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<!-- Weave of 'Case - Insensitive Filenames' generated by Inweb -->
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< ul class = "crumbs" > < li > < a href = "../index.html" > Home< / a > < / li > < li > < a href = "index.html" > foundation< / a > < / li > < li > < a href = "index.html#3" > Chapter 3: The Operating System< / a > < / li > < li > < b > Case-Insensitive Filenames< / b > < / li > < / ul > < / div >
< p class = "purpose" > On some of the Unix-derived file systems on which Inform runs, filenames are case-sensitive, so that FISH and fish might be different files. This makes extension files, installed by the user, prone to being missed. The code in this section provides a routine to carry out file opening as if filenames are case-insensitive, and is used only for extensions.< / p >
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< ul class = "toc" > < li > < a href = "3-cf.html#SP3" > § 3. The routine< / a > < / li > < li > < a href = "3-cf.html#SP3_1" > § 3.1. Looking for case-insensitive matches instead< / a > < / li > < li > < a href = "3-cf.html#SP3_3" > § 3.3. Allocation and deallocation< / a > < / li > < li > < a href = "3-cf.html#SP3_6" > § 3.6. Pathname hacking< / a > < / li > < li > < a href = "3-cf.html#SP4" > § 4. strrchr< / a > < / li > < li > < a href = "3-cf.html#SP5" > § 5. Counting matches< / a > < / li > < li > < a href = "3-cf.html#SP6" > § 6. Non-POSIX tail< / a > < / li > < / ul > < hr class = "tocbar" >
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< p class = "commentary firstcommentary" > < a id = "SP1" class = "paragraph-anchor" > < / a > < b > § 1. < / b > This section contains a single utility routine, contributed by Adam
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Thornton: a specialised, case-insensitive form of < span class = "extract" > < span class = "extract-syntax" > fopen()< / span > < / span > . It is specialised
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in that it is designed for opening extensions, where the file path will be
case-correct up to the last two components of the path (the leafname and the
immediately containing directory), but where the casing may be wrong in those
last two components.
< / p >
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< p class = "commentary firstcommentary" > < a id = "SP2" class = "paragraph-anchor" > < / a > < b > § 2. < / b > If the exact filename or extension directory (case-correct) exists,
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< span class = "extract" > < span class = "extract-syntax" > CIFilingSystem::fopen()< / span > < / span > will choose it to open. If not, it will
use < span class = "extract" > < span class = "extract-syntax" > strcasecmp()< / span > < / span > to find a file or directory with the same name but
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differing in case and use it instead. If it finds exactly one candidate file,
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it will then attempt to < span class = "extract" > < span class = "extract-syntax" > fopen()< / span > < / span > it and return the result.
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< / p >
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< p class = "commentary" > If < span class = "extract" > < span class = "extract-syntax" > CIFilingSystem::fopen()< / span > < / span > succeeds, it returns a < span class = "extract" > < span class = "extract-syntax" > FILE *< / span > < / span >
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(passed back to it from the underlying < span class = "extract" > < span class = "extract-syntax" > fopen()< / span > < / span > ). If
< span class = "extract" > < span class = "extract-syntax" > CIFilingSystem::fopen()< / span > < / span > fails, it returns < span class = "extract" > < span class = "extract-syntax" > NULL< / span > < / span > , and
< span class = "extract" > < span class = "extract-syntax" > errno< / span > < / span > is set accordingly:
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< / p >
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< ul class = "items" > < li > (a) If no suitable file was found, < span class = "extract" > < span class = "extract-syntax" > errno< / span > < / span > is set to < span class = "extract" > < span class = "extract-syntax" > ENOENT< / span > < / span > .
< / li > < li > (b) If more than one possibility was found, but none of them exactly match
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the supplied case, < span class = "extract" > < span class = "extract-syntax" > errno< / span > < / span > is set to < span class = "extract" > < span class = "extract-syntax" > EBADF< / span > < / span > .
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< / li > < li > (c) Note that if multiple directories which match case-insensitively are
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found, but none is an exact match, < span class = "extract" > < span class = "extract-syntax" > EBADF< / span > < / span > will be set regardless of the
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contents of the directories.
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< / li > < li > (d) If < span class = "extract" > < span class = "extract-syntax" > CIFilingSystem::fopen()< / span > < / span > fails during its allocation of
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space to hold its intermediate strings for comparison, or for its various
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data structures, < span class = "extract" > < span class = "extract-syntax" > errno< / span > < / span > is set to < span class = "extract" > < span class = "extract-syntax" > ENOMEM< / span > < / span > .
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< / li > < li > (e) If an unambiguous filename is found but the < span class = "extract" > < span class = "extract-syntax" > fopen()< / span > < / span > fails, < span class = "extract" > < span class = "extract-syntax" > errno< / span > < / span > is
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left at whatever value the underlying < span class = "extract" > < span class = "extract-syntax" > fopen()< / span > < / span > set it to.
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< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP3" class = "paragraph-anchor" > < / a > < b > § 3. The routine. < / b > The routine is available only on POSIX platforms where < span class = "extract" > < span class = "extract-syntax" > PLATFORM_POSIX< / span > < / span >
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is defined (see "Platform-Specific Definitions"). In practice this means
everywhere except Windows, but all Windows file systems are case-preserving
and case-insensitive in any case.
< / p >
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< p class = "commentary" > Briefly, we try to get the extension directory name right first, by looking
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for the given casing, then if that fails, for a unique alternative with
different casing; and then repeat within that directory for the extension
file itself.
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > FILE< / span > < span class = "plain-syntax" > *< / span > < a href = "3-cf.html#SP6" class = "function-link" > < span class = "function-syntax" > CIFilingSystem::fopen< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > const< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > path< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > const< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > mode< / span > < span class = "plain-syntax" > ) {< / 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" > topdirpath< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > , *< / span > < span class = "identifier-syntax" > ciextdirpath< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > , *< / span > < span class = "identifier-syntax" > cistring< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > , *< / span > < span class = "identifier-syntax" > ciextname< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / 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" > workstring< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > , *< / span > < span class = "identifier-syntax" > workstring2< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > DIR< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > topdir< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > , *< / span > < span class = "identifier-syntax" > extdir< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ; < / span > < span class = "reserved-syntax" > FILE< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > handle< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > size_t< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > length< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "comment-syntax" > for efficiency's sake, though it's logically equivalent, we try...< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > handle< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > fopen< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > path< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > mode< / span > < span class = "plain-syntax" > ); < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > handle< / span > < span class = "plain-syntax" > ) < / span > < span class = "named-paragraph-container code-font" > < a href = "3-cf.html#SP3_4" class = "named-paragraph-link" > < span class = "named-paragraph" > Happy ending to ci-fopen< / span > < span class = "named-paragraph-number" > 3.4< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "3-cf.html#SP3_6" class = "named-paragraph-link" > < span class = "named-paragraph" > Find the length of the path, giving an error if it is empty or NULL< / span > < span class = "named-paragraph-number" > 3.6< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "3-cf.html#SP3_3" class = "named-paragraph-link" > < span class = "named-paragraph" > Allocate memory for strings large enough to hold any subpath of the path< / span > < span class = "named-paragraph-number" > 3.3< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "3-cf.html#SP3_7" class = "named-paragraph-link" > < span class = "named-paragraph" > Parse the path to break it into topdir path, extension directory and leafname< / span > < span class = "named-paragraph-number" > 3.7< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > topdir< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > opendir< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > topdirpath< / span > < span class = "plain-syntax" > ); < / span > < span class = "comment-syntax" > whose pathname is assumed case-correct...< / 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" > topdir< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "named-paragraph-container code-font" > < a href = "3-cf.html#SP3_5" class = "named-paragraph-link" > < span class = "named-paragraph" > Sad ending to ci-fopen< / span > < span class = "named-paragraph-number" > 3.5< / span > < / a > < / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > ...so that failure is fatal; < / span > < span class = "extract" > < span class = "extract-syntax" > errno< / span > < / span > < span class = "comment-syntax" > is set by < / span > < span class = "extract" > < span class = "extract-syntax" > opendir< / span > < / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > sprintf< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > workstring< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "%s%c%s"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > topdirpath< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > FOLDER_SEPARATOR< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > ciextdirpath< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > extdir< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > opendir< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > workstring< / span > < span class = "plain-syntax" > ); < / span > < span class = "comment-syntax" > try with supplied extension directory name< / 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" > extdir< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "named-paragraph-container code-font" > < a href = "3-cf.html#SP3_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Try to find a unique insensitively matching directory name in topdir< / span > < span class = "named-paragraph-number" > 3.1< / span > < / a > < / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > strcpy< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > cistring< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > workstring< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > sprintf< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > workstring< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "%s%c%s"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > cistring< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > FOLDER_SEPARATOR< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > ciextname< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > handle< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > fopen< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > workstring< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > mode< / span > < span class = "plain-syntax" > ); < / span > < span class = "comment-syntax" > try with supplied name< / 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" > handle< / span > < span class = "plain-syntax" > ) < / span > < span class = "named-paragraph-container code-font" > < a href = "3-cf.html#SP3_4" class = "named-paragraph-link" > < span class = "named-paragraph" > Happy ending to ci-fopen< / span > < span class = "named-paragraph-number" > 3.4< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "3-cf.html#SP3_2" class = "named-paragraph-link" > < span class = "named-paragraph" > Try to find a unique insensitively matching entry in extdir< / span > < span class = "named-paragraph-number" > 3.2< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > }< / span >
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< / pre >
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< ul class = "endnotetexts" > < li > This paragraph is used only if PLATFORM_POSIX is defined.< / li > < li > The function CIFilingSystem::fopen is used in < a href = "3-cf.html#SP6" > § 6< / a > , Filenames (< a href = "3-fln.html#SP10" > § 10< / a > ).< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP3_1" class = "paragraph-anchor" > < / a > < b > § 3.1. Looking for case-insensitive matches instead. < / b > We emerge from the following only in the happy case where a unique matching
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directory name can be found.
< / p >
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< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Try to find a unique insensitively matching directory name in topdir< / span > < span class = "named-paragraph-number" > 3.1< / 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 = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > rc< / span > < span class = "plain-syntax" > = < / span > < a href = "3-cf.html#SP5" class = "function-link" > < span class = "function-syntax" > CIFilingSystem::match_in_directory< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > topdir< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > ciextdirpath< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > workstring< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > switch< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > rc< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > :< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > errno< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > ENOENT< / span > < span class = "plain-syntax" > ; < / span > < span class = "named-paragraph-container code-font" > < a href = "3-cf.html#SP3_5" class = "named-paragraph-link" > < span class = "named-paragraph" > Sad ending to ci-fopen< / span > < span class = "named-paragraph-number" > 3.5< / span > < / a > < / 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 = "constant-syntax" > 1< / span > < span class = "plain-syntax" > :< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > sprintf< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > cistring< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "%s%c%s"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > topdirpath< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > FOLDER_SEPARATOR< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > workstring< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > extdir< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > opendir< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > cistring< / 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" > extdir< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > errno< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > ENOENT< / span > < span class = "plain-syntax" > ; < / span > < span class = "named-paragraph-container code-font" > < a href = "3-cf.html#SP3_5" class = "named-paragraph-link" > < span class = "named-paragraph" > Sad ending to ci-fopen< / span > < span class = "named-paragraph-number" > 3.5< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< 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 = "identifier-syntax" > default:< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > errno< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > EBADF< / span > < span class = "plain-syntax" > ; < / span > < span class = "named-paragraph-container code-font" > < a href = "3-cf.html#SP3_5" class = "named-paragraph-link" > < span class = "named-paragraph" > Sad ending to ci-fopen< / span > < span class = "named-paragraph-number" > 3.5< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > }< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "3-cf.html#SP3" > § 3< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP3_2" class = "paragraph-anchor" > < / a > < b > § 3.2. < / b > More or less the same, but we never emerge at all: all cases of the switch
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return from the function.
< / p >
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< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Try to find a unique insensitively matching entry in extdir< / span > < span class = "named-paragraph-number" > 3.2< / 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 = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > rc< / span > < span class = "plain-syntax" > = < / span > < a href = "3-cf.html#SP5" class = "function-link" > < span class = "function-syntax" > CIFilingSystem::match_in_directory< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > extdir< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > ciextname< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > workstring< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > switch< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > rc< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > :< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > errno< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > ENOENT< / span > < span class = "plain-syntax" > ; < / span > < span class = "named-paragraph-container code-font" > < a href = "3-cf.html#SP3_5" class = "named-paragraph-link" > < span class = "named-paragraph" > Sad ending to ci-fopen< / span > < span class = "named-paragraph-number" > 3.5< / span > < / a > < / 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 = "constant-syntax" > 1< / span > < span class = "plain-syntax" > :< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > sprintf< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > workstring2< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "%s%c%s"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > cistring< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > FOLDER_SEPARATOR< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > workstring< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > workstring2< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > length< / 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" > handle< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > fopen< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > workstring2< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > mode< / 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" > handle< / span > < span class = "plain-syntax" > ) < / span > < span class = "named-paragraph-container code-font" > < a href = "3-cf.html#SP3_4" class = "named-paragraph-link" > < span class = "named-paragraph" > Happy ending to ci-fopen< / span > < span class = "named-paragraph-number" > 3.4< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > errno< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > ENOENT< / span > < span class = "plain-syntax" > ; < / span > < span class = "named-paragraph-container code-font" > < a href = "3-cf.html#SP3_5" class = "named-paragraph-link" > < span class = "named-paragraph" > Sad ending to ci-fopen< / span > < span class = "named-paragraph-number" > 3.5< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > default:< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > errno< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > EBADF< / span > < span class = "plain-syntax" > ; < / span > < span class = "named-paragraph-container code-font" > < a href = "3-cf.html#SP3_5" class = "named-paragraph-link" > < span class = "named-paragraph" > Sad ending to ci-fopen< / span > < span class = "named-paragraph-number" > 3.5< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > }< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "3-cf.html#SP3" > § 3< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP3_3" class = "paragraph-anchor" > < / a > < b > § 3.3. Allocation and deallocation. < / b > We use six strings to hold full or partial pathnames.
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< / p >
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< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Allocate memory for strings large enough to hold any subpath of the path< / span > < span class = "named-paragraph-number" > 3.3< / 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" > workstring< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > calloc< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > length< / span > < span class = "plain-syntax" > +1, < / span > < span class = "reserved-syntax" > sizeof< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > char< / 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" > workstring< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) { < / span > < span class = "identifier-syntax" > errno< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > ENOMEM< / span > < span class = "plain-syntax" > ; < / span > < span class = "named-paragraph-container code-font" > < a href = "3-cf.html#SP3_5" class = "named-paragraph-link" > < span class = "named-paragraph" > Sad ending to ci-fopen< / span > < span class = "named-paragraph-number" > 3.5< / span > < / a > < / span > < span class = "plain-syntax" > ; }< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > workstring2< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > calloc< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > length< / span > < span class = "plain-syntax" > +1, < / span > < span class = "reserved-syntax" > sizeof< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > char< / 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" > workstring2< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) { < / span > < span class = "identifier-syntax" > errno< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > ENOMEM< / span > < span class = "plain-syntax" > ; < / span > < span class = "named-paragraph-container code-font" > < a href = "3-cf.html#SP3_5" class = "named-paragraph-link" > < span class = "named-paragraph" > Sad ending to ci-fopen< / span > < span class = "named-paragraph-number" > 3.5< / span > < / a > < / span > < span class = "plain-syntax" > ; }< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > topdirpath< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > calloc< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > length< / span > < span class = "plain-syntax" > +1, < / span > < span class = "reserved-syntax" > sizeof< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > char< / 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" > topdirpath< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) { < / span > < span class = "identifier-syntax" > errno< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > ENOMEM< / span > < span class = "plain-syntax" > ; < / span > < span class = "named-paragraph-container code-font" > < a href = "3-cf.html#SP3_5" class = "named-paragraph-link" > < span class = "named-paragraph" > Sad ending to ci-fopen< / span > < span class = "named-paragraph-number" > 3.5< / span > < / a > < / span > < span class = "plain-syntax" > ; }< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > ciextdirpath< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > calloc< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > length< / span > < span class = "plain-syntax" > +1, < / span > < span class = "reserved-syntax" > sizeof< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > char< / 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" > ciextdirpath< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) { < / span > < span class = "identifier-syntax" > errno< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > ENOMEM< / span > < span class = "plain-syntax" > ; < / span > < span class = "named-paragraph-container code-font" > < a href = "3-cf.html#SP3_5" class = "named-paragraph-link" > < span class = "named-paragraph" > Sad ending to ci-fopen< / span > < span class = "named-paragraph-number" > 3.5< / span > < / a > < / span > < span class = "plain-syntax" > ; }< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > cistring< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > calloc< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > length< / span > < span class = "plain-syntax" > +1, < / span > < span class = "reserved-syntax" > sizeof< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > char< / 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" > cistring< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) { < / span > < span class = "identifier-syntax" > errno< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > ENOMEM< / span > < span class = "plain-syntax" > ; < / span > < span class = "named-paragraph-container code-font" > < a href = "3-cf.html#SP3_5" class = "named-paragraph-link" > < span class = "named-paragraph" > Sad ending to ci-fopen< / span > < span class = "named-paragraph-number" > 3.5< / span > < / a > < / span > < span class = "plain-syntax" > ; }< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > ciextname< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > calloc< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > length< / span > < span class = "plain-syntax" > +1, < / span > < span class = "reserved-syntax" > sizeof< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > char< / 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" > ciextname< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) { < / span > < span class = "identifier-syntax" > errno< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > ENOMEM< / span > < span class = "plain-syntax" > ; < / span > < span class = "named-paragraph-container code-font" > < a href = "3-cf.html#SP3_5" class = "named-paragraph-link" > < span class = "named-paragraph" > Sad ending to ci-fopen< / span > < span class = "named-paragraph-number" > 3.5< / span > < / a > < / span > < span class = "plain-syntax" > ; }< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "3-cf.html#SP3" > § 3< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP3_4" class = "paragraph-anchor" > < / a > < b > § 3.4. < / b > If we are successful, we return a valid file handle...
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< / p >
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< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Happy ending to ci-fopen< / span > < span class = "named-paragraph-number" > 3.4< / 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 = "named-paragraph-container code-font" > < a href = "3-cf.html#SP3_4_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Prepare to exit ci-fopen cleanly< / span > < span class = "named-paragraph-number" > 3.4.1< / span > < / a > < / 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" > handle< / span > < span class = "plain-syntax" > ;< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "3-cf.html#SP3" > § 3< / a > (twice), < a href = "3-cf.html#SP3_2" > § 3.2< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP3_5" class = "paragraph-anchor" > < / a > < b > § 3.5. < / b > ...and otherwise < span class = "extract" > < span class = "extract-syntax" > NULL< / span > < / span > , having already set < span class = "extract" > < span class = "extract-syntax" > errno< / span > < / span > with the reason why.
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< / p >
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< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Sad ending to ci-fopen< / span > < span class = "named-paragraph-number" > 3.5< / 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 = "named-paragraph-container code-font" > < a href = "3-cf.html#SP3_4_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Prepare to exit ci-fopen cleanly< / span > < span class = "named-paragraph-number" > 3.4.1< / span > < / a > < / 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" > NULL< / span > < span class = "plain-syntax" > ;< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "3-cf.html#SP3" > § 3< / a > , < a href = "3-cf.html#SP3_1" > § 3.1< / a > (three times), < a href = "3-cf.html#SP3_2" > § 3.2< / a > (three times), < a href = "3-cf.html#SP3_3" > § 3.3< / a > (6 times).< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP3_4_1" class = "paragraph-anchor" > < / a > < b > § 3.4.1. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Prepare to exit ci-fopen cleanly< / span > < span class = "named-paragraph-number" > 3.4.1< / 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 = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > workstring< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > free< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > workstring< / 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" > workstring2< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > free< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > workstring2< / 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" > topdirpath< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > free< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > topdirpath< / 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" > ciextdirpath< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > free< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ciextdirpath< / 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" > cistring< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > free< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > cistring< / 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" > ciextname< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > free< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ciextname< / 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" > topdir< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > closedir< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > topdir< / 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" > extdir< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > closedir< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > extdir< / span > < span class = "plain-syntax" > );< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "3-cf.html#SP3_4" > § 3.4< / a > , < a href = "3-cf.html#SP3_5" > § 3.5< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP3_6" class = "paragraph-anchor" > < / a > < b > § 3.6. Pathname hacking. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Find the length of the path, giving an error if it is empty or NULL< / span > < span class = "named-paragraph-number" > 3.6< / 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" > length< / 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" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > path< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > length< / span > < span class = "plain-syntax" > = (< / span > < span class = "identifier-syntax" > size_t< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > strlen< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > path< / 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" > length< / span > < span class = "plain-syntax" > < < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > ) { < / span > < span class = "identifier-syntax" > errno< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > ENOENT< / span > < span class = "plain-syntax" > ; < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ; }< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "3-cf.html#SP3" > § 3< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP3_7" class = "paragraph-anchor" > < / a > < b > § 3.7. < / b > And here we break up a pathname like
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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" > /Users/bobama/Library/Inform/Extensions/Hillary Clinton/Health Care.i7x< / span >
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< / pre >
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< p class = "commentary" > into three components:
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< / p >
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< ul class = "items" > < li > (a) < span class = "extract" > < span class = "extract-syntax" > topdirpath< / span > < / span > is < span class = "extract" > < span class = "extract-syntax" > /Users/bobama/Library/Inform/Extensions< / span > < / span > , and its casing is correct.
< / li > < li > (b) < span class = "extract" > < span class = "extract-syntax" > ciextdirpath< / span > < / span > is < span class = "extract" > < span class = "extract-syntax" > Hillary Clinton< / span > < / span > , but its casing may not be correct.
< / li > < li > (c) < span class = "extract" > < span class = "extract-syntax" > ciextname< / span > < / span > is < span class = "extract" > < span class = "extract-syntax" > Health Care.i7x< / span > < / span > , but its casing may not be correct.
< / li > < / ul >
< p class = "commentary" > The contents of < span class = "extract" > < span class = "extract-syntax" > workstring< / span > < / span > are not significant afterwards.
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< / p >
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< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Parse the path to break it into topdir path, extension directory and leafname< / span > < span class = "named-paragraph-number" > 3.7< / 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 = "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 = "identifier-syntax" > size_t< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > extdirindex< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > extindex< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > namelen< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > dirlen< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > = < / span > < a href = "3-cf.html#SP4" class = "function-link" > < span class = "function-syntax" > CIFilingSystem::strrchr< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > path< / 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" > p< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > extindex< / span > < span class = "plain-syntax" > = (< / span > < span class = "identifier-syntax" > size_t< / span > < span class = "plain-syntax" > ) (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > - < / span > < span class = "identifier-syntax" > path< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > namelen< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > length< / span > < span class = "plain-syntax" > - < / span > < span class = "identifier-syntax" > extindex< / span > < span class = "plain-syntax" > - < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > strncpy< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ciextname< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > path< / span > < span class = "plain-syntax" > + < / span > < span class = "identifier-syntax" > extindex< / span > < span class = "plain-syntax" > + < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > namelen< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > ciextname< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > namelen< / span > < span class = "plain-syntax" > ] = < / span > < span class = "constant-syntax" > 0< / 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" > extindex< / span > < span class = "plain-syntax" > > < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > strncpy< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > workstring< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > path< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > extindex< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > workstring< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > extindex< / span > < span class = "plain-syntax" > ] = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > = < / span > < a href = "3-cf.html#SP4" class = "function-link" > < span class = "function-syntax" > CIFilingSystem::strrchr< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > workstring< / 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" > p< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > extdirindex< / span > < span class = "plain-syntax" > = (< / span > < span class = "identifier-syntax" > size_t< / span > < span class = "plain-syntax" > ) (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > - < / span > < span class = "identifier-syntax" > workstring< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > strncpy< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > topdirpath< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > path< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > extdirindex< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > topdirpath< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > extdirindex< / 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" > dirlen< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > extindex< / span > < span class = "plain-syntax" > - < / span > < span class = "identifier-syntax" > extdirindex< / 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" > dirlen< / span > < span class = "plain-syntax" > > < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > dirlen< / span > < span class = "plain-syntax" > -= < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > strncpy< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ciextdirpath< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > path< / span > < span class = "plain-syntax" > + < / span > < span class = "identifier-syntax" > extdirindex< / span > < span class = "plain-syntax" > + < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > dirlen< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > ciextdirpath< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > dirlen< / span > < span class = "plain-syntax" > ] = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ;< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "3-cf.html#SP3" > § 3< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP4" class = "paragraph-anchor" > < / a > < b > § 4. strrchr. < / b > This is an elderly C library function, really, but rewritten so that it
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can recognise any folder separator character.
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > CIFilingSystem::strrchr< / 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" > CIFilingSystem::strrchr< / span > < / span > :< br / > < a href = "3-cf.html#SP3_7" > § 3.7< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > const< / span > < 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" > const< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > q< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / 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 = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < a href = "1-wp.html#SP4" class = "function-link" > < span class = "function-syntax" > Platform::is_folder_separator< / span > < / a > < 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 > < span class = "identifier-syntax" > q< / 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 = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > *) < / span > < span class = "identifier-syntax" > q< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP5" class = "paragraph-anchor" > < / a > < b > § 5. Counting matches. < / b > We count the number of names within the directory which case-insensitively
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match against < span class = "extract" > < span class = "extract-syntax" > name< / span > < / span > , and copy the last which matches into < span class = "extract" > < span class = "extract-syntax" > last_match< / span > < / span > .
This must be at least as long as < span class = "extract" > < span class = "extract-syntax" > name< / span > < / span > . (We ought to be just a little careful
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in case of improbable cases where the matched name contains a different
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number of characters from < span class = "extract" > < span class = "extract-syntax" > name< / span > < / span > , for instance because on a strict reading
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of Unicode "SS" is casing-equivalent to the eszet, but it's unlikely
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that many contemporary implementations of < span class = "extract" > < span class = "extract-syntax" > strcasecmp< / span > < / span > are aware of this,
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and in any case the code above contains much larger buffers than needed.)
< / 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" > CIFilingSystem::match_in_directory< / 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" > CIFilingSystem::match_in_directory< / span > < / span > :< br / > < a href = "3-cf.html#SP3_1" > § 3.1< / a > , < a href = "3-cf.html#SP3_2" > § 3.2< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > vd< / span > < span class = "plain-syntax" > ,< / 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" > name< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > last_match< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > DIR< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > d< / span > < span class = "plain-syntax" > = (< / span > < span class = "identifier-syntax" > DIR< / span > < span class = "plain-syntax" > *) < / span > < span class = "identifier-syntax" > vd< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > struct< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > dirent< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > dirp< / 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" > rc< / 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" > last_match< / span > < span class = "plain-syntax" > [0] = < / span > < span class = "constant-syntax" > 0< / 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" > dirp< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > readdir< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > d< / span > < span class = "plain-syntax" > )) != < / span > < span class = "identifier-syntax" > NULL< / 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" > strcasecmp< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > name< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > dirp< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > d_name< / 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" > rc< / span > < span class = "plain-syntax" > ++;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > strcpy< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > last_match< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > dirp< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > d_name< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > rc< / 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 = "SP6" class = "paragraph-anchor" > < / a > < b > § 6. Non-POSIX tail. < / b > On platforms without POSIX directory handling, we revert to regular < span class = "extract" > < span class = "extract-syntax" > fopen< / span > < / span > .
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > FILE< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > CIFilingSystem::fopen< / 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" > CIFilingSystem::fopen< / span > < / span > :< br / > < a href = "3-cf.html#SP3" > § 3< / a > < br / > Filenames - < a href = "3-fln.html#SP10" > § 10< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > const< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > path< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > const< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > mode< / 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" > fopen< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > path< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > mode< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This paragraph is used only if PLATFORM_POSIX is undefined.< / li > < / ul >
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< nav role = "progress" > < div class = "progresscontainer" >
< ul class = "progressbar" > < li class = "progressprev" > < a href = "3-fln.html" > ❮ < / a > < / li > < li class = "progresschapter" > < a href = "P-abgtf.html" > P< / a > < / li > < li class = "progresschapter" > < a href = "1-fm.html" > 1< / a > < / li > < li class = "progresschapter" > < a href = "2-dl.html" > 2< / a > < / li > < li class = "progresscurrentchapter" > 3< / li > < li class = "progresssection" > < a href = "3-em.html" > em< / a > < / li > < li class = "progresssection" > < a href = "3-cla.html" > cla< / a > < / li > < li class = "progresssection" > < a href = "3-pth.html" > pth< / a > < / li > < li class = "progresssection" > < a href = "3-fln.html" > fln< / a > < / li > < li class = "progresscurrent" > cf< / li > < li class = "progresssection" > < a href = "3-shl.html" > shl< / a > < / li > < li class = "progresssection" > < a href = "3-drc.html" > drc< / a > < / li > < li class = "progresssection" > < a href = "3-tm.html" > tm< / a > < / li > < li class = "progresschapter" > < a href = "4-chr.html" > 4< / a > < / li > < li class = "progresschapter" > < a href = "5-htm.html" > 5< / a > < / li > < li class = "progresschapter" > < a href = "6-bf.html" > 6< / a > < / li > < li class = "progresschapter" > < a href = "7-vn.html" > 7< / a > < / li > < li class = "progresschapter" > < a href = "8-ws.html" > 8< / a > < / li > < li class = "progressnext" > < a href = "3-shl.html" > ❯ < / a > < / li > < / ul > < / div >
< / nav > <!-- End of weave -->
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< / main >
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< / body >
< / html >
