default:
176		case '?':
177			usage();
178		}
179	argc -= optind;
180	argv += optind;
181
182	/* First usage case; script is the first arg */
183	if (!eflag && !fflag && *argv) {
184		add_compunit(CU_STRING, *argv);
185		argv++;
186	}
187
188	compile();
189
190	/* Continue with first and start second usage */
191	if (*argv)
192		for (; *argv; argv++)
193			add_file(*argv);
194	else
195		add_file(NULL);
196	process();
197	cfclose(prog, NULL);
198	if (fclose(stdout))
199		err(1, "stdout");
200	exit(rval);
201}
202
203static void
204usage(void)
205{
206	(void)fprintf(stderr,
207	    "usage: %s script [-Ealnru] [-i extension] [file ...]\n"
208	    "\t%s [-Ealnu] [-i extension] [-e script] ... [-f script_file]"
209	    " ... [file ...]\n", getprogname(), getprogname());
210	exit(1);
211}
212
213/*
214 * Like fgets, but go through the chain of compilation units chaining them
215 * together.  Empty strings and files are ignored.
216 */
217char *
218cu_fgets(char *buf, int n, int *more)
219{
220	static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
221	static FILE *f;		/* Current open file */
222	static char *s;		/* Current pointer inside string */
223	static char string_ident[30];
224	char *p;
225
226again:
227	switch (state) {
228	case ST_EOF:
229		if (script == NULL) {
230			if (more != NULL)
231				*more = 0;
232			return (NULL);
233		}
234		linenum = 0;
235		switch (script->type) {
236		case CU_FILE:
237			if ((f = fopen(script->s, "r")) == NULL)
238				err(1, "%s", script->s);
239			fname = script->s;
240			state = ST_FILE;
241			goto again;
242		case CU_STRING:
243			if (((size_t)snprintf(string_ident,
244			    sizeof(string_ident), "\"%s\"", script->s)) >=
245			    sizeof(string_ident) - 1)
246				(void)strcpy(string_ident +
247				    sizeof(string_ident) - 6, " ...\"");
248			fname = string_ident;
249			s = script->s;
250			state = ST_STRING;
251			goto again;
252		}
253	case ST_FILE:
254		if ((p = fgets(buf, n, f)) != NULL) {
255			linenum++;
256			if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
257				nflag = 1;
258			if (more != NULL)
259				*more = !feof(f);
260			return (p);
261		}
262		script = script->next;
263		(void)fclose(f);
264		state = ST_EOF;
265		goto again;
266	case ST_STRING:
267		if (linenum == 0 && s[0] == '#' && s[1] == 'n')
268			nflag = 1;
269		p = buf;
270		for (;;) {
271			if (n-- <= 1) {
272				*p = '\0';
273				linenum++;
274				if (more != NULL)
275					*more = 1;
276				return (buf);
277			}
278			switch (*s) {
279			case '\0':
280				state = ST_EOF;
281				if (s == script->s) {
282					script = script->next;
283					goto again;
284				} else {
285					script = script->next;
286					*p = '\0';
287					linenum++;
288					if (more != NULL)
289						*more = 0;
290					return (buf);
291				}
292			case '\n':
293				*p++ = '\n';
294				*p = '\0';
295				s++;
296				linenum++;
297				if (more != NULL)
298					*more = 0;
299				return (buf);
300			default:
301				*p++ = *s++;
302			}
303		}
304	}
305	/* NOTREACHED */
306	return (NULL);
307}
308
309/*
310 * Like fgets, but go through the list of files chaining them together.
311 * Set len to the length of the line.
312 */
313int
314mf_fgets(SPACE *sp, enum e_spflag spflag)
315{
316	struct stat sb;
317	ssize_t len;
318	static char *p = NULL;
319	static size_t plen = 0;
320	int c;
321	static int firstfile;
322
323	if (infile == NULL) {
324		/* stdin? */
325		if (files->fname == NULL) {
326			if (inplace != NULL)
327				errx(1, "-I or -i may not be used with stdin");
328			infile = stdin;
329			fname = "stdin";
330			outfile = stdout;
331			outfname = "stdout";
332		}
333		firstfile = 1;
334	}
335
336	for (;;) {
337		if (infile != NULL && (c = getc(infile)) != EOF) {
338			(void)ungetc(c, infile);
339			break;
340		}
341		/* If we are here then either eof or no files are open yet */
342		if (infile == stdin) {
343			sp->len = 0;
344			return (0);
345		}
346		if (infile != NULL) {
347			fclose(infile);
348			if (*oldfname != '\0') {
349				/* if there was a backup file, remove it */
350				unlink(oldfname);
351				/*
352				 * Backup the original.  Note that hard links
353				 * are not supported on all filesystems.
354				 */
355				if ((link(fname, oldfname) != 0) &&
356				   (rename(fname, oldfname) != 0)) {
357					warn("rename()");
358					if (*tmpfname)
359						unlink(tmpfname);
360					exit(1);
361				}
362				*oldfname = '\0';
363			}
364			if (*tmpfname != '\0') {
365				if (outfile != NULL && outfile != stdout)
366					if (fclose(outfile) != 0) {
367						warn("fclose()");
368						unlink(tmpfname);
369						exit(1);
370					}
371				outfile = NULL;
372				if (rename(tmpfname, fname) != 0) {
373					/* this should not happen really! */
374					warn("rename()");
375					unlink(tmpfname);
376					exit(1);
377				}
378				*tmpfname = '\0';
379			}
380			outfname = NULL;
381		}
382		if (firstfile == 0)
383			files = files->next;
384		else
385			firstfile = 0;
386		if (files == NULL) {
387			sp->len = 0;
388			return (0);
389		}
390		fname = files->fname;
391		if (inplace != NULL) {
392			if (lstat(fname, &sb) != 0)
393				err(1, "%s", fname);
394			if (!(sb.st_mode & S_IFREG))
395				errx(1, "%s: %s %s", fname,
396				    "in-place editing only",
397				    "works for regular files");
398			if (*inplace != '\0') {
399				strlcpy(oldfname, fname,
400				    sizeof(oldfname));
401				len = strlcat(oldfname, inplace,
402				    sizeof(oldfname));
403				if (len > sizeof(oldfname))
404					errx(1, "%s: name too long", fname);
405			}
406			len = snprintf(tmpfname, sizeof(tmpfname),
407			    "%s/.!%ld!%s", dirname(fname), (long)getpid(),
408			    basename(fname));
409			if (len >= sizeof(tmpfname))
410				errx(1, "%s: name too long", fname);
411			unlink(tmpfname);
412			if (outfile != NULL && outfile != stdout)
413				fclose(outfile);
414			if ((outfile = fopen(tmpfname, "w")) == NULL)
415				err(1, "%s", fname);
416			fchown(fileno(outfile), sb.st_uid, sb.st_gid);
417			fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
418			outfname = tmpfname;
419			if (!ispan) {
420				linenum = 0;
421				resetstate();
422			}
423		} else {
424			outfile = stdout;
425			outfname = "stdout";
426		}
427		if ((infile = fopen(fname, "r")) == NULL) {
428			warn("%s", fname);
429			rval = 1;
430			continue;
431		}
432	}
433	/*
434	 * We are here only when infile is open and we still have something
435	 * to read from it.
436	 *
437	 * Use getline() so that we can handle essentially infinite input
438	 * data.  The p and plen are static so each invocation gives
439	 * getline() the same buffer which is expanded as needed.
440	 */
441	len = getline(&p, &plen, infile);
442	if (len == -1)
443		err(1, "%s", fname);
444	if (len != 0 && p[len - 1] == '\n')
445		len--;
446	cspace(sp, p, len, spflag);
447
448	linenum++;
449
450	return (1);
451}
452
453/*
454 * Add a compilation unit to the linked list
455 */
456static void
457add_compunit(enum e_cut type, char *s)
458{
459	struct s_compunit *cu;
460
461	if ((cu = malloc(sizeof(struct s_compunit))) == NULL)
462		err(1, "malloc");
463	cu->type = type;
464	cu->s = s;
465	cu->next = NULL;
466	*cu_nextp = cu;
467	cu_nextp = &cu->next;
468}
469
470/*
471 * Add a file to the linked list
472 */
473static void
474add_file(char *s)
475{
476	struct s_flist *fp;
477
478	if ((fp = malloc(sizeof(struct s_flist))) == NULL)
479		err(1, "malloc");
480	fp->next = NULL;
481	*fl_nextp = fp;
482	fp->fname = s;
483	fl_nextp = &fp->next;
484}
485
486int
487lastline(void)
488{
489	int ch;
490
491	if (files->next != NULL && (inplace == NULL || ispan))
492		return (0);
493	if ((ch = getc(infile)) == EOF)
494		return (1);
495	ungetc(ch, infile);
496	return (0);
497}
498