1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * See README for additional information
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4 | *
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5 | * This file can be redistributed under the terms of the GNU Library General
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6 | * Public License
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7 | */
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8 |
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9 | #include "libbb.h"
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10 | #include "e2fs_lib.h"
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11 |
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12 | #define HAVE_EXT2_IOCTLS 1
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13 |
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14 | #if INT_MAX == LONG_MAX
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15 | #define IF_LONG_IS_SAME(...) __VA_ARGS__
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16 | #define IF_LONG_IS_WIDER(...)
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17 | #else
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18 | #define IF_LONG_IS_SAME(...)
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19 | #define IF_LONG_IS_WIDER(...) __VA_ARGS__
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20 | #endif
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21 |
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22 | static void close_silently(int fd)
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23 | {
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24 | int e = errno;
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25 | close(fd);
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26 | errno = e;
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27 | }
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28 |
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29 |
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30 | /* Iterate a function on each entry of a directory */
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31 | int iterate_on_dir(const char *dir_name,
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32 | int (*func)(const char *, struct dirent *, void *),
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33 | void * private)
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34 | {
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35 | DIR *dir;
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36 | struct dirent *de, *dep;
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37 | int max_len, len;
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38 |
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39 | max_len = PATH_MAX + sizeof(struct dirent);
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40 | de = xmalloc(max_len+1);
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41 | memset(de, 0, max_len+1);
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42 |
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43 | dir = opendir(dir_name);
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44 | if (dir == NULL) {
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45 | free(de);
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46 | return -1;
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47 | }
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48 | while ((dep = readdir(dir))) {
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49 | len = sizeof(struct dirent);
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50 | if (len < dep->d_reclen)
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51 | len = dep->d_reclen;
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52 | if (len > max_len)
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53 | len = max_len;
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54 | memcpy(de, dep, len);
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55 | func(dir_name, de, private);
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56 | }
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57 | closedir(dir);
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58 | free(de);
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59 | return 0;
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60 | }
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61 |
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62 |
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63 | /* Get/set a file version on an ext2 file system */
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64 | int fgetsetversion(const char *name, unsigned long *get_version, unsigned long set_version)
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65 | {
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66 | #if HAVE_EXT2_IOCTLS
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67 | int fd, r;
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68 | IF_LONG_IS_WIDER(int ver;)
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69 |
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70 | fd = open(name, O_NONBLOCK);
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71 | if (fd == -1)
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72 | return -1;
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73 | if (!get_version) {
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74 | IF_LONG_IS_WIDER(
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75 | ver = (int) set_version;
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76 | r = ioctl(fd, EXT2_IOC_SETVERSION, &ver);
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77 | )
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78 | IF_LONG_IS_SAME(
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79 | r = ioctl(fd, EXT2_IOC_SETVERSION, (void*)&set_version);
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80 | )
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81 | } else {
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82 | IF_LONG_IS_WIDER(
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83 | r = ioctl(fd, EXT2_IOC_GETVERSION, &ver);
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84 | *get_version = ver;
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85 | )
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86 | IF_LONG_IS_SAME(
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87 | r = ioctl(fd, EXT2_IOC_GETVERSION, (void*)get_version);
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88 | )
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89 | }
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90 | close_silently(fd);
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91 | return r;
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92 | #else /* ! HAVE_EXT2_IOCTLS */
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93 | errno = EOPNOTSUPP;
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94 | return -1;
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95 | #endif /* ! HAVE_EXT2_IOCTLS */
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96 | }
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97 |
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98 |
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99 | /* Get/set a file flags on an ext2 file system */
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100 | int fgetsetflags(const char *name, unsigned long *get_flags, unsigned long set_flags)
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101 | {
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102 | #if HAVE_EXT2_IOCTLS
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103 | struct stat buf;
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104 | int fd, r;
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105 | IF_LONG_IS_WIDER(int f;)
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106 |
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107 | if (stat(name, &buf) == 0 /* stat is ok */
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108 | && !S_ISREG(buf.st_mode) && !S_ISDIR(buf.st_mode)
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109 | ) {
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110 | goto notsupp;
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111 | }
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112 | fd = open(name, O_NONBLOCK); /* neither read nor write asked for */
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113 | if (fd == -1)
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114 | return -1;
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115 |
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116 | if (!get_flags) {
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117 | IF_LONG_IS_WIDER(
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118 | f = (int) set_flags;
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119 | r = ioctl(fd, EXT2_IOC_SETFLAGS, &f);
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120 | )
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121 | IF_LONG_IS_SAME(
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122 | r = ioctl(fd, EXT2_IOC_SETFLAGS, (void*)&set_flags);
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123 | )
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124 | } else {
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125 | IF_LONG_IS_WIDER(
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126 | r = ioctl(fd, EXT2_IOC_GETFLAGS, &f);
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127 | *get_flags = f;
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128 | )
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129 | IF_LONG_IS_SAME(
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130 | r = ioctl(fd, EXT2_IOC_GETFLAGS, (void*)get_flags);
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131 | )
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132 | }
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133 |
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134 | close_silently(fd);
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135 | return r;
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136 | notsupp:
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137 | #endif /* HAVE_EXT2_IOCTLS */
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138 | errno = EOPNOTSUPP;
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139 | return -1;
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140 | }
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141 |
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142 |
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143 | /* Print file attributes on an ext2 file system */
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144 | struct flags_name {
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145 | unsigned long flag;
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146 | char short_name;
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147 | const char *long_name;
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148 | };
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149 |
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150 | /* TODO: apart from I and (disabled) COMPRESSION flags, this
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151 | * is a duplicate of a table from chattr. Merge? */
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152 | static const struct flags_name flags_array[] = {
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153 | { EXT2_SECRM_FL, 's', "Secure_Deletion" },
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154 | { EXT2_UNRM_FL, 'u' , "Undelete" },
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155 | { EXT2_SYNC_FL, 'S', "Synchronous_Updates" },
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156 | { EXT2_DIRSYNC_FL, 'D', "Synchronous_Directory_Updates" },
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157 | { EXT2_IMMUTABLE_FL, 'i', "Immutable" },
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158 | { EXT2_APPEND_FL, 'a', "Append_Only" },
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159 | { EXT2_NODUMP_FL, 'd', "No_Dump" },
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160 | { EXT2_NOATIME_FL, 'A', "No_Atime" },
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161 | { EXT2_COMPR_FL, 'c', "Compression_Requested" },
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162 | #ifdef ENABLE_COMPRESSION
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163 | { EXT2_COMPRBLK_FL, 'B', "Compressed_File" },
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164 | { EXT2_DIRTY_FL, 'Z', "Compressed_Dirty_File" },
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165 | { EXT2_NOCOMPR_FL, 'X', "Compression_Raw_Access" },
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166 | { EXT2_ECOMPR_FL, 'E', "Compression_Error" },
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167 | #endif
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168 | { EXT3_JOURNAL_DATA_FL, 'j', "Journaled_Data" },
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169 | { EXT2_INDEX_FL, 'I', "Indexed_directory" },
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170 | { EXT2_NOTAIL_FL, 't', "No_Tailmerging" },
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171 | { EXT2_TOPDIR_FL, 'T', "Top_of_Directory_Hierarchies" },
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172 | { 0, '\0', NULL }
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173 | };
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174 |
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175 | void print_flags(FILE *f, unsigned long flags, unsigned options)
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176 | {
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177 | const struct flags_name *fp;
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178 |
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179 | if (options & PFOPT_LONG) {
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180 | int first = 1;
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181 | for (fp = flags_array; fp->short_name; fp++) {
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182 | if (flags & fp->flag) {
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183 | if (!first)
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184 | fputs(", ", f);
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185 | fputs(fp->long_name, f);
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186 | first = 0;
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187 | }
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188 | }
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189 | if (first)
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190 | fputs("---", f);
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191 | } else {
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192 | for (fp = flags_array; fp->short_name; fp++) {
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193 | char c = '-';
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194 | if (flags & fp->flag)
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195 | c = fp->short_name;
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196 | fputc(c, f);
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197 | }
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198 | }
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199 | }
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