main.c revision 168921 
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: head/usr.bin/sed/main.c 168921 2007-04-21 01:21:36Z yar $");
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
104static int ispan;		/* Whether inplace editing spans across files */
105
106/*
107 * Current file and line number; line numbers restart across compilation
108 * units, but span across input files.  The latter is optional if editing
109 * in place.
110 */
111const char *fname;		/* File name. */
112const char *outfname;		/* Output file name */
113static char oldfname[PATH_MAX];	/* Old file name (for in-place editing) */
114static char tmpfname[PATH_MAX];	/* Temporary file name (for in-place editing) */
115const char *inplace;		/* Inplace edit file extension. */
116u_long linenum;
117
118static void add_compunit(enum e_cut, char *);
119static void add_file(char *);
120static void usage(void);
121
122int
123main(int argc, char *argv[])
124{
125	int c, fflag;
126	char *temp_arg;
127
128	(void) setlocale(LC_ALL, "");
129
130	fflag = 0;
131	inplace = NULL;
132
133	while ((c = getopt(argc, argv, "EI:ae:f:i:ln")) != -1)
134		switch (c) {
135		case 'E':
136			rflags = REG_EXTENDED;
137			break;
138		case 'I':
139			inplace = optarg;
140			ispan = 1;	/* span across input files */
141			break;
142		case 'a':
143			aflag = 1;
144			break;
145		case 'e':
146			eflag = 1;
147			if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL)
148				err(1, "malloc");
149			strcpy(temp_arg, optarg);
150			strcat(temp_arg, "\n");
151			add_compunit(CU_STRING, temp_arg);
152			break;
153		case 'f':
154			fflag = 1;
155			add_compunit(CU_FILE, optarg);
156			break;
157		case 'i':
158			inplace = optarg;
159			ispan = 0;	/* don't span across input files */
160			break;
161		case 'l':
162			if(setlinebuf(stdout) != 0)
163				warnx("setlinebuf() failed");
164			break;
165		case 'n':
166			nflag = 1;
167			break;
168		default:
169		case '?':
170			usage();
171		}
172	argc -= optind;
173	argv += optind;
174
175	/* First usage case; script is the first arg */
176	if (!eflag && !fflag && *argv) {
177		add_compunit(CU_STRING, *argv);
178		argv++;
179	}
180
181	compile();
182
183	/* Continue with first and start second usage */
184	if (*argv)
185		for (; *argv; argv++)
186			add_file(*argv);
187	else
188		add_file(NULL);
189	process();
190	cfclose(prog, NULL);
191	if (fclose(stdout))
192		err(1, "stdout");
193	exit(rval);
194}
195
196static void
197usage(void)
198{
199	(void)fprintf(stderr, "%s\n%s\n",
200		"usage: sed script [-Ealn] [-i extension] [file ...]",
201		"       sed [-Ealn] [-i extension] [-e script] ... [-f script_file] ... [file ...]");
202	exit(1);
203}
204
205/*
206 * Like fgets, but go through the chain of compilation units chaining them
207 * together.  Empty strings and files are ignored.
208 */
209char *
210cu_fgets(char *buf, int n, int *more)
211{
212	static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
213	static FILE *f;		/* Current open file */
214	static char *s;		/* Current pointer inside string */
215	static char string_ident[30];
216	char *p;
217
218again:
219	switch (state) {
220	case ST_EOF:
221		if (script == NULL) {
222			if (more != NULL)
223				*more = 0;
224			return (NULL);
225		}
226		linenum = 0;
227		switch (script->type) {
228		case CU_FILE:
229			if ((f = fopen(script->s, "r")) == NULL)
230				err(1, "%s", script->s);
231			fname = script->s;
232			state = ST_FILE;
233			goto again;
234		case CU_STRING:
235			if ((snprintf(string_ident,
236			    sizeof(string_ident), "\"%s\"", script->s)) >=
237			    sizeof(string_ident) - 1)
238				(void)strcpy(string_ident +
239				    sizeof(string_ident) - 6, " ...\"");
240			fname = string_ident;
241			s = script->s;
242			state = ST_STRING;
243			goto again;
244		}
245	case ST_FILE:
246		if ((p = fgets(buf, n, f)) != NULL) {
247			linenum++;
248			if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
249				nflag = 1;
250			if (more != NULL)
251				*more = !feof(f);
252			return (p);
253		}
254		script = script->next;
255		(void)fclose(f);
256		state = ST_EOF;
257		goto again;
258	case ST_STRING:
259		if (linenum == 0 && s[0] == '#' && s[1] == 'n')
260			nflag = 1;
261		p = buf;
262		for (;;) {
263			if (n-- <= 1) {
264				*p = '\0';
265				linenum++;
266				if (more != NULL)
267					*more = 1;
268				return (buf);
269			}
270			switch (*s) {
271			case '\0':
272				state = ST_EOF;
273				if (s == script->s) {
274					script = script->next;
275					goto again;
276				} else {
277					script = script->next;
278					*p = '\0';
279					linenum++;
280					if (more != NULL)
281						*more = 0;
282					return (buf);
283				}
284			case '\n':
285				*p++ = '\n';
286				*p = '\0';
287				s++;
288				linenum++;
289				if (more != NULL)
290					*more = 0;
291				return (buf);
292			default:
293				*p++ = *s++;
294			}
295		}
296	}
297	/* NOTREACHED */
298	return (NULL);
299}
300
301/*
302 * Like fgets, but go through the list of files chaining them together.
303 * Set len to the length of the line.
304 */
305int
306mf_fgets(SPACE *sp, enum e_spflag spflag)
307{
308	struct stat sb;
309	size_t len;
310	char *p;
311	int c;
312	static int firstfile;
313
314	if (infile == NULL) {
315		/* stdin? */
316		if (files->fname == NULL) {
317			if (inplace != NULL)
318				errx(1, "-I or -i may not be used with stdin");
319			infile = stdin;
320			fname = "stdin";
321			outfile = stdout;
322			outfname = "stdout";
323		}
324		firstfile = 1;
325	}
326
327	for (;;) {
328		if (infile != NULL && (c = getc(infile)) != EOF) {
329			(void)ungetc(c, infile);
330			break;
331		}
332		/* If we are here then either eof or no files are open yet */
333		if (infile == stdin) {
334			sp->len = 0;
335			return (0);
336		}
337		if (infile != NULL) {
338			fclose(infile);
339			if (*oldfname != '\0') {
340				if (rename(fname, oldfname) != 0) {
341					warn("rename()");
342					unlink(tmpfname);
343					exit(1);
344				}
345				*oldfname = '\0';
346			}
347			if (*tmpfname != '\0') {
348				if (outfile != NULL && outfile != stdout)
349					fclose(outfile);
350				outfile = NULL;
351				rename(tmpfname, fname);
352				*tmpfname = '\0';
353			}
354			outfname = NULL;
355		}
356		if (firstfile == 0)
357			files = files->next;
358		else
359			firstfile = 0;
360		if (files == NULL) {
361			sp->len = 0;
362			return (0);
363		}
364		fname = files->fname;
365		if (inplace != NULL) {
366			if (lstat(fname, &sb) != 0)
367				err(1, "%s", fname);
368			if (!(sb.st_mode & S_IFREG))
369				errx(1, "%s: %s %s", fname,
370				    "in-place editing only",
371				    "works for regular files");
372			if (*inplace != '\0') {
373				strlcpy(oldfname, fname,
374				    sizeof(oldfname));
375				len = strlcat(oldfname, inplace,
376				    sizeof(oldfname));
377				if (len > sizeof(oldfname))
378					errx(1, "%s: name too long", fname);
379			}
380			len = snprintf(tmpfname, sizeof(tmpfname),
381			    "%s/.!%ld!%s", dirname(fname), (long)getpid(),
382			    basename(fname));
383			if (len >= sizeof(tmpfname))
384				errx(1, "%s: name too long", fname);
385			unlink(tmpfname);
386			if ((outfile = fopen(tmpfname, "w")) == NULL)
387				err(1, "%s", fname);
388			fchown(fileno(outfile), sb.st_uid, sb.st_gid);
389			fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
390			outfname = tmpfname;
391			if (!ispan) {
392				linenum = 0;
393				resetranges();
394			}
395		} else {
396			outfile = stdout;
397			outfname = "stdout";
398		}
399		if ((infile = fopen(fname, "r")) == NULL) {
400			warn("%s", fname);
401			rval = 1;
402			continue;
403		}
404	}
405	/*
406	 * We are here only when infile is open and we still have something
407	 * to read from it.
408	 *
409	 * Use fgetln so that we can handle essentially infinite input data.
410	 * Can't use the pointer into the stdio buffer as the process space
411	 * because the ungetc() can cause it to move.
412	 */
413	p = fgetln(infile, &len);
414	if (ferror(infile))
415		errx(1, "%s: %s", fname, strerror(errno ? errno : EIO));
416	if (len != 0 && p[len - 1] == '\n')
417		len--;
418	cspace(sp, p, len, spflag);
419
420	linenum++;
421
422	return (1);
423}
424
425/*
426 * Add a compilation unit to the linked list
427 */
428static void
429add_compunit(enum e_cut type, char *s)
430{
431	struct s_compunit *cu;
432
433	if ((cu = malloc(sizeof(struct s_compunit))) == NULL)
434		err(1, "malloc");
435	cu->type = type;
436	cu->s = s;
437	cu->next = NULL;
438	*cu_nextp = cu;
439	cu_nextp = &cu->next;
440}
441
442/*
443 * Add a file to the linked list
444 */
445static void
446add_file(char *s)
447{
448	struct s_flist *fp;
449
450	if ((fp = malloc(sizeof(struct s_flist))) == NULL)
451		err(1, "malloc");
452	fp->next = NULL;
453	*fl_nextp = fp;
454	fp->fname = s;
455	fl_nextp = &fp->next;
456}
457
458int
459lastline(void)
460{
461	int ch;
462
463	if (files->next != NULL && (inplace == NULL || ispan))
464		return (0);
465	if ((ch = getc(infile)) == EOF)
466		return (1);
467	ungetc(ch, infile);
468	return (0);
469}
470