37 lines
760 B
C
37 lines
760 B
C
#include <sys/types.h>
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#include <sys/dir.h>
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/*
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* seek to an entry in a directory.
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* Only values returned by "telldir" should be passed to seekdir.
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*/
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seekdir(dirp, loc)
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register DIR *dirp;
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long loc;
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{
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long curloc, base, offset;
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extern long telldir();
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extern struct direct *readdir();
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curloc = telldir(dirp);
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if (loc == curloc)
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return;
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base = loc & ~(DIRBLKSIZ - 1);
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offset = loc & (DIRBLKSIZ - 1);
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if (dirp->dd_loc != 0 && offset != 0 &&
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(curloc & ~(DIRBLKSIZ-1)) == base) {
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dirp->dd_loc = offset;
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return;
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}
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(void) lseek(dirp->dd_fd, base, 0);
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dirp->dd_loc = 0;
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dirp->dd_size = 0;
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if (offset == 0)
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(void) readdir(dirp);
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else {
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while (dirp->dd_loc < offset) {
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if (readdir(dirp) == (struct direct *) 0)
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return;
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}
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}
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}
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