mirror of
https://github.com/cc65/cc65.git
synced 2024-12-23 19:29:37 +00:00
91 lines
3.9 KiB
C
91 lines
3.9 KiB
C
/*****************************************************************************/
|
|
/* */
|
|
/* readdir.c */
|
|
/* */
|
|
/* Read directory entry */
|
|
/* */
|
|
/* */
|
|
/* */
|
|
/* (C) 2005 Oliver Schmidt, <ol.sc@web.de> */
|
|
/* */
|
|
/* */
|
|
/* This software is provided 'as-is', without any expressed or implied */
|
|
/* warranty. In no event will the authors be held liable for any damages */
|
|
/* arising from the use of this software. */
|
|
/* */
|
|
/* Permission is granted to anyone to use this software for any purpose, */
|
|
/* including commercial applications, and to alter it and redistribute it */
|
|
/* freely, subject to the following restrictions: */
|
|
/* */
|
|
/* 1. The origin of this software must not be misrepresented; you must not */
|
|
/* claim that you wrote the original software. If you use this software */
|
|
/* in a product, an acknowledgment in the product documentation would be */
|
|
/* appreciated but is not required. */
|
|
/* 2. Altered source versions must be plainly marked as such, and must not */
|
|
/* be misrepresented as being the original software. */
|
|
/* 3. This notice may not be removed or altered from any source */
|
|
/* distribution. */
|
|
/* */
|
|
/*****************************************************************************/
|
|
|
|
|
|
|
|
#include <stddef.h>
|
|
#include <unistd.h>
|
|
#include <dirent.h>
|
|
#include "dir.h"
|
|
|
|
|
|
|
|
/*****************************************************************************/
|
|
/* Code */
|
|
/*****************************************************************************/
|
|
|
|
|
|
|
|
struct dirent* __fastcall__ readdir (register DIR* dir)
|
|
{
|
|
register unsigned char* entry;
|
|
|
|
/* Search for the next active directory entry */
|
|
do {
|
|
|
|
/* Read next directory block if necessary */
|
|
if (dir->current_entry == dir->entries_per_block) {
|
|
if (read (dir->fd,
|
|
dir->block.bytes,
|
|
sizeof (dir->block)) != sizeof (dir->block)) {
|
|
|
|
/* Just return failure as read() has */
|
|
/* set errno if (and only if) no EOF */
|
|
return NULL;
|
|
}
|
|
|
|
/* Start with first entry in next block */
|
|
dir->current_entry = 0;
|
|
}
|
|
|
|
/* Compute pointer to current entry */
|
|
entry = dir->block.content.entries +
|
|
dir->current_entry * dir->entry_length;
|
|
|
|
/* Switch to next entry */
|
|
++dir->current_entry;
|
|
} while (entry[0x00] == 0);
|
|
|
|
/* Move creation date/time to allow for next step below */
|
|
*(unsigned long*)&entry[0x1A] = *(unsigned long*)&entry[0x18];
|
|
|
|
/* Feature unsigned long access to EOF by extension from 3 to 4 bytes */
|
|
entry[0x18] = 0;
|
|
|
|
/* Move file type to allow for next step below */
|
|
entry[0x19] = entry[0x10];
|
|
|
|
/* Zero-terminate file name */
|
|
entry[0x01 + (entry[0x00] & 0x0F)] = 0;
|
|
|
|
/* Return success */
|
|
return (struct dirent*)&entry[0x01];
|
|
}
|