main.c revision 1.10 
1/*	$NetBSD: main.c,v 1.10 1997/10/19 23:05:14 lukem 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 1.10 1997/10/19 23:05:14 lukem 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;
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:n")) != -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		default:
137		case '?':
138			(void)fprintf(stderr,
139"usage:\tsed script [-an] [file ...]\n\tsed [-an] [-e script] ... [-f script_file] ... [file ...]\n");
140			exit(1);
141		}
142	argc -= optind;
143	argv += optind;
144
145	/* First usage case; script is the first arg */
146	if (!eflag && !fflag && *argv) {
147		add_compunit(CU_STRING, *argv);
148		argv++;
149	}
150
151	compile();
152
153	/* Continue with first and start second usage */
154	if (*argv)
155		for (; *argv; argv++)
156			add_file(*argv);
157	else
158		add_file(NULL);
159	process();
160	cfclose(prog, NULL);
161	if (fclose(stdout))
162		err(FATAL, "stdout: %s", strerror(errno));
163	exit (0);
164}
165
166/*
167 * Like fgets, but go through the chain of compilation units chaining them
168 * together.  Empty strings and files are ignored.
169 */
170char *
171cu_fgets(buf, n)
172	char *buf;
173	int n;
174{
175	static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
176	static FILE *f;		/* Current open file */
177	static char *s;		/* Current pointer inside string */
178	static char string_ident[30];
179	char *p;
180
181again:
182	switch (state) {
183	case ST_EOF:
184		if (script == NULL)
185			return (NULL);
186		linenum = 0;
187		switch (script->type) {
188		case CU_FILE:
189			if ((f = fopen(script->s, "r")) == NULL)
190				err(FATAL,
191				    "%s: %s", script->s, strerror(errno));
192			fname = script->s;
193			state = ST_FILE;
194			goto again;
195		case CU_STRING:
196			if ((snprintf(string_ident,
197			    sizeof(string_ident), "\"%s\"", script->s)) >=
198			    sizeof(string_ident) - 1)
199				(void)strcpy(string_ident +
200				    sizeof(string_ident) - 6, " ...\"");
201			fname = string_ident;
202			s = script->s;
203			state = ST_STRING;
204			goto again;
205		}
206	case ST_FILE:
207		if ((p = fgets(buf, n, f)) != NULL) {
208			linenum++;
209			if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
210				nflag = 1;
211			return (p);
212		}
213		script = script->next;
214		(void)fclose(f);
215		state = ST_EOF;
216		goto again;
217	case ST_STRING:
218		if (linenum == 0 && s[0] == '#' && s[1] == 'n')
219			nflag = 1;
220		p = buf;
221		for (;;) {
222			if (n-- <= 1) {
223				*p = '\0';
224				linenum++;
225				return (buf);
226			}
227			switch (*s) {
228			case '\0':
229				state = ST_EOF;
230				if (s == script->s) {
231					script = script->next;
232					goto again;
233				} else {
234					script = script->next;
235					*p = '\0';
236					linenum++;
237					return (buf);
238				}
239			case '\n':
240				*p++ = '\n';
241				*p = '\0';
242				s++;
243				linenum++;
244				return (buf);
245			default:
246				*p++ = *s++;
247			}
248		}
249	}
250	/* NOTREACHED */
251	return (NULL);
252}
253
254/*
255 * Like fgets, but go through the list of files chaining them together.
256 * Set len to the length of the line.
257 */
258int
259mf_fgets(sp, spflag)
260	SPACE *sp;
261	enum e_spflag spflag;
262{
263	static FILE *f;		/* Current open file */
264	size_t len;
265	char *p;
266	int c;
267
268	if (f == NULL)
269		/* Advance to first non-empty file */
270		for (;;) {
271			if (files == NULL) {
272				lastline = 1;
273				return (0);
274			}
275			if (files->fname == NULL) {
276				f = stdin;
277				fname = "stdin";
278			} else {
279				fname = files->fname;
280				if ((f = fopen(fname, "r")) == NULL)
281					err(FATAL, "%s: %s",
282					    fname, strerror(errno));
283			}
284			if ((c = getc(f)) != EOF) {
285				(void)ungetc(c, f);
286				break;
287			}
288			(void)fclose(f);
289			files = files->next;
290		}
291
292	if (lastline) {
293		sp->len = 0;
294		return (0);
295	}
296
297	/*
298	 * Use fgetln so that we can handle essentially infinite input data.
299	 * Can't use the pointer into the stdio buffer as the process space
300	 * because the ungetc() can cause it to move.
301	 */
302	p = fgetln(f, &len);
303	if (ferror(f))
304		err(FATAL, "%s: %s", fname, strerror(errno ? errno : EIO));
305	cspace(sp, p, len, spflag);
306
307	linenum++;
308	/* Advance to next non-empty file */
309	while ((c = getc(f)) == EOF) {
310		(void)fclose(f);
311		files = files->next;
312		if (files == NULL) {
313			lastline = 1;
314			return (1);
315		}
316		if (files->fname == NULL) {
317			f = stdin;
318			fname = "stdin";
319		} else {
320			fname = files->fname;
321			if ((f = fopen(fname, "r")) == NULL)
322				err(FATAL, "%s: %s", fname, strerror(errno));
323		}
324	}
325	(void)ungetc(c, f);
326	return (1);
327}
328
329/*
330 * Add a compilation unit to the linked list
331 */
332static void
333add_compunit(type, s)
334	enum e_cut type;
335	char *s;
336{
337	struct s_compunit *cu;
338
339	cu = xmalloc(sizeof(struct s_compunit));
340	cu->type = type;
341	cu->s = s;
342	cu->next = NULL;
343	*cu_nextp = cu;
344	cu_nextp = &cu->next;
345}
346
347/*
348 * Add a file to the linked list
349 */
350static void
351add_file(s)
352	char *s;
353{
354	struct s_flist *fp;
355
356	fp = xmalloc(sizeof(struct s_flist));
357	fp->next = NULL;
358	*fl_nextp = fp;
359	fp->fname = s;
360	fl_nextp = &fp->next;
361}
362