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1 /* filemode.c -- make a string describing file modes |
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2 Copyright (C) 1985, 1990 Free Software Foundation, Inc. |
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3 |
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4 This program is free software; you can redistribute it and/or modify |
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5 it under the terms of the GNU General Public License as published by |
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6 the Free Software Foundation; either version 2, or (at your option) |
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7 any later version. |
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8 |
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9 This program is distributed in the hope that it will be useful, |
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 GNU General Public License for more details. |
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13 |
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14 You should have received a copy of the GNU General Public License |
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15 along with this program; if not, write to the Free Software |
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16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
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17 |
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18 #include <sys/types.h> |
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19 #include <sys/stat.h> |
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20 #ifndef S_IREAD |
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21 #define S_IREAD S_IRUSR |
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22 #define S_IWRITE S_IWUSR |
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23 #define S_IEXEC S_IXUSR |
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24 #endif |
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25 #ifndef S_ISREG /* Doesn't have POSIX.1 stat stuff. */ |
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26 #define mode_t unsigned short |
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27 #endif |
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28 #if !defined(S_ISBLK) && defined(S_IFBLK) |
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29 #define S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK) |
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30 #endif |
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31 #if !defined(S_ISCHR) && defined(S_IFCHR) |
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32 #define S_ISCHR(m) (((m) & S_IFMT) == S_IFCHR) |
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33 #endif |
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34 #if !defined(S_ISDIR) && defined(S_IFDIR) |
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35 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR) |
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36 #endif |
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37 #if !defined(S_ISREG) && defined(S_IFREG) |
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38 #define S_ISREG(m) (((m) & S_IFMT) == S_IFREG) |
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39 #endif |
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40 #if !defined(S_ISFIFO) && defined(S_IFIFO) |
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41 #define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO) |
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42 #endif |
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43 #if !defined(S_ISLNK) && defined(S_IFLNK) |
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44 #define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK) |
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45 #endif |
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46 #if !defined(S_ISSOCK) && defined(S_IFSOCK) |
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47 #define S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK) |
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48 #endif |
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49 #if !defined(S_ISMPB) && defined(S_IFMPB) /* V7 */ |
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50 #define S_ISMPB(m) (((m) & S_IFMT) == S_IFMPB) |
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51 #define S_ISMPC(m) (((m) & S_IFMT) == S_IFMPC) |
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52 #endif |
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53 #if !defined(S_ISNWK) && defined(S_IFNWK) /* HP/UX */ |
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54 #define S_ISNWK(m) (((m) & S_IFMT) == S_IFNWK) |
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55 #endif |
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56 |
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57 void mode_string (); |
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58 static char ftypelet (); |
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59 static void rwx (); |
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60 static void setst (); |
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61 |
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62 /* filemodestring - fill in string STR with an ls-style ASCII |
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63 representation of the st_mode field of file stats block STATP. |
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64 10 characters are stored in STR; no terminating null is added. |
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65 The characters stored in STR are: |
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66 |
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67 0 File type. 'd' for directory, 'c' for character |
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68 special, 'b' for block special, 'm' for multiplex, |
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69 'l' for symbolic link, 's' for socket, 'p' for fifo, |
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70 '-' for regular, '?' for any other file type |
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71 |
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72 1 'r' if the owner may read, '-' otherwise. |
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73 |
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74 2 'w' if the owner may write, '-' otherwise. |
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75 |
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76 3 'x' if the owner may execute, 's' if the file is |
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77 set-user-id, '-' otherwise. |
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78 'S' if the file is set-user-id, but the execute |
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79 bit isn't set. |
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80 |
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81 4 'r' if group members may read, '-' otherwise. |
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82 |
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83 5 'w' if group members may write, '-' otherwise. |
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84 |
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85 6 'x' if group members may execute, 's' if the file is |
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86 set-group-id, '-' otherwise. |
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87 'S' if it is set-group-id but not executable. |
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88 |
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89 7 'r' if any user may read, '-' otherwise. |
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90 |
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91 8 'w' if any user may write, '-' otherwise. |
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92 |
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93 9 'x' if any user may execute, 't' if the file is "sticky" |
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94 (will be retained in swap space after execution), '-' |
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95 otherwise. |
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96 'T' if the file is sticky but not executable. */ |
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97 |
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98 void |
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99 filemodestring (statp, str) |
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100 struct stat *statp; |
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101 char *str; |
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102 { |
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103 mode_string (statp->st_mode, str); |
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104 } |
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105 |
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106 /* Like filemodestring, but only the relevant part of the `struct stat' |
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107 is given as an argument. */ |
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108 |
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109 void |
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110 mode_string (mode, str) |
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111 unsigned short mode; |
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112 char *str; |
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113 { |
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114 str[0] = ftypelet (mode); |
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115 rwx ((mode & 0700) << 0, &str[1]); |
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116 rwx ((mode & 0070) << 3, &str[4]); |
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117 rwx ((mode & 0007) << 6, &str[7]); |
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118 setst (mode, str); |
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119 } |
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120 |
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121 /* Return a character indicating the type of file described by |
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122 file mode BITS: |
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123 'd' for directories |
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124 'b' for block special files |
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125 'c' for character special files |
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126 'm' for multiplexor files |
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127 'l' for symbolic links |
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128 's' for sockets |
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129 'p' for fifos |
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130 '-' for regular files |
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131 '?' for any other file type. */ |
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132 |
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133 static char |
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134 ftypelet (bits) |
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135 mode_t bits; |
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136 { |
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137 #ifdef S_ISBLK |
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138 if (S_ISBLK (bits)) |
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139 return 'b'; |
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140 #endif |
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141 if (S_ISCHR (bits)) |
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142 return 'c'; |
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143 if (S_ISDIR (bits)) |
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144 return 'd'; |
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145 if (S_ISREG (bits)) |
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146 return '-'; |
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147 #ifdef S_ISFIFO |
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148 if (S_ISFIFO (bits)) |
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149 return 'p'; |
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150 #endif |
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151 #ifdef S_ISLNK |
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152 if (S_ISLNK (bits)) |
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153 return 'l'; |
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154 #endif |
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155 #ifdef S_ISSOCK |
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156 if (S_ISSOCK (bits)) |
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157 return 's'; |
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158 #endif |
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159 #ifdef S_ISMPC |
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160 if (S_ISMPC (bits)) |
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161 return 'm'; |
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162 #endif |
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163 #ifdef S_ISNWK |
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164 if (S_ISNWK (bits)) |
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165 return 'n'; |
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166 #endif |
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167 return '?'; |
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168 } |
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169 |
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170 /* Look at read, write, and execute bits in BITS and set |
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171 flags in CHARS accordingly. */ |
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172 |
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173 static void |
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174 rwx (bits, chars) |
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175 unsigned short bits; |
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176 char *chars; |
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177 { |
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178 chars[0] = (bits & S_IREAD) ? 'r' : '-'; |
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179 chars[1] = (bits & S_IWRITE) ? 'w' : '-'; |
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180 chars[2] = (bits & S_IEXEC) ? 'x' : '-'; |
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181 } |
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182 |
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183 /* Set the 's' and 't' flags in file attributes string CHARS, |
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184 according to the file mode BITS. */ |
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185 |
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186 static void |
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187 setst (bits, chars) |
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188 unsigned short bits; |
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189 char *chars; |
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190 { |
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191 #ifdef S_ISUID |
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192 if (bits & S_ISUID) |
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193 { |
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194 if (chars[3] != 'x') |
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195 /* Set-uid, but not executable by owner. */ |
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196 chars[3] = 'S'; |
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197 else |
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198 chars[3] = 's'; |
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199 } |
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200 #endif |
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201 #ifdef S_ISGID |
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202 if (bits & S_ISGID) |
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203 { |
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204 if (chars[6] != 'x') |
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205 /* Set-gid, but not executable by group. */ |
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206 chars[6] = 'S'; |
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207 else |
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208 chars[6] = 's'; |
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209 } |
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210 #endif |
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211 #ifdef S_ISVTX |
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212 if (bits & S_ISVTX) |
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213 { |
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214 if (chars[9] != 'x') |
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215 /* Sticky, but not executable by others. */ |
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216 chars[9] = 'T'; |
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217 else |
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218 chars[9] = 't'; |
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219 } |
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220 #endif |
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221 } |
