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1993
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1 // utils.cc |
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1967
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2 /* |
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3 |
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4 Copyright (C) 1996, 1997 John W. Eaton |
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1967
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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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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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24 #ifdef HAVE_CONFIG_H |
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25 #include <config.h> |
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26 #endif |
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27 |
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28 #include <climits> |
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29 #include <cstdlib> |
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30 #include <cstdio> |
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31 |
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32 #include <string> |
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33 |
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34 #ifdef HAVE_UNISTD_H |
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35 #ifdef HAVE_SYS_TYPES_H |
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36 #include <sys/types.h> |
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37 #endif |
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38 #include <unistd.h> |
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39 #endif |
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40 |
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41 #include "lo-error.h" |
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42 #include "lo-mappers.h" |
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43 #include "lo-utils.h" |
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44 |
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45 // Convert X to the nearest integer value. Should not pass NaN to |
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46 // this function. |
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47 |
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48 int |
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49 NINT (double x) |
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50 { |
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51 if (x > INT_MAX) |
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52 return INT_MAX; |
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53 else if (x < INT_MIN) |
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54 return INT_MIN; |
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55 else |
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56 return (x > 0) ? ((int) (x + 0.5)) : ((int) (x - 0.5)); |
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57 } |
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58 |
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59 double |
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60 D_NINT (double x) |
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61 { |
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62 if (xisinf (x) || xisnan (x)) |
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63 return x; |
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64 else |
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65 return floor (x + 0.5); |
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66 } |
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67 |
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68 // Save a string. |
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69 |
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70 char * |
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71 strsave (const char *s) |
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72 { |
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73 if (! s) |
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74 return 0; |
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75 |
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76 int len = strlen (s); |
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77 char *tmp = new char [len+1]; |
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78 tmp = strcpy (tmp, s); |
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79 return tmp; |
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80 } |
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81 |
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82 // This function was adapted from xputenv from Karl Berry's kpathsearch |
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83 // library. |
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84 |
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85 // XXX FIXME XXX -- make this do the right thing if we don't have a |
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86 // SMART_PUTENV. |
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87 |
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88 void |
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89 octave_putenv (const string& name, const string& value) |
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90 { |
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91 int new_len = name.length () + value.length () + 2; |
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92 |
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93 char *new_item = static_cast<char*> (malloc (new_len)); |
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94 |
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95 sprintf (new_item, "%s=%s", name.c_str (), value.c_str ()); |
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96 |
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97 // As far as I can see there's no way to distinguish between the |
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98 // various errors; putenv doesn't have errno values. |
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99 |
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100 if (putenv (new_item) < 0) |
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101 (*current_liboctave_error_handler) ("putenv (%s) failed", new_item); |
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102 } |
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103 |
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104 string |
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105 octave_fgets (FILE *f) |
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106 { |
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107 string retval; |
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108 |
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109 int grow_size = 1024; |
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110 int max_size = grow_size; |
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111 |
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112 char *buf = static_cast<char *> (malloc (max_size)); |
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113 char *bufptr = buf; |
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114 int len = 0; |
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115 |
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116 do |
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117 { |
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118 if (fgets (bufptr, grow_size, f)) |
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119 { |
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120 len = strlen (bufptr); |
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121 |
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122 if (len == grow_size - 1) |
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123 { |
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124 int tmp = bufptr - buf + grow_size - 1; |
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125 grow_size *= 2; |
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126 max_size += grow_size; |
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127 buf = static_cast<char *> (realloc (buf, max_size)); |
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128 bufptr = buf + tmp; |
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129 |
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130 if (*(bufptr-1) == '\n') |
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131 { |
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132 *bufptr = '\0'; |
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133 retval = buf; |
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134 } |
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135 } |
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136 else if (bufptr[len-1] != '\n') |
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137 { |
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138 bufptr[len++] = '\n'; |
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139 bufptr[len] = '\0'; |
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140 retval = buf; |
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141 } |
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142 else |
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143 retval = buf; |
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144 } |
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145 else |
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146 { |
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147 if (len == 0) |
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148 { |
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149 free (buf); |
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150 |
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151 buf = 0; |
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152 } |
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153 |
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154 break; |
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155 } |
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156 } |
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157 while (retval.empty ()); |
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158 |
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159 if (buf) |
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160 free (buf); |
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161 |
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162 return retval; |
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163 } |
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164 |
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165 /* |
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166 ;;; Local Variables: *** |
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167 ;;; mode: C++ *** |
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168 ;;; End: *** |
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169 */ |
