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 "busybox.h"

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

	flags = getopt32(argc, 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;
	do {
		/* Read from stdin if there's nothing else to do. */
		fd = 0;
		if (*argv && 0 > (fd = xopen(*argv, O_RDONLY)))
			retval = EXIT_FAILURE;
		else for (;;) {
			int i, res;

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

				if (c > 126 && (flags & CATV_OPT_v)) {
					if (c == 127) {
						printf("^?");
						continue;
					} else {
						printf("M-");
						c -= 128;
					}
				}
				if (c < 32) {
					if (c == 10) {
						if (flags & CATV_OPT_e)
							putchar('$');
					} else if (flags & (c==9 ? CATV_OPT_t : CATV_OPT_v)) {
						printf("^%c", c+'@');
						continue;
					}
				}
				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 "busybox.h"
14
15	int catv_main(int argc, char **argv)
16	{
17	int retval = EXIT_SUCCESS, fd;
18	unsigned flags;
19
20	flags = getopt32(argc, argv, "etv");
21	#define CATV_OPT_e (1<<0)
22	#define CATV_OPT_t (1<<1)
23	#define CATV_OPT_v (1<<2)
24	flags ^= CATV_OPT_v;
25
26	argv += optind;
27	do {
28	/* Read from stdin if there's nothing else to do. */
29	fd = 0;
30	if (argv && 0 > (fd = xopen(argv, O_RDONLY)))
31	retval = EXIT_FAILURE;
32	else for (;;) {
33	int i, res;
34
35	res = read(fd, bb_common_bufsiz1, sizeof(bb_common_bufsiz1));
36	if (res < 0)
37	retval = EXIT_FAILURE;
38	if (res < 1)
39	break;
40	for (i = 0; i < res; i++) {
41	char c = bb_common_bufsiz1[i];
42
43	if (c > 126 && (flags & CATV_OPT_v)) {
44	if (c == 127) {
45	printf("^?");
46	continue;
47	} else {
48	printf("M-");
49	c -= 128;
50	}
51	}
52	if (c < 32) {
53	if (c == 10) {
54	if (flags & CATV_OPT_e)
55	putchar('$');
56	} else if (flags & (c==9 ? CATV_OPT_t : CATV_OPT_v)) {
57	printf("^%c", c+'@');
58	continue;
59	}
60	}
61	putchar(c);
62	}
63	}
64	if (ENABLE_FEATURE_CLEAN_UP && fd)
65	close(fd);
66	} while (*++argv);
67
68	fflush_stdout_and_exit(retval);
69	}