main.c revision 19825 
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 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
45static char sccsid[] = "@(#)main.c	8.2 (Berkeley) 1/3/94";
46#endif /* not lint */
47
48#include <sys/types.h>
49
50#include <errno.h>
51#include <fcntl.h>
52#include <locale.h>
53#include <regex.h>
54#include <stddef.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include <unistd.h>
59
60#include "defs.h"
61#include "extern.h"
62
63/*
64 * Linked list of units (strings and files) to be compiled
65 */
66struct s_compunit {
67	struct s_compunit *next;
68	enum e_cut {CU_FILE, CU_STRING} type;
69	char *s;			/* Pointer to string or fname */
70};
71
72/*
73 * Linked list pointer to compilation units and pointer to current
74 * next pointer.
75 */
76static struct s_compunit *script, **cu_nextp = &script;
77
78/*
79 * Linked list of files to be processed
80 */
81struct s_flist {
82	char *fname;
83	struct s_flist *next;
84};
85
86/*
87 * Linked list pointer to files and pointer to current
88 * next pointer.
89 */
90static struct s_flist *files, **fl_nextp = &files;
91
92int aflag, eflag, nflag;
93
94/*
95 * Current file and line number; line numbers restart across compilation
96 * units, but span across input files.
97 */
98char *fname;			/* File name. */
99u_long linenum;
100int lastline;			/* TRUE on the last line of the last file */
101
102static void add_compunit __P((enum e_cut, char *));
103static void add_file __P((char *));
104
105int
106main(argc, argv)
107	int argc;
108	char *argv[];
109{
110	int c, fflag;
111
112	(void) setlocale(LC_ALL, "");
113
114	fflag = 0;
115	while ((c = getopt(argc, argv, "ae:f:n")) != EOF)
116		switch (c) {
117		case 'a':
118			aflag = 1;
119			break;
120		case 'e':
121			eflag = 1;
122			add_compunit(CU_STRING, optarg);
123			break;
124		case 'f':
125			fflag = 1;
126			add_compunit(CU_FILE, optarg);
127			break;
128		case 'n':
129			nflag = 1;
130			break;
131		default:
132		case '?':
133			(void)fprintf(stderr,
134"usage:\tsed script [-an] [file ...]\n\tsed [-an] [-e script] ... [-f script_file] ... [file ...]\n");
135			exit(1);
136		}
137	argc -= optind;
138	argv += optind;
139
140	/* First usage case; script is the first arg */
141	if (!eflag && !fflag && *argv) {
142		add_compunit(CU_STRING, *argv);
143		argv++;
144	}
145
146	compile();
147
148	/* Continue with first and start second usage */
149	if (*argv)
150		for (; *argv; argv++)
151			add_file(*argv);
152	else
153		add_file(NULL);
154	process();
155	cfclose(prog, NULL);
156	if (fclose(stdout))
157		err(FATAL, "stdout: %s", strerror(errno));
158	exit (0);
159}
160
161/*
162 * Like fgets, but go through the chain of compilation units chaining them
163 * together.  Empty strings and files are ignored.
164 */
165char *
166cu_fgets(buf, n)
167	char *buf;
168	int n;
169{
170	static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
171	static FILE *f;		/* Current open file */
172	static char *s;		/* Current pointer inside string */
173	static char string_ident[30];
174	char *p;
175
176again:
177	switch (state) {
178	case ST_EOF:
179		if (script == NULL)
180			return (NULL);
181		linenum = 0;
182		switch (script->type) {
183		case CU_FILE:
184			if ((f = fopen(script->s, "r")) == NULL)
185				err(FATAL,
186				    "%s: %s", script->s, strerror(errno));
187			fname = script->s;
188			state = ST_FILE;
189			goto again;
190		case CU_STRING:
191			if ((snprintf(string_ident,
192			    sizeof(string_ident), "\"%s\"", script->s)) >=
193			    sizeof(string_ident) - 1)
194				(void)strcpy(string_ident +
195				    sizeof(string_ident) - 6, " ...\"");
196			fname = string_ident;
197			s = script->s;
198			state = ST_STRING;
199			goto again;
200		}
201	case ST_FILE:
202		if ((p = fgets(buf, n, f)) != NULL) {
203			linenum++;
204			if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
205				nflag = 1;
206			return (p);
207		}
208		script = script->next;
209		(void)fclose(f);
210		state = ST_EOF;
211		goto again;
212	case ST_STRING:
213		if (linenum == 0 && s[0] == '#' && s[1] == 'n')
214			nflag = 1;
215		p = buf;
216		for (;;) {
217			if (n-- <= 1) {
218				*p = '\0';
219				linenum++;
220				return (buf);
221			}
222			switch (*s) {
223			case '\0':
224				state = ST_EOF;
225				if (s == script->s) {
226					script = script->next;
227					goto again;
228				} else {
229					script = script->next;
230					*p = '\0';
231					linenum++;
232					return (buf);
233				}
234			case '\n':
235				*p++ = '\n';
236				*p = '\0';
237				s++;
238				linenum++;
239				return (buf);
240			default:
241				*p++ = *s++;
242			}
243		}
244	}
245	/* NOTREACHED */
246}
247
248/*
249 * Like fgets, but go through the list of files chaining them together.
250 * Set len to the length of the line.
251 */
252int
253mf_fgets(sp, spflag)
254	SPACE *sp;
255	enum e_spflag spflag;
256{
257	static FILE *f;		/* Current open file */
258	size_t len;
259	char c, *p;
260
261	if (f == NULL)
262		/* Advance to first non-empty file */
263		for (;;) {
264			if (files == NULL) {
265				lastline = 1;
266				return (0);
267			}
268			if (files->fname == NULL) {
269				f = stdin;
270				fname = "stdin";
271			} else {
272				fname = files->fname;
273				if ((f = fopen(fname, "r")) == NULL)
274					err(FATAL, "%s: %s",
275					    fname, strerror(errno));
276			}
277			if (!feof(f)) {
278				break;
279			}
280			(void)fclose(f);
281			files = files->next;
282		}
283
284	if (lastline) {
285		sp->len = 0;
286		return (0);
287	}
288
289	/*
290	 * Use fgetln so that we can handle essentially infinite input data.
291	 */
292	p = fgetln(f, &len);
293	if (ferror(f))
294		err(FATAL, "%s: %s", fname, strerror(errno ? errno : EIO));
295	cspace(sp, p, len, spflag);
296
297	linenum++;
298	/* Advance to next non-empty file */
299	while (feof(f)) {
300		(void)fclose(f);
301		files = files->next;
302		if (files == NULL) {
303			lastline = 1;
304			return (1);
305		}
306		if (files->fname == NULL) {
307			f = stdin;
308			fname = "stdin";
309		} else {
310			fname = files->fname;
311			if ((f = fopen(fname, "r")) == NULL)
312				err(FATAL, "%s: %s", fname, strerror(errno));
313		}
314	}
315	return (1);
316}
317
318/*
319 * Add a compilation unit to the linked list
320 */
321static void
322add_compunit(type, s)
323	enum e_cut type;
324	char *s;
325{
326	struct s_compunit *cu;
327
328	cu = xmalloc(sizeof(struct s_compunit));
329	cu->type = type;
330	cu->s = s;
331	cu->next = NULL;
332	*cu_nextp = cu;
333	cu_nextp = &cu->next;
334}
335
336/*
337 * Add a file to the linked list
338 */
339static void
340add_file(s)
341	char *s;
342{
343	struct s_flist *fp;
344
345	fp = xmalloc(sizeof(struct s_flist));
346	fp->next = NULL;
347	*fl_nextp = fp;
348	fp->fname = s;
349	fl_nextp = &fp->next;
350}
351