1 | module m_buffer |
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2 | |
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3 | ! |
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4 | ! At this point we use a fixed-size buffer. |
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5 | ! Note however that buffer overflows will only be |
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6 | ! triggered by overly long *unbroken* pcdata values, or |
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7 | ! by overly long attribute values. Hopefully |
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8 | ! element or attribute names are "short enough". |
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9 | ! There is code in m_fsm to avoid buffer overflows |
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10 | ! caused by pcdata with whitespace. |
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11 | ! |
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12 | ! In a forthcoming implementation it could be made dynamical... |
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13 | ! |
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14 | integer, parameter, public :: MAX_BUFF_SIZE = 10000 |
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15 | integer, parameter, private :: BUFF_SIZE_WARNING = 900 |
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16 | |
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17 | ! |
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18 | |
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19 | type, public :: buffer_t |
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20 | private |
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21 | integer :: size |
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22 | character(len=MAX_BUFF_SIZE) :: str |
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23 | end type buffer_t |
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24 | |
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25 | public :: add_to_buffer |
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26 | public :: print_buffer, str, len !! , char |
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27 | public :: operator (.equal.) |
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28 | public :: buffer_nearly_full, reset_buffer, init_buffer |
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29 | public :: buffer_to_character |
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30 | |
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31 | |
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32 | !---------------------------------------------------------------- |
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33 | interface add_to_buffer |
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34 | module procedure add_str_to_buffer |
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35 | end interface |
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36 | private :: add_char_to_buffer, add_str_to_buffer |
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37 | |
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38 | interface operator (.equal.) |
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39 | module procedure compare_buffers, compare_buffer_str, & |
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40 | compare_str_buffer |
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41 | end interface |
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42 | private :: compare_buffers, compare_buffer_str, compare_str_buffer |
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43 | |
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44 | interface str |
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45 | module procedure buffer_to_str |
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46 | end interface |
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47 | interface char ! Experimental |
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48 | module procedure buffer_to_str |
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49 | end interface |
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50 | private :: buffer_to_str |
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51 | |
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52 | interface len |
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53 | module procedure buffer_length |
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54 | end interface |
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55 | private :: buffer_length |
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56 | |
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57 | CONTAINS |
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58 | !================================================================== |
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59 | |
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60 | !---------------------------------------------------------------- |
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61 | function compare_buffers(a,b) result(equal) ! .equal. generic |
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62 | type(buffer_t), intent(in) :: a |
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63 | type(buffer_t), intent(in) :: b |
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64 | logical :: equal |
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65 | |
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66 | equal = ((a%size == b%size) .and. (a%str(1:a%size) == b%str(1:b%size))) |
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67 | |
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68 | end function compare_buffers |
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69 | |
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70 | !---------------------------------------------------------------- |
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71 | function compare_buffer_str(buffer,str) result(equal) ! .equal. generic |
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72 | type(buffer_t), intent(in) :: buffer |
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73 | character(len=*), intent(in) :: str |
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74 | logical :: equal |
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75 | |
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76 | equal = (buffer%str(1:buffer%size) == trim(str)) |
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77 | |
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78 | end function compare_buffer_str |
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79 | |
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80 | !---------------------------------------------------------------- |
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81 | function compare_str_buffer(str,buffer) result(equal) ! .equal. generic |
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82 | character(len=*), intent(in) :: str |
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83 | type(buffer_t), intent(in) :: buffer |
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84 | logical :: equal |
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85 | |
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86 | equal = (buffer%str(1:buffer%size) == trim(str)) |
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87 | |
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88 | end function compare_str_buffer |
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89 | |
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90 | !---------------------------------------------------------------- |
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91 | subroutine add_char_to_buffer(c,buffer) |
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92 | character(len=1), intent(in) :: c |
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93 | type(buffer_t), intent(inout) :: buffer |
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94 | |
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95 | integer :: n |
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96 | buffer%size = buffer%size + 1 |
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97 | n = buffer%size |
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98 | |
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99 | if (n> MAX_BUFF_SIZE) then |
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100 | !! RETURN |
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101 | ! |
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102 | ! It will only affect long comments and sgml declarations |
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103 | STOP "sax 1 Buffer overflow: long unbroken string of pcdata or attribute value..." |
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104 | endif |
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105 | |
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106 | buffer%str(n:n) = c |
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107 | end subroutine add_char_to_buffer |
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108 | |
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109 | !---------------------------------------------------------------- |
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110 | subroutine add_str_to_buffer(s,buffer) |
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111 | character(len=*), intent(in) :: s |
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112 | type(buffer_t), intent(inout) :: buffer |
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113 | |
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114 | integer :: n, len_s, last_pos |
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115 | |
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116 | len_s = len(s) |
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117 | last_pos = buffer%size |
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118 | buffer%size = buffer%size + len_s |
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119 | n = buffer%size |
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120 | |
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121 | if (n> MAX_BUFF_SIZE) then |
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122 | !! RETURN |
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123 | ! |
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124 | ! It will only affect long comments and sgml declarations |
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125 | STOP "sax 2 Buffer overflow: long unbroken string of pcdata or attribute value..." |
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126 | endif |
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127 | |
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128 | buffer%str(last_pos+1:n) = s |
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129 | end subroutine add_str_to_buffer |
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130 | |
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131 | !---------------------------------------------------------------- |
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132 | subroutine init_buffer(buffer) |
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133 | type(buffer_t), intent(inout) :: buffer |
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134 | |
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135 | buffer%size = 0 |
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136 | buffer%str="" ! To avoid "undefined" status |
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137 | |
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138 | end subroutine init_buffer |
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139 | !---------------------------------------------------------------- |
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140 | subroutine reset_buffer(buffer) |
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141 | type(buffer_t), intent(inout) :: buffer |
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142 | buffer%size = 0 |
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143 | end subroutine reset_buffer |
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144 | !---------------------------------------------------------------- |
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145 | subroutine print_buffer(buffer) |
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146 | type(buffer_t), intent(in) :: buffer |
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147 | |
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148 | integer :: i |
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149 | |
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150 | do i = 1, buffer%size |
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151 | write(unit=6,fmt="(a1)",advance="no") buffer%str(i:i) |
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152 | enddo |
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153 | |
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154 | end subroutine print_buffer |
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155 | !---------------------------------------------------------------- |
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156 | ! This is better... but could it lead to memory leaks? |
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157 | ! |
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158 | function buffer_to_str(buffer) result(str) |
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159 | type(buffer_t), intent(in) :: buffer |
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160 | character(len=buffer%size) :: str |
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161 | |
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162 | str = buffer%str(1:buffer%size) |
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163 | end function buffer_to_str |
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164 | |
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165 | !---------------------------------------------------------------- |
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166 | ! |
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167 | subroutine buffer_to_character(buffer,str) |
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168 | type(buffer_t), intent(in) :: buffer |
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169 | character(len=*), intent(out) :: str |
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170 | |
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171 | str = buffer%str(1:buffer%size) |
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172 | end subroutine buffer_to_character |
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173 | |
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174 | !---------------------------------------------------------------- |
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175 | function buffer_nearly_full(buffer) result(warn) |
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176 | type(buffer_t), intent(in) :: buffer |
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177 | logical :: warn |
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178 | |
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179 | warn = buffer%size > BUFF_SIZE_WARNING |
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180 | |
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181 | end function buffer_nearly_full |
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182 | |
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183 | !---------------------------------------------------------------- |
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184 | function buffer_length(buffer) result(length) |
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185 | type(buffer_t), intent(in) :: buffer |
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186 | integer :: length |
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187 | |
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188 | length = buffer%size |
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189 | |
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190 | end function buffer_length |
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191 | |
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192 | |
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193 | end module m_buffer |
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194 | |
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195 | |
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196 | |
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197 | |
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198 | |
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199 | |
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200 | |
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