1 | /* Utility to pick a temporary filename prefix. |
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2 | Copyright (C) 1996, 1997, 1998, 2001, 2009, 2010 |
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3 | Free Software Foundation, Inc. |
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4 | |
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5 | This file is part of the libiberty library. |
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6 | Libiberty is free software; you can redistribute it and/or |
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7 | modify it under the terms of the GNU Library General Public |
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8 | License as published by the Free Software Foundation; either |
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9 | version 2 of the License, or (at your option) any later version. |
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10 | |
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11 | Libiberty is distributed in the hope that it will be useful, |
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 | Library General Public License for more details. |
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15 | |
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16 | You should have received a copy of the GNU Library General Public |
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17 | License along with libiberty; see the file COPYING.LIB. If not, |
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18 | write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, |
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19 | Boston, MA 02110-1301, USA. */ |
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20 | |
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21 | #ifdef HAVE_CONFIG_H |
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22 | #include "config.h" |
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23 | #endif |
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24 | |
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25 | #include <stdio.h> /* May get P_tmpdir. */ |
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26 | #include <sys/types.h> |
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27 | #include <errno.h> |
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28 | #ifdef HAVE_UNISTD_H |
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29 | #include <unistd.h> |
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30 | #endif |
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31 | #ifdef HAVE_STDLIB_H |
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32 | #include <stdlib.h> |
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33 | #endif |
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34 | #ifdef HAVE_STRING_H |
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35 | #include <string.h> |
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36 | #endif |
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37 | #ifdef HAVE_SYS_FILE_H |
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38 | #include <sys/file.h> /* May get R_OK, etc. on some systems. */ |
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39 | #endif |
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40 | #if defined(_WIN32) && !defined(__CYGWIN__) |
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41 | #include <windows.h> |
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42 | #endif |
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43 | |
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44 | #ifndef R_OK |
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45 | #define R_OK 4 |
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46 | #define W_OK 2 |
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47 | #define X_OK 1 |
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48 | #endif |
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49 | |
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50 | #include "libiberty.h" |
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51 | extern int mkstemps (char *, int); |
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52 | |
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53 | /* '/' works just fine on MS-DOS based systems. */ |
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54 | #ifndef DIR_SEPARATOR |
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55 | #define DIR_SEPARATOR '/' |
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56 | #endif |
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57 | |
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58 | /* Name of temporary file. |
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59 | mktemp requires 6 trailing X's. */ |
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60 | #define TEMP_FILE "rld--XXXXXX" |
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61 | #define TEMP_FILE_LEN (sizeof(TEMP_FILE) - 1) |
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62 | |
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63 | #if !defined(_WIN32) || defined(__CYGWIN__) |
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64 | |
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65 | /* Subroutine of choose_tmpdir. |
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66 | If BASE is non-NULL, return it. |
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67 | Otherwise it checks if DIR is a usable directory. |
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68 | If success, DIR is returned. |
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69 | Otherwise NULL is returned. */ |
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70 | |
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71 | static inline const char *try_dir (const char *, const char *); |
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72 | |
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73 | static inline const char * |
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74 | try_dir (const char *dir, const char *base) |
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75 | { |
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76 | if (base != 0) |
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77 | return base; |
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78 | if (dir != 0 |
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79 | && access (dir, R_OK | W_OK | X_OK) == 0) |
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80 | return dir; |
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81 | return 0; |
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82 | } |
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83 | |
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84 | static const char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 }; |
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85 | static const char usrtmp[] = |
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86 | { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 }; |
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87 | static const char vartmp[] = |
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88 | { DIR_SEPARATOR, 'v', 'a', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 }; |
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89 | |
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90 | #endif |
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91 | |
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92 | static char *memoized_tmpdir; |
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93 | |
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94 | /* |
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95 | |
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96 | @deftypefn Replacement char* choose_tmpdir () |
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97 | |
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98 | Returns a pointer to a directory path suitable for creating temporary |
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99 | files in. |
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100 | |
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101 | @end deftypefn |
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102 | |
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103 | */ |
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104 | |
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105 | char * |
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106 | choose_tmpdir (void) |
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107 | { |
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108 | if (!memoized_tmpdir) |
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109 | { |
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110 | #if !defined(_WIN32) || defined(__CYGWIN__) |
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111 | const char *base = 0; |
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112 | char *tmpdir; |
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113 | unsigned int len; |
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114 | |
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115 | #ifdef VMS |
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116 | /* Try VMS standard temp logical. */ |
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117 | base = try_dir ("/sys$scratch", base); |
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118 | #else |
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119 | base = try_dir (getenv ("TMPDIR"), base); |
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120 | base = try_dir (getenv ("TMP"), base); |
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121 | base = try_dir (getenv ("TEMP"), base); |
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122 | #endif |
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123 | |
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124 | #ifdef P_tmpdir |
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125 | /* We really want a directory name here as if concatenated with say \dir |
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126 | we do not end up with a double \\ which defines an UNC path. */ |
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127 | if (strcmp (P_tmpdir, "\\") == 0) |
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128 | base = try_dir ("\\.", base); |
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129 | else |
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130 | base = try_dir (P_tmpdir, base); |
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131 | #endif |
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132 | |
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133 | /* Try /var/tmp, /usr/tmp, then /tmp. */ |
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134 | base = try_dir (vartmp, base); |
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135 | base = try_dir (usrtmp, base); |
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136 | base = try_dir (tmp, base); |
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137 | |
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138 | /* If all else fails, use the current directory! */ |
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139 | if (base == 0) |
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140 | base = "."; |
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141 | /* Append DIR_SEPARATOR to the directory we've chosen |
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142 | and return it. */ |
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143 | len = strlen (base); |
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144 | tmpdir = XNEWVEC (char, len + 2); |
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145 | strcpy (tmpdir, base); |
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146 | tmpdir[len] = DIR_SEPARATOR; |
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147 | tmpdir[len+1] = '\0'; |
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148 | memoized_tmpdir = tmpdir; |
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149 | #else /* defined(_WIN32) && !defined(__CYGWIN__) */ |
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150 | DWORD len; |
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151 | |
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152 | /* Figure out how much space we need. */ |
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153 | len = GetTempPath(0, NULL); |
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154 | if (len) |
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155 | { |
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156 | memoized_tmpdir = XNEWVEC (char, len); |
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157 | if (!GetTempPath(len, memoized_tmpdir)) |
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158 | { |
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159 | XDELETEVEC (memoized_tmpdir); |
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160 | memoized_tmpdir = NULL; |
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161 | } |
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162 | } |
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163 | if (!memoized_tmpdir) |
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164 | /* If all else fails, use the current directory. */ |
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165 | memoized_tmpdir = xstrdup (".\\"); |
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166 | #endif /* defined(_WIN32) && !defined(__CYGWIN__) */ |
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167 | } |
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168 | |
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169 | return memoized_tmpdir; |
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170 | } |
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171 | |
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172 | /* |
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173 | |
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174 | @deftypefn Replacement char* make_temp_file (const char *@var{suffix}) |
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175 | |
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176 | Return a temporary file name (as a string) or @code{NULL} if unable to |
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177 | create one. @var{suffix} is a suffix to append to the file name. The |
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178 | string is @code{malloc}ed, and the temporary file has been created. |
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179 | |
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180 | @end deftypefn |
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181 | |
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182 | */ |
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183 | |
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184 | char * |
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185 | make_temp_file (const char *suffix) |
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186 | { |
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187 | const char *base = choose_tmpdir (); |
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188 | char *temp_filename; |
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189 | int base_len, suffix_len; |
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190 | int fd; |
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191 | |
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192 | if (suffix == 0) |
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193 | suffix = ""; |
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194 | |
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195 | base_len = strlen (base); |
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196 | suffix_len = strlen (suffix); |
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197 | |
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198 | temp_filename = XNEWVEC (char, base_len |
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199 | + TEMP_FILE_LEN |
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200 | + suffix_len + 1); |
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201 | strcpy (temp_filename, base); |
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202 | strcpy (temp_filename + base_len, TEMP_FILE); |
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203 | strcpy (temp_filename + base_len + TEMP_FILE_LEN, suffix); |
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204 | |
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205 | fd = mkstemps (temp_filename, suffix_len); |
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206 | /* Mkstemps failed. It may be EPERM, ENOSPC etc. */ |
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207 | if (fd == -1) |
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208 | { |
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209 | fprintf (stderr, "Cannot create temporary file in %s: %s\n", |
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210 | base, strerror (errno)); |
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211 | abort (); |
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212 | } |
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213 | /* We abort on failed close out of sheer paranoia. */ |
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214 | if (close (fd)) |
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215 | abort (); |
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216 | return temp_filename; |
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217 | } |
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