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1/*
2 * dos2unix for BusyBox
3 *
4 * dos2unix '\n' convertor 0.5.0
5 * based on Unix2Dos 0.9.0 by Peter Hanecak (made 19.2.1997)
6 * Copyright 1997,.. by Peter Hanecak <hanecak@megaloman.sk>.
7 * All rights reserved.
8 *
9 * dos2unix filters reading input from stdin and writing output to stdout.
10 * Without arguments it reverts the format (e.i. if source is in UNIX format,
11 * output is in DOS format and vice versa).
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version 2
16 * of the License, or (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 * See the COPYING file for license information.
28 */
29
30#include <string.h>
31#include <getopt.h>
32#include <unistd.h>
33#include <stdint.h>
34#include <fcntl.h>
35#include <sys/time.h>
36#include "busybox.h"
37
38#define CT_AUTO 0
39#define CT_UNIX2DOS 1
40#define CT_DOS2UNIX 2
41
42/* We are making a lame pseudo-random string generator here. in
43 * convert(), each pass through the while loop will add more and more
44 * stuff into value, which is _supposed_ to wrap. We don't care about
45 * it being accurate. We care about it being messy, since we then mod
46 * it by the sizeof(letters) and then use that as an index into letters
47 * to pick a random letter to add to out temporary file. */
48typedef unsigned long int bb_uint64_t;
49
50static const char letters[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
51
52// if fn is NULL then input is stdin and output is stdout
53static int convert(char *fn, int ConvType)
54{
55 int c, fd;
56 struct timeval tv;
57 char tempFn[BUFSIZ];
58 static bb_uint64_t value=0;
59 FILE *in = stdin, *out = stdout;
60
61 if (fn != NULL) {
62 in = bb_xfopen(fn, "rw");
63 safe_strncpy(tempFn, fn, sizeof(tempFn));
64 c = strlen(tempFn);
65 tempFn[c] = '.';
66 while(1) {
67 /* tempFn is BUFSIZ so the last addressable spot it BUFSIZ-1.
68 * The loop increments by 2. So this must check for BUFSIZ-3. */
69 if (c >=BUFSIZ-3)
70 bb_error_msg_and_die("unique name not found");
71 /* Get some semi random stuff to try and make a
72 * random filename based (and in the same dir as)
73 * the input file... */
74 gettimeofday (&tv, NULL);
75 value += ((bb_uint64_t) tv.tv_usec << 16) ^ tv.tv_sec ^ getpid ();
76 tempFn[++c] = letters[value % 62];
77 tempFn[c+1] = '\0';
78 value /= 62;
79
80 if ((fd = open(tempFn, O_RDWR | O_CREAT | O_EXCL, 0600)) < 0 ) {
81 continue;
82 }
83 out = fdopen(fd, "w+");
84 if (!out) {
85 close(fd);
86 remove(tempFn);
87 continue;
88 }
89 break;
90 }
91 }
92
93 while ((c = fgetc(in)) != EOF) {
94 if (c == '\r') {
95 if ((ConvType == CT_UNIX2DOS) && (fn != NULL)) {
96 // file is alredy in DOS format so it is not necessery to touch it
97 remove(tempFn);
98 if (fclose(in) < 0 || fclose(out) < 0) {
99 bb_perror_nomsg();
100 return -2;
101 }
102 return 0;
103 }
104 if (!ConvType)
105 ConvType = CT_DOS2UNIX;
106 break;
107 }
108 if (c == '\n') {
109 if ((ConvType == CT_DOS2UNIX) && (fn != NULL)) {
110 // file is alredy in UNIX format so it is not necessery to touch it
111 remove(tempFn);
112 if ((fclose(in) < 0) || (fclose(out) < 0)) {
113 bb_perror_nomsg();
114 return -2;
115 }
116 return 0;
117 }
118 if (!ConvType) {
119 ConvType = CT_UNIX2DOS;
120 }
121 if (ConvType == CT_UNIX2DOS) {
122 fputc('\r', out);
123 }
124 fputc('\n', out);
125 break;
126 }
127 fputc(c, out);
128 }
129 if (c != EOF)
130 while ((c = fgetc(in)) != EOF) {
131 if (c == '\r')
132 continue;
133 if (c == '\n') {
134 if (ConvType == CT_UNIX2DOS)
135 fputc('\r', out);
136 fputc('\n', out);
137 continue;
138 }
139 fputc(c, out);
140 }
141
142 if (fn != NULL) {
143 if (fclose(in) < 0 || fclose(out) < 0) {
144 bb_perror_nomsg();
145 remove(tempFn);
146 return -2;
147 }
148
149 /* Assume they are both on the same filesystem (which
150 * should be true since we put them into the same directory
151 * so we _should_ be ok, but you never know... */
152 if (rename(tempFn, fn) < 0) {
153 bb_perror_msg("unable to rename '%s' as '%s'", tempFn, fn);
154 return -1;
155 }
156 }
157
158 return 0;
159}
160
161int dos2unix_main(int argc, char *argv[])
162{
163 int ConvType = CT_AUTO;
164 int o;
165
166 //See if we are supposed to be doing dos2unix or unix2dos
167 if (argv[0][0]=='d') {
168 ConvType = CT_DOS2UNIX;
169 }
170 if (argv[0][0]=='u') {
171 ConvType = CT_UNIX2DOS;
172 }
173
174 // process parameters
175 while ((o = getopt(argc, argv, "du")) != EOF) {
176 switch (o) {
177 case 'd':
178 ConvType = CT_UNIX2DOS;
179 break;
180 case 'u':
181 ConvType = CT_DOS2UNIX;
182 break;
183 default:
184 bb_show_usage();
185 }
186 }
187
188 if (optind < argc) {
189 while(optind < argc)
190 if ((o = convert(argv[optind++], ConvType)) < 0)
191 break;
192 }
193 else
194 o = convert(NULL, ConvType);
195
196 return o;
197}
198