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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Chunk I/O
* =========
* Copyright 2018-2019 Eduardo Silva <eduardo@monkey.io>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* This module implements <dirent.h> emulation layer based on
* Win32's FIndFirstFile/FindNextFile API.
*/
#include <Windows.h>
#include <shlwapi.h>
#include "dirent.h"
struct CIO_WIN32_DIR {
HANDLE h;
char *pattern;
int count;
WIN32_FIND_DATA find_data;
struct cio_win32_dirent dir;
};
/*
* Guess POSIX flle type from Win32 file attributes.
*/
static unsigned char get_filetype(int dwFileAttributes)
{
if (dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
return DT_DIR;
}
else if (dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
return DT_LNK;
}
return DT_REG;
}
/*
* Construct a match pattern (e.g. 'c:\var\data\*')
*/
static char *create_pattern(const char *path)
{
char *buf;
size_t len = strlen(path);
size_t buflen = len + 3;
buf = malloc(buflen);
if (buf == NULL) {
return NULL;
}
strcpy_s(buf, buflen, path);
if (path[len - 1] == '\\') {
strcat_s(buf, buflen, "*");
}
else {
strcat_s(buf, buflen, "\\*");
}
return buf;
}
struct CIO_WIN32_DIR *cio_win32_opendir(const char *path)
{
struct CIO_WIN32_DIR *d;
if (!PathIsDirectoryA(path)) {
return NULL;
}
d = calloc(1, sizeof(struct CIO_WIN32_DIR));
if (d == NULL) {
return NULL;
}
d->pattern = create_pattern(path);
if (d->pattern == NULL) {
free(d);
return NULL;
}
d->h = FindFirstFileA(d->pattern, &d->find_data);
if (d->h == INVALID_HANDLE_VALUE) {
return d;
}
return d;
}
struct cio_win32_dirent *cio_win32_readdir(struct CIO_WIN32_DIR *d)
{
if (d->h == INVALID_HANDLE_VALUE) {
return NULL;
}
/*
* The initial entry should be retrieved by FindFirstFile(),
* so we can skip FindNextFile() on the first call.
*/
if (d->count > 0) {
if (FindNextFile(d->h, &d->find_data) == 0) {
return NULL;
}
}
d->count++;
d->dir.d_name = d->find_data.cFileName;
d->dir.d_type = get_filetype(d->find_data.dwFileAttributes);
return &d->dir;
}
int cio_win32_closedir(struct CIO_WIN32_DIR *d)
{
if (d->h != INVALID_HANDLE_VALUE) {
FindClose(d->h);
}
free(d->pattern);
free(d);
return 0;
}
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