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 the GPL v2 or later, see the file LICENSE in this tarball.
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13 | */
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14 |
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15 | #include <string.h>
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16 | #include <unistd.h>
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17 | #include <stdint.h>
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18 | #include <fcntl.h>
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19 | #include "busybox.h"
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20 |
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21 | enum ConvType {
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22 | CT_UNIX2DOS = 1,
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23 | CT_DOS2UNIX
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24 | } ConvType;
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25 |
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26 | /* if fn is NULL then input is stdin and output is stdout */
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27 | static int convert(char *fn)
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28 | {
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29 | FILE *in, *out;
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30 | int i;
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31 |
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32 | if (fn != NULL) {
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33 | in = bb_xfopen(fn, "rw");
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34 | /*
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35 | The file is then created with mode read/write and
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36 | permissions 0666 for glibc 2.0.6 and earlier or
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37 | 0600 for glibc 2.0.7 and later.
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38 | */
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39 | snprintf(bb_common_bufsiz1, sizeof(bb_common_bufsiz1), "%sXXXXXX", fn);
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40 | /*
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41 | sizeof bb_common_bufsiz1 is 4096, so it should be big enough to
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42 | hold the full path. However if the output is truncated the
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43 | subsequent call to mkstemp would fail.
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44 | */
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45 | if ((i = mkstemp(&bb_common_bufsiz1[0])) == -1
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46 | || chmod(bb_common_bufsiz1, 0600) == -1) {
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47 | bb_perror_nomsg_and_die();
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48 | }
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49 | out = fdopen(i, "w+");
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50 | if (!out) {
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51 | close(i);
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52 | remove(bb_common_bufsiz1);
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53 | }
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54 | } else {
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55 | in = stdin;
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56 | out = stdout;
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57 | }
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58 |
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59 | while ((i = fgetc(in)) != EOF) {
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60 | if (i == '\r')
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61 | continue;
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62 | if (i == '\n') {
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63 | if (ConvType == CT_UNIX2DOS)
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64 | fputc('\r', out);
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65 | fputc('\n', out);
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66 | continue;
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67 | }
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68 | fputc(i, out);
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69 | }
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70 |
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71 | if (fn != NULL) {
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72 | if (fclose(in) < 0 || fclose(out) < 0) {
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73 | bb_perror_nomsg();
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74 | remove(bb_common_bufsiz1);
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75 | return -2;
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76 | }
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77 | /* Assume they are both on the same filesystem (which
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78 | * should be true since we put them into the same directory
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79 | * so we _should_ be ok, but you never know... */
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80 | if (rename(bb_common_bufsiz1, fn) < 0) {
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81 | bb_perror_msg("cannot rename '%s' as '%s'", bb_common_bufsiz1, fn);
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82 | return -1;
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83 | }
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84 | }
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85 |
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86 | return 0;
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87 | }
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88 |
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89 | int dos2unix_main(int argc, char *argv[])
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90 | {
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91 | int o;
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92 |
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93 | /* See if we are supposed to be doing dos2unix or unix2dos */
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94 | if (bb_applet_name[0] == 'd') {
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95 | ConvType = CT_DOS2UNIX; /*2 */
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96 | } else {
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97 | ConvType = CT_UNIX2DOS; /*1 */
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98 | }
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99 | /* -u and -d are mutally exclusive */
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100 | bb_opt_complementally = "?:u--d:d--u";
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101 | /* process parameters */
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102 | /* -u convert to unix */
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103 | /* -d convert to dos */
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104 | o = bb_getopt_ulflags(argc, argv, "du");
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105 |
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106 | /* Do the conversion requested by an argument else do the default
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107 | * conversion depending on our name. */
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108 | if (o)
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109 | ConvType = o;
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110 |
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111 | if (optind < argc) {
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112 | while (optind < argc)
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113 | if ((o = convert(argv[optind++])) < 0)
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114 | break;
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115 | } else
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116 | o = convert(NULL);
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117 |
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118 | return o;
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119 | }
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