Platform library for iconv.h on macos, ios and linux.

backend.native/tests/build.gradle

@@ -2562,6 +2562,12 @@ task jsinterop_math(type: RunStandaloneKonanTest) {
     flags = ["-r", "$buildDir", "-l", "jsmath"]
 }
 
+task interop_libiconv(type: RunStandaloneKonanTest) {
+    disabled = (isWindows() || (project.testTarget != null))
+    source = "interop/libiconv.kt"
+    goldValue = "72 72\n101 101\n108 108\n108 108\n111 111\n33 33\n"
+}
+
 task produce_dynamic(type: DynamicKonanTest) {
     disabled = (project.testTarget != null && project.testTarget != project.hostName)
     source = "produce_dynamic/simple/hello.kt"

backend.native/tests/interop/libiconv.kt

@@ -0,0 +1,39 @@
+import kotlinx.cinterop.*
+import platform.iconv.*
+import platform.posix.size_tVar
+
+fun main(args: Array<String>) {
+
+    val sourceByteArray = "Hello!".toUtf8()
+
+    val golden = listOf(0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x21)
+
+    memScoped {
+
+        val sourceLength = alloc<size_tVar>()
+        val destLength = alloc<size_tVar>()
+
+        val sourceBytes = allocArrayOf(sourceByteArray)
+        val destBytes = allocArray<ByteVar>(golden.size)
+
+        val sourcePtr = alloc<CArrayPointerVar<ByteVar>>()
+        sourcePtr.value = sourceBytes
+
+        val destPtr = alloc<CArrayPointerVar<ByteVar>>()
+        destPtr.value = destBytes
+
+        sourceLength.value = sourceByteArray.size.signExtend();
+        destLength.value = golden.size.signExtend();
+
+        val conversion = iconv_open("UTF-8", "LATIN1")
+
+        iconv(conversion, sourcePtr.ptr, sourceLength.ptr, destPtr.ptr, destLength.ptr)
+
+        golden.forEachIndexed { index, it ->
+            println("$it ${destBytes[index]}")
+            it == destBytes[index].toInt()
+        }
+
+        iconv_close(conversion)
+    }
+}

platformLibs/src/platform/ios/iconv.def

@@ -0,0 +1,4 @@
+depends = posix
+package = platform.iconv
+headers = iconv.h
+linkerOpts = -liconv

platformLibs/src/platform/linux/iconv.def

@@ -0,0 +1,3 @@
+depends = posix
+package = platform.iconv
+headers = iconv.h

platformLibs/src/platform/linux/linux.def

@@ -3,7 +3,7 @@ headers = aio.h aliases.h a.out.h argp.h argz.h byteswap.h cpio.h crypt.h \
 	ctype.h elf.h endian.h envz.h error.h execinfo.h features.h fmtmsg.h \
 	fpu_control.h \
 	fstab.h _G_config.h gconv.h glob.h gnu-versions.h \
-	gshadow.h iconv.h ieee754.h ifaddrs.h langinfo.h lastlog.h \
+	gshadow.h ieee754.h ifaddrs.h langinfo.h lastlog.h \
 	libintl.h libio.h link.h malloc.h mcheck.h mntent.h \
 	monetary.h mqueue.h \
 	nl_types.h nss.h obstack.h \

platformLibs/src/platform/osx/iconv.def

@@ -0,0 +1,4 @@
+depends = posix
+package = platform.iconv
+headers = iconv.h
+linkerOpts = -liconv