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1 /* |
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2 |
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3 Copyright (C) 2000 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #if defined (__GNUG__) |
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24 #pragma implementation |
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25 #endif |
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26 |
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27 #ifdef HAVE_CONFIG_H |
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28 #include <config.h> |
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29 #endif |
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30 |
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31 #include "c-file-ptr-stream.h" |
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32 |
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33 #ifndef SEEK_SET |
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34 #define SEEK_SET 0 |
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35 #endif |
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36 |
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37 #ifndef SEEK_CUR |
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38 #define SEEK_CUR 1 |
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39 #endif |
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40 |
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41 #ifndef SEEK_END |
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42 #define SEEK_END 2 |
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43 #endif |
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44 |
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45 c_file_ptr_buf::~c_file_ptr_buf (void) |
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46 { |
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47 if (f) |
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48 fflush (f); |
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49 } |
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50 |
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51 // XXX FIXME XXX -- I'm sure there is room for improvement here... |
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52 |
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53 int |
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54 c_file_ptr_buf::overflow (int c) |
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55 { |
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56 if (f) |
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57 return (c != EOF) ? fputc (c, f) : fflush (f); |
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58 else |
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59 return EOF; |
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60 } |
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61 |
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62 int |
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63 c_file_ptr_buf::underflow (void) |
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64 { |
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65 if (f) |
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66 return fgetc (f); |
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67 else |
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68 return EOF; |
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69 } |
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70 |
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71 int |
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72 c_file_ptr_buf::uflow (void) |
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73 { |
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74 return underflow (); |
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75 } |
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76 |
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77 int |
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78 c_file_ptr_buf::pbackfail (int c) |
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79 { |
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80 return (c != EOF && f) ? ungetc (c, f) : EOF; |
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81 } |
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82 |
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83 std::streamsize |
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84 c_file_ptr_buf::xsputn (const char* s, std::streamsize n) |
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85 { |
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86 if (f) |
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87 return fwrite (s, 1, n, f); |
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88 else |
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89 return 0; |
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90 } |
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91 |
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92 std::streamsize |
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93 c_file_ptr_buf::xsgetn (char *s, std::streamsize n) |
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94 { |
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95 if (f) |
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96 return fread (s, 1, n, f); |
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97 else |
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98 return 0; |
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99 } |
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100 |
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101 static inline int |
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102 seekdir_to_whence (std::ios::seekdir dir) |
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103 { |
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104 return ((dir == std::ios::beg) ? SEEK_SET : |
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105 (dir == std::ios::cur) ? SEEK_CUR : |
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106 (dir == std::ios::end) ? SEEK_END : |
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107 dir); |
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108 } |
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109 |
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110 std::streampos |
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111 c_file_ptr_buf::seekoff (std::streamoff offset, std::ios::seekdir dir, |
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112 std::ios::openmode) |
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113 { |
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114 // XXX FIXME XXX -- is this the right thing to do? |
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115 |
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116 if (f) |
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117 { |
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118 fseek (f, offset, seekdir_to_whence (dir)); |
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119 |
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120 return ftell (f); |
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121 } |
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122 else |
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123 return 0; |
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124 } |
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125 |
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126 std::streampos |
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127 c_file_ptr_buf::seekpos (std::streampos offset, std::ios::openmode) |
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128 { |
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129 // XXX FIXME XXX -- is this the right thing to do? |
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130 |
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131 if (f) |
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132 { |
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133 fseek (f, offset, SEEK_SET); |
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134 |
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135 return ftell (f); |
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136 } |
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137 else |
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138 return 0; |
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139 } |
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140 |
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141 int |
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142 c_file_ptr_buf::sync (void) |
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143 { |
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144 return 0; |
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145 } |
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146 |
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147 /* |
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148 ;;; Local Variables: *** |
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149 ;;; mode: C++ *** |
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150 ;;; End: *** |
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151 */ |
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152 |
