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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #ifdef HAVE_CONFIG_H |
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24 #include <config.h> |
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25 #endif |
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26 |
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27 #include <cerrno> |
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28 #include <cstdio> |
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29 #include <cstdlib> |
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30 #include <cstring> |
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31 |
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32 #include <iostream> |
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33 |
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34 #ifdef HAVE_SYS_TYPES_H |
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35 #include <sys/types.h> |
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36 #endif |
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37 |
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38 #ifdef HAVE_UNISTD_H |
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39 #include <unistd.h> |
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40 #endif |
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41 |
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42 #include "file-ops.h" |
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43 #include "oct-env.h" |
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44 #include "oct-passwd.h" |
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45 #include "statdefs.h" |
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46 #include "str-vec.h" |
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47 |
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48 #define NOT_SUPPORTED(nm) \ |
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49 nm ## ": not supported on this system" |
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50 |
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51 // We provide a replacement for mkdir(). |
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52 |
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53 int |
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54 file_ops::mkdir (const string& name, mode_t mode) |
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55 { |
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56 string msg; |
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57 return mkdir (name, mode, msg); |
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58 } |
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59 |
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60 int |
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61 file_ops::mkdir (const string& name, mode_t mode, string& msg) |
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62 { |
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63 msg = string (); |
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64 |
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65 int status = -1; |
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66 |
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67 #if defined (HAVE_MKDIR) |
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68 status = ::mkdir (name.c_str (), mode); |
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69 |
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70 if (status < 0) |
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71 msg = ::strerror (errno); |
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72 #else |
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73 msg = NOT_SUPPORTED ("mkdir"); |
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74 #endif |
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75 |
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76 return status; |
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77 } |
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78 |
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79 // I don't know how to emulate this on systems that don't provide it. |
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80 |
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81 int |
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82 file_ops::mkfifo (const string& name, mode_t mode) |
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83 { |
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84 string msg; |
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85 return mkfifo (name, mode, msg); |
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86 } |
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87 |
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88 int |
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89 file_ops::mkfifo (const string& name, mode_t mode, string& msg) |
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90 { |
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91 msg = string (); |
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92 |
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93 int status = -1; |
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94 |
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95 #if defined (HAVE_MKFIFO) |
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96 status = ::mkfifo (name.c_str (), mode); |
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97 |
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98 if (status < 0) |
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99 msg = ::strerror (errno); |
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100 #else |
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101 msg = NOT_SUPPORTED ("mkfifo"); |
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102 #endif |
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103 |
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104 return status; |
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105 } |
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106 |
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107 // We provide a replacement for rename(). |
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108 |
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109 int |
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110 file_ops::rename (const string& from, const string& to) |
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111 { |
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112 string msg; |
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113 return rename (from, to, msg); |
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114 } |
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115 |
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116 int |
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117 file_ops::rename (const string& from, const string& to, string& msg) |
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118 { |
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119 int status = -1; |
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120 |
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121 msg = string (); |
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122 |
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123 #if defined (HAVE_RENAME) |
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124 status = ::rename (from.c_str (), to.c_str ()); |
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125 |
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126 if (status < 0) |
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127 msg = ::strerror (errno); |
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128 #else |
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129 msg = NOT_SUPPORTED ("rename"); |
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130 #endif |
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131 |
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132 return status; |
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133 } |
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134 |
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135 // We provide a replacement for rmdir(). |
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136 |
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137 int |
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138 file_ops::rmdir (const string& name) |
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139 { |
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140 string msg; |
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141 return rmdir (name, msg); |
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142 } |
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143 |
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144 int |
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145 file_ops::rmdir (const string& name, string& msg) |
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146 { |
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147 msg = string (); |
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148 |
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149 int status = -1; |
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150 |
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151 #if defined (HAVE_RMDIR) |
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152 status = ::rmdir (name.c_str ()); |
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153 |
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154 if (status < 0) |
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155 msg = ::strerror (errno); |
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156 #else |
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157 msg = NOT_SUPPORTED ("rmdir"); |
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158 #endif |
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159 |
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160 return status; |
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161 } |
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162 |
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163 // We provide a replacement for tempnam(). |
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164 |
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165 string |
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166 file_ops::tempnam (const string& dir, const string& pfx) |
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167 { |
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168 string msg; |
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169 return tempnam (dir, pfx, msg); |
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170 } |
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171 |
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172 string |
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173 file_ops::tempnam (const string& dir, const string& pfx, string& msg) |
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174 { |
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175 msg = string (); |
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176 |
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177 string retval; |
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178 |
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179 const char *pdir = dir.empty () ? 0 : dir.c_str (); |
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180 |
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181 const char *ppfx = pfx.empty () ? 0 : pfx.c_str (); |
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182 |
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183 char *tmp = ::tempnam (pdir, ppfx); |
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184 |
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185 if (tmp) |
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186 { |
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187 retval = tmp; |
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188 |
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189 ::free (tmp); |
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190 } |
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191 else |
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192 msg = ::strerror (errno); |
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193 |
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194 return retval; |
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195 } |
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196 |
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197 // The following tilde-expansion code was stolen and adapted from |
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198 // readline. |
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199 |
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200 // XXX FIXME XXX |
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201 #define DIR_SEP_CHAR '/' |
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202 |
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203 // The default value of tilde_additional_prefixes. This is set to |
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204 // whitespace preceding a tilde so that simple programs which do not |
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205 // perform any word separation get desired behaviour. |
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206 static const char *default_prefixes[] = { " ~", "\t~", ":~", 0 }; |
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207 |
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208 // The default value of tilde_additional_suffixes. This is set to |
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209 // whitespace or newline so that simple programs which do not perform |
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210 // any word separation get desired behaviour. |
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211 static const char *default_suffixes[] = { " ", "\n", ":", 0 }; |
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212 |
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213 // If non-null, this contains the address of a function that the |
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214 // application wants called before trying the standard tilde |
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215 // expansions. The function is called with the text sans tilde, and |
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216 // returns a malloc()'ed string which is the expansion, or a NULL |
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217 // pointer if the expansion fails. |
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218 file_ops::tilde_expansion_hook file_ops::tilde_expansion_preexpansion_hook = 0; |
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219 |
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220 // If non-null, this contains the address of a function to call if the |
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221 // standard meaning for expanding a tilde fails. The function is |
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222 // called with the text (sans tilde, as in "foo"), and returns a |
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223 // malloc()'ed string which is the expansion, or a NULL pointer if |
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224 // there is no expansion. |
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225 file_ops::tilde_expansion_hook file_ops::tilde_expansion_failure_hook = 0; |
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226 |
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227 // When non-null, this is a NULL terminated array of strings which are |
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228 // duplicates for a tilde prefix. Bash uses this to expand `=~' and |
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229 // `:~'. |
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230 string_vector file_ops::tilde_additional_prefixes = default_prefixes; |
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231 |
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232 // When non-null, this is a NULL terminated array of strings which |
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233 // match the end of a username, instead of just "/". Bash sets this |
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234 // to `:' and `=~'. |
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235 string_vector file_ops::tilde_additional_suffixes = default_suffixes; |
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236 |
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237 // Find the start of a tilde expansion in S, and return the index |
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238 // of the tilde which starts the expansion. Place the length of the |
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239 // text which identified this tilde starter in LEN, excluding the |
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240 // tilde itself. |
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241 |
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242 static size_t |
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243 tilde_find_prefix (const string& s, size_t& len) |
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244 { |
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245 len = 0; |
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246 |
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247 size_t s_len = s.length (); |
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248 |
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249 if (s_len == 0 || s[0] == '~') |
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250 return 0; |
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251 |
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252 string_vector prefixes = file_ops::tilde_additional_prefixes; |
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253 |
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254 if (! prefixes.empty ()) |
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255 { |
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256 for (size_t i = 0; i < s_len; i++) |
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257 { |
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258 for (int j = 0; j < prefixes.length (); j++) |
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259 { |
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260 size_t pfx_len = prefixes[j].length (); |
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261 |
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262 if (prefixes[j].compare (s.substr (i, pfx_len)) == 0) |
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263 { |
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264 len = pfx_len - 1; |
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265 return i + len; |
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266 } |
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267 } |
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268 } |
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269 } |
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270 |
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271 return s_len; |
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272 } |
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273 |
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274 // Find the end of a tilde expansion in S, and return the index |
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275 // of the character which ends the tilde definition. |
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276 |
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277 static size_t |
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278 tilde_find_suffix (const string& s) |
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279 { |
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280 size_t s_len = s.length (); |
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281 |
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282 string_vector suffixes = file_ops::tilde_additional_suffixes; |
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283 |
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284 size_t i = 0; |
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285 |
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286 for ( ; i < s_len; i++) |
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287 { |
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288 if (s[i] == DIR_SEP_CHAR) |
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289 break; |
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290 |
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291 if (! suffixes.empty ()) |
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292 { |
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293 for (int j = 0; j < suffixes.length (); j++) |
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294 { |
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295 size_t sfx_len = suffixes[j].length (); |
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296 |
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297 if (suffixes[j].compare (s.substr (i, sfx_len)) == 0) |
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298 return i; |
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299 } |
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300 } |
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301 } |
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302 |
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303 return i; |
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304 } |
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305 |
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306 // Take FNAME and return the tilde prefix we want expanded. |
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307 |
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308 static string |
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309 isolate_tilde_prefix (const string& fname) |
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310 { |
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311 size_t f_len = fname.length (); |
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312 |
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313 size_t len = 1; |
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314 |
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315 while (len < f_len && fname[len] != DIR_SEP_CHAR) |
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316 len++; |
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317 |
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318 return fname.substr (1, len); |
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319 } |
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320 |
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321 // Do the work of tilde expansion on FILENAME. FILENAME starts with a |
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322 // tilde. |
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323 |
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324 static string |
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325 tilde_expand_word (const string& filename) |
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326 { |
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327 size_t f_len = filename.length (); |
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328 |
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329 if (f_len == 0 || filename[0] != '~') |
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330 return filename; |
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331 |
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332 // A leading `~/' or a bare `~' is *always* translated to the value |
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333 // of $HOME or the home directory of the current user, regardless of |
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334 // any preexpansion hook. |
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335 |
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336 if (f_len == 1 || filename[1] == DIR_SEP_CHAR) |
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337 return octave_env::get_home_directory () + filename.substr (1); |
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338 |
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339 string username = isolate_tilde_prefix (filename); |
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340 |
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341 size_t user_len = username.length (); |
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342 |
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343 string dirname; |
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344 |
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345 if (file_ops::tilde_expansion_preexpansion_hook) |
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346 { |
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347 string expansion |
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348 = file_ops::tilde_expansion_preexpansion_hook (username); |
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349 |
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350 if (! expansion.empty ()) |
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351 return expansion + filename.substr (user_len+1); |
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352 } |
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353 |
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354 // No preexpansion hook, or the preexpansion hook failed. Look in the |
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355 // password database. |
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356 |
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357 octave_passwd pw = octave_passwd::getpwnam (username); |
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358 |
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359 if (! pw) |
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360 { |
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361 // If the calling program has a special syntax for expanding tildes, |
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362 // and we couldn't find a standard expansion, then let them try. |
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363 |
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364 if (file_ops::tilde_expansion_failure_hook) |
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365 { |
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366 string expansion |
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367 = file_ops::tilde_expansion_failure_hook (username); |
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368 |
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369 if (! expansion.empty ()) |
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370 dirname = expansion + filename.substr (user_len+1); |
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371 } |
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372 |
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373 // If we don't have a failure hook, or if the failure hook did not |
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374 // expand the tilde, return a copy of what we were passed. |
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375 |
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376 if (dirname.length () == 0) |
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377 dirname = filename; |
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378 } |
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379 else |
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380 dirname = pw.dir () + filename.substr (user_len+1); |
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381 |
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382 return dirname; |
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383 } |
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384 |
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385 // If NAME has a leading ~ or ~user, Unix-style, expand it to the |
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386 // user's home directory. If no ~, or no <pwd.h>, just return NAME. |
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387 |
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388 string |
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389 file_ops::tilde_expand (const string& name) |
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390 { |
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391 string result; |
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392 |
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393 size_t name_len = name.length (); |
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394 |
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395 // Scan through S expanding tildes as we come to them. |
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396 |
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397 size_t pos = 0; |
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398 |
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399 while (1) |
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400 { |
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401 if (pos > name_len) |
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402 break; |
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403 |
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404 size_t len; |
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405 |
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406 // Make START point to the tilde which starts the expansion. |
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407 |
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408 size_t start = tilde_find_prefix (name.substr (pos), len); |
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409 |
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410 result.append (name.substr (pos, start)); |
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411 |
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412 // Advance STRING to the starting tilde. |
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413 |
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414 pos += start; |
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415 |
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416 // Make FINI be the index of one after the last character of the |
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417 // username. |
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418 |
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419 size_t fini = tilde_find_suffix (name.substr (pos)); |
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420 |
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421 // If both START and FINI are zero, we are all done. |
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422 |
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423 if (! (start || fini)) |
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424 break; |
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425 |
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426 // Expand the entire tilde word, and copy it into RESULT. |
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427 |
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428 string tilde_word = name.substr (pos, fini); |
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429 |
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430 pos += fini; |
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431 |
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432 string expansion = tilde_expand_word (tilde_word); |
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433 |
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434 result.append (expansion); |
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435 } |
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436 |
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437 return result; |
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438 } |
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439 |
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440 // A vector version of the above. |
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441 |
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442 string_vector |
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443 file_ops::tilde_expand (const string_vector& names) |
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444 { |
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445 string_vector retval; |
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446 |
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447 int n = names.length (); |
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448 |
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449 retval.resize (n); |
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450 |
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451 for (int i = 0; i < n; i++) |
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452 retval[i] = file_ops::tilde_expand (names[i]); |
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453 |
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454 return retval; |
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455 } |
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456 |
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1765
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457 int |
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2926
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458 file_ops::umask (mode_t mode) |
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1765
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459 { |
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460 #if defined (HAVE_UMASK) |
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461 return ::umask (mode); |
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462 #else |
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463 return 0; |
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464 #endif |
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465 } |
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466 |
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1773
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467 int |
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2926
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468 file_ops::unlink (const string& name) |
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1773
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469 { |
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2937
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470 string msg; |
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471 return unlink (name, msg); |
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1773
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472 } |
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473 |
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2668
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474 int |
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2937
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475 file_ops::unlink (const string& name, string& msg) |
|
2668
|
476 { |
|
2937
|
477 msg = string (); |
|
2668
|
478 |
|
2937
|
479 int status = -1; |
|
|
480 |
|
|
481 #if defined (HAVE_UNLINK) |
|
|
482 status = ::unlink (name.c_str ()); |
|
2668
|
483 |
|
|
484 if (status < 0) |
|
2937
|
485 msg = ::strerror (errno); |
|
|
486 #else |
|
|
487 msg = NOT_SUPPORTED ("unlink"); |
|
|
488 #endif |
|
2668
|
489 |
|
|
490 return status; |
|
|
491 } |
|
|
492 |
|
1765
|
493 /* |
|
|
494 ;;; Local Variables: *** |
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|
495 ;;; mode: C++ *** |
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|
496 ;;; End: *** |
|
|
497 */ |
