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 | #include "libbb.h"
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16 |
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17 | /* This is a NOEXEC applet. Be very careful! */
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18 |
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19 | enum {
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20 | CT_UNIX2DOS = 1,
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21 | CT_DOS2UNIX
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22 | };
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23 |
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24 | /* if fn is NULL then input is stdin and output is stdout */
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25 | static void convert(char *fn, int conv_type)
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26 | {
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27 | FILE *in, *out;
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28 | int i;
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29 | char *temp_fn = temp_fn; /* for compiler */
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30 | char *resolved_fn = resolved_fn;
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31 |
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32 | in = stdin;
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33 | out = stdout;
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34 | if (fn != NULL) {
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35 | struct stat st;
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36 |
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37 | resolved_fn = xmalloc_follow_symlinks(fn);
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38 | if (resolved_fn == NULL)
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39 | bb_simple_perror_msg_and_die(fn);
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40 | in = xfopen_for_read(resolved_fn);
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41 | fstat(fileno(in), &st);
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42 |
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43 | temp_fn = xasprintf("%sXXXXXX", resolved_fn);
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44 | i = xmkstemp(temp_fn);
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45 | if (fchmod(i, st.st_mode) == -1)
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46 | bb_simple_perror_msg_and_die(temp_fn);
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47 |
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48 | out = xfdopen_for_write(i);
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49 | }
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50 |
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51 | while ((i = fgetc(in)) != EOF) {
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52 | if (i == '\r')
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53 | continue;
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54 | if (i == '\n')
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55 | if (conv_type == CT_UNIX2DOS)
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56 | fputc('\r', out);
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57 | fputc(i, out);
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58 | }
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59 |
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60 | if (fn != NULL) {
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61 | if (fclose(in) < 0 || fclose(out) < 0) {
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62 | unlink(temp_fn);
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63 | bb_perror_nomsg_and_die();
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64 | }
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65 | xrename(temp_fn, resolved_fn);
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66 | free(temp_fn);
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67 | free(resolved_fn);
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68 | }
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69 | }
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70 |
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71 | int dos2unix_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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72 | int dos2unix_main(int argc UNUSED_PARAM, char **argv)
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73 | {
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74 | int o, conv_type;
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75 |
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76 | /* See if we are supposed to be doing dos2unix or unix2dos */
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77 | conv_type = CT_UNIX2DOS;
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78 | if (applet_name[0] == 'd') {
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79 | conv_type = CT_DOS2UNIX;
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80 | }
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81 |
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82 | /* -u convert to unix, -d convert to dos */
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83 | opt_complementary = "u--d:d--u"; /* mutually exclusive */
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84 | o = getopt32(argv, "du");
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85 |
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86 | /* Do the conversion requested by an argument else do the default
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87 | * conversion depending on our name. */
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88 | if (o)
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89 | conv_type = o;
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90 |
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91 | argv += optind;
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92 | do {
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93 | /* might be convert(NULL) if there is no filename given */
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94 | convert(*argv, conv_type);
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95 | } while (*argv && *++argv);
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96 |
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97 | return 0;
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98 | }
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