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b08f49f5ec
Emulating the POSIX `dirent` API on Windows via `FindFirstFile()`/`FindNextFile()` is pretty staightforward, however, most of the information provided in the `WIN32_FIND_DATA` structure is thrown away in the process. A more sophisticated implementation may cache this data, e.g. for later reuse in calls to `lstat()`. Make the `dirent` implementation pluggable so that it can be switched at runtime, e.g. based on a config option. Define a base DIR structure with pointers to `readdir()`/`closedir()` that match the `opendir()` implementation (similar to vtable pointers in Object-Oriented Programming). Define `readdir()`/`closedir()` so that they call the function pointers in the `DIR` structure. This allows to choose the `opendir()` implementation on a call-by-call basis. Make the fixed-size `dirent.d_name` buffer a flex array, as `d_name` may be implementation specific (e.g. a caching implementation may allocate a `struct dirent` with _just_ the size needed to hold the `d_name` in question). Signed-off-by: Karsten Blees <blees@dcon.de> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
33 lines
805 B
C
33 lines
805 B
C
#ifndef DIRENT_H
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#define DIRENT_H
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#define DT_UNKNOWN 0
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#define DT_DIR 1
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#define DT_REG 2
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#define DT_LNK 3
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struct dirent {
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unsigned char d_type; /* file type to prevent lstat after readdir */
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char d_name[FLEX_ARRAY]; /* file name */
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};
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/*
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* Base DIR structure, contains pointers to readdir/closedir implementations so
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* that opendir may choose a concrete implementation on a call-by-call basis.
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*/
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typedef struct DIR {
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struct dirent *(*preaddir)(struct DIR *dir);
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int (*pclosedir)(struct DIR *dir);
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} DIR;
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/* default dirent implementation */
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extern DIR *dirent_opendir(const char *dirname);
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/* current dirent implementation */
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extern DIR *(*opendir)(const char *dirname);
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#define readdir(dir) (dir->preaddir(dir))
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#define closedir(dir) (dir->pclosedir(dir))
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#endif /* DIRENT_H */
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