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	niro	532	/* 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	niro	816	#include "libbb.h"
14	niro	532
15	niro	816	int catv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
16			int catv_main(int argc UNUSED_PARAM, char **argv)
17	niro	532	{
18	niro	816	int retval = EXIT_SUCCESS;
19			int fd;
20	niro	532	unsigned flags;
21
22	niro	816	flags = getopt32(argv, "etv");
23	niro	532	#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	niro	816	argv += optind;
28	niro	532
29	niro	816	/* Read from stdin if there's nothing else to do. */
30			if (!argv[0])
31			--argv = (char)"-";
32	niro	532	do {
33	niro	816	fd = open_or_warn_stdin(*argv);
34			if (fd < 0) {
35	niro	532	retval = EXIT_FAILURE;
36	niro	816	continue;
37			}
38			for (;;) {
39	niro	532	int i, res;
40
41	niro	816	#define read_buf bb_common_bufsiz1
42			res = read(fd, read_buf, COMMON_BUFSIZE);
43	niro	532	if (res < 0)
44			retval = EXIT_FAILURE;
45			if (res < 1)
46			break;
47			for (i = 0; i < res; i++) {
48	niro	816	unsigned char c = read_buf[i];
49	niro	532
50			if (c > 126 && (flags & CATV_OPT_v)) {
51			if (c == 127) {
52			printf("^?");
53			continue;
54			}
55	niro	816	printf("M-");
56			c -= 128;
57	niro	532	}
58			if (c < 32) {
59			if (c == 10) {
60			if (flags & CATV_OPT_e)
61	niro	816	bb_putchar('$');
62	niro	532	} else if (flags & (c==9 ? CATV_OPT_t : CATV_OPT_v)) {
63			printf("^%c", c+'@');
64			continue;
65			}
66			}
67	niro	816	bb_putchar(c);
68	niro	532	}
69			}
70			if (ENABLE_FEATURE_CLEAN_UP && fd)
71			close(fd);
72			} while (*++argv);
73
74			fflush_stdout_and_exit(retval);
75			}