main.c revision 1.12 
1/*	$NetBSD: main.c,v 1.12 2002/05/17 17:27:12 wiz Exp $	*/
2
3/*-
4 * Copyright (c) 1992 Diomidis Spinellis.
5 * Copyright (c) 1992, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Diomidis Spinellis of Imperial College, University of London.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 *    must display the following acknowledgement:
21 *	This product includes software developed by the University of
22 *	California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 *    may be used to endorse or promote products derived from this software
25 *    without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 */
39
40#include <sys/cdefs.h>
41#ifndef lint
42__COPYRIGHT("@(#) Copyright (c) 1992, 1993\n\
43	The Regents of the University of California.  All rights reserved.\n");
44#endif /* not lint */
45
46#ifndef lint
47#if 0
48static char sccsid[] = "@(#)main.c	8.2 (Berkeley) 1/3/94";
49#else
50__RCSID("$NetBSD: main.c,v 1.12 2002/05/17 17:27:12 wiz Exp $");
51#endif
52#endif /* not lint */
53
54#include <sys/types.h>
55
56#include <ctype.h>
57#include <errno.h>
58#include <fcntl.h>
59#include <regex.h>
60#include <stddef.h>
61#include <stdio.h>
62#include <stdlib.h>
63#include <string.h>
64#include <unistd.h>
65
66#include "defs.h"
67#include "extern.h"
68
69/*
70 * Linked list of units (strings and files) to be compiled
71 */
72struct s_compunit {
73	struct s_compunit *next;
74	enum e_cut {CU_FILE, CU_STRING} type;
75	char *s;			/* Pointer to string or fname */
76};
77
78/*
79 * Linked list pointer to compilation units and pointer to current
80 * next pointer.
81 */
82static struct s_compunit *script, **cu_nextp = &script;
83
84/*
85 * Linked list of files to be processed
86 */
87struct s_flist {
88	char *fname;
89	struct s_flist *next;
90};
91
92/*
93 * Linked list pointer to files and pointer to current
94 * next pointer.
95 */
96static struct s_flist *files, **fl_nextp = &files;
97
98int aflag, eflag, nflag, ere;
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 *));
110int	main __P((int, char **));
111
112int
113main(argc, argv)
114	int argc;
115	char *argv[];
116{
117	int c, fflag;
118
119	fflag = 0;
120	while ((c = getopt(argc, argv, "ae:f:nE")) != -1)
121		switch (c) {
122		case 'a':
123			aflag = 1;
124			break;
125		case 'e':
126			eflag = 1;
127			add_compunit(CU_STRING, optarg);
128			break;
129		case 'f':
130			fflag = 1;
131			add_compunit(CU_FILE, optarg);
132			break;
133		case 'n':
134			nflag = 1;
135			break;
136		case 'E':
137			ere = REG_EXTENDED;
138			break;
139		default:
140		case '?':
141			(void)fprintf(stderr,
142"usage:\t%s script [-anE] [file ...]\n\tsed [-an] [-e script] ... [-f script_file] ... [file ...]\n",
143			    getprogname());
144			exit(1);
145		}
146	argc -= optind;
147	argv += optind;
148
149	/* First usage case; script is the first arg */
150	if (!eflag && !fflag && *argv) {
151		add_compunit(CU_STRING, *argv);
152		argv++;
153	}
154
155	compile();
156
157	/* Continue with first and start second usage */
158	if (*argv)
159		for (; *argv; argv++)
160			add_file(*argv);
161	else
162		add_file(NULL);
163	process();
164	cfclose(prog, NULL);
165	if (fclose(stdout))
166		err(FATAL, "stdout: %s", strerror(errno));
167	exit (0);
168}
169
170/*
171 * Like fgets, but go through the chain of compilation units chaining them
172 * together.  Empty strings and files are ignored.
173 */
174char *
175cu_fgets(buf, n)
176	char *buf;
177	int n;
178{
179	static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
180	static FILE *f;		/* Current open file */
181	static char *s;		/* Current pointer inside string */
182	static char string_ident[30];
183	char *p;
184
185again:
186	switch (state) {
187	case ST_EOF:
188		if (script == NULL)
189			return (NULL);
190		linenum = 0;
191		switch (script->type) {
192		case CU_FILE:
193			if ((f = fopen(script->s, "r")) == NULL)
194				err(FATAL,
195				    "%s: %s", script->s, strerror(errno));
196			fname = script->s;
197			state = ST_FILE;
198			goto again;
199		case CU_STRING:
200			if ((snprintf(string_ident,
201			    sizeof(string_ident), "\"%s\"", script->s)) >=
202			    sizeof(string_ident) - 1)
203				(void)strcpy(string_ident +
204				    sizeof(string_ident) - 6, " ...\"");
205			fname = string_ident;
206			s = script->s;
207			state = ST_STRING;
208			goto again;
209		}
210	case ST_FILE:
211		if ((p = fgets(buf, n, f)) != NULL) {
212			linenum++;
213			if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
214				nflag = 1;
215			return (p);
216		}
217		script = script->next;
218		(void)fclose(f);
219		state = ST_EOF;
220		goto again;
221	case ST_STRING:
222		if (linenum == 0 && s[0] == '#' && s[1] == 'n')
223			nflag = 1;
224		p = buf;
225		for (;;) {
226			if (n-- <= 1) {
227				*p = '\0';
228				linenum++;
229				return (buf);
230			}
231			switch (*s) {
232			case '\0':
233				state = ST_EOF;
234				if (s == script->s) {
235					script = script->next;
236					goto again;
237				} else {
238					script = script->next;
239					*p = '\0';
240					linenum++;
241					return (buf);
242				}
243			case '\n':
244				*p++ = '\n';
245				*p = '\0';
246				s++;
247				linenum++;
248				return (buf);
249			default:
250				*p++ = *s++;
251			}
252		}
253	}
254	/* NOTREACHED */
255	return (NULL);
256}
257
258/*
259 * Like fgets, but go through the list of files chaining them together.
260 * Set len to the length of the line.
261 */
262int
263mf_fgets(sp, spflag)
264	SPACE *sp;
265	enum e_spflag spflag;
266{
267	static FILE *f;		/* Current open file */
268	size_t len;
269	char *p;
270	int c;
271
272	if (f == NULL)
273		/* Advance to first non-empty file */
274		for (;;) {
275			if (files == NULL) {
276				lastline = 1;
277				return (0);
278			}
279			if (files->fname == NULL) {
280				f = stdin;
281				fname = "stdin";
282			} else {
283				fname = files->fname;
284				if ((f = fopen(fname, "r")) == NULL)
285					err(FATAL, "%s: %s",
286					    fname, strerror(errno));
287			}
288			if ((c = getc(f)) != EOF) {
289				(void)ungetc(c, f);
290				break;
291			}
292			(void)fclose(f);
293			files = files->next;
294		}
295
296	if (lastline) {
297		sp->len = 0;
298		return (0);
299	}
300
301	/*
302	 * Use fgetln so that we can handle essentially infinite input data.
303	 * Can't use the pointer into the stdio buffer as the process space
304	 * because the ungetc() can cause it to move.
305	 */
306	p = fgetln(f, &len);
307	if (ferror(f))
308		err(FATAL, "%s: %s", fname, strerror(errno ? errno : EIO));
309	cspace(sp, p, len, spflag);
310
311	linenum++;
312	/* Advance to next non-empty file */
313	while ((c = getc(f)) == EOF) {
314		(void)fclose(f);
315		files = files->next;
316		if (files == NULL) {
317			lastline = 1;
318			return (1);
319		}
320		if (files->fname == NULL) {
321			f = stdin;
322			fname = "stdin";
323		} else {
324			fname = files->fname;
325			if ((f = fopen(fname, "r")) == NULL)
326				err(FATAL, "%s: %s", fname, strerror(errno));
327		}
328	}
329	(void)ungetc(c, f);
330	return (1);
331}
332
333/*
334 * Add a compilation unit to the linked list
335 */
336static void
337add_compunit(type, s)
338	enum e_cut type;
339	char *s;
340{
341	struct s_compunit *cu;
342
343	cu = xmalloc(sizeof(struct s_compunit));
344	cu->type = type;
345	cu->s = s;
346	cu->next = NULL;
347	*cu_nextp = cu;
348	cu_nextp = &cu->next;
349}
350
351/*
352 * Add a file to the linked list
353 */
354static void
355add_file(s)
356	char *s;
357{
358	struct s_flist *fp;
359
360	fp = xmalloc(sizeof(struct s_flist));
361	fp->next = NULL;
362	*fl_nextp = fp;
363	fp->fname = s;
364	fl_nextp = &fp->next;
365}
366