aboutsummaryrefslogtreecommitdiffstats
path: root/usr.bin/sed/main.c
blob: fcd5e4efdd2b62b87c22a899b7481d7633b15002 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
/*-
 * Copyright (c) 1992 Diomidis Spinellis.
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Diomidis Spinellis of Imperial College, University of London.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1992, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)main.c	8.2 (Berkeley) 1/3/94";
#endif
static const char rcsid[] =
  "$FreeBSD$";
#endif /* not lint */

#include <sys/types.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <locale.h>
#include <regex.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "defs.h"
#include "extern.h"

/*
 * Linked list of units (strings and files) to be compiled
 */
struct s_compunit {
	struct s_compunit *next;
	enum e_cut {CU_FILE, CU_STRING} type;
	char *s;			/* Pointer to string or fname */
};

/*
 * Linked list pointer to compilation units and pointer to current
 * next pointer.
 */
static struct s_compunit *script, **cu_nextp = &script;

/*
 * Linked list of files to be processed
 */
struct s_flist {
	char *fname;
	struct s_flist *next;
};

/*
 * Linked list pointer to files and pointer to current
 * next pointer.
 */
static struct s_flist *files, **fl_nextp = &files;

int aflag, eflag, nflag;

/*
 * Current file and line number; line numbers restart across compilation
 * units, but span across input files.
 */
char *fname;			/* File name. */
u_long linenum;
int lastline;			/* TRUE on the last line of the last file */

static void add_compunit __P((enum e_cut, char *));
static void add_file __P((char *));
static void usage __P((void));

int
main(argc, argv)
	int argc;
	char *argv[];
{
	int c, fflag;
	char *temp_arg;

	(void) setlocale(LC_ALL, "");

	fflag = 0;
	while ((c = getopt(argc, argv, "ae:f:n")) != -1)
		switch (c) {
		case 'a':
			aflag = 1;
			break;
		case 'e':
			eflag = 1;
			temp_arg = xmalloc(strlen(optarg) + 2);
			strcpy(temp_arg, optarg);
			strcat(temp_arg, "\n");
			add_compunit(CU_STRING, temp_arg);
			break;
		case 'f':
			fflag = 1;
			add_compunit(CU_FILE, optarg);
			break;
		case 'n':
			nflag = 1;
			break;
		default:
		case '?':
			usage();
		}
	argc -= optind;
	argv += optind;

	/* First usage case; script is the first arg */
	if (!eflag && !fflag && *argv) {
		add_compunit(CU_STRING, *argv);
		argv++;
	}

	compile();

	/* Continue with first and start second usage */
	if (*argv)
		for (; *argv; argv++)
			add_file(*argv);
	else
		add_file(NULL);
	process();
	cfclose(prog, NULL);
	if (fclose(stdout))
		err(1, "stdout");
	exit (0);
}

static void
usage()
{
	(void)fprintf(stderr, "%s\n%s\n",
		"usage: sed script [-an] [file ...]",
		"       sed [-an] [-e script] ... [-f script_file] ... [file ...]");
	exit(1);
}

/*
 * Like fgets, but go through the chain of compilation units chaining them
 * together.  Empty strings and files are ignored.
 */
char *
cu_fgets(buf, n, more)
	char *buf;
	int n;
	int *more;
{
	static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
	static FILE *f;		/* Current open file */
	static char *s;		/* Current pointer inside string */
	static char string_ident[30];
	char *p;

again:
	switch (state) {
	case ST_EOF:
		if (script == NULL) {
			if (more != NULL)
				*more = 0;
			return (NULL);
		}
		linenum = 0;
		switch (script->type) {
		case CU_FILE:
			if ((f = fopen(script->s, "r")) == NULL)
				err(1, "%s", script->s);
			fname = script->s;
			state = ST_FILE;
			goto again;
		case CU_STRING:
			if ((snprintf(string_ident,
			    sizeof(string_ident), "\"%s\"", script->s)) >=
			    sizeof(string_ident) - 1)
				(void)strcpy(string_ident +
				    sizeof(string_ident) - 6, " ...\"");
			fname = string_ident;
			s = script->s;
			state = ST_STRING;
			goto again;
		}
	case ST_FILE:
		if ((p = fgets(buf, n, f)) != NULL) {
			linenum++;
			if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
				nflag = 1;
			if (more != NULL)
				*more = !feof(f);
			return (p);
		}
		script = script->next;
		(void)fclose(f);
		state = ST_EOF;
		goto again;
	case ST_STRING:
		if (linenum == 0 && s[0] == '#' && s[1] == 'n')
			nflag = 1;
		p = buf;
		for (;;) {
			if (n-- <= 1) {
				*p = '\0';
				linenum++;
				if (more != NULL)
					*more = 1;
				return (buf);
			}
			switch (*s) {
			case '\0':
				state = ST_EOF;
				if (s == script->s) {
					script = script->next;
					goto again;
				} else {
					script = script->next;
					*p = '\0';
					linenum++;
					if (more != NULL)
						*more = 0;
					return (buf);
				}
			case '\n':
				*p++ = '\n';
				*p = '\0';
				s++;
				linenum++;
				if (more != NULL)
					*more = 0;
				return (buf);
			default:
				*p++ = *s++;
			}
		}
	}
	/* NOTREACHED */
	return (NULL);
}

/*
 * Like fgets, but go through the list of files chaining them together.
 * Set len to the length of the line.
 */
int
mf_fgets(sp, spflag)
	SPACE *sp;
	enum e_spflag spflag;
{
	static FILE *f;		/* Current open file */
	size_t len;
	char *p;
	int c;

	if (f == NULL)
		/* Advance to first non-empty file */
		for (;;) {
			if (files == NULL) {
				lastline = 1;
				return (0);
			}
			if (files->fname == NULL) {
				f = stdin;
				fname = "stdin";
			} else {
				fname = files->fname;
				if ((f = fopen(fname, "r")) == NULL)
					err(1, "%s", fname);
			}
			if ((c = getc(f)) != EOF) {
				(void)ungetc(c, f);
				break;
			}
			(void)fclose(f);
			files = files->next;
		}

	if (lastline) {
		sp->len = 0;
		return (0);
	}

	/*
	 * Use fgetln so that we can handle essentially infinite input data.
	 * Can't use the pointer into the stdio buffer as the process space
	 * because the ungetc() can cause it to move.
	 */
	p = fgetln(f, &len);
	if (ferror(f))
		errx(1, "%s: %s", fname, strerror(errno ? errno : EIO));
	cspace(sp, p, len, spflag);

	linenum++;
	/* Advance to next non-empty file */
	while ((c = getc(f)) == EOF) {
		(void)fclose(f);
		files = files->next;
		if (files == NULL) {
			lastline = 1;
			return (1);
		}
		if (files->fname == NULL) {
			f = stdin;
			fname = "stdin";
		} else {
			fname = files->fname;
			if ((f = fopen(fname, "r")) == NULL)
				err(1, "%s", fname);
		}
	}
	(void)ungetc(c, f);
	return (1);
}

/*
 * Add a compilation unit to the linked list
 */
static void
add_compunit(type, s)
	enum e_cut type;
	char *s;
{
	struct s_compunit *cu;

	cu = xmalloc(sizeof(struct s_compunit));
	cu->type = type;
	cu->s = s;
	cu->next = NULL;
	*cu_nextp = cu;
	cu_nextp = &cu->next;
}

/*
 * Add a file to the linked list
 */
static void
add_file(s)
	char *s;
{
	struct s_flist *fp;

	fp = xmalloc(sizeof(struct s_flist));
	fp->next = NULL;
	*fl_nextp = fp;
	fp->fname = s;
	fl_nextp = &fp->next;
}