1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2013 Johann 'Myrkraverk' Oskarsson.
5 * Copyright (c) 1992 Diomidis Spinellis.
6 * Copyright (c) 1992, 1993
7 *	The Regents of the University of California.  All rights reserved.
8 *
9 * This code is derived from software contributed to Berkeley by
10 * Diomidis Spinellis of Imperial College, University of London.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD$");
39
40#ifndef lint
41static const char copyright[] =
42"@(#) Copyright (c) 1992, 1993\n\
43	The Regents of the University of California.  All rights reserved.\n";
44#endif
45
46#ifndef lint
47static const char sccsid[] = "@(#)main.c	8.2 (Berkeley) 1/3/94";
48#endif
49
50#include <sys/types.h>
51#include <sys/mman.h>
52#include <sys/param.h>
53#include <sys/stat.h>
54
55#include <err.h>
56#include <errno.h>
57#include <fcntl.h>
58#include <libgen.h>
59#include <limits.h>
60#include <locale.h>
61#include <regex.h>
62#include <stddef.h>
63#include <stdio.h>
64#include <stdlib.h>
65#include <string.h>
66#include <unistd.h>
67
68#include "defs.h"
69#include "extern.h"
70
71/*
72 * Linked list of units (strings and files) to be compiled
73 */
74struct s_compunit {
75	struct s_compunit *next;
76	enum e_cut {CU_FILE, CU_STRING} type;
77	char *s;			/* Pointer to string or fname */
78};
79
80/*
81 * Linked list pointer to compilation units and pointer to current
82 * next pointer.
83 */
84static struct s_compunit *script, **cu_nextp = &script;
85
86/*
87 * Linked list of files to be processed
88 */
89struct s_flist {
90	char *fname;
91	struct s_flist *next;
92};
93
94/*
95 * Linked list pointer to files and pointer to current
96 * next pointer.
97 */
98static struct s_flist *files, **fl_nextp = &files;
99
100FILE *infile;			/* Current input file */
101FILE *outfile;			/* Current output file */
102
103int aflag, eflag, nflag;
104int rflags = 0;
105int quit = 0;
106static int rval;		/* Exit status */
107
108static int ispan;		/* Whether inplace editing spans across files */
109
110/*
111 * Current file and line number; line numbers restart across compilation
112 * units, but span across input files.  The latter is optional if editing
113 * in place.
114 */
115const char *fname;		/* File name. */
116const char *outfname;		/* Output file name */
117static char oldfname[PATH_MAX];	/* Old file name (for in-place editing) */
118static char tmpfname[PATH_MAX];	/* Temporary file name (for in-place editing) */
119const char *inplace;		/* Inplace edit file extension. */
120u_long linenum;
121
122static void add_compunit(enum e_cut, char *);
123static void add_file(char *);
124static void usage(void);
125
126int
127main(int argc, char *argv[])
128{
129	int c, fflag, fflagstdin;
130	char *temp_arg;
131
132	(void) setlocale(LC_ALL, "");
133
134	fflag = 0;
135	fflagstdin = 0;
136	inplace = NULL;
137
138	while ((c = getopt(argc, argv, "EI:ae:f:i:lnru")) != -1)
139		switch (c) {
140		case 'r':		/* Gnu sed compat */
141		case 'E':
142			rflags = REG_EXTENDED;
143			break;
144		case 'I':
145			inplace = optarg;
146			ispan = 1;	/* span across input files */
147			break;
148		case 'a':
149			aflag = 1;
150			break;
151		case 'e':
152			eflag = 1;
153			if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL)
154				err(1, "malloc");
155			strcpy(temp_arg, optarg);
156			strcat(temp_arg, "\n");
157			add_compunit(CU_STRING, temp_arg);
158			break;
159		case 'f':
160			fflag = 1;
161			if (strcmp(optarg, "-") == 0)
162				fflagstdin = 1;
163			add_compunit(CU_FILE, optarg);
164			break;
165		case 'i':
166			inplace = optarg;
167			ispan = 0;	/* don't span across input files */
168			break;
169		case 'l':
170			if(setvbuf(stdout, NULL, _IOLBF, 0) != 0)
171				warnx("setting line buffered output failed");
172			break;
173		case 'n':
174			nflag = 1;
175			break;
176		case 'u':
177			if(setvbuf(stdout, NULL, _IONBF, 0) != 0)
178				warnx("setting unbuffered output failed");
179			break;
180		default:
181		case '?':
182			usage();
183		}
184	argc -= optind;
185	argv += optind;
186
187	/* First usage case; script is the first arg */
188	if (!eflag && !fflag && *argv) {
189		add_compunit(CU_STRING, *argv);
190		argv++;
191	}
192
193	compile();
194
195	/* Continue with first and start second usage */
196	if (*argv)
197		for (; *argv; argv++)
198			add_file(*argv);
199	else if (fflagstdin)
200		exit(rval);
201	else
202		add_file(NULL);
203	process();
204	cfclose(prog, NULL);
205	if (fclose(stdout))
206		err(1, "stdout");
207	exit(rval);
208}
209
210static void
211usage(void)
212{
213	(void)fprintf(stderr,
214	    "usage: %s script [-Ealnru] [-i extension] [file ...]\n"
215	    "\t%s [-Ealnu] [-i extension] [-e script] ... [-f script_file]"
216	    " ... [file ...]\n", getprogname(), getprogname());
217	exit(1);
218}
219
220/*
221 * Like fgets, but go through the chain of compilation units chaining them
222 * together.  Empty strings and files are ignored.
223 */
224char *
225cu_fgets(char *buf, int n, int *more)
226{
227	static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
228	static FILE *f;		/* Current open file */
229	static char *s;		/* Current pointer inside string */
230	static char string_ident[30];
231	char *p;
232
233again:
234	switch (state) {
235	case ST_EOF:
236		if (script == NULL) {
237			if (more != NULL)
238				*more = 0;
239			return (NULL);
240		}
241		linenum = 0;
242		switch (script->type) {
243		case CU_FILE:
244			if (strcmp(script->s, "-") == 0) {
245				f = stdin;
246				fname = "stdin";
247			} else {
248				if ((f = fopen(script->s, "r")) == NULL)
249				        err(1, "%s", script->s);
250				fname = script->s;
251			}
252			state = ST_FILE;
253			goto again;
254		case CU_STRING:
255			if (((size_t)snprintf(string_ident,
256			    sizeof(string_ident), "\"%s\"", script->s)) >=
257			    sizeof(string_ident) - 1)
258				(void)strcpy(string_ident +
259				    sizeof(string_ident) - 6, " ...\"");
260			fname = string_ident;
261			s = script->s;
262			state = ST_STRING;
263			goto again;
264		default:
265			__unreachable();
266		}
267	case ST_FILE:
268		if ((p = fgets(buf, n, f)) != NULL) {
269			linenum++;
270			if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
271				nflag = 1;
272			if (more != NULL)
273				*more = !feof(f);
274			return (p);
275		}
276		script = script->next;
277		(void)fclose(f);
278		state = ST_EOF;
279		goto again;
280	case ST_STRING:
281		if (linenum == 0 && s[0] == '#' && s[1] == 'n')
282			nflag = 1;
283		p = buf;
284		for (;;) {
285			if (n-- <= 1) {
286				*p = '\0';
287				linenum++;
288				if (more != NULL)
289					*more = 1;
290				return (buf);
291			}
292			switch (*s) {
293			case '\0':
294				state = ST_EOF;
295				if (s == script->s) {
296					script = script->next;
297					goto again;
298				} else {
299					script = script->next;
300					*p = '\0';
301					linenum++;
302					if (more != NULL)
303						*more = 0;
304					return (buf);
305				}
306			case '\n':
307				*p++ = '\n';
308				*p = '\0';
309				s++;
310				linenum++;
311				if (more != NULL)
312					*more = 0;
313				return (buf);
314			default:
315				*p++ = *s++;
316			}
317		}
318	}
319	/* NOTREACHED */
320	return (NULL);
321}
322
323/*
324 * Like fgets, but go through the list of files chaining them together.
325 * Set len to the length of the line.
326 */
327int
328mf_fgets(SPACE *sp, enum e_spflag spflag)
329{
330	struct stat sb;
331	ssize_t len;
332	char *dirbuf, *basebuf;
333	static char *p = NULL;
334	static size_t plen = 0;
335	int c;
336	static int firstfile;
337
338	if (infile == NULL) {
339		/* stdin? */
340		if (files->fname == NULL) {
341			if (inplace != NULL)
342				errx(1, "-I or -i may not be used with stdin");
343			infile = stdin;
344			fname = "stdin";
345			outfile = stdout;
346			outfname = "stdout";
347		}
348		firstfile = 1;
349	}
350
351	for (;;) {
352		if (infile != NULL && (c = getc(infile)) != EOF && !quit) {
353			(void)ungetc(c, infile);
354			break;
355		}
356		/* If we are here then either eof or no files are open yet */
357		if (infile == stdin) {
358			sp->len = 0;
359			return (0);
360		}
361		if (infile != NULL) {
362			fclose(infile);
363			if (*oldfname != '\0') {
364				/* if there was a backup file, remove it */
365				unlink(oldfname);
366				/*
367				 * Backup the original.  Note that hard links
368				 * are not supported on all filesystems.
369				 */
370				if ((link(fname, oldfname) != 0) &&
371				   (rename(fname, oldfname) != 0)) {
372					warn("rename()");
373					if (*tmpfname)
374						unlink(tmpfname);
375					exit(1);
376				}
377				*oldfname = '\0';
378			}
379			if (*tmpfname != '\0') {
380				if (outfile != NULL && outfile != stdout)
381					if (fclose(outfile) != 0) {
382						warn("fclose()");
383						unlink(tmpfname);
384						exit(1);
385					}
386				outfile = NULL;
387				if (rename(tmpfname, fname) != 0) {
388					/* this should not happen really! */
389					warn("rename()");
390					unlink(tmpfname);
391					exit(1);
392				}
393				*tmpfname = '\0';
394			}
395			outfname = NULL;
396		}
397		if (firstfile == 0)
398			files = files->next;
399		else
400			firstfile = 0;
401		if (files == NULL) {
402			sp->len = 0;
403			return (0);
404		}
405		fname = files->fname;
406		if (inplace != NULL) {
407			if (lstat(fname, &sb) != 0)
408				err(1, "%s", fname);
409			if (!S_ISREG(sb.st_mode))
410				errx(1, "%s: %s %s", fname,
411				    "in-place editing only",
412				    "works for regular files");
413			if (*inplace != '\0') {
414				strlcpy(oldfname, fname,
415				    sizeof(oldfname));
416				len = strlcat(oldfname, inplace,
417				    sizeof(oldfname));
418				if (len > (ssize_t)sizeof(oldfname))
419					errx(1, "%s: name too long", fname);
420			}
421			if ((dirbuf = strdup(fname)) == NULL ||
422			    (basebuf = strdup(fname)) == NULL)
423				err(1, "strdup");
424			len = snprintf(tmpfname, sizeof(tmpfname),
425			    "%s/.!%ld!%s", dirname(dirbuf), (long)getpid(),
426			    basename(basebuf));
427			free(dirbuf);
428			free(basebuf);
429			if (len >= (ssize_t)sizeof(tmpfname))
430				errx(1, "%s: name too long", fname);
431			unlink(tmpfname);
432			if (outfile != NULL && outfile != stdout)
433				fclose(outfile);
434			if ((outfile = fopen(tmpfname, "w")) == NULL)
435				err(1, "%s", fname);
436			fchown(fileno(outfile), sb.st_uid, sb.st_gid);
437			fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
438			outfname = tmpfname;
439			if (!ispan) {
440				linenum = 0;
441				resetstate();
442			}
443		} else {
444			outfile = stdout;
445			outfname = "stdout";
446		}
447		if ((infile = fopen(fname, "r")) == NULL) {
448			warn("%s", fname);
449			rval = 1;
450			continue;
451		}
452	}
453	/*
454	 * We are here only when infile is open and we still have something
455	 * to read from it.
456	 *
457	 * Use getline() so that we can handle essentially infinite input
458	 * data.  The p and plen are static so each invocation gives
459	 * getline() the same buffer which is expanded as needed.
460	 */
461	len = getline(&p, &plen, infile);
462	if (len == -1)
463		err(1, "%s", fname);
464	if (len != 0 && p[len - 1] == '\n') {
465		sp->append_newline = 1;
466		len--;
467	} else if (!lastline()) {
468		sp->append_newline = 1;
469	} else {
470		sp->append_newline = 0;
471	}
472	cspace(sp, p, len, spflag);
473
474	linenum++;
475
476	return (1);
477}
478
479/*
480 * Add a compilation unit to the linked list
481 */
482static void
483add_compunit(enum e_cut type, char *s)
484{
485	struct s_compunit *cu;
486
487	if ((cu = malloc(sizeof(struct s_compunit))) == NULL)
488		err(1, "malloc");
489	cu->type = type;
490	cu->s = s;
491	cu->next = NULL;
492	*cu_nextp = cu;
493	cu_nextp = &cu->next;
494}
495
496/*
497 * Add a file to the linked list
498 */
499static void
500add_file(char *s)
501{
502	struct s_flist *fp;
503
504	if ((fp = malloc(sizeof(struct s_flist))) == NULL)
505		err(1, "malloc");
506	fp->next = NULL;
507	*fl_nextp = fp;
508	fp->fname = s;
509	fl_nextp = &fp->next;
510}
511
512static int
513next_files_have_lines(void)
514{
515	struct s_flist *file;
516	FILE *file_fd;
517	int ch;
518
519	file = files;
520	while ((file = file->next) != NULL) {
521		if ((file_fd = fopen(file->fname, "r")) == NULL)
522			continue;
523
524		if ((ch = getc(file_fd)) != EOF) {
525			/*
526			 * This next file has content, therefore current
527			 * file doesn't contains the last line.
528			 */
529			ungetc(ch, file_fd);
530			fclose(file_fd);
531			return (1);
532		}
533
534		fclose(file_fd);
535	}
536
537	return (0);
538}
539
540int
541lastline(void)
542{
543	int ch;
544
545	if (feof(infile)) {
546		return !(
547		    (inplace == NULL || ispan) &&
548		    next_files_have_lines());
549	}
550	if ((ch = getc(infile)) == EOF) {
551		return !(
552		    (inplace == NULL || ispan) &&
553		    next_files_have_lines());
554	}
555	ungetc(ch, infile);
556	return (0);
557}
558