1160814Ssimon/* $LP: LPlib/source/LPdir_unix.c,v 1.11 2004/09/23 22:07:22 _cvs_levitte Exp $ */ 2160814Ssimon/* 3160814Ssimon * Copyright (c) 2004, Richard Levitte <richard@levitte.org> 4160814Ssimon * All rights reserved. 5160814Ssimon * 6160814Ssimon * Redistribution and use in source and binary forms, with or without 7160814Ssimon * modification, are permitted provided that the following conditions 8160814Ssimon * are met: 9160814Ssimon * 1. Redistributions of source code must retain the above copyright 10160814Ssimon * notice, this list of conditions and the following disclaimer. 11160814Ssimon * 2. Redistributions in binary form must reproduce the above copyright 12160814Ssimon * notice, this list of conditions and the following disclaimer in the 13160814Ssimon * documentation and/or other materials provided with the distribution. 14160814Ssimon * 15160814Ssimon * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16160814Ssimon * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17160814Ssimon * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 18160814Ssimon * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 19160814Ssimon * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20160814Ssimon * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 21160814Ssimon * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22160814Ssimon * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23160814Ssimon * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24160814Ssimon * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25160814Ssimon * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26160814Ssimon */ 27160814Ssimon 28160814Ssimon#include <stddef.h> 29160814Ssimon#include <stdlib.h> 30160814Ssimon#include <limits.h> 31160814Ssimon#include <string.h> 32160814Ssimon#include <sys/types.h> 33160814Ssimon#include <dirent.h> 34160814Ssimon#include <errno.h> 35160814Ssimon#ifndef LPDIR_H 36160814Ssimon#include "LPdir.h" 37160814Ssimon#endif 38160814Ssimon 39160814Ssimon/* The POSIXly macro for the maximum number of characters in a file path 40160814Ssimon is NAME_MAX. However, some operating systems use PATH_MAX instead. 41160814Ssimon Therefore, it seems natural to first check for PATH_MAX and use that, 42160814Ssimon and if it doesn't exist, use NAME_MAX. */ 43160814Ssimon#if defined(PATH_MAX) 44160814Ssimon# define LP_ENTRY_SIZE PATH_MAX 45160814Ssimon#elif defined(NAME_MAX) 46160814Ssimon# define LP_ENTRY_SIZE NAME_MAX 47160814Ssimon#endif 48160814Ssimon 49160814Ssimon/* Of course, there's the possibility that neither PATH_MAX nor NAME_MAX 50160814Ssimon exist. It's also possible that NAME_MAX exists but is define to a 51160814Ssimon very small value (HP-UX offers 14), so we need to check if we got a 52160814Ssimon result, and if it meets a minimum standard, and create or change it 53160814Ssimon if not. */ 54160814Ssimon#if !defined(LP_ENTRY_SIZE) || LP_ENTRY_SIZE<255 55160814Ssimon# undef LP_ENTRY_SIZE 56160814Ssimon# define LP_ENTRY_SIZE 255 57160814Ssimon#endif 58160814Ssimon 59160814Ssimonstruct LP_dir_context_st 60160814Ssimon{ 61160814Ssimon DIR *dir; 62160814Ssimon char entry_name[LP_ENTRY_SIZE+1]; 63160814Ssimon}; 64160814Ssimon 65160814Ssimonconst char *LP_find_file(LP_DIR_CTX **ctx, const char *directory) 66160814Ssimon{ 67160814Ssimon struct dirent *direntry = NULL; 68160814Ssimon 69160814Ssimon if (ctx == NULL || directory == NULL) 70160814Ssimon { 71160814Ssimon errno = EINVAL; 72160814Ssimon return 0; 73160814Ssimon } 74160814Ssimon 75160814Ssimon errno = 0; 76160814Ssimon if (*ctx == NULL) 77160814Ssimon { 78160814Ssimon *ctx = (LP_DIR_CTX *)malloc(sizeof(LP_DIR_CTX)); 79160814Ssimon if (*ctx == NULL) 80160814Ssimon { 81160814Ssimon errno = ENOMEM; 82160814Ssimon return 0; 83160814Ssimon } 84160814Ssimon memset(*ctx, '\0', sizeof(LP_DIR_CTX)); 85160814Ssimon 86160814Ssimon (*ctx)->dir = opendir(directory); 87160814Ssimon if ((*ctx)->dir == NULL) 88160814Ssimon { 89160814Ssimon int save_errno = errno; /* Probably not needed, but I'm paranoid */ 90160814Ssimon free(*ctx); 91160814Ssimon *ctx = NULL; 92160814Ssimon errno = save_errno; 93160814Ssimon return 0; 94160814Ssimon } 95160814Ssimon } 96160814Ssimon 97160814Ssimon direntry = readdir((*ctx)->dir); 98160814Ssimon if (direntry == NULL) 99160814Ssimon { 100160814Ssimon return 0; 101160814Ssimon } 102160814Ssimon 103160814Ssimon strncpy((*ctx)->entry_name, direntry->d_name, sizeof((*ctx)->entry_name) - 1); 104160814Ssimon (*ctx)->entry_name[sizeof((*ctx)->entry_name) - 1] = '\0'; 105160814Ssimon return (*ctx)->entry_name; 106160814Ssimon} 107160814Ssimon 108160814Ssimonint LP_find_file_end(LP_DIR_CTX **ctx) 109160814Ssimon{ 110160814Ssimon if (ctx != NULL && *ctx != NULL) 111160814Ssimon { 112160814Ssimon int ret = closedir((*ctx)->dir); 113160814Ssimon 114160814Ssimon free(*ctx); 115160814Ssimon switch (ret) 116160814Ssimon { 117160814Ssimon case 0: 118160814Ssimon return 1; 119160814Ssimon case -1: 120160814Ssimon return 0; 121160814Ssimon default: 122160814Ssimon break; 123160814Ssimon } 124160814Ssimon } 125160814Ssimon errno = EINVAL; 126160814Ssimon return 0; 127160814Ssimon} 128