aboutsummaryrefslogtreecommitdiff
path: root/coreutils/dos2unix.c
blob: 8308c417996ae000a25d9af10d264f58330eaaa5 (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
139
140
141
142
143
144
145
/*
 * 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.
 * Without arguments it reverts the format (e.i. if source is in UNIX format,
 * output is in DOS format and vice versa).
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * See the COPYING file for license information.
 */

#include <string.h>
#include <getopt.h>
#include "busybox.h"

// if fn is NULL then input is stdin and output is stdout
extern int convert(char *fn, int ConvType) {
	char c;
	char *tempFn = NULL;
	FILE *in = stdin, *out = stdout;

	if (fn != NULL) {
		if ((in = wfopen(fn, "r")) == NULL) {
			return -1;
		}
		if ((out = tmpfile()) == NULL) {
			perror_msg(NULL);
			return -2;
		}
	}

	while ((c = fgetc(in)) != EOF) {
		if (c == '\r') {
			if ((ConvType == CT_UNIX2DOS) && (fn != NULL)) {
				// file is alredy in DOS format so it is not necessery to touch it
				if (fclose(in) < 0 || fclose(out) < 0) {
					perror_msg(NULL);
					return -2;
				}
				return 0;
			}
			if (!ConvType)
				ConvType = CT_DOS2UNIX;
			break;
		}
		if (c == '\n') {
			if ((ConvType == CT_DOS2UNIX) && (fn != NULL)) {
				// file is alredy in UNIX format so it is not necessery to touch it
				if ((fclose(in) < 0) || (fclose(out) < 0)) {
					perror_msg(NULL);
					return -2;
				}
				return 0;
			}
			if (!ConvType) {
				ConvType = CT_UNIX2DOS;
			}
			if (ConvType == CT_UNIX2DOS) {
				fputc('\r', out);
			}
			fputc('\n', out);
			break;
		}
		fputc(c, out);
	}
	if (c != EOF)
		while ((c = fgetc(in)) != EOF) {
			if (c == '\r')
				continue;
			if (c == '\n') {
				if (ConvType == CT_UNIX2DOS)
					fputc('\r', out);
				fputc('\n', out);
				continue;
			}
		fputc(c, out);
	}

	if (fn != NULL) {
	    if (fclose(in) < 0 || fclose(out) < 0 || 
		    (in = fopen(tempFn, "r")) == NULL || (out = fopen(fn, "w")) == NULL) {
			perror_msg(NULL);
			return -2;
	    }

	    while ((c = fgetc(in)) != EOF) {
			fputc(c, out);
		}

	    if ((fclose(in) < 0) || (fclose(out) < 0)) {
			perror_msg(NULL);
			return -2;
	    }
	}

	return 0;
}

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

	// process parameters
	while ((o = getopt(argc, argv, "du")) != EOF) {
		switch (o) {
		case 'd':
			ConvType = CT_UNIX2DOS;
			break;
		case 'u':
			ConvType = CT_DOS2UNIX;
			break;
		default:
			show_usage();
		}
	}

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

	return o;
}