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1
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1 // utils.cc -*- C++ -*- |
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2 /* |
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3 |
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1009
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4 Copyright (C) 1992, 1993, 1994, 1995 John W. Eaton |
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1
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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1315
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20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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21 |
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22 */ |
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23 |
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240
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24 #ifdef HAVE_CONFIG_H |
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1192
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25 #include <config.h> |
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1
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26 #endif |
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27 |
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1343
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28 #include <climits> |
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1345
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29 #include <csetjmp> |
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1346
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30 #include <cstring> |
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1343
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31 |
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1728
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32 #include <string> |
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33 |
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1349
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34 #include <fstream.h> |
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35 #include <iostream.h> |
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36 #include <strstream.h> |
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37 |
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1350
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38 #ifdef HAVE_UNISTD_H |
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1
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39 #include <sys/types.h> |
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40 #include <unistd.h> |
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41 #endif |
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367
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42 |
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138
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43 #if defined (HAVE_TERMIOS_H) |
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44 #include <termios.h> |
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45 #elif defined (HAVE_TERMIO_H) |
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1
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46 #include <termio.h> |
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138
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47 #elif defined (HAVE_SGTTY_H) |
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1
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48 #include <sgtty.h> |
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49 #else |
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50 LOSE! LOSE! |
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51 #endif |
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52 |
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1465
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53 #ifndef HAVE_STRNCASECMP |
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54 extern "C" int strncasecmp (const char*, const char*, size_t); |
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55 #endif |
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1
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56 |
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57 #include "SLStack.h" |
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58 |
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1651
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59 #include "oct-cmplx.h" |
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1755
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60 #include "str-vec.h" |
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1651
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61 |
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1352
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62 #include "defun.h" |
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63 #include "dirfns.h" |
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64 #include "error.h" |
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65 #include "gripes.h" |
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66 #include "help.h" |
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67 #include "input.h" |
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68 #include "mappers.h" |
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1742
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69 #include "oct-hist.h" |
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1750
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70 #include "oct-obj.h" |
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1352
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71 #include "pager.h" |
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1155
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72 #include "pathsearch.h" |
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1690
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73 #include "sysdep.h" |
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1352
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74 #include "sysdir.h" |
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1750
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75 #include "toplev.h" |
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1
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76 #include "unwind-prot.h" |
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1352
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77 #include "user-prefs.h" |
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78 #include "utils.h" |
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79 #include "variables.h" |
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1
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80 |
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81 // Top level context (?) |
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82 extern jmp_buf toplevel; |
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83 |
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581
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84 // Save a string. |
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85 |
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1
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86 char * |
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87 strsave (const char *s) |
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88 { |
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526
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89 if (! s) |
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90 return 0; |
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1
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91 |
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92 int len = strlen (s); |
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93 char *tmp = new char [len+1]; |
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94 tmp = strcpy (tmp, s); |
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95 return tmp; |
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96 } |
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97 |
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1755
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98 #if 0 |
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99 |
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581
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100 // Concatenate two strings. |
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101 |
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1
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102 char * |
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103 strconcat (const char *s, const char *t) |
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104 { |
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105 int len = strlen (s) + strlen (t); |
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106 char *tmp = new char [len+1]; |
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107 strcpy (tmp, s); |
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1266
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108 strcat (tmp, t); |
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109 return tmp; |
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1
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110 } |
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1755
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111 #endif |
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1
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112 |
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581
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113 // Throw away input until a given character is read. |
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114 |
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1
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115 void |
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116 discard_until (istream& stream, char character) |
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117 { |
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118 int c; |
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119 for (;;) |
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120 { |
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121 stream >> c; |
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122 if (c == EOF || c == character) |
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123 break; |
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124 } |
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125 if (c != EOF) |
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126 stream.putback ((char) c); |
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127 } |
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128 |
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607
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129 #if 0 |
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130 |
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131 // XXX UNTESTED XXX |
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132 |
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133 // Read input until a given character is read. Returns characters |
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134 // read in a new string that must be freed by the caller. |
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135 |
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136 char * |
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137 read_until (istream& stream, char character) |
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138 { |
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139 int grow_size = 8; |
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140 int limit = grow_size; |
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141 char *buf = new char [limit]; |
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142 char *bp = buf; |
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143 |
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144 get_more: |
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145 is.getline (bp, limit, character); |
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146 |
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147 if (is.gcount () == 0) |
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148 { |
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149 delete [] buf; |
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150 return 0; |
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151 } |
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152 |
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153 if (is.gcount () == limit && buf[limit-1] != '\0') |
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154 { |
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155 char *tmp = new char [limit + grow_size]; |
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156 strcpy (tmp, buf); |
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157 delete [] buf; |
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158 buf = tmp; |
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159 bp = tmp + limit - 1; |
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160 limit += grow_size; |
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161 grow_size *= 2; |
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162 goto get_more; |
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163 } |
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164 |
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165 return buf; |
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166 } |
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167 #endif |
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168 |
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661
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169 // Get a temporary file name. |
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643
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170 |
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1755
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171 string |
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643
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172 octave_tmp_file_name (void) |
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173 { |
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1755
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174 string retval; |
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175 |
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176 char *tmp = tempnam (0, "oct-"); |
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662
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177 |
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1755
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178 if (tmp) |
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179 { |
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180 retval = tmp; |
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662
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181 |
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1755
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182 free (tmp); |
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183 } |
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184 else |
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661
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185 error ("can't open temporary file!"); |
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662
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186 |
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661
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187 return retval; |
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643
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188 } |
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189 |
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801
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190 DEFUN ("octave_tmp_file_name", Foctave_tmp_file_name, |
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1488
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191 Soctave_tmp_file_name, 10, |
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801
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192 "octave_tmp_file_name ()") |
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193 { |
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194 tree_constant retval; |
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195 |
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196 if (args.length () == 0) |
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197 retval = octave_tmp_file_name (); |
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198 else |
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199 print_usage ("octave_tmp_file_name"); |
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200 |
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201 return retval; |
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202 } |
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203 |
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581
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204 // Return to the main command loop in octave.cc. |
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205 |
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1618
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206 extern "C" void |
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1
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207 jump_to_top_level (void) |
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208 { |
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209 run_all_unwind_protects (); |
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210 |
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211 longjmp (toplevel, 1); |
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212 } |
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213 |
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214 int |
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1755
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215 almost_match (const string& std, const string& s, int min_match_len, |
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526
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216 int case_sens) |
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1
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217 { |
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1755
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218 int stdlen = std.length (); |
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219 int slen = s.length (); |
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1
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220 |
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221 return (slen <= stdlen |
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222 && slen >= min_match_len |
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287
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223 && (case_sens |
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1755
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224 ? (strncmp (std.c_str (), s.c_str (), slen) == 0) |
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225 : (strncasecmp (std.c_str (), s.c_str (), slen) == 0))); |
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287
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226 } |
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227 |
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581
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228 // Ugh. |
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229 |
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287
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230 int |
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1755
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231 keyword_almost_match (const char **std, int *min_len, const string& s, |
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287
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232 int min_toks_to_match, int max_toks) |
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233 { |
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234 int status = 0; |
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235 int tok_count = 0; |
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236 int toks_matched = 0; |
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237 |
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1755
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238 if (s.empty () || max_toks < 1) |
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287
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239 return status; |
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240 |
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1755
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241 char *kw = strsave (s.c_str ()); |
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287
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242 |
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243 char *t = kw; |
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244 while (*t != '\0') |
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245 { |
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246 if (*t == '\t') |
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247 *t = ' '; |
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248 t++; |
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249 } |
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250 |
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251 char *beg = kw; |
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252 while (*beg == ' ') |
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253 beg++; |
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254 |
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255 if (*beg == '\0') |
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256 return status; |
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257 |
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258 |
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259 char **to_match = new char * [max_toks + 1]; |
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526
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260 const char **s1 = std; |
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287
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261 char **s2 = to_match; |
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262 |
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526
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263 if (! s1 || ! s2) |
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287
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264 goto done; |
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265 |
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266 s2[tok_count] = beg; |
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267 char *end; |
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526
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268 while ((end = strchr (beg, ' ')) != 0) |
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287
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269 { |
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270 *end = '\0'; |
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271 beg = end + 1; |
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272 |
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273 while (*beg == ' ') |
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274 beg++; |
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275 |
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276 if (*beg == '\0') |
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277 break; |
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278 |
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279 tok_count++; |
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280 if (tok_count >= max_toks) |
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281 goto done; |
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282 |
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283 s2[tok_count] = beg; |
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284 } |
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526
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285 s2[tok_count+1] = 0; |
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287
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286 |
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287 s2 = to_match; |
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288 |
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289 for (;;) |
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290 { |
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291 if (! almost_match (*s1, *s2, min_len[toks_matched], 0)) |
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292 goto done; |
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293 |
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294 toks_matched++; |
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295 |
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296 s1++; |
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297 s2++; |
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298 |
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299 if (! *s2) |
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300 { |
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301 status = (toks_matched >= min_toks_to_match); |
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302 goto done; |
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303 } |
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304 |
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305 if (! *s1) |
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306 goto done; |
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307 } |
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308 |
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309 done: |
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310 |
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311 delete [] kw; |
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312 delete [] to_match; |
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313 |
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314 return status; |
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1
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315 } |
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316 |
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1755
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317 string_vector |
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338
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318 get_fcn_file_names (int& num, const char *dir, int no_suffix) |
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1
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319 { |
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320 static int num_max = 256; |
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1755
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321 string_vector retval (num_max); |
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1
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322 int i = 0; |
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323 |
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324 DIR *dirp = opendir (dir); |
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526
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325 if (dirp) |
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1
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326 { |
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327 struct dirent *entry; |
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526
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328 while ((entry = readdir (dirp)) != 0) |
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1
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329 { |
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330 int len = NLENGTH (entry); |
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1664
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331 #if defined (WITH_DYNAMIC_LINKING) |
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826
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332 if ((len > 2 |
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333 && entry->d_name[len-2] == '.' |
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334 && entry->d_name[len-1] == 'm') |
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335 || (len > 4 |
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336 && entry->d_name[len-4] == '.' |
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337 && entry->d_name[len-3] == 'o' |
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338 && entry->d_name[len-2] == 'c' |
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339 && entry->d_name[len-1] == 't')) |
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340 #else |
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1
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341 if (len > 2 |
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342 && entry->d_name[len-2] == '.' |
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343 && entry->d_name[len-1] == 'm') |
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826
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344 #endif |
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1
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345 { |
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1755
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346 retval[i] = entry->d_name; |
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1
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347 if (no_suffix) |
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826
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348 { |
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349 if (retval[i][len-1] == 'm') |
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350 retval[i][len-2] = '\0'; |
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351 else |
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352 retval[i][len-4] = '\0'; |
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353 } |
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1
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354 |
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355 i++; |
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356 |
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357 if (i == num_max - 1) |
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358 { |
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359 num_max += 256; |
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1755
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360 retval.resize (num_max); |
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1
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361 } |
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362 } |
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363 } |
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106
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364 closedir (dirp); |
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1
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365 } |
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366 |
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367 num = i; |
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1755
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368 retval.resize (num); |
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1
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369 |
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370 return retval; |
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371 } |
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372 |
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1755
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373 string_vector |
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338
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374 get_fcn_file_names (int& num, int no_suffix) |
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1
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375 { |
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376 static int num_max = 1024; |
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1755
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377 string_vector retval (num_max); |
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1
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378 int i = 0; |
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379 |
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1755
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380 char *path_elt = kpse_path_element (user_pref.loadpath.c_str ()); |
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1
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381 |
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679
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382 while (path_elt) |
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1
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383 { |
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679
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384 str_llist_type *elt_dirs = kpse_element_dirs (path_elt); |
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385 |
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386 str_llist_elt_type *dir; |
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387 for (dir = *elt_dirs; dir; dir = STR_LLIST_NEXT (*dir)) |
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1
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388 { |
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679
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389 char *elt_dir = STR_LLIST (*dir); |
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1
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390 |
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679
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391 if (elt_dir) |
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1
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392 { |
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679
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393 int tmp_num; |
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1755
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394 string_vector names |
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395 = get_fcn_file_names (tmp_num, elt_dir, no_suffix); |
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679
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396 |
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397 if (i + tmp_num >= num_max - 1) |
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398 { |
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399 num_max += 1024; |
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1755
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400 retval.resize (num_max); |
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679
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401 } |
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1
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402 |
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679
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403 int k = 0; |
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404 while (k < tmp_num) |
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405 retval[i++] = names[k++]; |
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406 } |
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407 } |
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1
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408 |
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679
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409 path_elt = kpse_path_element (0); |
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1
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410 } |
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411 |
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412 num = i; |
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1755
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413 retval.resize (num); |
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1
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414 |
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415 return retval; |
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416 } |
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417 |
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1086
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418 // Convert X to the nearest integer value. Should not pass NaN to |
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419 // this function. |
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420 |
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1
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421 int |
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422 NINT (double x) |
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423 { |
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424 if (x > INT_MAX) |
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425 return INT_MAX; |
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426 else if (x < INT_MIN) |
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427 return INT_MIN; |
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428 else |
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429 return (x > 0) ? ((int) (x + 0.5)) : ((int) (x - 0.5)); |
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430 } |
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431 |
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432 double |
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433 D_NINT (double x) |
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434 { |
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435 if (xisinf (x) || xisnan (x)) |
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436 return x; |
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437 else |
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438 return floor (x + 0.5); |
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439 } |
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440 |
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526
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441 // XXX FIXME XXX -- put these in some file, and make them extern. |
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442 |
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443 static int |
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444 all_strings (const Octave_object& args) |
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445 { |
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446 int n = args.length (); |
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712
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447 for (int i = 0; i < n; i++) |
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610
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448 if (! args(i).is_string ()) |
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526
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449 return 0; |
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450 return 1; |
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451 } |
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452 |
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1755
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453 string_vector |
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454 make_argv (const Octave_object& args, const string& fcn_name) |
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526
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455 { |
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1755
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456 string_vector argv; |
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457 |
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526
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458 if (all_strings (args)) |
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459 { |
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460 int n = args.length (); |
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1755
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461 argv.resize (n+1); |
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462 argv[0] = fcn_name; |
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463 |
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712
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464 for (int i = 0; i < n; i++) |
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1755
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465 argv[i+1] = args(i).string_value (); |
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526
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466 } |
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467 else |
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1755
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468 error ("%s: expecting all arguments to be strings", fcn_name.c_str ()); |
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526
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469 |
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470 return argv; |
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471 } |
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472 |
|
719
|
473 // Return non-zero if either NR or NC is zero. Return -1 if this |
|
|
474 // should be considered fatal; return 1 if this is ok. |
|
|
475 |
|
628
|
476 int |
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477 empty_arg (const char *name, int nr, int nc) |
|
|
478 { |
|
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479 int is_empty = 0; |
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480 |
|
|
481 if (nr == 0 || nc == 0) |
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|
482 { |
|
|
483 int flag = user_pref.propagate_empty_matrices; |
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|
484 |
|
|
485 if (flag < 0) |
|
636
|
486 { |
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487 gripe_empty_arg (name, 0); |
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|
488 is_empty = 1; |
|
|
489 } |
|
673
|
490 else if (flag == 0) |
|
636
|
491 { |
|
|
492 gripe_empty_arg (name, 1); |
|
|
493 is_empty = -1; |
|
|
494 } |
|
719
|
495 else |
|
|
496 is_empty = 1; |
|
628
|
497 } |
|
|
498 |
|
|
499 return is_empty; |
|
|
500 } |
|
|
501 |
|
1755
|
502 // Format a list in neat columns. Mostly stolen from GNU ls. |
|
581
|
503 |
|
526
|
504 ostrstream& |
|
1755
|
505 list_in_columns (ostrstream& os, const string_vector& list) |
|
526
|
506 { |
|
1358
|
507 // Compute the maximum name length. |
|
526
|
508 |
|
|
509 int max_name_length = 0; |
|
1755
|
510 int total_names = list.length (); |
|
|
511 |
|
|
512 for (int i = 0; i < total_names; i++) |
|
526
|
513 { |
|
1755
|
514 int name_length = list[i].length (); |
|
526
|
515 if (name_length > max_name_length) |
|
|
516 max_name_length = name_length; |
|
|
517 } |
|
|
518 |
|
1358
|
519 // Allow at least two spaces between names. |
|
526
|
520 |
|
|
521 max_name_length += 2; |
|
|
522 |
|
1358
|
523 // Calculate the maximum number of columns that will fit. |
|
526
|
524 |
|
|
525 int line_length = terminal_columns (); |
|
|
526 int cols = line_length / max_name_length; |
|
|
527 if (cols == 0) |
|
|
528 cols = 1; |
|
|
529 |
|
1358
|
530 // Calculate the number of rows that will be in each column except |
|
|
531 // possibly for a short column on the right. |
|
526
|
532 |
|
|
533 int rows = total_names / cols + (total_names % cols != 0); |
|
|
534 |
|
1358
|
535 // Recalculate columns based on rows. |
|
526
|
536 |
|
|
537 cols = total_names / rows + (total_names % rows != 0); |
|
|
538 |
|
|
539 int count; |
|
|
540 for (int row = 0; row < rows; row++) |
|
|
541 { |
|
|
542 count = row; |
|
|
543 int pos = 0; |
|
|
544 |
|
1358
|
545 // Print the next row. |
|
526
|
546 |
|
|
547 while (1) |
|
|
548 { |
|
1755
|
549 string nm = list[count]; |
|
|
550 |
|
|
551 os << nm; |
|
|
552 int name_length = nm.length (); |
|
526
|
553 |
|
|
554 count += rows; |
|
|
555 if (count >= total_names) |
|
|
556 break; |
|
|
557 |
|
|
558 int spaces_to_pad = max_name_length - name_length; |
|
|
559 for (int i = 0; i < spaces_to_pad; i++) |
|
|
560 os << " "; |
|
|
561 pos += max_name_length; |
|
|
562 } |
|
|
563 os << "\n"; |
|
|
564 } |
|
|
565 |
|
|
566 return os; |
|
|
567 } |
|
|
568 |
|
581
|
569 // See if the given file is in the path. |
|
|
570 |
|
1755
|
571 string |
|
|
572 search_path_for_file (const string& path, const string& name) |
|
686
|
573 { |
|
1755
|
574 string retval; |
|
686
|
575 |
|
1755
|
576 char *tmp = kpse_path_search (path.c_str (), name.c_str (), |
|
|
577 kpathsea_true); |
|
686
|
578 |
|
|
579 if (tmp) |
|
|
580 { |
|
|
581 retval = make_absolute (tmp, the_current_working_directory); |
|
|
582 free (tmp); |
|
|
583 } |
|
|
584 |
|
|
585 return retval; |
|
|
586 } |
|
|
587 |
|
1488
|
588 DEFUN ("file_in_path", Ffile_in_path, Sfile_in_path, 10, |
|
686
|
589 "file_in_path (PATH, NAME)") |
|
|
590 { |
|
|
591 Octave_object retval; |
|
|
592 |
|
1755
|
593 int argc = args.length () + 1; |
|
|
594 |
|
|
595 string_vector argv = make_argv (args, "file_in_path"); |
|
|
596 |
|
|
597 if (error_state) |
|
|
598 return retval; |
|
686
|
599 |
|
|
600 if (argc == 3) |
|
|
601 { |
|
1755
|
602 string fname = search_path_for_file (argv[1], argv[2]); |
|
686
|
603 |
|
1755
|
604 if (fname.empty ()) |
|
|
605 retval = Matrix (); |
|
|
606 else |
|
686
|
607 retval = fname; |
|
|
608 } |
|
|
609 else |
|
|
610 print_usage ("file_in_path"); |
|
|
611 |
|
|
612 return retval; |
|
|
613 } |
|
|
614 |
|
1755
|
615 string |
|
|
616 file_in_path (const string& name, const string& suffix) |
|
526
|
617 { |
|
1755
|
618 string nm = name; |
|
526
|
619 |
|
1755
|
620 if (! suffix.empty ()) |
|
|
621 nm.append (suffix); |
|
686
|
622 |
|
1755
|
623 if (the_current_working_directory.empty ()) |
|
526
|
624 get_working_directory ("file_in_path"); |
|
|
625 |
|
1755
|
626 return search_path_for_file (user_pref.loadpath, nm); |
|
526
|
627 } |
|
|
628 |
|
581
|
629 // See if there is an function file in the path. If so, return the |
|
|
630 // full path to the file. |
|
|
631 |
|
1755
|
632 string |
|
|
633 fcn_file_in_path (const string& name) |
|
526
|
634 { |
|
1755
|
635 string retval; |
|
908
|
636 |
|
1755
|
637 int len = name.length (); |
|
|
638 |
|
|
639 if (len > 0) |
|
|
640 { |
|
|
641 if (len > 2 && name [len - 2] == '.' && name [len - 1] == 'm') |
|
|
642 retval = file_in_path (name, ""); |
|
908
|
643 else |
|
1755
|
644 retval = file_in_path (name, ".m"); |
|
908
|
645 } |
|
1755
|
646 |
|
|
647 return retval; |
|
526
|
648 } |
|
|
649 |
|
581
|
650 // See if there is an octave file in the path. If so, return the |
|
|
651 // full path to the file. |
|
|
652 |
|
1755
|
653 string |
|
|
654 oct_file_in_path (const string& name) |
|
572
|
655 { |
|
1755
|
656 string retval; |
|
908
|
657 |
|
1755
|
658 int len = name.length (); |
|
|
659 |
|
|
660 if (len > 0) |
|
|
661 { |
|
|
662 if (len > 2 && name [len - 4] == '.' && name [len - 3] == 'o' |
|
908
|
663 && name [len - 2] == 'c' && name [len - 1] == 't') |
|
1755
|
664 retval = file_in_path (name, ""); |
|
908
|
665 else |
|
1755
|
666 retval = file_in_path (name, ".oct"); |
|
908
|
667 } |
|
1755
|
668 |
|
|
669 return retval; |
|
572
|
670 } |
|
|
671 |
|
1755
|
672 const char * |
|
801
|
673 undo_string_escape (char c) |
|
|
674 { |
|
|
675 if (! c) |
|
1755
|
676 return ""; |
|
801
|
677 |
|
|
678 switch (c) |
|
|
679 { |
|
|
680 case '\a': |
|
|
681 return "\\a"; |
|
|
682 |
|
|
683 case '\b': // backspace |
|
|
684 return "\\b"; |
|
|
685 |
|
|
686 case '\f': // formfeed |
|
|
687 return "\\f"; |
|
|
688 |
|
|
689 case '\n': // newline |
|
|
690 return "\\n"; |
|
|
691 |
|
|
692 case '\r': // carriage return |
|
|
693 return "\\r"; |
|
|
694 |
|
|
695 case '\t': // horizontal tab |
|
|
696 return "\\t"; |
|
|
697 |
|
|
698 case '\v': // vertical tab |
|
|
699 return "\\v"; |
|
|
700 |
|
|
701 case '\\': // backslash |
|
|
702 return "\\\\"; |
|
|
703 |
|
|
704 case '"': // double quote |
|
|
705 return "\\\""; |
|
|
706 |
|
|
707 default: |
|
1755
|
708 { |
|
|
709 static char retval[2]; |
|
|
710 retval[0] = c; |
|
|
711 retval[1] = '\0'; |
|
|
712 return retval; |
|
|
713 } |
|
801
|
714 } |
|
|
715 } |
|
|
716 |
|
1755
|
717 string |
|
|
718 undo_string_escapes (const string& s) |
|
801
|
719 { |
|
1755
|
720 string retval; |
|
801
|
721 |
|
1755
|
722 for (size_t i = 0; i < s.length (); i++) |
|
|
723 retval.append (undo_string_escape (s[i])); |
|
801
|
724 |
|
1755
|
725 return retval; |
|
801
|
726 } |
|
|
727 |
|
|
728 DEFUN ("undo_string_escapes", Fundo_string_escapes, |
|
1488
|
729 Sundo_string_escapes, 10, |
|
801
|
730 "undo_string_escapes (STRING)") |
|
|
731 { |
|
|
732 tree_constant retval; |
|
|
733 |
|
|
734 int nargin = args.length (); |
|
|
735 |
|
|
736 if (nargin == 1 && args(0).is_string ()) |
|
1755
|
737 retval = undo_string_escapes (args(0).string_value ()); |
|
801
|
738 else |
|
1023
|
739 print_usage ("undo_string_escapes"); |
|
801
|
740 |
|
|
741 return retval; |
|
|
742 } |
|
|
743 |
|
1711
|
744 // This function was adapted from xputenv from Karl Berry's kpathsearch |
|
|
745 // library. |
|
|
746 |
|
|
747 void |
|
|
748 oct_putenv (const char *var_name, const char *value) |
|
|
749 { |
|
|
750 static const char **saved_env_items = 0; |
|
|
751 static unsigned saved_len; |
|
|
752 char *old_item = 0; |
|
|
753 |
|
|
754 int new_len = strlen (var_name) + strlen (value) + 2; |
|
|
755 |
|
|
756 char *new_item = new char [new_len]; |
|
|
757 |
|
|
758 sprintf (new_item, "%s=%s", var_name, value); |
|
|
759 |
|
|
760 #ifndef SMART_PUTENV |
|
|
761 |
|
|
762 // Check if we have saved anything yet. |
|
|
763 |
|
|
764 if (! saved_env_items) |
|
|
765 { |
|
|
766 saved_env_items = new const char * [1]; |
|
|
767 saved_env_items[0] = var_name; |
|
|
768 saved_len = 1; |
|
|
769 } |
|
|
770 else |
|
|
771 { |
|
|
772 // Check if we've assigned VAR_NAME before. |
|
|
773 |
|
|
774 unsigned len = strlen (var_name); |
|
|
775 |
|
|
776 for (unsigned i = 0; i < saved_len && ! old_item; i++) |
|
|
777 { |
|
|
778 if (strcmp (saved_env_items[i], var_name) == 0) |
|
|
779 { |
|
|
780 old_item = getenv (var_name); |
|
|
781 |
|
|
782 assert (old_item); |
|
|
783 |
|
|
784 // Back up to the `NAME=' in the environment before the |
|
|
785 // value that getenv returns. |
|
|
786 |
|
|
787 old_item -= (len + 1); |
|
|
788 } |
|
|
789 } |
|
|
790 |
|
|
791 if (! old_item) |
|
|
792 { |
|
|
793 // If we haven't seen VAR_NAME before, save it. Assume it |
|
|
794 // is in safe storage. |
|
|
795 |
|
|
796 saved_len++; |
|
|
797 |
|
|
798 const char **tmp = new const char * [saved_len]; |
|
|
799 |
|
|
800 for (unsigned i = 0; i < saved_len - 1; i++) |
|
|
801 tmp[i] = saved_env_items[i]; |
|
|
802 |
|
|
803 tmp[saved_len - 1] = var_name; |
|
|
804 |
|
|
805 delete [] saved_env_items; |
|
|
806 |
|
|
807 saved_env_items = tmp; |
|
|
808 } |
|
|
809 } |
|
|
810 |
|
|
811 #endif |
|
|
812 |
|
|
813 // As far as I can see there's no way to distinguish between the |
|
|
814 // various errors; putenv doesn't have errno values. |
|
|
815 |
|
|
816 if (putenv (new_item) < 0) |
|
|
817 error ("putenv (%s) failed", new_item); |
|
|
818 |
|
|
819 #ifndef SMART_PUTENV |
|
|
820 |
|
|
821 // Can't free `new_item' because its contained value is now in |
|
|
822 // `environ', but we can free `old_item', since it's been replaced. |
|
|
823 |
|
|
824 delete [] old_item; |
|
|
825 |
|
|
826 #endif |
|
|
827 } |
|
|
828 |
|
572
|
829 /* |
|
1
|
830 ;;; Local Variables: *** |
|
|
831 ;;; mode: C++ *** |
|
|
832 ;;; page-delimiter: "^/\\*" *** |
|
|
833 ;;; End: *** |
|
|
834 */ |
