main.c revision 60401 
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 60401 2000-05-11 20:15:16Z nsayer $";
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	char *temp_arg;
119
120	(void) setlocale(LC_ALL, "");
121
122	fflag = 0;
123	while ((c = getopt(argc, argv, "Eae:f:n")) != -1)
124		switch (c) {
125		case 'E':
126			rflags = REG_EXTENDED;
127			break;
128		case 'a':
129			aflag = 1;
130			break;
131		case 'e':
132			eflag = 1;
133			temp_arg = xmalloc(strlen(optarg) + 2);
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	cu = xmalloc(sizeof(struct s_compunit));
366	cu->type = type;
367	cu->s = s;
368	cu->next = NULL;
369	*cu_nextp = cu;
370	cu_nextp = &cu->next;
371}
372
373/*
374 * Add a file to the linked list
375 */
376static void
377add_file(s)
378	char *s;
379{
380	struct s_flist *fp;
381
382	fp = xmalloc(sizeof(struct s_flist));
383	fp->next = NULL;
384	*fl_nextp = fp;
385	fp->fname = s;
386	fl_nextp = &fp->next;
387}
388