summaryrefslogtreecommitdiff
path: root/coreutils/dos2unix.c
blob: 7776133f40e5eb3ab16fe07ee9f8c322700d14e7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
/* 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 "libbb.h"

enum {
	CT_UNIX2DOS = 1,
	CT_DOS2UNIX
};

/* if fn is NULL then input is stdin and output is stdout */
static void convert(char *fn, int conv_type)
{
	FILE *in, *out;
	int i;
#define name_buf bb_common_bufsiz1

	in = stdin;
	out = stdout;
	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(name_buf, sizeof(name_buf), "%sXXXXXX", fn);
		i = mkstemp(&name_buf[0]);
		if (i == -1
		 || fchmod(i, 0600) == -1
		 || !(out = fdopen(i, "w+"))
		) {
			bb_perror_nomsg_and_die();
		}
	}

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

	if (fn != NULL) {
		if (fclose(in) < 0 || fclose(out) < 0) {
			unlink(name_buf);
			bb_perror_nomsg_and_die();
		}
		xrename(name_buf, fn);
	}
}

int dos2unix_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int dos2unix_main(int argc, char **argv)
{
	int o, conv_type;

	/* See if we are supposed to be doing dos2unix or unix2dos */
	conv_type = CT_UNIX2DOS;
	if (applet_name[0] == 'd') {
		conv_type = CT_DOS2UNIX;
	}

	/* -u convert to unix, -d convert to dos */
	opt_complementary = "u--d:d--u"; /* mutually exclusive */
	o = getopt32(argv, "du");

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

	do {
		/* might be convert(NULL) if there is no filename given */
		convert(argv[optind], conv_type);
		optind++;
	} while (optind < argc);

	return 0;
}