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