main.c revision 1.3 
1/*-
2 * Copyright (c) 1992 Diomidis Spinellis.
3 * Copyright (c) 1992 The Regents of the University of California.
4 * 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
39char copyright[] =
40"@(#) Copyright (c) 1992 The Regents of the University of California.\n\
41 All rights reserved.\n";
42#endif /* not lint */
43
44#ifndef lint
45/*static char sccsid[] = "from: @(#)main.c	5.6 (Berkeley) 8/30/92";*/
46static char rcsid[] = "$Id: main.c,v 1.3 1993/12/22 07:38:51 cgd Exp $";
47#endif /* not lint */
48
49#include <sys/types.h>
50
51#include <ctype.h>
52#include <errno.h>
53#include <fcntl.h>
54#include <regex.h>
55#include <stddef.h>
56#include <stdio.h>
57#include <stdlib.h>
58#include <string.h>
59#include <unistd.h>
60
61#include "defs.h"
62#include "extern.h"
63
64/*
65 * Linked list of units (strings and files) to be compiled
66 */
67struct s_compunit {
68	struct s_compunit *next;
69	enum e_cut {CU_FILE, CU_STRING} type;
70	char *s;			/* Pointer to string or fname */
71};
72
73/*
74 * Linked list pointer to compilation units and pointer to current
75 * next pointer.
76 */
77static struct s_compunit *script, **cu_nextp = &script;
78
79/*
80 * Linked list of files to be processed
81 */
82struct s_flist {
83	char *fname;
84	struct s_flist *next;
85};
86
87/*
88 * Linked list pointer to files and pointer to current
89 * next pointer.
90 */
91static struct s_flist *files, **fl_nextp = &files;
92
93int aflag, eflag, nflag;
94
95/*
96 * Current file and line number; line numbers restart across compilation
97 * units, but span across input files.
98 */
99char *fname;			/* File name. */
100u_long linenum;
101int lastline;			/* TRUE on the last line of the last file */
102
103static void add_compunit __P((enum e_cut, char *));
104static void add_file __P((char *));
105
106int
107main(argc, argv)
108	int argc;
109	char *argv[];
110{
111	int c, fflag;
112
113	fflag = 0;
114	while ((c = getopt(argc, argv, "ae:f:n")) != EOF)
115		switch (c) {
116		case 'a':
117			aflag = 1;
118			break;
119		case 'e':
120			eflag = 1;
121			add_compunit(CU_STRING, optarg);
122			break;
123		case 'f':
124			fflag = 1;
125			add_compunit(CU_FILE, optarg);
126			break;
127		case 'n':
128			nflag = 1;
129			break;
130		default:
131		case '?':
132			(void)fprintf(stderr,
133"usage:\tsed script [-an] [file ...]\n\tsed [-an] [-e script] ... [-f scipt_file] ... [file ...]\n");
134			exit(1);
135		}
136	argc -= optind;
137	argv += optind;
138
139	/* First usage case; script is the first arg */
140	if (!eflag && !fflag && *argv) {
141		add_compunit(CU_STRING, *argv);
142		argv++;
143	}
144
145	compile();
146
147	/* Continue with first and start second usage */
148	if (*argv)
149		for (; *argv; argv++)
150			add_file(*argv);
151	else
152		add_file(NULL);
153	process();
154	cfclose(prog, NULL);
155	if (fclose(stdout))
156		err(FATAL, "stdout: %s", strerror(errno));
157	exit (0);
158}
159
160/*
161 * Like fgets, but go through the chain of compilation units chaining them
162 * together.  Empty strings and files are ignored.
163 */
164char *
165cu_fgets(buf, n)
166	char *buf;
167	int n;
168{
169	static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
170	static FILE *f;		/* Current open file */
171	static char *s;		/* Current pointer inside string */
172	static char string_ident[30];
173	char *p;
174
175again:
176	switch (state) {
177	case ST_EOF:
178		if (script == NULL)
179			return (NULL);
180		linenum = 0;
181		switch (script->type) {
182		case CU_FILE:
183			if ((f = fopen(script->s, "r")) == NULL)
184				err(FATAL,
185				    "%s: %s", script->s, strerror(errno));
186			fname = script->s;
187			state = ST_FILE;
188			goto again;
189		case CU_STRING:
190			if ((snprintf(string_ident,
191			    sizeof(string_ident), "\"%s\"", script->s)) >=
192			    sizeof(string_ident) - 1)
193				(void)strcpy(string_ident +
194				    sizeof(string_ident) - 6, " ...\"");
195			fname = string_ident;
196			s = script->s;
197			state = ST_STRING;
198			goto again;
199		}
200	case ST_FILE:
201		if ((p = fgets(buf, n, f)) != NULL) {
202			linenum++;
203			if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
204				nflag = 1;
205			return (p);
206		}
207		script = script->next;
208		(void)fclose(f);
209		state = ST_EOF;
210		goto again;
211	case ST_STRING:
212		if (linenum == 0 && s[0] == '#' && s[1] == 'n')
213			nflag = 1;
214		p = buf;
215		for (;;) {
216			if (n-- <= 1) {
217				*p = '\0';
218				linenum++;
219				return (buf);
220			}
221			switch (*s) {
222			case '\0':
223				state = ST_EOF;
224				if (s == script->s) {
225					script = script->next;
226					goto again;
227				} else {
228					script = script->next;
229					*p = '\0';
230					linenum++;
231					return (buf);
232				}
233			case '\n':
234				*p++ = '\n';
235				*p = '\0';
236				s++;
237				linenum++;
238				return (buf);
239			default:
240				*p++ = *s++;
241			}
242		}
243	}
244	/* NOTREACHED */
245}
246
247/*
248 * Like fgets, but go through the list of files chaining them together.
249 * Set len to the length of the line.
250 */
251int
252mf_fgets(sp, spflag)
253	SPACE *sp;
254	enum e_spflag spflag;
255{
256	static FILE *f;		/* Current open file */
257	size_t len;
258	char c, *p;
259
260	if (f == NULL)
261		/* Advance to first non-empty file */
262		for (;;) {
263			if (files == NULL) {
264				lastline = 1;
265				return (0);
266			}
267			if (files->fname == NULL) {
268				f = stdin;
269				fname = "stdin";
270			} else {
271				fname = files->fname;
272				if ((f = fopen(fname, "r")) == NULL)
273					err(FATAL, "%s: %s",
274					    fname, strerror(errno));
275			}
276			if ((c = getc(f)) != EOF) {
277				(void)ungetc(c, 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 fgetline so that we can handle essentially infinite input
291	 * data.  Can't use the pointer into the stdio buffer as the process
292	 * space because the ungetc() can cause it to move.
293	 */
294	p = fgetline(f, &len);
295	if (ferror(f))
296		err(FATAL, "%s: %s", fname, strerror(errno ? errno : EIO));
297	if (p[len-1] == '\n')
298		p[--len] = '\0';
299	cspace(sp, p, len, spflag);
300
301	linenum++;
302	/* Advance to next non-empty file */
303	while ((c = getc(f)) == EOF) {
304		(void)fclose(f);
305		files = files->next;
306		if (files == NULL) {
307			lastline = 1;
308			return (1);
309		}
310		if (files->fname == NULL) {
311			f = stdin;
312			fname = "stdin";
313		} else {
314			fname = files->fname;
315			if ((f = fopen(fname, "r")) == NULL)
316				err(FATAL, "%s: %s", fname, strerror(errno));
317		}
318	}
319	(void)ungetc(c, f);
320	return (1);
321}
322
323/*
324 * Add a compilation unit to the linked list
325 */
326static void
327add_compunit(type, s)
328	enum e_cut type;
329	char *s;
330{
331	struct s_compunit *cu;
332
333	cu = xmalloc(sizeof(struct s_compunit));
334	cu->type = type;
335	cu->s = s;
336	cu->next = NULL;
337	*cu_nextp = cu;
338	cu_nextp = &cu->next;
339}
340
341/*
342 * Add a file to the linked list
343 */
344static void
345add_file(s)
346	char *s;
347{
348	struct s_flist *fp;
349
350	fp = xmalloc(sizeof(struct s_flist));
351	fp->next = NULL;
352	*fl_nextp = fp;
353	fp->fname = s;
354	fl_nextp = &fp->next;
355}
356