From 41a8b75cd086d4d688a73778a4db0bd025965332 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Mon, 30 Aug 2021 02:38:46 +0300
Subject: [PATCH] Add platform-specific implemenrations of FS::list_filtered

Microsoft's stdlib does not have opendir and friends.
---
 source/fs/dir.cpp         | 25 -------------------------
 source/fs/unix/dir.cpp    | 24 ++++++++++++++++++++++++
 source/fs/windows/dir.cpp | 35 +++++++++++++++++++++++++++++++++++
 3 files changed, 59 insertions(+), 25 deletions(-)

diff --git a/source/fs/dir.cpp b/source/fs/dir.cpp
index 218a7a5..066d88b 100644
--- a/source/fs/dir.cpp
+++ b/source/fs/dir.cpp
@@ -1,8 +1,5 @@
-#include <dirent.h>
 #include <msp/core/application.h>
 #include <msp/core/environ.h>
-#include <msp/core/systemerror.h>
-#include <msp/strings/regex.h>
 #include <msp/strings/utils.h>
 #include "dir.h"
 #include "path.h"
@@ -108,28 +105,6 @@ vector<string> list_files(const Path &path)
 	return list_filtered(path, string());
 }
 
-vector<string> list_filtered(const Path &path, const string &filter)
-{
-	Regex r_filter(filter);
-
-	vector<string> result;
-	DIR *dir = opendir(path.str().c_str());
-	if(!dir)
-		throw system_error("opendir");
-
-	while(dirent *de = readdir(dir))
-	{
-		const char *fn = de->d_name;
-		if(fn[0]=='.' && (fn[1]==0 || (fn[1]=='.' && fn[2]==0))) 
-			continue;
-		if(r_filter.match(fn))
-			result.push_back(fn);
-	}
-	closedir(dir);
-
-	return result;
-}
-
 Path get_sys_conf_dir()
 {
 	const char *argv0 = Application::get_argv0();
diff --git a/source/fs/unix/dir.cpp b/source/fs/unix/dir.cpp
index 0dc950b..a13cbbb 100644
--- a/source/fs/unix/dir.cpp
+++ b/source/fs/unix/dir.cpp
@@ -1,6 +1,8 @@
 #include <unistd.h>
+#include <dirent.h>
 #include <sys/stat.h>
 #include <msp/core/systemerror.h>
+#include <msp/strings/regex.h>
 #include "dir.h"
 
 using namespace std;
@@ -20,6 +22,28 @@ void rmdir(const Path &path)
 		throw system_error("rmdir");
 }
 
+vector<string> list_filtered(const Path &path, const string &filter)
+{
+	Regex r_filter(filter);
+
+	vector<string> result;
+	DIR *dir = opendir(path.str().c_str());
+	if(!dir)
+		throw system_error("opendir");
+
+	while(dirent *de = readdir(dir))
+	{
+		const char *fn = de->d_name;
+		if(fn[0]=='.' && (fn[1]==0 || (fn[1]=='.' && fn[2]==0)))
+			continue;
+		if(r_filter.match(fn))
+			result.push_back(fn);
+	}
+	closedir(dir);
+
+	return result;
+}
+
 Path getcwd()
 {
 	char buf[1024];
diff --git a/source/fs/windows/dir.cpp b/source/fs/windows/dir.cpp
index 3d2bf6e..c6f6b9b 100644
--- a/source/fs/windows/dir.cpp
+++ b/source/fs/windows/dir.cpp
@@ -1,6 +1,7 @@
 #include <windows.h>
 #include <msp/core/mutex.h>
 #include <msp/core/systemerror.h>
+#include <msp/strings/regex.h>
 #include "dir.h"
 
 using namespace std;
@@ -20,6 +21,40 @@ void rmdir(const Path &path)
 		throw system_error("RemoveDirectory");
 }
 
+vector<string> list_filtered(const Path &path, const string &filter)
+{
+	Regex r_filter(filter);
+
+	vector<string> result;
+	WIN32_FIND_DATA entry;
+	string pattern = path.str()+"\\*";
+	HANDLE search_handle = FindFirstFileEx(pattern.c_str(), FindExInfoBasic, &entry, FindExSearchNameMatch, 0, 0);
+	if(search_handle==INVALID_HANDLE_VALUE)
+	{
+		DWORD err = GetLastError();
+		if(err==ERROR_FILE_NOT_FOUND)
+			return result;
+		throw system_error("FindFirstFileEx");
+	}
+
+	bool more = true;
+	for(; more; more=FindNextFile(search_handle, &entry))
+	{
+		const char *fn = entry.cFileName;
+		if(fn[0]=='.' && (fn[1]==0 || (fn[1]=='.' && fn[2]==0)))
+			continue;
+		if(r_filter.match(fn))
+			result.push_back(fn);
+	}
+
+	DWORD err = GetLastError();
+	FindClose(search_handle);
+	if(err!=ERROR_NO_MORE_FILES)
+		throw system_error("FindNextFile");
+
+	return result;
+}
+
 /* Windows documentation says Get/SetCurrentDirectory use a global buffer and
 are not thread safe. */
 static Mutex &cwd_mutex()
-- 
2.43.0