summaryrefslogtreecommitdiff
path: root/dos2unix.c
blob: 8b65d05de23714424c4259257aef64bf1bb76aef (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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
/*
 * 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 <unistd.h>
#include <stdint.h>
#include <fcntl.h>
#include <sys/time.h>
#include "busybox.h"

/* We are making a lame pseudo-random string generator here.  in
 * convert(), each pass through the while loop will add more and more
 * stuff into value, which is _supposed_ to wrap.  We don't care about
 * it being accurate.  We care about it being messy, since we then mod
 * it by the sizeof(letters) and then use that as an index into letters
 * to pick a random letter to add to out temporary file. */
typedef unsigned long int bb_uint64_t;

static const char letters[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";

// if fn is NULL then input is stdin and output is stdout
static int convert(char *fn, int ConvType) 
{
	int c, fd;
	struct timeval tv;
	char tempFn[BUFSIZ];
	static bb_uint64_t value=0;
	FILE *in = stdin, *out = stdout;

	if (fn != NULL) {
		if ((in = wfopen(fn, "rw")) == NULL) {
			return -1;
		}
		strcpy(tempFn, fn);
		c = strlen(tempFn);
		tempFn[c] = '.';
		while(1) {
		    if (c >=BUFSIZ)
			error_msg_and_die("unique name not found");
		    /* Get some semi random stuff to try and make a
		     * random filename based (and in the same dir as)
		     * the input file... */
		    gettimeofday (&tv, NULL);
		    value += ((bb_uint64_t) tv.tv_usec << 16) ^ tv.tv_sec ^ getpid ();
		    tempFn[++c] = letters[value % 62];
		    tempFn[c+1] = '\0';
		    value /= 62;

		    if ((fd = open(tempFn, O_RDWR | O_CREAT | O_EXCL, 0600)) < 0 ) {
			continue;
		    }
		    out = fdopen(fd, "w+");
		    if (!out) {
			close(fd);
			remove(tempFn);
			continue;
		    }
		    break;
		}
	}

	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
				remove(tempFn);
				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
				remove(tempFn);
				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) {
		perror_msg(NULL);
		remove(tempFn);
		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(tempFn, fn) < 0) {
		perror_msg("unable to rename '%s' as '%s'", tempFn, fn);
		return -1;
	    }
	}

	return 0;
}

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

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

	// 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;
}