busybox/coreutils/catv.c

/* vi: set sw=4 ts=4: */
/*
 * cat -v implementation for busybox
 *
 * Copyright (C) 2006 Rob Landley <rob@landley.net>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

/* See "Cat -v considered harmful" at
 * http://cm.bell-labs.com/cm/cs/doc/84/kp.ps.gz */

#include "libbb.h"

int catv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int catv_main(int argc UNUSED_PARAM, char **argv)
{
	int retval = EXIT_SUCCESS;
	int fd;
	unsigned flags;

	flags = getopt32(argv, "etv");
#define CATV_OPT_e (1<<0)
#define CATV_OPT_t (1<<1)
#define CATV_OPT_v (1<<2)
	flags ^= CATV_OPT_v;
	argv += optind;

	/* Read from stdin if there's nothing else to do. */
	if (!argv[0])
		*--argv = (char*)"-";
	do {
		fd = open_or_warn_stdin(*argv);
		if (fd < 0) {
			retval = EXIT_FAILURE;
			continue;
		}
		for (;;) {
			int i, res;

#define read_buf bb_common_bufsiz1
			res = read(fd, read_buf, COMMON_BUFSIZE);
			if (res < 0)
				retval = EXIT_FAILURE;
			if (res < 1)
				break;
			for (i = 0; i < res; i++) {
				unsigned char c = read_buf[i];

				if (c > 126 && (flags & CATV_OPT_v)) {
					if (c == 127) {
						printf("^?");
						continue;
					}
					printf("M-");
					c -= 128;
				}
				if (c < 32) {
					if (c == 10) {
						if (flags & CATV_OPT_e)
							bb_putchar('$');
					} else if (flags & (c==9 ? CATV_OPT_t : CATV_OPT_v)) {
						printf("^%c", c+'@');
						continue;
					}
				}
				bb_putchar(c);
			}
		}
		if (ENABLE_FEATURE_CLEAN_UP && fd)
			close(fd);
	} while (*++argv);

	fflush_stdout_and_exit(retval);
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* cat -v implementation for busybox
4	*
5	* Copyright (C) 2006 Rob Landley <rob@landley.net>
6	*
7	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8	*/
9
10	/* See "Cat -v considered harmful" at
11	* http://cm.bell-labs.com/cm/cs/doc/84/kp.ps.gz */
12
13	#include "libbb.h"
14
15	int catv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
16	int catv_main(int argc UNUSED_PARAM, char **argv)
17	{
18	int retval = EXIT_SUCCESS;
19	int fd;
20	unsigned flags;
21
22	flags = getopt32(argv, "etv");
23	#define CATV_OPT_e (1<<0)
24	#define CATV_OPT_t (1<<1)
25	#define CATV_OPT_v (1<<2)
26	flags ^= CATV_OPT_v;
27	argv += optind;
28
29	/* Read from stdin if there's nothing else to do. */
30	if (!argv[0])
31	--argv = (char)"-";
32	do {
33	fd = open_or_warn_stdin(*argv);
34	if (fd < 0) {
35	retval = EXIT_FAILURE;
36	continue;
37	}
38	for (;;) {
39	int i, res;
40
41	#define read_buf bb_common_bufsiz1
42	res = read(fd, read_buf, COMMON_BUFSIZE);
43	if (res < 0)
44	retval = EXIT_FAILURE;
45	if (res < 1)
46	break;
47	for (i = 0; i < res; i++) {
48	unsigned char c = read_buf[i];
49
50	if (c > 126 && (flags & CATV_OPT_v)) {
51	if (c == 127) {
52	printf("^?");
53	continue;
54	}
55	printf("M-");
56	c -= 128;
57	}
58	if (c < 32) {
59	if (c == 10) {
60	if (flags & CATV_OPT_e)
61	bb_putchar('$');
62	} else if (flags & (c==9 ? CATV_OPT_t : CATV_OPT_v)) {
63	printf("^%c", c+'@');
64	continue;
65	}
66	}
67	bb_putchar(c);
68	}
69	}
70	if (ENABLE_FEATURE_CLEAN_UP && fd)
71	close(fd);
72	} while (*++argv);
73
74	fflush_stdout_and_exit(retval);
75	}