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< title > Directories< / title >
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< h2 > Foundation< / h2 >
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<!-- Weave of 'Directories' generated by 7 -->
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< ul class = "crumbs" > < li > < a href = "../webs.html" > Source< / a > < / li > < li > < a href = "index.html" > foundation< / a > < / li > < li > < a href = "index.html#3" > Chapter 3: The Operating System< / a > < / li > < li > < b > Directories< / b > < / li > < / ul > < p class = "purpose" > Scanning directories on the host filing system.< / p >
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< p class = "inwebparagraph" > < a id = "SP1" > < / a > < b > § 1. < / b > All of this abstracts the code already found in the platform definitions.
< / p >
< pre class = "display" >
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< span class = "reserved" > typedef< / span > < span class = "plain" > < / span > < span class = "reserved" > struct< / span > < span class = "plain" > < / span > < span class = "reserved" > scan_directory< / span > < span class = "plain" > {< / span >
< span class = "reserved" > void< / span > < span class = "plain" > *< / span > < span class = "identifier" > directory_handle< / span > < span class = "plain" > ;< / span >
< span class = "reserved" > char< / span > < span class = "plain" > < / span > < span class = "identifier" > directory_name_written_out< / span > < span class = "plain" > [4*< / span > < span class = "constant" > MAX_FILENAME_LENGTH< / span > < span class = "plain" > ];< / span >
< span class = "constant" > MEMORY_MANAGEMENT< / span >
< span class = "plain" > } < / span > < span class = "reserved" > scan_directory< / span > < span class = "plain" > ;< / span >
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< / pre >
< p class = "inwebparagraph" > < / p >
< p class = "endnote" > The structure scan_directory is private to this section.< / p >
< p class = "inwebparagraph" > < a id = "SP2" > < / a > < b > § 2. < / b > The directory name going out has to be transcoded from flat Unicode to
whatever the locale encoding is; the filenames coming back have to be
transcoded the other way.
< / p >
< pre class = "display" >
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< span class = "reserved" > scan_directory< / span > < span class = "plain" > *< / span > < span class = "functiontext" > Directories::open< / span > < span class = "plain" > (< / span > < span class = "reserved" > pathname< / span > < span class = "plain" > *< / span > < span class = "identifier" > P< / span > < span class = "plain" > ) {< / span >
< span class = "reserved" > scan_directory< / span > < span class = "plain" > *< / span > < span class = "identifier" > D< / span > < span class = "plain" > = < / span > < span class = "identifier" > CREATE< / span > < span class = "plain" > (< / span > < span class = "reserved" > scan_directory< / span > < span class = "plain" > );< / span >
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< span class = "identifier" > TEMPORARY_TEXT< / span > < span class = "plain" > (< / span > < span class = "identifier" > pn< / span > < span class = "plain" > );< / span >
< span class = "identifier" > WRITE_TO< / span > < span class = "plain" > (< / span > < span class = "identifier" > pn< / span > < span class = "plain" > , < / span > < span class = "string" > "%p"< / span > < span class = "plain" > , < / span > < span class = "identifier" > P< / span > < span class = "plain" > );< / span >
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< span class = "functiontext" > Str::copy_to_locale_string< / span > < span class = "plain" > (< / span > < span class = "identifier" > D< / span > < span class = "plain" > -> < / span > < span class = "element" > directory_name_written_out< / span > < span class = "plain" > , < / span > < span class = "identifier" > pn< / span > < span class = "plain" > , < / span > < span class = "constant" > 4< / span > < span class = "plain" > *< / span > < span class = "constant" > MAX_FILENAME_LENGTH< / span > < span class = "plain" > );< / span >
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< span class = "identifier" > DISCARD_TEXT< / span > < span class = "plain" > (< / span > < span class = "identifier" > pn< / span > < span class = "plain" > );< / span >
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< span class = "identifier" > D< / span > < span class = "plain" > -> < / span > < span class = "element" > directory_handle< / span > < span class = "plain" > = < / span > < span class = "functiontext" > Platform::opendir< / span > < span class = "plain" > (< / span > < span class = "identifier" > D< / span > < span class = "plain" > -> < / span > < span class = "element" > directory_name_written_out< / span > < span class = "plain" > );< / span >
< span class = "reserved" > if< / span > < span class = "plain" > (< / span > < span class = "identifier" > D< / span > < span class = "plain" > -> < / span > < span class = "element" > directory_handle< / span > < span class = "plain" > == < / span > < span class = "identifier" > NULL< / span > < span class = "plain" > ) < / span > < span class = "reserved" > return< / span > < span class = "plain" > < / span > < span class = "identifier" > NULL< / span > < span class = "plain" > ;< / span >
< span class = "reserved" > return< / span > < span class = "plain" > < / span > < span class = "identifier" > D< / span > < span class = "plain" > ;< / span >
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< span class = "plain" > }< / span >
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< span class = "reserved" > int< / span > < span class = "plain" > < / span > < span class = "functiontext" > Directories::next< / span > < span class = "plain" > (< / span > < span class = "reserved" > scan_directory< / span > < span class = "plain" > *< / span > < span class = "identifier" > D< / span > < span class = "plain" > , < / span > < span class = "reserved" > text_stream< / span > < span class = "plain" > *< / span > < span class = "identifier" > leafname< / span > < span class = "plain" > ) {< / span >
< span class = "reserved" > char< / span > < span class = "plain" > < / span > < span class = "identifier" > leafname_Cs< / span > < span class = "plain" > [< / span > < span class = "constant" > MAX_FILENAME_LENGTH< / span > < span class = "plain" > ];< / span >
< span class = "reserved" > int< / span > < span class = "plain" > < / span > < span class = "identifier" > rv< / span > < span class = "plain" > = < / span > < span class = "constant" > TRUE< / span > < span class = "plain" > ;< / span >
< span class = "reserved" > while< / span > < span class = "plain" > (< / span > < span class = "identifier" > rv< / span > < span class = "plain" > ) {< / span >
< span class = "identifier" > rv< / span > < span class = "plain" > = < / span > < span class = "functiontext" > Platform::readdir< / span > < span class = "plain" > (< / span > < span class = "identifier" > D< / span > < span class = "plain" > -> < / span > < span class = "element" > directory_handle< / span > < span class = "plain" > , < / span > < span class = "identifier" > D< / span > < span class = "plain" > -> < / span > < span class = "element" > directory_name_written_out< / span > < span class = "plain" > , < / span > < span class = "identifier" > leafname_Cs< / span > < span class = "plain" > );< / span >
< span class = "reserved" > if< / span > < span class = "plain" > (< / span > < span class = "identifier" > leafname_Cs< / span > < span class = "plain" > [0] != < / span > < span class = "character" > '.'< / span > < span class = "plain" > ) < / span > < span class = "reserved" > break< / span > < span class = "plain" > ;< / span >
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< span class = "plain" > }< / span >
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< span class = "functiontext" > Str::clear< / span > < span class = "plain" > (< / span > < span class = "identifier" > leafname< / span > < span class = "plain" > );< / span >
< span class = "reserved" > if< / span > < span class = "plain" > (< / span > < span class = "identifier" > rv< / span > < span class = "plain" > ) < / span > < span class = "functiontext" > Streams::write_locale_string< / span > < span class = "plain" > (< / span > < span class = "identifier" > leafname< / span > < span class = "plain" > , < / span > < span class = "identifier" > leafname_Cs< / span > < span class = "plain" > );< / span >
< span class = "reserved" > return< / span > < span class = "plain" > < / span > < span class = "identifier" > rv< / span > < span class = "plain" > ;< / span >
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< span class = "plain" > }< / span >
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< span class = "reserved" > void< / span > < span class = "plain" > < / span > < span class = "functiontext" > Directories::close< / span > < span class = "plain" > (< / span > < span class = "reserved" > scan_directory< / span > < span class = "plain" > *< / span > < span class = "identifier" > D< / span > < span class = "plain" > ) {< / span >
< span class = "functiontext" > Platform::closedir< / span > < span class = "plain" > (< / span > < span class = "identifier" > D< / span > < span class = "plain" > -> < / span > < span class = "element" > directory_handle< / span > < span class = "plain" > );< / span >
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< span class = "plain" > }< / span >
< / pre >
< p class = "inwebparagraph" > < / p >
< p class = "endnote" > The function Directories::open appears nowhere else.< / p >
< p class = "endnote" > The function Directories::next appears nowhere else.< / p >
< p class = "endnote" > The function Directories::close appears nowhere else.< / p >
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< hr class = "tocbar" >
< ul class = "toc" > < li > < a href = "3-shl.html" > Back to 'Shell'< / a > < / li > < li > < a href = "3-tm.html" > Continue with 'Time'< / a > < / li > < / ul > < hr class = "tocbar" >
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