1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini cp implementation for busybox
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4 | *
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5 | * Copyright (C) 2000 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
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6 | * SELinux support by Yuichi Nakamura <ynakam@hitachisoft.jp>
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7 | *
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8 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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9 | */
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10 |
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11 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/cp.html */
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12 |
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13 | /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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14 | *
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15 | * Size reduction.
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16 | */
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17 |
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18 | #include "libbb.h"
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19 | #include "libcoreutils/coreutils.h"
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20 |
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21 | /* This is a NOEXEC applet. Be very careful! */
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22 |
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23 | int cp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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24 | int cp_main(int argc, char **argv)
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25 | {
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26 | struct stat source_stat;
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27 | struct stat dest_stat;
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28 | const char *last;
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29 | const char *dest;
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30 | int s_flags;
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31 | int d_flags;
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32 | int flags;
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33 | int status;
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34 | enum {
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35 | OPT_a = 1 << (sizeof(FILEUTILS_CP_OPTSTR)-1),
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36 | OPT_r = 1 << (sizeof(FILEUTILS_CP_OPTSTR)),
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37 | OPT_P = 1 << (sizeof(FILEUTILS_CP_OPTSTR)+1),
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38 | OPT_v = 1 << (sizeof(FILEUTILS_CP_OPTSTR)+2),
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39 | #if ENABLE_FEATURE_CP_LONG_OPTIONS
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40 | OPT_parents = 1 << (sizeof(FILEUTILS_CP_OPTSTR)+3),
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41 | #endif
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42 | };
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43 |
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44 | // Need at least two arguments
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45 | // Soft- and hardlinking doesn't mix
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46 | // -P and -d are the same (-P is POSIX, -d is GNU)
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47 | // -r and -R are the same
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48 | // -R (and therefore -r) turns on -d (coreutils does this)
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49 | // -a = -pdR
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50 | opt_complementary = "-2:l--s:s--l:Pd:rRd:Rd:apdR";
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51 | #if ENABLE_FEATURE_CP_LONG_OPTIONS
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52 | applet_long_options =
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53 | "archive\0" No_argument "a"
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54 | "force\0" No_argument "f"
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55 | "interactive\0" No_argument "i"
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56 | "link\0" No_argument "l"
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57 | "dereference\0" No_argument "L"
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58 | "no-dereference\0" No_argument "P"
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59 | "recursive\0" No_argument "R"
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60 | "symbolic-link\0" No_argument "s"
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61 | "verbose\0" No_argument "v"
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62 | "parents\0" No_argument "\xff"
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63 | ;
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64 | #endif
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65 | // -v (--verbose) is ignored
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66 | flags = getopt32(argv, FILEUTILS_CP_OPTSTR "arPv");
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67 | /* Options of cp from GNU coreutils 6.10:
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68 | * -a, --archive
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69 | * -f, --force
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70 | * -i, --interactive
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71 | * -l, --link
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72 | * -L, --dereference
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73 | * -P, --no-dereference
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74 | * -R, -r, --recursive
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75 | * -s, --symbolic-link
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76 | * -v, --verbose
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77 | * -H follow command-line symbolic links in SOURCE
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78 | * -d same as --no-dereference --preserve=links
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79 | * -p same as --preserve=mode,ownership,timestamps
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80 | * -c same as --preserve=context
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81 | * --parents
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82 | * use full source file name under DIRECTORY
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83 | * NOT SUPPORTED IN BBOX:
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84 | * --backup[=CONTROL]
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85 | * make a backup of each existing destination file
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86 | * -b like --backup but does not accept an argument
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87 | * --copy-contents
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88 | * copy contents of special files when recursive
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89 | * --preserve[=ATTR_LIST]
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90 | * preserve attributes (default: mode,ownership,timestamps),
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91 | * if possible additional attributes: security context,links,all
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92 | * --no-preserve=ATTR_LIST
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93 | * --remove-destination
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94 | * remove each existing destination file before attempting to open
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95 | * --sparse=WHEN
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96 | * control creation of sparse files
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97 | * --strip-trailing-slashes
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98 | * remove any trailing slashes from each SOURCE argument
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99 | * -S, --suffix=SUFFIX
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100 | * override the usual backup suffix
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101 | * -t, --target-directory=DIRECTORY
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102 | * copy all SOURCE arguments into DIRECTORY
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103 | * -T, --no-target-directory
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104 | * treat DEST as a normal file
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105 | * -u, --update
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106 | * copy only when the SOURCE file is newer than the destination
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107 | * file or when the destination file is missing
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108 | * -x, --one-file-system
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109 | * stay on this file system
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110 | * -Z, --context=CONTEXT
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111 | * (SELinux) set SELinux security context of copy to CONTEXT
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112 | */
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113 | argc -= optind;
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114 | argv += optind;
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115 | /* Reverse this bit. If there is -d, bit is not set: */
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116 | flags ^= FILEUTILS_DEREFERENCE;
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117 | /* coreutils 6.9 compat:
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118 | * by default, "cp" derefs symlinks (creates regular dest files),
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119 | * but "cp -R" does not. We switch off deref if -r or -R (see above).
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120 | * However, "cp -RL" must still deref symlinks: */
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121 | if (flags & FILEUTILS_DEREF_SOFTLINK) /* -L */
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122 | flags |= FILEUTILS_DEREFERENCE;
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123 |
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124 | #if ENABLE_SELINUX
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125 | if (flags & FILEUTILS_PRESERVE_SECURITY_CONTEXT) {
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126 | selinux_or_die();
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127 | }
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128 | #endif
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129 |
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130 | status = EXIT_SUCCESS;
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131 | last = argv[argc - 1];
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132 | /* If there are only two arguments and... */
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133 | if (argc == 2) {
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134 | s_flags = cp_mv_stat2(*argv, &source_stat,
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135 | (flags & FILEUTILS_DEREFERENCE) ? stat : lstat);
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136 | if (s_flags < 0)
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137 | return EXIT_FAILURE;
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138 | d_flags = cp_mv_stat(last, &dest_stat);
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139 | if (d_flags < 0)
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140 | return EXIT_FAILURE;
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141 |
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142 | #if ENABLE_FEATURE_CP_LONG_OPTIONS
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143 | if (flags & OPT_parents) {
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144 | if (!(d_flags & 2)) {
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145 | bb_error_msg_and_die("with --parents, the destination must be a directory");
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146 | }
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147 | }
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148 | #endif
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149 |
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150 | /* ...if neither is a directory... */
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151 | if (!((s_flags | d_flags) & 2)
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152 | /* ...or: recursing, the 1st is a directory, and the 2nd doesn't exist... */
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153 | || ((flags & FILEUTILS_RECUR) && (s_flags & 2) && !d_flags)
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154 | ) {
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155 | /* Do a simple copy */
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156 | dest = last;
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157 | goto DO_COPY; /* NB: argc==2 -> *++argv==last */
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158 | }
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159 | }
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160 |
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161 | while (1) {
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162 | #if ENABLE_FEATURE_CP_LONG_OPTIONS
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163 | if (flags & OPT_parents) {
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164 | char *dest_dup;
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165 | char *dest_dir;
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166 | dest = concat_path_file(last, *argv);
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167 | dest_dup = xstrdup(dest);
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168 | dest_dir = dirname(dest_dup);
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169 | if (bb_make_directory(dest_dir, -1, FILEUTILS_RECUR)) {
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170 | return EXIT_FAILURE;
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171 | }
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172 | free(dest_dup);
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173 | goto DO_COPY;
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174 | }
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175 | #endif
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176 | dest = concat_path_file(last, bb_get_last_path_component_strip(*argv));
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177 | DO_COPY:
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178 | if (copy_file(*argv, dest, flags) < 0) {
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179 | status = EXIT_FAILURE;
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180 | }
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181 | if (*++argv == last) {
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182 | /* possibly leaking dest... */
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183 | break;
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184 | }
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185 | /* don't move up: dest may be == last and not malloced! */
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186 | free((void*)dest);
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187 | }
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188 |
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189 | /* Exit. We are NOEXEC, not NOFORK. We do exit at the end of main() */
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190 | return status;
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191 | }
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