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A few style fixes and expand the comment a bit on what _fixtelldir() is

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doing.
This commit is contained in:
jhb 2015-05-06 15:25:20 +00:00
parent d1f9ba68ac
commit 30a578b448
1 changed files with 10 additions and 6 deletions
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16
lib/libc/gen/telldir.c
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@ -101,11 +101,12 @@ _seekdir(dirp, loc)
return;
if (lp->loc_loc == dirp->dd_loc && lp->loc_seek == dirp->dd_seek)
return;
/* If it's within the same chunk of data, don't bother reloading */
/* If it's within the same chunk of data, don't bother reloading. */
if (lp->loc_seek == dirp->dd_seek) {
/*
* If we go back to 0 don't make the next readdir
* trigger a call to getdirentries()
* trigger a call to getdirentries().
*/
if (lp->loc_loc == 0)
dirp->dd_flags |= __DTF_SKIPREAD;
@ -124,10 +125,13 @@ _seekdir(dirp, loc)
}
/*
* when we do a read and cross a boundary, any telldir we
* just did will have wrong information in it.
* We need to move it from "beyond the end of the previous chunk"
* to "the beginning of the new chunk"
* A call to telldir after readdir returns the last entry in a block
* returns a location that is after the end of the last entry in that
* block. However, that location doesn't refer to a valid directory
* entry. Instead, these locations should refer to the first entry in
* the next block. That location is not known until the next block is
* read, so readdir calls this function after fetching a new block to
* fix any such telldir locations.
*/
void
_fixtelldir(DIR *dirp, long oldseek, long oldloc)