[unix-history] / usr.bin / sed / main.c

/*-
 * Copyright (c) 1992 Diomidis Spinellis.
 * Copyright (c) 1992 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
char copyright[] =
"@(#) Copyright (c) 1992 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)main.c	5.6 (Berkeley) 8/30/92";
#endif /* not lint */

#include <sys/types.h>

#include <ctype.h>
#include <errno.h>
#include <fcntl.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 *));

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

	fflag = 0;
	while ((c = getopt(argc, argv, "ae:f:n")) != EOF)
		switch (c) {
		case 'a':
			aflag = 1;
			break;
		case 'e':
			eflag = 1;
			add_compunit(CU_STRING, optarg);
			break;
		case 'f':
			fflag = 1;
			add_compunit(CU_FILE, optarg);
			break;
		case 'n':
			nflag = 1;
			break;
		default:
		case '?':
			(void)fprintf(stderr,
"usage:\tsed script [-an] [file ...]\n\tsed [-an] [-e script] ... [-f scipt_file] ... [file ...]\n");
			exit(1);
		}
	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(FATAL, "stdout: %s", strerror(errno));
	exit (0);
}

/*
 * Like fgets, but go through the chain of compilation units chaining them
 * together.  Empty strings and files are ignored.
 */
char *
cu_fgets(buf, n)
	char *buf;
	int n;
{
	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)
			return (NULL);
		linenum = 0;
		switch (script->type) {
		case CU_FILE:
			if ((f = fopen(script->s, "r")) == NULL)
				err(FATAL,
				    "%s: %s", script->s, strerror(errno));
			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;
			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++;
				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++;
					return (buf);
				}
			case '\n':
				*p++ = '\n';
				*p = '\0';
				s++;
				linenum++;
				return (buf);
			default:
				*p++ = *s++;
			}
		}
	}
	/* NOTREACHED */
}

/*
 * 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 c, *p;

	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(FATAL, "%s: %s",
					    fname, strerror(errno));
			}
			if ((c = getc(f)) != EOF) {
				(void)ungetc(c, f);
				break;
			}
			(void)fclose(f);
			files = files->next;
		}

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

	/*
	 * Use fgetline 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 = fgetline(f, &len);
	if (ferror(f))
		err(FATAL, "%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(FATAL, "%s: %s", fname, strerror(errno));
		}
	}
	(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;
}
Commit	Line	Data
c2199a45 AM	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
	39	char 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[] = "@(#)main.c 5.6 (Berkeley) 8/30/92";
	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	*/
66	struct 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	*/
76	static struct s_compunit script, *cu_nextp = &script;
77
78	/*
79	* Linked list of files to be processed
80	*/
81	struct 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	*/
90	static struct s_flist files, *fl_nextp = &files;
91
92	int aflag, eflag, nflag;
93
94	/*
95	* Current file and line number; line numbers restart across compilation
96	* units, but span across input files.
97	*/
98	char fname; / File name. */
99	u_long linenum;
100	int lastline; /* TRUE on the last line of the last file */
101
102	static void add_compunit __P((enum e_cut, char *));
103	static void add_file __P((char *));
104
105	int
106	main(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	*/
163	char *
164	cu_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
174	again:
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	*/
250	int
251	mf_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 fgetline so that we can handle essentially infinite input
290	* data. Can't use the pointer into the stdio buffer as the process
291	* space because the ungetc() can cause it to move.
292	*/
293	p = fgetline(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	*/
323	static void
324	add_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	*/
341	static void
342	add_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	}