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<!-- Weave of 'Wide Strings' 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#4" > Chapter 4: Text Handling< / a > < / li > < li > < b > Wide Strings< / b > < / li > < / ul > < / div >
< p class = "purpose" > A minimal library for handling wide C strings.< / p >
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< p class = "commentary firstcommentary" > < a id = "SP1" > < / a > < b > § 1. < / b > By "wide string", we mean an array of < span class = "extract" > < span class = "extract-syntax" > wchar_t< / span > < / span > . A pointer to this type
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is what is returned by an L-literal in ANSI C, such as < span class = "extract" > < span class = "extract-syntax" > L"look, I'm wide"< / span > < / span > .
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A wide string is essentially a C string but with characters stored in full
words instead of bytes. The character values should be Unicode code points.
< / p >
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< p class = "commentary" > We will do as little as possible with wide strings, and the following
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wrappers simply abstract the standard C library's handling.
< / 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 = "function-syntax" > Wide::len< / 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" > Wide::len< / span > < / span > :< br / > Tries and Avinues - < a href = "4-taa.html#SP2_3" > § 2.3< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > wchar_t< / 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 = "reserved-syntax" > return< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > wcslen< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > p< / 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 > On the rare occasions when we need to sort alphabetically we'll also call:
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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" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Wide::cmp< / 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" > Wide::cmp< / span > < / span > :< br / > HTML - < a href = "5-htm.html#SP21" > § 21< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > wchar_t< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > A< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > wchar_t< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > B< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > wcscmp< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > A< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > B< / 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 > < / p >
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< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Wide::atoi< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > wchar_t< / 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 = "reserved-syntax" > return< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > wcstol< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > 10< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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