1/*	$OpenBSD: cat.c,v 1.34 2022/02/09 01:58:57 cheloha Exp $	*/
2/*	$NetBSD: cat.c,v 1.11 1995/09/07 06:12:54 jtc Exp $	*/
3
4/*
5 * Copyright (c) 1989, 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 * Kevin Fall.
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. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/types.h>
37#include <sys/stat.h>
38
39#include <ctype.h>
40#include <err.h>
41#include <errno.h>
42#include <fcntl.h>
43#include <stdio.h>
44#include <stdlib.h>
45#include <string.h>
46#include <unistd.h>
47
48#define MAXIMUM(a, b)	(((a) > (b)) ? (a) : (b))
49
50int bflag, eflag, nflag, sflag, tflag, vflag;
51int rval;
52
53void cat_file(const char *);
54void cook_buf(FILE *, const char *);
55void raw_cat(int, const char *);
56
57int
58main(int argc, char *argv[])
59{
60	int ch;
61
62	if (pledge("stdio rpath", NULL) == -1)
63		err(1, "pledge");
64
65	while ((ch = getopt(argc, argv, "benstuv")) != -1) {
66		switch (ch) {
67		case 'b':
68			bflag = nflag = 1;	/* -b implies -n */
69			break;
70		case 'e':
71			eflag = vflag = 1;	/* -e implies -v */
72			break;
73		case 'n':
74			nflag = 1;
75			break;
76		case 's':
77			sflag = 1;
78			break;
79		case 't':
80			tflag = vflag = 1;	/* -t implies -v */
81			break;
82		case 'u':
83			setvbuf(stdout, NULL, _IONBF, 0);
84			break;
85		case 'v':
86			vflag = 1;
87			break;
88		default:
89			fprintf(stderr, "usage: %s [-benstuv] [file ...]\n",
90			    getprogname());
91			return 1;
92		}
93	}
94	argc -= optind;
95	argv += optind;
96
97	if (argc == 0) {
98		if (pledge("stdio", NULL) == -1)
99			err(1, "pledge");
100
101		cat_file(NULL);
102	} else {
103		for (; *argv != NULL; argv++)
104			cat_file(*argv);
105	}
106	if (fclose(stdout))
107		err(1, "stdout");
108	return rval;
109}
110
111void
112cat_file(const char *path)
113{
114	FILE *fp;
115	int fd;
116
117	if (bflag || eflag || nflag || sflag || tflag || vflag) {
118		if (path == NULL || strcmp(path, "-") == 0) {
119			cook_buf(stdin, "stdin");
120			clearerr(stdin);
121		} else {
122			if ((fp = fopen(path, "r")) == NULL) {
123				warn("%s", path);
124				rval = 1;
125				return;
126			}
127			cook_buf(fp, path);
128			fclose(fp);
129		}
130	} else {
131		if (path == NULL || strcmp(path, "-") == 0) {
132			raw_cat(STDIN_FILENO, "stdin");
133		} else {
134			if ((fd = open(path, O_RDONLY)) == -1) {
135				warn("%s", path);
136				rval = 1;
137				return;
138			}
139			raw_cat(fd, path);
140			close(fd);
141		}
142	}
143}
144
145void
146cook_buf(FILE *fp, const char *filename)
147{
148	unsigned long long line;
149	int ch, gobble, prev;
150
151	line = gobble = 0;
152	for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
153		if (prev == '\n') {
154			if (sflag) {
155				if (ch == '\n') {
156					if (gobble)
157						continue;
158					gobble = 1;
159				} else
160					gobble = 0;
161			}
162			if (nflag) {
163				if (!bflag || ch != '\n') {
164					fprintf(stdout, "%6llu\t", ++line);
165					if (ferror(stdout))
166						break;
167				} else if (eflag) {
168					(void)fprintf(stdout, "%6s\t", "");
169					if (ferror(stdout))
170						break;
171				}
172			}
173		}
174		if (ch == '\n') {
175			if (eflag && putchar('$') == EOF)
176				break;
177		} else if (ch == '\t') {
178			if (tflag) {
179				if (putchar('^') == EOF || putchar('I') == EOF)
180					break;
181				continue;
182			}
183		} else if (vflag) {
184			if (!isascii(ch)) {
185				if (putchar('M') == EOF || putchar('-') == EOF)
186					break;
187				ch = toascii(ch);
188			}
189			if (iscntrl(ch)) {
190				if (putchar('^') == EOF ||
191				    putchar(ch == '\177' ? '?' :
192				    ch | 0100) == EOF)
193					break;
194				continue;
195			}
196		}
197		if (putchar(ch) == EOF)
198			break;
199	}
200	if (ferror(fp)) {
201		warn("%s", filename);
202		rval = 1;
203		clearerr(fp);
204	}
205	if (ferror(stdout))
206		err(1, "stdout");
207}
208
209void
210raw_cat(int rfd, const char *filename)
211{
212	int wfd;
213	ssize_t nr, nw, off;
214	static size_t bsize;
215	static char *buf = NULL;
216	struct stat sbuf;
217
218	wfd = fileno(stdout);
219	if (buf == NULL) {
220		if (fstat(wfd, &sbuf) == -1)
221			err(1, "stdout");
222		bsize = MAXIMUM(sbuf.st_blksize, BUFSIZ);
223		if ((buf = malloc(bsize)) == NULL)
224			err(1, NULL);
225	}
226	while ((nr = read(rfd, buf, bsize)) != -1 && nr != 0) {
227		for (off = 0; nr; nr -= nw, off += nw) {
228			if ((nw = write(wfd, buf + off, nr)) == -1 || nw == 0)
229				err(1, "stdout");
230		}
231	}
232	if (nr == -1) {
233		warn("%s", filename);
234		rval = 1;
235	}
236}
237