main.c revision 58309 
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#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 /* not lint */
43
44#ifndef lint
45#if 0
46static char sccsid[] = "@(#)main.c	8.2 (Berkeley) 1/3/94";
47#endif
48static const char rcsid[] =
49  "$FreeBSD: head/usr.bin/sed/main.c 58309 2000-03-19 19:41:53Z green $";
50#endif /* not lint */
51
52#include <sys/types.h>
53
54#include <err.h>
55#include <errno.h>
56#include <fcntl.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
97int aflag, eflag, nflag;
98int rflags = 0;
99
100/*
101 * Current file and line number; line numbers restart across compilation
102 * units, but span across input files.
103 */
104char *fname;			/* File name. */
105u_long linenum;
106int lastline;			/* TRUE on the last line of the last file */
107
108static void add_compunit __P((enum e_cut, char *));
109static void add_file __P((char *));
110static void usage __P((void));
111
112int
113main(argc, argv)
114	int argc;
115	char *argv[];
116{
117	int c, fflag;
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			add_compunit(CU_STRING, optarg);
133			break;
134		case 'f':
135			fflag = 1;
136			add_compunit(CU_FILE, optarg);
137			break;
138		case 'n':
139			nflag = 1;
140			break;
141		default:
142		case '?':
143			usage();
144		}
145	argc -= optind;
146	argv += optind;
147
148	/* First usage case; script is the first arg */
149	if (!eflag && !fflag && *argv) {
150		add_compunit(CU_STRING, *argv);
151		argv++;
152	}
153
154	compile();
155
156	/* Continue with first and start second usage */
157	if (*argv)
158		for (; *argv; argv++)
159			add_file(*argv);
160	else
161		add_file(NULL);
162	process();
163	cfclose(prog, NULL);
164	if (fclose(stdout))
165		err(1, "stdout");
166	exit (0);
167}
168
169static void
170usage()
171{
172	(void)fprintf(stderr, "%s\n%s\n",
173		"usage: sed script [-Ean] [file ...]",
174		"       sed [-an] [-e script] ... [-f script_file] ... [file ...]");
175	exit(1);
176}
177
178/*
179 * Like fgets, but go through the chain of compilation units chaining them
180 * together.  Empty strings and files are ignored.
181 */
182char *
183cu_fgets(buf, n, more)
184	char *buf;
185	int n;
186	int *more;
187{
188	static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
189	static FILE *f;		/* Current open file */
190	static char *s;		/* Current pointer inside string */
191	static char string_ident[30];
192	char *p;
193
194again:
195	switch (state) {
196	case ST_EOF:
197		if (script == NULL) {
198			if (more != NULL)
199				*more = 0;
200			return (NULL);
201		}
202		linenum = 0;
203		switch (script->type) {
204		case CU_FILE:
205			if ((f = fopen(script->s, "r")) == NULL)
206				err(1, "%s", script->s);
207			fname = script->s;
208			state = ST_FILE;
209			goto again;
210		case CU_STRING:
211			if ((snprintf(string_ident,
212			    sizeof(string_ident), "\"%s\"", script->s)) >=
213			    sizeof(string_ident) - 1)
214				(void)strcpy(string_ident +
215				    sizeof(string_ident) - 6, " ...\"");
216			fname = string_ident;
217			s = script->s;
218			state = ST_STRING;
219			goto again;
220		}
221	case ST_FILE:
222		if ((p = fgets(buf, n, f)) != NULL) {
223			linenum++;
224			if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
225				nflag = 1;
226			if (more != NULL)
227				*more = !feof(f);
228			return (p);
229		}
230		script = script->next;
231		(void)fclose(f);
232		state = ST_EOF;
233		goto again;
234	case ST_STRING:
235		if (linenum == 0 && s[0] == '#' && s[1] == 'n')
236			nflag = 1;
237		p = buf;
238		for (;;) {
239			if (n-- <= 1) {
240				*p = '\0';
241				linenum++;
242				if (more != NULL)
243					*more = 1;
244				return (buf);
245			}
246			switch (*s) {
247			case '\0':
248				state = ST_EOF;
249				if (s == script->s) {
250					script = script->next;
251					goto again;
252				} else {
253					script = script->next;
254					*p = '\0';
255					linenum++;
256					if (more != NULL)
257						*more = 0;
258					return (buf);
259				}
260			case '\n':
261				*p++ = '\n';
262				*p = '\0';
263				s++;
264				linenum++;
265				if (more != NULL)
266					*more = 0;
267				return (buf);
268			default:
269				*p++ = *s++;
270			}
271		}
272	}
273	/* NOTREACHED */
274	return (NULL);
275}
276
277/*
278 * Like fgets, but go through the list of files chaining them together.
279 * Set len to the length of the line.
280 */
281int
282mf_fgets(sp, spflag)
283	SPACE *sp;
284	enum e_spflag spflag;
285{
286	static FILE *f;		/* Current open file */
287	size_t len;
288	char *p;
289	int c;
290
291	if (f == NULL)
292		/* Advance to first non-empty file */
293		for (;;) {
294			if (files == NULL) {
295				lastline = 1;
296				return (0);
297			}
298			if (files->fname == NULL) {
299				f = stdin;
300				fname = "stdin";
301			} else {
302				fname = files->fname;
303				if ((f = fopen(fname, "r")) == NULL)
304					err(1, "%s", fname);
305			}
306			if ((c = getc(f)) != EOF) {
307				(void)ungetc(c, f);
308				break;
309			}
310			(void)fclose(f);
311			files = files->next;
312		}
313
314	if (lastline) {
315		sp->len = 0;
316		return (0);
317	}
318
319	/*
320	 * Use fgetln so that we can handle essentially infinite input data.
321	 * Can't use the pointer into the stdio buffer as the process space
322	 * because the ungetc() can cause it to move.
323	 */
324	p = fgetln(f, &len);
325	if (ferror(f))
326		errx(1, "%s: %s", fname, strerror(errno ? errno : EIO));
327	cspace(sp, p, len, spflag);
328
329	linenum++;
330	/* Advance to next non-empty file */
331	while ((c = getc(f)) == EOF) {
332		(void)fclose(f);
333		files = files->next;
334		if (files == NULL) {
335			lastline = 1;
336			return (1);
337		}
338		if (files->fname == NULL) {
339			f = stdin;
340			fname = "stdin";
341		} else {
342			fname = files->fname;
343			if ((f = fopen(fname, "r")) == NULL)
344				err(1, "%s", fname);
345		}
346	}
347	(void)ungetc(c, f);
348	return (1);
349}
350
351/*
352 * Add a compilation unit to the linked list
353 */
354static void
355add_compunit(type, s)
356	enum e_cut type;
357	char *s;
358{
359	struct s_compunit *cu;
360
361	cu = xmalloc(sizeof(struct s_compunit));
362	cu->type = type;
363	cu->s = s;
364	cu->next = NULL;
365	*cu_nextp = cu;
366	cu_nextp = &cu->next;
367}
368
369/*
370 * Add a file to the linked list
371 */
372static void
373add_file(s)
374	char *s;
375{
376	struct s_flist *fp;
377
378	fp = xmalloc(sizeof(struct s_flist));
379	fp->next = NULL;
380	*fl_nextp = fp;
381	fp->fname = s;
382	fl_nextp = &fp->next;
383}
384