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