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<!-- Weave of 'Shell' generated by Inweb -->
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< ul class = "crumbs" > < li > < a href = "../index.html" > Home< / 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 > Shell< / b > < / li > < / ul > < / div >
< p class = "purpose" > Sending commands to the shell, on Unix-like platforms, or simulating this on Windows.< / p >
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< ul class = "toc" > < li > < a href = "3-shl.html#SP1" > § 1. Operating system interface< / a > < / li > < li > < a href = "3-shl.html#SP5" > § 5. Actual commands< / a > < / li > < / ul > < hr class = "tocbar" >
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< p class = "commentary firstcommentary" > < a id = "SP1" > < / a > < b > § 1. Operating system interface. < / b > Some of our programs have to issue commands to the host operating system,
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to copy files, pass them through TeX, and so on. All of that is done using
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the C standard library < span class = "extract" > < span class = "extract-syntax" > system< / span > < / span > function; the commands invoked are all
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standard for POSIX, so will work on MacOS and Linux, but on a Windows system
they would need to be read in a POSIX-style environment like Cygwin.
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Shell::quote_path< / span > < button class = "popup" onclick = "togglePopup('usagePopup1')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup1" > Usage of < span class = "code-font" > < span class = "function-syntax" > Shell::quote_path< / span > < / span > :< br / > < a href = "3-shl.html#SP3" > § 3< / a > < br / > Epub Ebooks - < a href = "5-ee.html#SP7_4_1" > § 7.4.1< / a > , < a href = "5-ee.html#SP7_4_2" > § 7.4.2< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "constant-syntax" > OUTPUT_STREAM< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > pathname< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TEMPORARY_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > FN< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > FN< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "%p"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "3-shl.html#SP1" class = "function-link" > < span class = "function-syntax" > Shell::quote_text< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > OUT< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > FN< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > DISCARD_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > FN< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Shell::quote_file< / span > < button class = "popup" onclick = "togglePopup('usagePopup2')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup2" > Usage of < span class = "code-font" > < span class = "function-syntax" > Shell::quote_file< / span > < / span > :< br / > < a href = "3-shl.html#SP2" > § 2< / a > , < a href = "3-shl.html#SP3" > § 3< / a > , < a href = "3-shl.html#SP4" > § 4< / a > < br / > Epub Ebooks - < a href = "5-ee.html#SP7_4_1" > § 7.4.1< / a > , < a href = "5-ee.html#SP7_4_2" > § 7.4.2< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "constant-syntax" > OUTPUT_STREAM< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > filename< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > F< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TEMPORARY_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > FN< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > FN< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "%f"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > F< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "3-shl.html#SP1" class = "function-link" > < span class = "function-syntax" > Shell::quote_text< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > OUT< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > FN< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > DISCARD_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > FN< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Shell::plain< / span > < button class = "popup" onclick = "togglePopup('usagePopup3')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup3" > Usage of < span class = "code-font" > < span class = "function-syntax" > Shell::plain< / span > < / span > :< br / > < a href = "3-shl.html#SP2" > § 2< / a > , < a href = "3-shl.html#SP3" > § 3< / a > , < a href = "3-shl.html#SP4" > § 4< / a > < br / > Epub Ebooks - < a href = "5-ee.html#SP7_4_1" > § 7.4.1< / a > , < a href = "5-ee.html#SP7_4_2" > § 7.4.2< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "constant-syntax" > OUTPUT_STREAM< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > raw< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "%s"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > raw< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Shell::plain_text< / span > < button class = "popup" onclick = "togglePopup('usagePopup4')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup4" > Usage of < span class = "code-font" > < span class = "function-syntax" > Shell::plain_text< / span > < / span > :< br / > < a href = "3-shl.html#SP2" > § 2< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "constant-syntax" > OUTPUT_STREAM< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > raw< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "%S"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > raw< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Shell::quote_text< / span > < span class = "plain-syntax" > (< / span > < span class = "constant-syntax" > OUTPUT_STREAM< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > raw< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > PUT< / span > < span class = "plain-syntax" > (< / span > < span class = "constant-syntax" > SHELL_QUOTE_CHARACTER< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_THROUGH_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > raw< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > wchar_t< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > c< / span > < span class = "plain-syntax" > = < / span > < a href = "4-sm.html#SP13" class = "function-link" > < span class = "function-syntax" > Str::get< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > c< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > SHELL_QUOTE_CHARACTER< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > PUT< / span > < span class = "plain-syntax" > (< / span > < span class = "character-syntax" > '\\'< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > PUT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > c< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > PUT< / span > < span class = "plain-syntax" > (< / span > < span class = "constant-syntax" > SHELL_QUOTE_CHARACTER< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > PUT< / span > < span class = "plain-syntax" > (< / span > < span class = "character-syntax" > ' '< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP2" > < / a > < b > § 2. < / b > The generic shell code to apply < span class = "extract" > < span class = "extract-syntax" > command< / span > < / span > to a file < span class = "extract" > < span class = "extract-syntax" > F< / span > < / span > :
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Shell::apply< / span > < button class = "popup" onclick = "togglePopup('usagePopup5')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup5" > Usage of < span class = "code-font" > < span class = "function-syntax" > Shell::apply< / span > < / span > :< br / > < a href = "3-shl.html#SP3" > § 3< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > command< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > filename< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > F< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TEMPORARY_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > COMMAND< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < a href = "3-shl.html#SP1" class = "function-link" > < span class = "function-syntax" > Shell::plain< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > COMMAND< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > command< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "3-shl.html#SP1" class = "function-link" > < span class = "function-syntax" > Shell::plain< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > COMMAND< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > " "< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "3-shl.html#SP1" class = "function-link" > < span class = "function-syntax" > Shell::quote_file< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > COMMAND< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > F< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "3-shl.html#SP5" class = "function-link" > < span class = "function-syntax" > Shell::run< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > COMMAND< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > DISCARD_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > COMMAND< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Shell::apply_S< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > command< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > filename< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > F< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TEMPORARY_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > COMMAND< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < a href = "3-shl.html#SP1" class = "function-link" > < span class = "function-syntax" > Shell::plain_text< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > COMMAND< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > command< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "3-shl.html#SP1" class = "function-link" > < span class = "function-syntax" > Shell::plain< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > COMMAND< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > " "< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "3-shl.html#SP1" class = "function-link" > < span class = "function-syntax" > Shell::quote_file< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > COMMAND< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > F< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "3-shl.html#SP5" class = "function-link" > < span class = "function-syntax" > Shell::run< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > COMMAND< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > DISCARD_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > COMMAND< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP3" > < / a > < b > § 3. < / b > Applications to using < span class = "extract" > < span class = "extract-syntax" > rm< / span > < / span > and < span class = "extract" > < span class = "extract-syntax" > cp< / span > < / span > :
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Shell::rm< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > filename< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > F< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < a href = "3-shl.html#SP2" class = "function-link" > < span class = "function-syntax" > Shell::apply< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "rm"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > F< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Shell::copy< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > filename< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > F< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > pathname< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > T< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > options< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TEMPORARY_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > COMMAND< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < a href = "3-shl.html#SP1" class = "function-link" > < span class = "function-syntax" > Shell::plain< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > COMMAND< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "cp "< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "3-shl.html#SP1" class = "function-link" > < span class = "function-syntax" > Shell::plain< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > COMMAND< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > options< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "3-shl.html#SP1" class = "function-link" > < span class = "function-syntax" > Shell::plain< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > COMMAND< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > " "< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "3-shl.html#SP1" class = "function-link" > < span class = "function-syntax" > Shell::quote_file< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > COMMAND< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > F< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "3-shl.html#SP1" class = "function-link" > < span class = "function-syntax" > Shell::quote_path< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > COMMAND< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > T< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "3-shl.html#SP5" class = "function-link" > < span class = "function-syntax" > Shell::run< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > COMMAND< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > DISCARD_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > COMMAND< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP4" > < / a > < b > § 4. < / b > This writes the traditional Unix shell syntax for redirecting the output
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from both < span class = "extract" > < span class = "extract-syntax" > stdout< / span > < / span > and < span class = "extract" > < span class = "extract-syntax" > stderr< / span > < / span > to the same named file.
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Shell::redirect< / span > < span class = "plain-syntax" > (< / span > < span class = "constant-syntax" > OUTPUT_STREAM< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > filename< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > F< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < a href = "3-shl.html#SP1" class = "function-link" > < span class = "function-syntax" > Shell::plain< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > OUT< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "> "< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "3-shl.html#SP1" class = "function-link" > < span class = "function-syntax" > Shell::quote_file< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > OUT< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > F< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "3-shl.html#SP1" class = "function-link" > < span class = "function-syntax" > Shell::plain< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > OUT< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "2> & 1"< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP5" > < / a > < b > § 5. Actual commands. < / b > The scheme is that commands are composed using the above functions, and
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then sent to this one.
< / p >
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< p class = "commentary" > We make the buffer here long enough for 8 filenames of worst-case length,
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all transcoded to UTF-8 in the most unlucky way imaginable.
< / p >
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< pre class = "definitions code-font" > < span class = "definition-keyword" > define< / span > < span class = "constant-syntax" > SPOOL_LENGTH< / span > < span class = "plain-syntax" > < / span > < span class = "constant-syntax" > 4< / span > < span class = "plain-syntax" > *8*< / span > < span class = "constant-syntax" > MAX_FILENAME_LENGTH< / span >
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< / pre >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > shell_verbosity< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > FALSE< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Shell::verbose< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > shell_verbosity< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > TRUE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Shell::run< / span > < button class = "popup" onclick = "togglePopup('usagePopup6')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup6" > Usage of < span class = "code-font" > < span class = "function-syntax" > Shell::run< / span > < / span > :< br / > < a href = "3-shl.html#SP2" > § 2< / a > , < a href = "3-shl.html#SP3" > § 3< / a > < br / > POSIX Platforms - < a href = "1-pp.html#SP16" > § 16< / a > < br / > Epub Ebooks - < a href = "5-ee.html#SP7_4_1" > § 7.4.1< / a > , < a href = "5-ee.html#SP7_4_2" > § 7.4.2< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "constant-syntax" > OUTPUT_STREAM< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > shell_verbosity< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > PRINT< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "shell: %S\n"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > OUT< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOGIF< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > SHELL_USAGE< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "shell: %S\n"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > OUT< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > spool< / span > < span class = "plain-syntax" > [< / span > < span class = "constant-syntax" > SPOOL_LENGTH< / span > < span class = "plain-syntax" > ];< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-str.html#SP32" class = "function-link" > < span class = "function-syntax" > Streams::write_as_locale_string< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > spool< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > OUT< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > SPOOL_LENGTH< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > debugger_mode< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "constant-syntax" > STDOUT< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "debugger mode suppressing shell command: %S\n"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > OUT< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > rv< / span > < span class = "plain-syntax" > = < / span > < a href = "1-wp.html#SP6" class = "function-link" > < span class = "function-syntax" > Platform::system< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > spool< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > rv< / span > < span class = "plain-syntax" > == -1) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "constant-syntax" > STDERR< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "shell: %S\n"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > OUT< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "OS shell error"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > rv< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > 127< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "constant-syntax" > STDERR< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "shell: %S\n"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > OUT< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "Execution of the shell failed"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > rv< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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< nav role = "progress" > < div class = "progresscontainer" >
< ul class = "progressbar" > < li class = "progressprev" > < a href = "3-cf.html" > ❮ < / a > < / li > < li class = "progresschapter" > < a href = "P-abgtf.html" > P< / a > < / li > < li class = "progresschapter" > < a href = "1-fm.html" > 1< / a > < / li > < li class = "progresschapter" > < a href = "2-dl.html" > 2< / a > < / li > < li class = "progresscurrentchapter" > 3< / li > < li class = "progresssection" > < a href = "3-em.html" > em< / a > < / li > < li class = "progresssection" > < a href = "3-cla.html" > cla< / a > < / li > < li class = "progresssection" > < a href = "3-pth.html" > pth< / a > < / li > < li class = "progresssection" > < a href = "3-fln.html" > fln< / a > < / li > < li class = "progresssection" > < a href = "3-cf.html" > cf< / a > < / li > < li class = "progresscurrent" > shl< / li > < li class = "progresssection" > < a href = "3-drc.html" > drc< / a > < / li > < li class = "progresssection" > < a href = "3-tm.html" > tm< / a > < / li > < li class = "progresschapter" > < a href = "4-chr.html" > 4< / a > < / li > < li class = "progresschapter" > < a href = "5-htm.html" > 5< / a > < / li > < li class = "progresschapter" > < a href = "6-bf.html" > 6< / a > < / li > < li class = "progresschapter" > < a href = "7-vn.html" > 7< / a > < / li > < li class = "progresschapter" > < a href = "8-ws.html" > 8< / a > < / li > < li class = "progressnext" > < a href = "3-drc.html" > ❯ < / a > < / li > < / ul > < / div >
< / nav > <!-- End of weave -->
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< / main >
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< / body >
< / html >
