1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * dos2unix for BusyBox
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4 | *
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5 | * dos2unix '\n' convertor 0.5.0
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6 | * based on Unix2Dos 0.9.0 by Peter Hanecak (made 19.2.1997)
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7 | * Copyright 1997,.. by Peter Hanecak <hanecak@megaloman.sk>.
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8 | * All rights reserved.
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9 | *
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10 | * dos2unix filters reading input from stdin and writing output to stdout.
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11 | *
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12 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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13 | */
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14 |
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15 | //usage:#define dos2unix_trivial_usage
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16 | //usage: "[-ud] [FILE]"
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17 | //usage:#define dos2unix_full_usage "\n\n"
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18 | //usage: "Convert FILE in-place from DOS to Unix format.\n"
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19 | //usage: "When no file is given, use stdin/stdout.\n"
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20 | //usage: "\n -u dos2unix"
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21 | //usage: "\n -d unix2dos"
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22 | //usage:
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23 | //usage:#define unix2dos_trivial_usage
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24 | //usage: "[-ud] [FILE]"
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25 | //usage:#define unix2dos_full_usage "\n\n"
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26 | //usage: "Convert FILE in-place from Unix to DOS format.\n"
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27 | //usage: "When no file is given, use stdin/stdout.\n"
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28 | //usage: "\n -u dos2unix"
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29 | //usage: "\n -d unix2dos"
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30 |
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31 | #include "libbb.h"
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32 |
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33 | /* This is a NOEXEC applet. Be very careful! */
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34 |
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35 | enum {
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36 | CT_UNIX2DOS = 1,
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37 | CT_DOS2UNIX
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38 | };
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39 |
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40 | /* if fn is NULL then input is stdin and output is stdout */
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41 | static void convert(char *fn, int conv_type)
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42 | {
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43 | FILE *in, *out;
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44 | int ch;
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45 | char *temp_fn = temp_fn; /* for compiler */
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46 | char *resolved_fn = resolved_fn;
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47 |
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48 | in = stdin;
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49 | out = stdout;
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50 | if (fn != NULL) {
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51 | struct stat st;
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52 | int fd;
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53 |
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54 | resolved_fn = xmalloc_follow_symlinks(fn);
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55 | if (resolved_fn == NULL)
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56 | bb_simple_perror_msg_and_die(fn);
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57 | in = xfopen_for_read(resolved_fn);
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58 | xfstat(fileno(in), &st, resolved_fn);
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59 |
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60 | temp_fn = xasprintf("%sXXXXXX", resolved_fn);
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61 | fd = xmkstemp(temp_fn);
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62 | if (fchmod(fd, st.st_mode) == -1)
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63 | bb_simple_perror_msg_and_die(temp_fn);
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64 | fchown(fd, st.st_uid, st.st_gid);
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65 |
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66 | out = xfdopen_for_write(fd);
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67 | }
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68 |
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69 | while ((ch = fgetc(in)) != EOF) {
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70 | if (ch == '\r')
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71 | continue;
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72 | if (ch == '\n')
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73 | if (conv_type == CT_UNIX2DOS)
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74 | fputc('\r', out);
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75 | fputc(ch, out);
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76 | }
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77 |
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78 | if (fn != NULL) {
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79 | if (fclose(in) < 0 || fclose(out) < 0) {
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80 | unlink(temp_fn);
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81 | bb_perror_nomsg_and_die();
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82 | }
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83 | xrename(temp_fn, resolved_fn);
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84 | free(temp_fn);
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85 | free(resolved_fn);
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86 | }
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87 | }
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88 |
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89 | int dos2unix_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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90 | int dos2unix_main(int argc UNUSED_PARAM, char **argv)
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91 | {
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92 | int o, conv_type;
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93 |
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94 | /* See if we are supposed to be doing dos2unix or unix2dos */
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95 | conv_type = CT_UNIX2DOS;
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96 | if (applet_name[0] == 'd') {
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97 | conv_type = CT_DOS2UNIX;
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98 | }
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99 |
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100 | /* -u convert to unix, -d convert to dos */
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101 | opt_complementary = "u--d:d--u"; /* mutually exclusive */
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102 | o = getopt32(argv, "du");
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103 |
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104 | /* Do the conversion requested by an argument else do the default
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105 | * conversion depending on our name. */
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106 | if (o)
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107 | conv_type = o;
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108 |
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109 | argv += optind;
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110 | do {
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111 | /* might be convert(NULL) if there is no filename given */
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112 | convert(*argv, conv_type);
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113 | } while (*argv && *++argv);
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114 |
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115 | return 0;
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116 | }
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