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91 lines
3.9 KiB
C
91 lines
3.9 KiB
C
/*****************************************************************************/
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/* */
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/* readdir.c */
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/* */
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/* Read directory entry */
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/* */
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/* */
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/* */
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/* (C) 2005 Oliver Schmidt, <ol.sc@web.de> */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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#include <stddef.h>
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#include <unistd.h>
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#include <dirent.h>
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#include "dir.h"
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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struct dirent* __fastcall__ readdir (register DIR* dir)
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{
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register unsigned char* entry;
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/* Search for the next active directory entry */
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do {
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/* Read next directory block if necessary */
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if (dir->current_entry == dir->entries_per_block) {
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if (read (dir->fd,
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dir->block.bytes,
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sizeof (dir->block)) != sizeof (dir->block)) {
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/* Just return failure as read() has */
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/* set errno if (and only if) no EOF */
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return NULL;
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}
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/* Start with first entry in next block */
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dir->current_entry = 0;
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}
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/* Compute pointer to current entry */
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entry = dir->block.content.entries +
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dir->current_entry * dir->entry_length;
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/* Switch to next entry */
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++dir->current_entry;
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} while (entry[0x00] == 0);
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/* Move creation date/time to allow for next step below */
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*(unsigned long*)&entry[0x1A] = *(unsigned long*)&entry[0x18];
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/* Feature unsigned long access to EOF by extension from 3 to 4 bytes */
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entry[0x18] = 0;
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/* Move file type to allow for next step below */
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entry[0x19] = entry[0x10];
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/* Zero-terminate file name */
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entry[0x01 + (entry[0x00] & 0x0F)] = 0;
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/* Return success */
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return (struct dirent*)&entry[0x01];
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}
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