main.c revision 1590 
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 <ctype.h>
51#include <errno.h>
52#include <fcntl.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	fflag = 0;
113	while ((c = getopt(argc, argv, "ae:f:n")) != EOF)
114		switch (c) {
115		case 'a':
116			aflag = 1;
117			break;
118		case 'e':
119			eflag = 1;
120			add_compunit(CU_STRING, optarg);
121			break;
122		case 'f':
123			fflag = 1;
124			add_compunit(CU_FILE, optarg);
125			break;
126		case 'n':
127			nflag = 1;
128			break;
129		default:
130		case '?':
131			(void)fprintf(stderr,
132"usage:\tsed script [-an] [file ...]\n\tsed [-an] [-e script] ... [-f scipt_file] ... [file ...]\n");
133			exit(1);
134		}
135	argc -= optind;
136	argv += optind;
137
138	/* First usage case; script is the first arg */
139	if (!eflag && !fflag && *argv) {
140		add_compunit(CU_STRING, *argv);
141		argv++;
142	}
143
144	compile();
145
146	/* Continue with first and start second usage */
147	if (*argv)
148		for (; *argv; argv++)
149			add_file(*argv);
150	else
151		add_file(NULL);
152	process();
153	cfclose(prog, NULL);
154	if (fclose(stdout))
155		err(FATAL, "stdout: %s", strerror(errno));
156	exit (0);
157}
158
159/*
160 * Like fgets, but go through the chain of compilation units chaining them
161 * together.  Empty strings and files are ignored.
162 */
163char *
164cu_fgets(buf, n)
165	char *buf;
166	int n;
167{
168	static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
169	static FILE *f;		/* Current open file */
170	static char *s;		/* Current pointer inside string */
171	static char string_ident[30];
172	char *p;
173
174again:
175	switch (state) {
176	case ST_EOF:
177		if (script == NULL)
178			return (NULL);
179		linenum = 0;
180		switch (script->type) {
181		case CU_FILE:
182			if ((f = fopen(script->s, "r")) == NULL)
183				err(FATAL,
184				    "%s: %s", script->s, strerror(errno));
185			fname = script->s;
186			state = ST_FILE;
187			goto again;
188		case CU_STRING:
189			if ((snprintf(string_ident,
190			    sizeof(string_ident), "\"%s\"", script->s)) >=
191			    sizeof(string_ident) - 1)
192				(void)strcpy(string_ident +
193				    sizeof(string_ident) - 6, " ...\"");
194			fname = string_ident;
195			s = script->s;
196			state = ST_STRING;
197			goto again;
198		}
199	case ST_FILE:
200		if ((p = fgets(buf, n, f)) != NULL) {
201			linenum++;
202			if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
203				nflag = 1;
204			return (p);
205		}
206		script = script->next;
207		(void)fclose(f);
208		state = ST_EOF;
209		goto again;
210	case ST_STRING:
211		if (linenum == 0 && s[0] == '#' && s[1] == 'n')
212			nflag = 1;
213		p = buf;
214		for (;;) {
215			if (n-- <= 1) {
216				*p = '\0';
217				linenum++;
218				return (buf);
219			}
220			switch (*s) {
221			case '\0':
222				state = ST_EOF;
223				if (s == script->s) {
224					script = script->next;
225					goto again;
226				} else {
227					script = script->next;
228					*p = '\0';
229					linenum++;
230					return (buf);
231				}
232			case '\n':
233				*p++ = '\n';
234				*p = '\0';
235				s++;
236				linenum++;
237				return (buf);
238			default:
239				*p++ = *s++;
240			}
241		}
242	}
243	/* NOTREACHED */
244}
245
246/*
247 * Like fgets, but go through the list of files chaining them together.
248 * Set len to the length of the line.
249 */
250int
251mf_fgets(sp, spflag)
252	SPACE *sp;
253	enum e_spflag spflag;
254{
255	static FILE *f;		/* Current open file */
256	size_t len;
257	char c, *p;
258
259	if (f == NULL)
260		/* Advance to first non-empty file */
261		for (;;) {
262			if (files == NULL) {
263				lastline = 1;
264				return (0);
265			}
266			if (files->fname == NULL) {
267				f = stdin;
268				fname = "stdin";
269			} else {
270				fname = files->fname;
271				if ((f = fopen(fname, "r")) == NULL)
272					err(FATAL, "%s: %s",
273					    fname, strerror(errno));
274			}
275			if ((c = getc(f)) != EOF) {
276				(void)ungetc(c, f);
277				break;
278			}
279			(void)fclose(f);
280			files = files->next;
281		}
282
283	if (lastline) {
284		sp->len = 0;
285		return (0);
286	}
287
288	/*
289	 * Use fgetln so that we can handle essentially infinite input data.
290	 * Can't use the pointer into the stdio buffer as the process space
291	 * because the ungetc() can cause it to move.
292	 */
293	p = fgetln(f, &len);
294	if (ferror(f))
295		err(FATAL, "%s: %s", fname, strerror(errno ? errno : EIO));
296	cspace(sp, p, len, spflag);
297
298	linenum++;
299	/* Advance to next non-empty file */
300	while ((c = getc(f)) == EOF) {
301		(void)fclose(f);
302		files = files->next;
303		if (files == NULL) {
304			lastline = 1;
305			return (1);
306		}
307		if (files->fname == NULL) {
308			f = stdin;
309			fname = "stdin";
310		} else {
311			fname = files->fname;
312			if ((f = fopen(fname, "r")) == NULL)
313				err(FATAL, "%s: %s", fname, strerror(errno));
314		}
315	}
316	(void)ungetc(c, f);
317	return (1);
318}
319
320/*
321 * Add a compilation unit to the linked list
322 */
323static void
324add_compunit(type, s)
325	enum e_cut type;
326	char *s;
327{
328	struct s_compunit *cu;
329
330	cu = xmalloc(sizeof(struct s_compunit));
331	cu->type = type;
332	cu->s = s;
333	cu->next = NULL;
334	*cu_nextp = cu;
335	cu_nextp = &cu->next;
336}
337
338/*
339 * Add a file to the linked list
340 */
341static void
342add_file(s)
343	char *s;
344{
345	struct s_flist *fp;
346
347	fp = xmalloc(sizeof(struct s_flist));
348	fp->next = NULL;
349	*fl_nextp = fp;
350	fp->fname = s;
351	fl_nextp = &fp->next;
352}
353