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<!-- Weave of 'Writers and Loggers' 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#2" > Chapter 2: Memory, Streams and Collections< / a > < / li > < li > < b > Writers and Loggers< / b > < / li > < / ul > < / div >
< p class = "purpose" > Formatted text output to streams.< / p >
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< ul class = "toc" > < li > < a href = "2-wal.html#SP1" > § 1. Registration< / a > < / li > < li > < a href = "2-wal.html#SP6" > § 6. Writing< / a > < / li > < / ul > < hr class = "tocbar" >
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< p class = "commentary firstcommentary" > < a id = "SP1" > < / a > < b > § 1. Registration. < / b > The main function here is modelled on the "minimum < span class = "extract" > < span class = "extract-syntax" > printf< / span > < / span > " function
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used as an example in Kernighan and Ritchie, Chapter 7, but because it
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prints to streams, it combines the traditional functions < span class = "extract" > < span class = "extract-syntax" > printf< / span > < / span > , < span class = "extract" > < span class = "extract-syntax" > sprintf< / span > < / span >
and < span class = "extract" > < span class = "extract-syntax" > fprintf< / span > < / span > in one. It also contains a number of doohickeys to provide
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for a wider and extensible range of string interpolations.
< / p >
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< p class = "commentary" > Traditionally, in the C library, everything in the formatting string is
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literal except for < span class = "extract" > < span class = "extract-syntax" > %< / span > < / span > escapes: thus < span class = "extract" > < span class = "extract-syntax" > %d< / span > < / span > means "integer goes here", and
so on. We follow this but allow extra < span class = "extract" > < span class = "extract-syntax" > %< / span > < / span > escapes unknown to K& R, and we
also allow a further family of < span class = "extract" > < span class = "extract-syntax" > $< / span > < / span > escapes intended for the debugging log
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only; these are restricted to streams flagged as for debugging and generally
produce guru meditation numbers rather than user-friendly information.
< / p >
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< p class = "commentary" > Each escape, say < span class = "extract" > < span class = "extract-syntax" > %z< / span > < / span > , must be "registered" before use, and will be
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given one of the following categories:
< / p >
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< pre class = "definitions code-font" > < span class = "definition-keyword" > define< / span > < span class = "constant-syntax" > VACANT_ECAT< / span > < span class = "plain-syntax" > < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > < / span > < span class = "comment-syntax" > unregistered< / span >
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< span class = "definition-keyword" > define< / span > < span class = "constant-syntax" > POINTER_ECAT< / span > < span class = "plain-syntax" > < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > < / span > < span class = "comment-syntax" > data to be printed is a pointer to a structure< / span >
< span class = "definition-keyword" > define< / span > < span class = "constant-syntax" > INTSIZED_ECAT< / span > < span class = "plain-syntax" > < / span > < span class = "constant-syntax" > 2< / span > < span class = "plain-syntax" > < / span > < span class = "comment-syntax" > data to be printed is or fits into an integer< / span >
< span class = "definition-keyword" > define< / span > < span class = "constant-syntax" > WORDING_ECAT< / span > < span class = "plain-syntax" > < / span > < span class = "constant-syntax" > 3< / span > < span class = "plain-syntax" > < / span > < span class = "comment-syntax" > data to be printed is a < / span > < span class = "extract" > < span class = "extract-syntax" > wording< / span > < / span > < span class = "comment-syntax" > structure from inform7< / span >
< span class = "definition-keyword" > define< / span > < span class = "constant-syntax" > DIRECT_ECAT< / span > < span class = "plain-syntax" > < / span > < span class = "constant-syntax" > 4< / span > < span class = "plain-syntax" > < / span > < span class = "comment-syntax" > data must be printed directly by the code below< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP2" > < / a > < b > § 2. < / b > We'll start with < span class = "extract" > < span class = "extract-syntax" > %< / span > < / span > escapes, which generalise the familiar < span class = "extract" > < span class = "extract-syntax" > printf< / span > < / span >
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escapes such as < span class = "extract" > < span class = "extract-syntax" > %d< / span > < / span > . Cumbersomely, we need three sorts of escape: those where
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the variable argument token is a pointer, those where it's essentially an
integer, and those where it's a structure used only in the Inform 7 compiler
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called a < span class = "extract" > < span class = "extract-syntax" > wording< / span > < / span > . The standard C typechecker can't generalise across these,
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so we have to do everything three times. (And then we have to do all that twice,
because the loggers don't use format strings.)
< / p >
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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" > escapes_registered< / 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" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > escapes_category< / span > < span class = "plain-syntax" > [2][128]; < / span > < span class = "comment-syntax" > one of the < / span > < span class = "extract" > < span class = "extract-syntax" > *_ECAT< / span > < / span > < span class = "comment-syntax" > values above< / span >
< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > the_escapes< / span > < span class = "plain-syntax" > [2][128]; < / span > < span class = "comment-syntax" > the function to call to implement this< / span >
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< span class = "reserved-syntax" > typedef< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > writer_function< / span > < span class = "plain-syntax" > )(< / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *, < / span > < span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > *, < / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *);< / span >
< span class = "reserved-syntax" > typedef< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > writer_function_I< / span > < span class = "plain-syntax" > )(< / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *, < / span > < span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > *, < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > );< / span >
< span class = "reserved-syntax" > typedef< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > log_function< / span > < span class = "plain-syntax" > )(< / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *, < / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *);< / span >
< span class = "reserved-syntax" > typedef< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > log_function_I< / span > < span class = "plain-syntax" > )(< / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *, < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > #< / span > < span class = "identifier-syntax" > ifdef< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WORDS_MODULE< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > typedef< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > writer_function_W< / span > < span class = "plain-syntax" > )(< / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *, < / span > < span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > *, < / span > < span class = "identifier-syntax" > wording< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > typedef< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > log_function_W< / span > < span class = "plain-syntax" > )(< / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *, < / span > < span class = "identifier-syntax" > wording< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > #< / span > < span class = "identifier-syntax" > endif< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP3" > < / a > < b > § 3. < / b > < / 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" > Writers::log_escape_usage< / 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 = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > cat< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > cat< / span > < span class = "plain-syntax" > < < / span > < span class = "constant-syntax" > 2< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > cat< / 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" > alphanum< / span > < span class = "plain-syntax" > = < / span > < span class = "string-syntax" > "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOG< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "Vacant escapes: %s: "< / span > < span class = "plain-syntax" > , (< / span > < span class = "identifier-syntax" > cat< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > )?< / span > < span class = "string-syntax" > "%"< / span > < span class = "plain-syntax" > :< / span > < span class = "string-syntax" > "$"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > =0; < / span > < span class = "identifier-syntax" > alphanum< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ]; < / span > < span class = "identifier-syntax" > i< / 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" > escapes_category< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > cat< / span > < span class = "plain-syntax" > ][(< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > alphanum< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ]] == < / span > < span class = "constant-syntax" > VACANT_ECAT< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOG< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "%c"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > alphanum< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ]);< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > else< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOG< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "."< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOG< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "\n"< / span > < span class = "plain-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 = "SP4" > < / a > < b > § 4. < / b > That gives us a number of front doors:
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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" > Writers::register_writer< / 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" > Writers::register_writer< / span > < / span > :< br / > Foundation Module - < a href = "1-fm.html#SP8_1" > § 8.1< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > esc< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > )(< / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *, < / span > < span class = "reserved-syntax" > char< / 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 > < a href = "2-wal.html#SP5" class = "function-link" > < span class = "function-syntax" > Writers::register_writer_p< / span > < / a > < span class = "plain-syntax" > (0, < / span > < span class = "identifier-syntax" > esc< / span > < span class = "plain-syntax" > , (< / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *) < / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > POINTER_ECAT< / 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" > Writers::register_logger< / 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" > Writers::register_logger< / span > < / span > :< br / > Foundation Module - < a href = "1-fm.html#SP8_3" > § 8.3< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > esc< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > )(< / span > < span class = "reserved-syntax" > text_stream< / 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 > < a href = "2-wal.html#SP5" class = "function-link" > < span class = "function-syntax" > Writers::register_writer_p< / span > < / a > < span class = "plain-syntax" > (1, < / span > < span class = "identifier-syntax" > esc< / span > < span class = "plain-syntax" > , (< / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *) < / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > POINTER_ECAT< / 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" > Writers::register_writer_I< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > esc< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > )(< / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *, < / span > < span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > *, < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > )) {< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-wal.html#SP5" class = "function-link" > < span class = "function-syntax" > Writers::register_writer_p< / span > < / a > < span class = "plain-syntax" > (0, < / span > < span class = "identifier-syntax" > esc< / span > < span class = "plain-syntax" > , (< / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *) < / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > INTSIZED_ECAT< / 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" > Writers::register_logger_I< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > esc< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > )(< / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *, < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > )) {< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-wal.html#SP5" class = "function-link" > < span class = "function-syntax" > Writers::register_writer_p< / span > < / a > < span class = "plain-syntax" > (1, < / span > < span class = "identifier-syntax" > esc< / span > < span class = "plain-syntax" > , (< / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *) < / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > INTSIZED_ECAT< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > #< / span > < span class = "identifier-syntax" > ifdef< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WORDS_MODULE< / span >
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< span class = "plain-syntax" > #< / span > < span class = "identifier-syntax" > define< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Writers::register_writer_W< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > esc< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > ) < / span > < a href = "2-wal.html#SP5" class = "function-link" > < span class = "function-syntax" > Writers::register_writer_p< / span > < / a > < span class = "plain-syntax" > (0, < / span > < span class = "identifier-syntax" > esc< / span > < span class = "plain-syntax" > , (< / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *) < / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > WORDING_ECAT< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > #< / span > < span class = "identifier-syntax" > define< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Writers::register_logger_W< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > esc< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > ) < / span > < a href = "2-wal.html#SP5" class = "function-link" > < span class = "function-syntax" > Writers::register_writer_p< / span > < / a > < span class = "plain-syntax" > (1, < / span > < span class = "identifier-syntax" > esc< / span > < span class = "plain-syntax" > , (< / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *) < / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > WORDING_ECAT< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > #< / span > < span class = "identifier-syntax" > endif< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP5" > < / a > < b > § 5. < / b > All leading to:
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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" > Writers::register_writer_p< / 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" > Writers::register_writer_p< / span > < / span > :< br / > < a href = "2-wal.html#SP4" > § 4< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > set< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > esc< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > cat< / 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" > escapes_registered< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > FALSE< / span > < span class = "plain-syntax" > ) < / span > < span class = "named-paragraph-container code-font" > < a href = "2-wal.html#SP5_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Initialise the table of escapes< / span > < span class = "named-paragraph-number" > 5.1< / span > < / a > < / 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" > esc< / span > < span class = "plain-syntax" > < < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ) || (< / span > < span class = "identifier-syntax" > esc< / span > < span class = "plain-syntax" > > = < / span > < span class = "constant-syntax" > 128< / span > < span class = "plain-syntax" > ) ||< / span >
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< span class = "plain-syntax" > ((< / span > < a href = "4-chr.html#SP1" class = "function-link" > < span class = "function-syntax" > Characters::isalpha< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > esc< / span > < span class = "plain-syntax" > ) == < / span > < span class = "constant-syntax" > FALSE< / span > < span class = "plain-syntax" > ) & & (< / span > < a href = "4-chr.html#SP1" class = "function-link" > < span class = "function-syntax" > Characters::isdigit< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > esc< / span > < span class = "plain-syntax" > ) == < / span > < span class = "constant-syntax" > FALSE< / span > < span class = "plain-syntax" > )))< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "nonalphabetic escape"< / 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" > escapes_category< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > set< / span > < span class = "plain-syntax" > ][< / span > < span class = "identifier-syntax" > esc< / span > < span class = "plain-syntax" > ] != < / span > < span class = "constant-syntax" > VACANT_ECAT< / 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" > "Clashing escape is %s%c\n"< / span > < span class = "plain-syntax" > , (< / span > < span class = "identifier-syntax" > set< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > )?< / span > < span class = "string-syntax" > "%"< / span > < span class = "plain-syntax" > :< / span > < span class = "string-syntax" > "$"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > esc< / 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" > "clash of escapes"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > escapes_category< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > set< / span > < span class = "plain-syntax" > ][< / span > < span class = "identifier-syntax" > esc< / span > < span class = "plain-syntax" > ] = < / span > < span class = "identifier-syntax" > cat< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > the_escapes< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > set< / span > < span class = "plain-syntax" > ][< / span > < span class = "identifier-syntax" > esc< / span > < span class = "plain-syntax" > ] = < / span > < span class = "identifier-syntax" > f< / 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 = "SP5_1" > < / a > < b > § 5.1. < / b > We're going to implement < span class = "extract" > < span class = "extract-syntax" > %d< / span > < / span > and a few others directly, so those are marked
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in the table as being unavailable for registration.
< / p >
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< p class = "commentary" > Note that we don't support < span class = "extract" > < span class = "extract-syntax" > %f< / span > < / span > for floats; but we do add our very own < span class = "extract" > < span class = "extract-syntax" > %w< / span > < / span >
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for wide strings.
< / p >
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< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Initialise the table of escapes< / span > < span class = "named-paragraph-number" > 5.1< / span > < / span > < span class = "comment-syntax" > =< / 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 = "plain-syntax" > < / span > < span class = "identifier-syntax" > escapes_registered< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > TRUE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > e< / span > < span class = "plain-syntax" > =0; < / span > < span class = "identifier-syntax" > e< / span > < span class = "plain-syntax" > < 2; < / span > < span class = "identifier-syntax" > e< / span > < span class = "plain-syntax" > ++)< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > =0; < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > < 128; < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ++) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > the_escapes< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > e< / span > < span class = "plain-syntax" > ][< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ] = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > escapes_category< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > e< / span > < span class = "plain-syntax" > ][< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ] = < / span > < span class = "constant-syntax" > VACANT_ECAT< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > escapes_category< / span > < span class = "plain-syntax" > [0][< / span > < span class = "character-syntax" > 'c'< / span > < span class = "plain-syntax" > ] = < / span > < span class = "constant-syntax" > DIRECT_ECAT< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > escapes_category< / span > < span class = "plain-syntax" > [0][< / span > < span class = "character-syntax" > 'd'< / span > < span class = "plain-syntax" > ] = < / span > < span class = "constant-syntax" > DIRECT_ECAT< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > escapes_category< / span > < span class = "plain-syntax" > [0][< / span > < span class = "character-syntax" > 'g'< / span > < span class = "plain-syntax" > ] = < / span > < span class = "constant-syntax" > DIRECT_ECAT< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > escapes_category< / span > < span class = "plain-syntax" > [0][< / span > < span class = "character-syntax" > 'i'< / span > < span class = "plain-syntax" > ] = < / span > < span class = "constant-syntax" > DIRECT_ECAT< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > escapes_category< / span > < span class = "plain-syntax" > [0][< / span > < span class = "character-syntax" > 's'< / span > < span class = "plain-syntax" > ] = < / span > < span class = "constant-syntax" > DIRECT_ECAT< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > escapes_category< / span > < span class = "plain-syntax" > [0][< / span > < span class = "character-syntax" > 'w'< / span > < span class = "plain-syntax" > ] = < / span > < span class = "constant-syntax" > DIRECT_ECAT< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > escapes_category< / span > < span class = "plain-syntax" > [0][< / span > < span class = "character-syntax" > 'x'< / span > < span class = "plain-syntax" > ] = < / span > < span class = "constant-syntax" > DIRECT_ECAT< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > escapes_category< / span > < span class = "plain-syntax" > [0][< / span > < span class = "character-syntax" > '%'< / span > < span class = "plain-syntax" > ] = < / span > < span class = "constant-syntax" > DIRECT_ECAT< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > escapes_category< / span > < span class = "plain-syntax" > [0][< / span > < span class = "character-syntax" > '$'< / span > < span class = "plain-syntax" > ] = < / span > < span class = "constant-syntax" > DIRECT_ECAT< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > escapes_category< / span > < span class = "plain-syntax" > [1][< / span > < span class = "character-syntax" > '%'< / span > < span class = "plain-syntax" > ] = < / span > < span class = "constant-syntax" > DIRECT_ECAT< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > escapes_category< / span > < span class = "plain-syntax" > [1][< / span > < span class = "character-syntax" > '$'< / span > < span class = "plain-syntax" > ] = < / span > < span class = "constant-syntax" > DIRECT_ECAT< / span > < span class = "plain-syntax" > ;< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "2-wal.html#SP5" > § 5< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP6" > < / a > < b > § 6. Writing. < / b > We can finally get on with that formatted-print function we've all been
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waiting for:
< / 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" > Writers::printf< / 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" > Writers::printf< / span > < / span > :< br / > Streams - < a href = "2-str.html#SP3" > § 3< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > stream< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > fmt< / span > < span class = "plain-syntax" > , ...) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > va_list< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > ap< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > the variable argument list signified by the dots< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > p< / 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" > stream< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > va_start< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ap< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > fmt< / span > < span class = "plain-syntax" > ); < / span > < span class = "comment-syntax" > macro to begin variable argument processing< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > fmt< / span > < span class = "plain-syntax" > ; *< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > ++) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > switch< / span > < span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "character-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" > set< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ; < / span > < span class = "named-paragraph-container code-font" > < a href = "2-wal.html#SP6_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Deal with escape sequences< / span > < span class = "named-paragraph-number" > 6.1< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "character-syntax" > '$'< / span > < span class = "plain-syntax" > : {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > set< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 1< / 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" > stream< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > stream_flags< / span > < span class = "plain-syntax" > ) & < / span > < span class = "constant-syntax" > USES_LOG_ESCAPES_STRF< / span > < span class = "plain-syntax" > )< / span >
2020-04-27 22:43:23 +00:00
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "2-wal.html#SP6_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Deal with escape sequences< / span > < span class = "named-paragraph-number" > 6.1< / span > < / a > < / span >
2020-04-21 23:52:25 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > < / span > < a href = "2-str.html#SP35" class = "function-link" > < span class = "function-syntax" > Streams::putc< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "character-syntax" > '$'< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > stream< / span > < span class = "plain-syntax" > );< / span >
2020-04-21 16:55:17 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "character-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" > stream< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > stream_flags< / span > < span class = "plain-syntax" > & < / span > < span class = "constant-syntax" > USES_I6_ESCAPES_STRF< / span > < span class = "plain-syntax" > )< / span >
2020-04-21 23:52:25 +00:00
< span class = "plain-syntax" > < / span > < a href = "2-str.html#SP35" class = "function-link" > < span class = "function-syntax" > Streams::putc< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "character-syntax" > '~'< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > stream< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > < / span > < a href = "2-str.html#SP35" class = "function-link" > < span class = "function-syntax" > Streams::putc< / span > < / a > < span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > stream< / span > < span class = "plain-syntax" > );< / span >
2020-04-21 16:55:17 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "character-syntax" > '\n'< / span > < span class = "plain-syntax" > :< / span >
2020-04-21 23:52:25 +00:00
< span class = "plain-syntax" > < / span > < a href = "2-str.html#SP35" class = "function-link" > < span class = "function-syntax" > Streams::putc< / span > < / a > < span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > stream< / span > < span class = "plain-syntax" > );< / span >
2020-04-21 16:55:17 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
2020-04-21 23:52:25 +00:00
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > default:< / span > < span class = "plain-syntax" > < / span > < a href = "2-str.html#SP35" class = "function-link" > < span class = "function-syntax" > Streams::putc< / span > < / a > < span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > stream< / span > < span class = "plain-syntax" > ); < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
2020-04-21 16:55:17 +00:00
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > }< / span >
2020-04-24 23:06:02 +00:00
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > va_end< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ap< / span > < span class = "plain-syntax" > ); < / span > < span class = "comment-syntax" > macro to end variable argument processing< / span >
2020-04-21 16:55:17 +00:00
< span class = "plain-syntax" > }< / span >
2020-04-24 10:26:18 +00:00
< / pre >
2020-04-25 10:33:39 +00:00
< p class = "commentary firstcommentary" > < a id = "SP6_1" > < / a > < b > § 6.1. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Deal with escape sequences< / span > < span class = "named-paragraph-number" > 6.1< / span > < / span > < span class = "comment-syntax" > =< / span >
2020-04-24 10:26:18 +00:00
< / p >
2020-04-25 10:33:39 +00:00
< pre class = "displayed-code all-displayed-code code-font" >
2020-04-21 16:55:17 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > format_string< / span > < span class = "plain-syntax" > [8];< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > esc_number< / span > < span class = "plain-syntax" > = < / span > < span class = "character-syntax" > ' '< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > format_string< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ++] = *(< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > ++);< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > while< / span > < span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > format_string< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ++] = *< / span > < span class = "identifier-syntax" > p< / 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" > islower< / span > < span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > )) || (< / span > < span class = "identifier-syntax" > isupper< / span > < span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > )) || ((< / span > < span class = "identifier-syntax" > set< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > ) & & (< / span > < span class = "identifier-syntax" > isdigit< / span > < span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > ))) ||< / span >
< span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > == < / span > < span class = "character-syntax" > '%'< / span > < span class = "plain-syntax" > )) < / span > < span class = "identifier-syntax" > esc_number< / span > < span class = "plain-syntax" > = (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > ) *< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > p< / 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" > esc_number< / span > < span class = "plain-syntax" > != < / span > < span class = "character-syntax" > ' '< / span > < span class = "plain-syntax" > ) || (< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ==6)) < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > format_string< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ] = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > p< / 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" > esc_number< / span > < span class = "plain-syntax" > < 0) || (< / span > < span class = "identifier-syntax" > esc_number< / span > < span class = "plain-syntax" > > < / span > < span class = "constant-syntax" > 255< / span > < span class = "plain-syntax" > )) < / span > < span class = "identifier-syntax" > esc_number< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > switch< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > escapes_category< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > set< / span > < span class = "plain-syntax" > ][< / span > < span class = "identifier-syntax" > esc_number< / span > < span class = "plain-syntax" > ]) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > POINTER_ECAT:< / 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" > set< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > writer_function< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > = (< / span > < span class = "identifier-syntax" > writer_function< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > the_escapes< / span > < span class = "plain-syntax" > [0][< / span > < span class = "identifier-syntax" > esc_number< / span > < span class = "plain-syntax" > ];< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > q< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > va_arg< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ap< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *);< / span >
< span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > )(< / span > < span class = "identifier-syntax" > stream< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > format_string< / span > < span class = "plain-syntax" > +1, < / span > < span class = "identifier-syntax" > q< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > } < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > log_function< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > = (< / span > < span class = "identifier-syntax" > log_function< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > the_escapes< / span > < span class = "plain-syntax" > [1][< / span > < span class = "identifier-syntax" > esc_number< / span > < span class = "plain-syntax" > ];< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > q< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > va_arg< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ap< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *);< / span >
< span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > )(< / span > < span class = "identifier-syntax" > stream< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > q< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > INTSIZED_ECAT:< / 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" > set< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > writer_function_I< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > = (< / span > < span class = "identifier-syntax" > writer_function_I< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > the_escapes< / span > < span class = "plain-syntax" > [0][< / span > < span class = "identifier-syntax" > esc_number< / span > < span class = "plain-syntax" > ];< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > N< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > va_arg< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ap< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > )(< / span > < span class = "identifier-syntax" > stream< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > format_string< / span > < span class = "plain-syntax" > +1, < / span > < span class = "identifier-syntax" > N< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > } < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > log_function_I< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > = (< / span > < span class = "identifier-syntax" > log_function_I< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > the_escapes< / span > < span class = "plain-syntax" > [1][< / span > < span class = "identifier-syntax" > esc_number< / span > < span class = "plain-syntax" > ];< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > N< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > va_arg< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ap< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > )(< / span > < span class = "identifier-syntax" > stream< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > N< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WORDING_ECAT:< / span > < span class = "plain-syntax" > {< / span >
< span class = "plain-syntax" > #< / span > < span class = "identifier-syntax" > ifdef< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WORDS_MODULE< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > set< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > writer_function_W< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > = (< / span > < span class = "identifier-syntax" > writer_function_W< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > the_escapes< / span > < span class = "plain-syntax" > [0][< / span > < span class = "identifier-syntax" > esc_number< / span > < span class = "plain-syntax" > ];< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > wording< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > W< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > va_arg< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ap< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > wording< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > )(< / span > < span class = "identifier-syntax" > stream< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > format_string< / span > < span class = "plain-syntax" > +1, < / span > < span class = "identifier-syntax" > W< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > } < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > log_function_W< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > = (< / span > < span class = "identifier-syntax" > log_function_W< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > the_escapes< / span > < span class = "plain-syntax" > [1][< / span > < span class = "identifier-syntax" > esc_number< / span > < span class = "plain-syntax" > ];< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > wording< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > W< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > va_arg< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ap< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > wording< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > f< / span > < span class = "plain-syntax" > )(< / span > < span class = "identifier-syntax" > stream< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > W< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > #< / span > < span class = "identifier-syntax" > endif< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
2020-04-27 22:43:23 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > DIRECT_ECAT:< / span > < span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "2-wal.html#SP6_1_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Implement this using the original printf< / span > < span class = "named-paragraph-number" > 6.1.1< / span > < / a > < / span > < span class = "plain-syntax" > ; < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
2020-04-21 16:55:17 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > VACANT_ECAT:< / 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" > "*** Bad WRITE escape: < %s> ***\n"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > format_string< / 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" > "Unknown string escape"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "2-wal.html#SP6" > § 6< / a > (twice).< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP6_1_1" > < / a > < b > § 6.1.1. < / b > Here the traditional C library helps us out with the difficult ones to get
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right. We don't trouble to check that correct < span class = "extract" > < span class = "extract-syntax" > printf< / span > < / span > escapes have been used:
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instead, we pass anything in the form of a percentage sign, followed by
up to four nonalphabetic modifying characters, followed by an alphabetic
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category character for numerical printing, straight through to < span class = "extract" > < span class = "extract-syntax" > sprintf< / span > < / span >
or < span class = "extract" > < span class = "extract-syntax" > fprintf< / span > < / span > .
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< / p >
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< p class = "commentary" > Thus an escape like < span class = "extract" > < span class = "extract-syntax" > %04d< / span > < / span > is handled by the standard C library, but not
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< span class = "extract" > < span class = "extract-syntax" > %s< / span > < / span > , which we handle directly. That's for two reasons: first, we want to
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be careful to prevent overruns of memory streams; second, we need to ensure
that the correct encoding is used when writing to disc. The numerical
escapes involve only characters whose representation is the same in all our
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file encodings, but expanding < span class = "extract" > < span class = "extract-syntax" > %s< / span > < / span > does not.
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< / p >
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< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Implement this using the original printf< / span > < span class = "named-paragraph-number" > 6.1.1< / span > < / span > < span class = "comment-syntax" > =< / 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 = "plain-syntax" > #< / span > < span class = "identifier-syntax" > pragma< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > clang< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > diagnostic< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > push< / span >
< span class = "plain-syntax" > #< / span > < span class = "identifier-syntax" > pragma< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > clang< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > diagnostic< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > ignored< / span > < span class = "plain-syntax" > < / span > < span class = "string-syntax" > "-Wformat-nonliteral"< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > switch< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > esc_number< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "character-syntax" > 'c'< / span > < span class = "plain-syntax" > : < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "character-syntax" > 'd'< / span > < span class = "plain-syntax" > : < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "character-syntax" > 'i'< / span > < span class = "plain-syntax" > : < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "character-syntax" > 'x'< / span > < span class = "plain-syntax" > : { < / span > < span class = "comment-syntax" > < / span > < span class = "extract" > < span class = "extract-syntax" > char< / span > < / span > < span class = "comment-syntax" > is promoted to < / span > < span class = "extract" > < span class = "extract-syntax" > int< / span > < / span > < span class = "comment-syntax" > in variable arguments< / 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" > ival< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > va_arg< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ap< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > int< / 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" > temp< / span > < span class = "plain-syntax" > [256];< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > snprintf< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > temp< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > 255< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > format_string< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > ival< / span > < span class = "plain-syntax" > ) > = < / span > < span class = "constant-syntax" > 255< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > strcpy< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > temp< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "?"< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > j< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > temp< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > j< / span > < span class = "plain-syntax" > ]; < / span > < span class = "identifier-syntax" > j< / span > < span class = "plain-syntax" > ++) < / span > < a href = "2-str.html#SP35" class = "function-link" > < span class = "function-syntax" > Streams::putc< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > temp< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > j< / span > < span class = "plain-syntax" > ], < / span > < span class = "identifier-syntax" > stream< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "character-syntax" > 'g'< / span > < span class = "plain-syntax" > : {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > double< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > dval< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > va_arg< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ap< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > double< / 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" > temp< / span > < span class = "plain-syntax" > [256];< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > snprintf< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > temp< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > 255< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > format_string< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > dval< / span > < span class = "plain-syntax" > ) > = < / span > < span class = "constant-syntax" > 255< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > strcpy< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > temp< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "?"< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > j< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > temp< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > j< / span > < span class = "plain-syntax" > ]; < / span > < span class = "identifier-syntax" > j< / span > < span class = "plain-syntax" > ++) < / span > < a href = "2-str.html#SP35" class = "function-link" > < span class = "function-syntax" > Streams::putc< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > temp< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > j< / span > < span class = "plain-syntax" > ], < / span > < span class = "identifier-syntax" > stream< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "character-syntax" > 's'< / span > < span class = "plain-syntax" > :< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > sval< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > va_arg< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ap< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > *); *< / span > < span class = "identifier-syntax" > sval< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > sval< / span > < span class = "plain-syntax" > ++) < / span > < a href = "2-str.html#SP35" class = "function-link" > < span class = "function-syntax" > Streams::putc< / span > < / a > < span class = "plain-syntax" > (*< / span > < span class = "identifier-syntax" > sval< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > stream< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "character-syntax" > 'w'< / span > < span class = "plain-syntax" > : {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > wchar_t< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > W< / span > < span class = "plain-syntax" > = (< / span > < span class = "identifier-syntax" > wchar_t< / span > < span class = "plain-syntax" > *) < / span > < span class = "identifier-syntax" > va_arg< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ap< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > wchar_t< / span > < span class = "plain-syntax" > *);< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > j< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > W< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > j< / span > < span class = "plain-syntax" > ]; < / span > < span class = "identifier-syntax" > j< / span > < span class = "plain-syntax" > ++) < / span > < a href = "2-str.html#SP35" class = "function-link" > < span class = "function-syntax" > Streams::putc< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > W< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > j< / span > < span class = "plain-syntax" > ], < / span > < span class = "identifier-syntax" > stream< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "character-syntax" > '%'< / span > < span class = "plain-syntax" > : < / span > < a href = "2-str.html#SP35" class = "function-link" > < span class = "function-syntax" > Streams::putc< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "character-syntax" > '%'< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > stream< / span > < span class = "plain-syntax" > ); < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "character-syntax" > '$'< / span > < span class = "plain-syntax" > : < / span > < a href = "2-str.html#SP35" class = "function-link" > < span class = "function-syntax" > Streams::putc< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "character-syntax" > '$'< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > stream< / span > < span class = "plain-syntax" > ); < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > #< / span > < span class = "identifier-syntax" > pragma< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > clang< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > diagnostic< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pop< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "2-wal.html#SP6_1" > § 6.1< / a > .< / li > < / ul >
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< nav role = "progress" > < div class = "progresscontainer" >
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< ul class = "progressbar" > < li class = "progressprev" > < a href = "2-str.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 = "progresscurrentchapter" > 2< / li > < li class = "progresssection" > < a href = "2-dl.html" > dl< / a > < / li > < li class = "progresssection" > < a href = "2-mmr.html" > mmr< / a > < / li > < li class = "progresssection" > < a href = "2-fc.html" > fc< / a > < / li > < li class = "progresssection" > < a href = "2-str.html" > str< / a > < / li > < li class = "progresscurrent" > wal< / li > < li class = "progresssection" > < a href = "2-mth.html" > mth< / a > < / li > < li class = "progresssection" > < a href = "2-llas.html" > llas< / a > < / li > < li class = "progresssection" > < a href = "2-dct.html" > dct< / a > < / li > < li class = "progresssection" > < a href = "2-trs.html" > trs< / a > < / li > < li class = "progresschapter" > < a href = "3-em.html" > 3< / 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 = "2-mth.html" > ❯ < / a > < / li > < / ul > < / div >
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< / nav > <!-- End of weave -->
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< / main >
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< / body >
< / html >
