inetd: fix order of array index check and array access
[oweals/busybox.git] / coreutils / dos2unix.c
1 /* vi: set sw=4 ts=4: */
2 /*
3  * dos2unix for BusyBox
4  *
5  * dos2unix '\n' convertor 0.5.0
6  * based on Unix2Dos 0.9.0 by Peter Hanecak (made 19.2.1997)
7  * Copyright 1997,.. by Peter Hanecak <hanecak@megaloman.sk>.
8  * All rights reserved.
9  *
10  * dos2unix filters reading input from stdin and writing output to stdout.
11  *
12  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
13 */
14
15 //usage:#define dos2unix_trivial_usage
16 //usage:       "[-ud] [FILE]"
17 //usage:#define dos2unix_full_usage "\n\n"
18 //usage:       "Convert FILE in-place from DOS to Unix format.\n"
19 //usage:       "When no file is given, use stdin/stdout.\n"
20 //usage:     "\n        -u      dos2unix"
21 //usage:     "\n        -d      unix2dos"
22 //usage:
23 //usage:#define unix2dos_trivial_usage
24 //usage:       "[-ud] [FILE]"
25 //usage:#define unix2dos_full_usage "\n\n"
26 //usage:       "Convert FILE in-place from Unix to DOS format.\n"
27 //usage:       "When no file is given, use stdin/stdout.\n"
28 //usage:     "\n        -u      dos2unix"
29 //usage:     "\n        -d      unix2dos"
30
31 #include "libbb.h"
32
33 /* This is a NOEXEC applet. Be very careful! */
34
35 enum {
36         CT_UNIX2DOS = 1,
37         CT_DOS2UNIX
38 };
39
40 /* if fn is NULL then input is stdin and output is stdout */
41 static void convert(char *fn, int conv_type)
42 {
43         FILE *in, *out;
44         int i;
45         char *temp_fn = temp_fn; /* for compiler */
46         char *resolved_fn = resolved_fn;
47
48         in = stdin;
49         out = stdout;
50         if (fn != NULL) {
51                 struct stat st;
52
53                 resolved_fn = xmalloc_follow_symlinks(fn);
54                 if (resolved_fn == NULL)
55                         bb_simple_perror_msg_and_die(fn);
56                 in = xfopen_for_read(resolved_fn);
57                 fstat(fileno(in), &st);
58
59                 temp_fn = xasprintf("%sXXXXXX", resolved_fn);
60                 i = xmkstemp(temp_fn);
61                 if (fchmod(i, st.st_mode) == -1)
62                         bb_simple_perror_msg_and_die(temp_fn);
63
64                 out = xfdopen_for_write(i);
65         }
66
67         while ((i = fgetc(in)) != EOF) {
68                 if (i == '\r')
69                         continue;
70                 if (i == '\n')
71                         if (conv_type == CT_UNIX2DOS)
72                                 fputc('\r', out);
73                 fputc(i, out);
74         }
75
76         if (fn != NULL) {
77                 if (fclose(in) < 0 || fclose(out) < 0) {
78                         unlink(temp_fn);
79                         bb_perror_nomsg_and_die();
80                 }
81                 xrename(temp_fn, resolved_fn);
82                 free(temp_fn);
83                 free(resolved_fn);
84         }
85 }
86
87 int dos2unix_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
88 int dos2unix_main(int argc UNUSED_PARAM, char **argv)
89 {
90         int o, conv_type;
91
92         /* See if we are supposed to be doing dos2unix or unix2dos */
93         conv_type = CT_UNIX2DOS;
94         if (applet_name[0] == 'd') {
95                 conv_type = CT_DOS2UNIX;
96         }
97
98         /* -u convert to unix, -d convert to dos */
99         opt_complementary = "u--d:d--u"; /* mutually exclusive */
100         o = getopt32(argv, "du");
101
102         /* Do the conversion requested by an argument else do the default
103          * conversion depending on our name.  */
104         if (o)
105                 conv_type = o;
106
107         argv += optind;
108         do {
109                 /* might be convert(NULL) if there is no filename given */
110                 convert(*argv, conv_type);
111         } while (*argv && *++argv);
112
113         return 0;
114 }