summaryrefslogtreecommitdiff
path: root/coreutils/dos2unix.c
blob: e595bf558f31a2b7f1420bf9ba5f771a33f94011 (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
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
/* vi: set sw=4 ts=4: */
/*
 * dos2unix for BusyBox
 *
 * dos2unix '\n' converter 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 GPLv2 or later, see file LICENSE in this source tree.
 */
//config:config DOS2UNIX
//config:	bool "dos2unix (5.1 kb)"
//config:	default y
//config:	help
//config:	  dos2unix is used to convert a text file from DOS format to
//config:	  UNIX format, and vice versa.
//config:
//config:config UNIX2DOS
//config:	bool "unix2dos (5.1 kb)"
//config:	default y
//config:	help
//config:	  unix2dos is used to convert a text file from UNIX format to
//config:	  DOS format, and vice versa.

//applet:IF_DOS2UNIX(APPLET_NOEXEC(dos2unix, dos2unix, BB_DIR_USR_BIN, BB_SUID_DROP, dos2unix))
//applet:IF_UNIX2DOS(APPLET_NOEXEC(unix2dos, dos2unix, BB_DIR_USR_BIN, BB_SUID_DROP, unix2dos))

//kbuild:lib-$(CONFIG_DOS2UNIX) += dos2unix.o
//kbuild:lib-$(CONFIG_UNIX2DOS) += dos2unix.o

//usage:#define dos2unix_trivial_usage
//usage:       "[-ud] [FILE]"
//usage:#define dos2unix_full_usage "\n\n"
//usage:       "Convert FILE in-place from DOS to Unix format.\n"
//usage:       "When no file is given, use stdin/stdout.\n"
//usage:     "\n	-u	dos2unix"
//usage:     "\n	-d	unix2dos"
//usage:
//usage:#define unix2dos_trivial_usage
//usage:       "[-ud] [FILE]"
//usage:#define unix2dos_full_usage "\n\n"
//usage:       "Convert FILE in-place from Unix to DOS format.\n"
//usage:       "When no file is given, use stdin/stdout.\n"
//usage:     "\n	-u	dos2unix"
//usage:     "\n	-d	unix2dos"

#include "libbb.h"

/* This is a NOEXEC applet. Be very careful! */

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 ch;
	char *temp_fn = temp_fn; /* for compiler */
	char *resolved_fn = resolved_fn;

	in = stdin;
	out = stdout;
	if (fn != NULL) {
		struct stat st;
		int fd;

		resolved_fn = xmalloc_follow_symlinks(fn);
		if (resolved_fn == NULL)
			bb_simple_perror_msg_and_die(fn);
		in = xfopen_for_read(resolved_fn);
		xfstat(fileno(in), &st, resolved_fn);

		temp_fn = xasprintf("%sXXXXXX", resolved_fn);
		fd = xmkstemp(temp_fn);
		if (fchmod(fd, st.st_mode) == -1)
			bb_simple_perror_msg_and_die(temp_fn);
		fchown(fd, st.st_uid, st.st_gid);

		out = xfdopen_for_write(fd);
	}

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

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

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

	/* See if we are supposed to be doing dos2unix or unix2dos */
	if (ENABLE_DOS2UNIX
	 && (!ENABLE_UNIX2DOS || applet_name[0] == 'd')
	) {
		conv_type = CT_DOS2UNIX;
	} else {
		conv_type = CT_UNIX2DOS;
	}

	/* -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;

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

	return 0;
}