51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
/*
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* Copyright (c) 2011, 2014, 2015 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* dirent/readdir.c
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* Reads a directory entry from a directory stream into a DIR-specific buffer.
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*/
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#include <sys/readdirents.h>
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#include <dirent.h>
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#include <errno.h>
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#include <stdlib.h>
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struct dirent* readdir(DIR* dir)
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{
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int old_errno = errno;
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struct dirent fallback;
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struct dirent* entry = dir->entry ? dir->entry : &fallback;
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size_t size = dir->entry ? dir->size : sizeof(fallback);
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ssize_t amount;
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while ( (amount = readdirents(dir->fd, entry, size)) < 0 )
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{
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if ( errno != ERANGE )
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return NULL;
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errno = old_errno;
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size_t needed = entry->d_reclen;
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free(dir->entry);
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dir->entry = NULL;
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struct dirent* new_dirent = (struct dirent*) malloc(needed);
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if ( !new_dirent )
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return NULL;
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entry = dir->entry = new_dirent;
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size = dir->size = needed;
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}
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if ( amount == 0 )
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return NULL;
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return dir->entry;
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}
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