busybox/coreutils/dos2unix.c

/* vi: set sw=4 ts=4: */
/*
 * dos2unix for BusyBox
 *
 * dos2unix '\n' convertor 0.5.0
 * based on Unix2Dos 0.9.0 by Peter Hanecak (made 19.2.1997)
 * Copyright 1997,.. by Peter Hanecak <hanecak@megaloman.sk>.
 * All rights reserved.
 *
 * dos2unix filters reading input from stdin and writing output to stdout.
 *
 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/

#include "busybox.h"

enum ConvType {
	CT_UNIX2DOS = 1,
	CT_DOS2UNIX
} ConvType;

/* if fn is NULL then input is stdin and output is stdout */
static int convert(char *fn)
{
	FILE *in, *out;
	int i;

	if (fn != NULL) {
		in = xfopen(fn, "rw");
		/*
		   The file is then created with mode read/write and
		   permissions 0666 for glibc 2.0.6 and earlier or
		   0600  for glibc  2.0.7 and  later.
		 */
		snprintf(bb_common_bufsiz1, sizeof(bb_common_bufsiz1), "%sXXXXXX", fn);
		/*
		   sizeof bb_common_bufsiz1 is 4096, so it should be big enough to
		   hold the full path.  However if the output is truncated the
		   subsequent call to mkstemp would fail.
		 */
		if ((i = mkstemp(&bb_common_bufsiz1[0])) == -1
			|| chmod(bb_common_bufsiz1, 0600) == -1) {
			bb_perror_nomsg_and_die();
		}
		out = fdopen(i, "w+");
		if (!out) {
			close(i);
			remove(bb_common_bufsiz1);
		}
	} else {
		in = stdin;
		out = stdout;
	}

	while ((i = fgetc(in)) != EOF) {
		if (i == '\r')
			continue;
		if (i == '\n') {
			if (ConvType == CT_UNIX2DOS)
				fputc('\r', out);
			fputc('\n', out);
			continue;
		}
		fputc(i, out);
	}

	if (fn != NULL) {
		if (fclose(in) < 0 || fclose(out) < 0) {
			bb_perror_nomsg();
			remove(bb_common_bufsiz1);
			return -2;
		}
		/* Assume they are both on the same filesystem (which
		 * should be true since we put them into the same directory
		 * so we _should_ be ok, but you never know... */
		if (rename(bb_common_bufsiz1, fn) < 0) {
			bb_perror_msg("cannot rename '%s' as '%s'", bb_common_bufsiz1, fn);
			return -1;
		}
	}

	return 0;
}

int dos2unix_main(int argc, char *argv[])
{
	int o;

	/* See if we are supposed to be doing dos2unix or unix2dos */
	if (applet_name[0] == 'd') {
		ConvType = CT_DOS2UNIX;	/*2 */
	} else {
		ConvType = CT_UNIX2DOS;	/*1 */
	}
	/* -u and -d are mutally exclusive */
	opt_complementary = "?:u--d:d--u";
	/* process parameters */
	/* -u convert to unix */
	/* -d convert to dos  */
	o = getopt32(argc, argv, "du");

	/* Do the conversion requested by an argument else do the default
	 * conversion depending on our name.  */
	if (o)
		ConvType = o;

	if (optind < argc) {
		while (optind < argc)
			if ((o = convert(argv[optind++])) < 0)
				break;
	} else
		o = convert(NULL);

	return o;
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* dos2unix for BusyBox
4	*
5	* dos2unix '\n' convertor 0.5.0
6	* based on Unix2Dos 0.9.0 by Peter Hanecak (made 19.2.1997)
7	* Copyright 1997,.. by Peter Hanecak <hanecak@megaloman.sk>.
8	* All rights reserved.
9	*
10	* dos2unix filters reading input from stdin and writing output to stdout.
11	*
12	* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
13	*/
14
15	#include "busybox.h"
16
17	enum ConvType {
18	CT_UNIX2DOS = 1,
19	CT_DOS2UNIX
20	} ConvType;
21
22	/* if fn is NULL then input is stdin and output is stdout */
23	static int convert(char *fn)
24	{
25	FILE in, out;
26	int i;
27
28	if (fn != NULL) {
29	in = xfopen(fn, "rw");
30	/*
31	The file is then created with mode read/write and
32	permissions 0666 for glibc 2.0.6 and earlier or
33	0600 for glibc 2.0.7 and later.
34	*/
35	snprintf(bb_common_bufsiz1, sizeof(bb_common_bufsiz1), "%sXXXXXX", fn);
36	/*
37	sizeof bb_common_bufsiz1 is 4096, so it should be big enough to
38	hold the full path. However if the output is truncated the
39	subsequent call to mkstemp would fail.
40	*/
41	if ((i = mkstemp(&bb_common_bufsiz1[0])) == -1
42	\|\| chmod(bb_common_bufsiz1, 0600) == -1) {
43	bb_perror_nomsg_and_die();
44	}
45	out = fdopen(i, "w+");
46	if (!out) {
47	close(i);
48	remove(bb_common_bufsiz1);
49	}
50	} else {
51	in = stdin;
52	out = stdout;
53	}
54
55	while ((i = fgetc(in)) != EOF) {
56	if (i == '\r')
57	continue;
58	if (i == '\n') {
59	if (ConvType == CT_UNIX2DOS)
60	fputc('\r', out);
61	fputc('\n', out);
62	continue;
63	}
64	fputc(i, out);
65	}
66
67	if (fn != NULL) {
68	if (fclose(in) < 0 \|\| fclose(out) < 0) {
69	bb_perror_nomsg();
70	remove(bb_common_bufsiz1);
71	return -2;
72	}
73	/* Assume they are both on the same filesystem (which
74	* should be true since we put them into the same directory
75	* so we _should_ be ok, but you never know... */
76	if (rename(bb_common_bufsiz1, fn) < 0) {
77	bb_perror_msg("cannot rename '%s' as '%s'", bb_common_bufsiz1, fn);
78	return -1;
79	}
80	}
81
82	return 0;
83	}
84
85	int dos2unix_main(int argc, char *argv[])
86	{
87	int o;
88
89	/* See if we are supposed to be doing dos2unix or unix2dos */
90	if (applet_name[0] == 'd') {
91	ConvType = CT_DOS2UNIX; /2 /
92	} else {
93	ConvType = CT_UNIX2DOS; /1 /
94	}
95	/* -u and -d are mutally exclusive */
96	opt_complementary = "?:u--d:d--u";
97	/* process parameters */
98	/* -u convert to unix */
99	/* -d convert to dos */
100	o = getopt32(argc, argv, "du");
101
102	/* Do the conversion requested by an argument else do the default
103	* conversion depending on our name. */
104	if (o)
105	ConvType = o;
106
107	if (optind < argc) {
108	while (optind < argc)
109	if ((o = convert(argv[optind++])) < 0)
110	break;
111	} else
112	o = convert(NULL);
113
114	return o;
115	}