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/* $LP: LPlib/source/LPdir_unix.c,v 1.11 2004/09/23 22:07:22 _cvs_levitte Exp $ */
/*
* Copyright (c) 2004, Richard Levitte <richard@levitte.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stddef.h>
#include <stdlib.h>
#include <limits.h>
#include <string.h>
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#ifndef LPDIR_H
#include "LPdir.h"
#endif
/* The POSIXly macro for the maximum number of characters in a file path
is NAME_MAX. However, some operating systems use PATH_MAX instead.
Therefore, it seems natural to first check for PATH_MAX and use that,
and if it doesn't exist, use NAME_MAX. */
#if defined(PATH_MAX)
# define LP_ENTRY_SIZE PATH_MAX
#elif defined(NAME_MAX)
# define LP_ENTRY_SIZE NAME_MAX
#endif
/* Of course, there's the possibility that neither PATH_MAX nor NAME_MAX
exist. It's also possible that NAME_MAX exists but is define to a
very small value (HP-UX offers 14), so we need to check if we got a
result, and if it meets a minimum standard, and create or change it
if not. */
#if !defined(LP_ENTRY_SIZE) || LP_ENTRY_SIZE<255
# undef LP_ENTRY_SIZE
# define LP_ENTRY_SIZE 255
#endif
struct LP_dir_context_st
{
DIR *dir;
char entry_name[LP_ENTRY_SIZE+1];
};
const char *LP_find_file(LP_DIR_CTX **ctx, const char *directory)
{
struct dirent *direntry = NULL;
if (ctx == NULL || directory == NULL)
{
errno = EINVAL;
return 0;
}
errno = 0;
if (*ctx == NULL)
{
*ctx = (LP_DIR_CTX *)malloc(sizeof(LP_DIR_CTX));
if (*ctx == NULL)
{
errno = ENOMEM;
return 0;
}
memset(*ctx, '\0', sizeof(LP_DIR_CTX));
(*ctx)->dir = opendir(directory);
if ((*ctx)->dir == NULL)
{
int save_errno = errno; /* Probably not needed, but I'm paranoid */
free(*ctx);
*ctx = NULL;
errno = save_errno;
return 0;
}
}
direntry = readdir((*ctx)->dir);
if (direntry == NULL)
{
return 0;
}
strncpy((*ctx)->entry_name, direntry->d_name, sizeof((*ctx)->entry_name) - 1);
(*ctx)->entry_name[sizeof((*ctx)->entry_name) - 1] = '\0';
return (*ctx)->entry_name;
}
int LP_find_file_end(LP_DIR_CTX **ctx)
{
if (ctx != NULL && *ctx != NULL)
{
int ret = closedir((*ctx)->dir);
free(*ctx);
switch (ret)
{
case 0:
return 1;
case -1:
return 0;
default:
break;
}
}
errno = EINVAL;
return 0;
}