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https://github.com/cc65/cc65.git
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113 lines
4.2 KiB
C
113 lines
4.2 KiB
C
/*****************************************************************************/
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/* */
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/* opendir.h */
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/* */
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/* Open a directory */
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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 <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <dirent.h>
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#include "dir.h"
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/*****************************************************************************/
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/* Data */
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/*****************************************************************************/
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extern char _cwd[FILENAME_MAX];
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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DIR* __fastcall__ opendir (register const char* name)
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{
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register DIR* dir;
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/* Alloc DIR */
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if ((dir = malloc (sizeof (*dir))) == NULL) {
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/* May not have been done by malloc() */
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_directerrno (ENOMEM);
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/* Return failure */
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return NULL;
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}
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/* Interpret dot as current working directory */
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if (*name == '.') {
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name = _cwd;
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}
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/* Open directory file */
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if ((dir->fd = open (name, O_RDONLY)) != -1) {
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/* Read directory key 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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/* Get directory entry infos from directory header */
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dir->entry_length = dir->block.bytes[0x23];
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dir->entries_per_block = dir->block.bytes[0x24];
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/* Skip directory header entry */
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dir->current_entry = 1;
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/* Return success */
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return dir;
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}
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/* EOF: Most probably no directory file at all */
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if (_oserror == 0) {
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_directerrno (EINVAL);
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}
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/* Cleanup directory file */
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close (dir->fd);
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}
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/* Cleanup DIR */
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free (dir);
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/* Return failure */
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return NULL;
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}
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