main.c revision 87766 
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 * 3. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 *	This product includes software developed by the University of
20 *	California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 *    may be used to endorse or promote products derived from this software
23 *    without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 */
37
38#include <sys/cdefs.h>
39__FBSDID("$FreeBSD: head/usr.bin/sed/main.c 87766 2001-12-12 23:20:16Z markm $");
40
41#ifndef lint
42static const char copyright[] =
43"@(#) Copyright (c) 1992, 1993\n\
44	The Regents of the University of California.  All rights reserved.\n";
45#endif
46
47#ifndef lint
48static const char sccsid[] = "@(#)main.c	8.2 (Berkeley) 1/3/94";
49#endif
50
51#include <sys/types.h>
52
53#include <err.h>
54#include <errno.h>
55#include <fcntl.h>
56#include <locale.h>
57#include <regex.h>
58#include <stddef.h>
59#include <stdio.h>
60#include <stdlib.h>
61#include <string.h>
62#include <unistd.h>
63
64#include "defs.h"
65#include "extern.h"
66
67/*
68 * Linked list of units (strings and files) to be compiled
69 */
70struct s_compunit {
71	struct s_compunit *next;
72	enum e_cut {CU_FILE, CU_STRING} type;
73	char *s;			/* Pointer to string or fname */
74};
75
76/*
77 * Linked list pointer to compilation units and pointer to current
78 * next pointer.
79 */
80static struct s_compunit *script, **cu_nextp = &script;
81
82/*
83 * Linked list of files to be processed
84 */
85struct s_flist {
86	char *fname;
87	struct s_flist *next;
88};
89
90/*
91 * Linked list pointer to files and pointer to current
92 * next pointer.
93 */
94static struct s_flist *files, **fl_nextp = &files;
95
96int aflag, eflag, nflag;
97int rflags = 0;
98
99/*
100 * Current file and line number; line numbers restart across compilation
101 * units, but span across input files.
102 */
103const char *fname;		/* File name. */
104u_long linenum;
105int lastline;			/* TRUE on the last line of the last file */
106
107static void add_compunit __P((enum e_cut, char *));
108static void add_file __P((char *));
109static void usage __P((void));
110
111int
112main(argc, argv)
113	int argc;
114	char *argv[];
115{
116	int c, fflag;
117	char *temp_arg;
118
119	(void) setlocale(LC_ALL, "");
120
121	fflag = 0;
122	while ((c = getopt(argc, argv, "Eae:f:n")) != -1)
123		switch (c) {
124		case 'E':
125			rflags = REG_EXTENDED;
126			break;
127		case 'a':
128			aflag = 1;
129			break;
130		case 'e':
131			eflag = 1;
132			if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL)
133				err(1, "malloc");
134			strcpy(temp_arg, optarg);
135			strcat(temp_arg, "\n");
136			add_compunit(CU_STRING, temp_arg);
137			break;
138		case 'f':
139			fflag = 1;
140			add_compunit(CU_FILE, optarg);
141			break;
142		case 'n':
143			nflag = 1;
144			break;
145		default:
146		case '?':
147			usage();
148		}
149	argc -= optind;
150	argv += optind;
151
152	/* First usage case; script is the first arg */
153	if (!eflag && !fflag && *argv) {
154		add_compunit(CU_STRING, *argv);
155		argv++;
156	}
157
158	compile();
159
160	/* Continue with first and start second usage */
161	if (*argv)
162		for (; *argv; argv++)
163			add_file(*argv);
164	else
165		add_file(NULL);
166	process();
167	cfclose(prog, NULL);
168	if (fclose(stdout))
169		err(1, "stdout");
170	exit (0);
171}
172
173static void
174usage()
175{
176	(void)fprintf(stderr, "%s\n%s\n",
177		"usage: sed script [-Ean] [file ...]",
178		"       sed [-an] [-e script] ... [-f script_file] ... [file ...]");
179	exit(1);
180}
181
182/*
183 * Like fgets, but go through the chain of compilation units chaining them
184 * together.  Empty strings and files are ignored.
185 */
186char *
187cu_fgets(buf, n, more)
188	char *buf;
189	int n;
190	int *more;
191{
192	static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
193	static FILE *f;		/* Current open file */
194	static char *s;		/* Current pointer inside string */
195	static char string_ident[30];
196	char *p;
197
198again:
199	switch (state) {
200	case ST_EOF:
201		if (script == NULL) {
202			if (more != NULL)
203				*more = 0;
204			return (NULL);
205		}
206		linenum = 0;
207		switch (script->type) {
208		case CU_FILE:
209			if ((f = fopen(script->s, "r")) == NULL)
210				err(1, "%s", script->s);
211			fname = script->s;
212			state = ST_FILE;
213			goto again;
214		case CU_STRING:
215			if ((snprintf(string_ident,
216			    sizeof(string_ident), "\"%s\"", script->s)) >=
217			    sizeof(string_ident) - 1)
218				(void)strcpy(string_ident +
219				    sizeof(string_ident) - 6, " ...\"");
220			fname = string_ident;
221			s = script->s;
222			state = ST_STRING;
223			goto again;
224		}
225	case ST_FILE:
226		if ((p = fgets(buf, n, f)) != NULL) {
227			linenum++;
228			if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
229				nflag = 1;
230			if (more != NULL)
231				*more = !feof(f);
232			return (p);
233		}
234		script = script->next;
235		(void)fclose(f);
236		state = ST_EOF;
237		goto again;
238	case ST_STRING:
239		if (linenum == 0 && s[0] == '#' && s[1] == 'n')
240			nflag = 1;
241		p = buf;
242		for (;;) {
243			if (n-- <= 1) {
244				*p = '\0';
245				linenum++;
246				if (more != NULL)
247					*more = 1;
248				return (buf);
249			}
250			switch (*s) {
251			case '\0':
252				state = ST_EOF;
253				if (s == script->s) {
254					script = script->next;
255					goto again;
256				} else {
257					script = script->next;
258					*p = '\0';
259					linenum++;
260					if (more != NULL)
261						*more = 0;
262					return (buf);
263				}
264			case '\n':
265				*p++ = '\n';
266				*p = '\0';
267				s++;
268				linenum++;
269				if (more != NULL)
270					*more = 0;
271				return (buf);
272			default:
273				*p++ = *s++;
274			}
275		}
276	}
277	/* NOTREACHED */
278	return (NULL);
279}
280
281/*
282 * Like fgets, but go through the list of files chaining them together.
283 * Set len to the length of the line.
284 */
285int
286mf_fgets(sp, spflag)
287	SPACE *sp;
288	enum e_spflag spflag;
289{
290	static FILE *f;		/* Current open file */
291	size_t len;
292	char *p;
293	int c;
294
295	if (f == NULL)
296		/* Advance to first non-empty file */
297		for (;;) {
298			if (files == NULL) {
299				lastline = 1;
300				return (0);
301			}
302			if (files->fname == NULL) {
303				f = stdin;
304				fname = "stdin";
305			} else {
306				fname = files->fname;
307				if ((f = fopen(fname, "r")) == NULL)
308					err(1, "%s", fname);
309			}
310			if ((c = getc(f)) != EOF) {
311				(void)ungetc(c, f);
312				break;
313			}
314			(void)fclose(f);
315			files = files->next;
316		}
317
318	if (lastline) {
319		sp->len = 0;
320		return (0);
321	}
322
323	/*
324	 * Use fgetln so that we can handle essentially infinite input data.
325	 * Can't use the pointer into the stdio buffer as the process space
326	 * because the ungetc() can cause it to move.
327	 */
328	p = fgetln(f, &len);
329	if (ferror(f))
330		errx(1, "%s: %s", fname, strerror(errno ? errno : EIO));
331	cspace(sp, p, len, spflag);
332
333	linenum++;
334	/* Advance to next non-empty file */
335	while ((c = getc(f)) == EOF) {
336		(void)fclose(f);
337		files = files->next;
338		if (files == NULL) {
339			lastline = 1;
340			return (1);
341		}
342		if (files->fname == NULL) {
343			f = stdin;
344			fname = "stdin";
345		} else {
346			fname = files->fname;
347			if ((f = fopen(fname, "r")) == NULL)
348				err(1, "%s", fname);
349		}
350	}
351	(void)ungetc(c, f);
352	return (1);
353}
354
355/*
356 * Add a compilation unit to the linked list
357 */
358static void
359add_compunit(type, s)
360	enum e_cut type;
361	char *s;
362{
363	struct s_compunit *cu;
364
365	if ((cu = malloc(sizeof(struct s_compunit))) == NULL)
366		err(1, "malloc");
367	cu->type = type;
368	cu->s = s;
369	cu->next = NULL;
370	*cu_nextp = cu;
371	cu_nextp = &cu->next;
372}
373
374/*
375 * Add a file to the linked list
376 */
377static void
378add_file(s)
379	char *s;
380{
381	struct s_flist *fp;
382
383	if ((fp = malloc(sizeof(struct s_flist))) == NULL)
384		err(1, "malloc");
385	fp->next = NULL;
386	*fl_nextp = fp;
387	fp->fname = s;
388	fl_nextp = &fp->next;
389}
390