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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 (i.e. similar to vtable pointers in OOP). 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. Move the fixed sized dirent.d_name buffer to the dirent-specific DIR structure, as d_name may be implementation specific (e.g. a caching implementation may just set d_name to point into the cache instead of copying the entire file name string). Signed-off-by: Karsten Blees <blees@dcon.de>
33 lines
802 B
C
33 lines
802 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; /* 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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