unistd: add getcwd

Signed-off-by: Simon Rozman <simon@rozman.si>

MacStd.xcodeproj/project.pbxproj

@@ -7,6 +7,7 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		F439D28E2ABA7DCC00B92CAE /* unistd.hpp in Headers */ = {isa = PBXBuildFile; fileRef = F439D28D2ABA7DCC00B92CAE /* unistd.hpp */; };
 		F4AE3B802AB440A000464926 /* dyld.hpp in Headers */ = {isa = PBXBuildFile; fileRef = F4AE3B7E2AB440A000464926 /* dyld.hpp */; };
 		F4AE3B812AB440A000464926 /* common.hpp in Headers */ = {isa = PBXBuildFile; fileRef = F4AE3B7F2AB440A000464926 /* common.hpp */; };
 		F4AE3BA22AB44AC500464926 /* Tests.mm in Sources */ = {isa = PBXBuildFile; fileRef = F4AE3BA12AB44AC400464926 /* Tests.mm */; };
@@ -26,6 +27,7 @@
 /* End PBXContainerItemProxy section */
 
 /* Begin PBXFileReference section */
+		F439D28D2ABA7DCC00B92CAE /* unistd.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = unistd.hpp; path = include/MacStd/unistd.hpp; sourceTree = "<group>"; };
 		F4AE3B732AB43EB600464926 /* libMacStd.a */ = {isa = PBXFileReference; explicitFileType = archive.ar; includeInIndex = 0; path = libMacStd.a; sourceTree = BUILT_PRODUCTS_DIR; };
 		F4AE3B7E2AB440A000464926 /* dyld.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = dyld.hpp; path = include/MacStd/dyld.hpp; sourceTree = "<group>"; };
 		F4AE3B7F2AB440A000464926 /* common.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = common.hpp; path = include/MacStd/common.hpp; sourceTree = "<group>"; };
@@ -63,6 +65,7 @@
 				F4AE3BCF2AB4561A00464926 /* pch.hpp */,
 				F4AE3B742AB43EB600464926 /* Products */,
 				F4AE3BA02AB44AC400464926 /* Tests */,
+				F439D28D2ABA7DCC00B92CAE /* unistd.hpp */,
 			);
 			sourceTree = "<group>";
 		};
@@ -93,6 +96,7 @@
 				F4AE3BD12AB4561A00464926 /* pch.hpp in Headers */,
 				F4AE3B802AB440A000464926 /* dyld.hpp in Headers */,
 				F4AE3B812AB440A000464926 /* common.hpp in Headers */,
+				F439D28E2ABA7DCC00B92CAE /* unistd.hpp in Headers */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -347,7 +351,7 @@
 				CURRENT_PROJECT_VERSION = 1;
 				GENERATE_INFOPLIST_FILE = YES;
 				IPHONEOS_DEPLOYMENT_TARGET = 16.4;
-				MACOSX_DEPLOYMENT_TARGET = 13.3;
+				MACOSX_DEPLOYMENT_TARGET = 10.15;
 				MARKETING_VERSION = 1.0;
 				PRODUCT_BUNDLE_IDENTIFIER = si.amebis.MacStd.Tests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -365,7 +369,7 @@
 				CURRENT_PROJECT_VERSION = 1;
 				GENERATE_INFOPLIST_FILE = YES;
 				IPHONEOS_DEPLOYMENT_TARGET = 16.4;
-				MACOSX_DEPLOYMENT_TARGET = 13.3;
+				MACOSX_DEPLOYMENT_TARGET = 10.15;
 				MARKETING_VERSION = 1.0;
 				PRODUCT_BUNDLE_IDENTIFIER = si.amebis.MacStd.Tests;
 				PRODUCT_NAME = "$(TARGET_NAME)";

Tests/Tests.mm

@@ -5,6 +5,7 @@
 
 #import <XCTest/XCTest.h>
 #include "../include/MacStd/dyld.hpp"
+#include "../include/MacStd/unistd.hpp"
 
 @interface Tests : XCTestCase
 @end
@@ -24,6 +25,11 @@
 	XCTAssert(_NSGetExecutablePath(path) == 0);
 }
 
+- (void)test_getcwd {
+	std::string path;
+	XCTAssert(getcwd(path));
+}
+
 - (void)testPerformanceExample {
 	// This is an example of a performance test case.
 	[self measureBlock:^{

include/MacStd/unistd.hpp

@@ -0,0 +1,34 @@
+/*
+	SPDX-License-Identifier: MIT
+	Copyright © 2023 Amebis
+*/
+
+#pragma once
+
+#include "common.hpp"
+#include <unistd.h>
+#include <string>
+
+///
+/// Copies the absolute pathname of the current working directory
+///
+/// \sa [getcwd function](https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/getcwd.3.html)
+///
+inline const char* getcwd(std::string& path)
+{
+	char stack_buffer[MACSTD_STACK_BUFFER_BYTES];
+	auto result = getcwd(stack_buffer, MACSTD_STACK_BUFFER_BYTES);
+	if (result) {
+		path = result;
+		return path.data();
+	}
+	if (errno == ERANGE) {
+		result = getcwd(NULL, 0);
+		if (result) {
+			path = result;
+			free(result);
+			return path.data();
+		}
+	}
+	return NULL;
+}

src/pch.hpp

@@ -6,3 +6,4 @@
 #pragma once
 
 #include "../include/MacStd/dyld.hpp"
+#include "../include/MacStd/unistd.hpp"