feat(cpp/inih): add inih parser_2

cpp/inih/_demo/inihdemo/ReaderDemo.go

@@ -2,7 +2,7 @@ package main
 
 import (
 	"github.com/goplus/llgo/c"
-	"github.com/goplus/llgoexamples/cpp/inih"
+	"github.com/goplus/llgo/cpp/inih"
 )
 
 /*
@@ -38,6 +38,8 @@ func main() {
 	}
 	isDatabaseEnabled := reader.GetBoolean(inih.Str("database"), inih.Str("enabled"), false)
 	port := reader.GetInteger(inih.Str("database"), inih.Str("port"), 0)
+	s := reader.GetString(inih.Str("database"), inih.Str("server"), inih.Str("unknown")).String()
+	println("s :", s)
 	println("isDatabaseEnabled:", isDatabaseEnabled, "port:", port)
 	demo2()
 

cpp/inih/_demo/inihdemo/inihdemo.go

@@ -2,7 +2,7 @@ package main
 
 import (
 	"github.com/goplus/llgo/c"
-	"github.com/goplus/llgo/c/inih"
+	"github.com/goplus/llgo/cpp/inih"
 )
 
 func demo1() {

cpp/inih/inihReader.go

@@ -1,7 +1,7 @@
 package inih
 
 import (
-	_ "unsafe"
+	"unsafe"
 
 	"github.com/goplus/llgo/c"
 )
@@ -11,34 +11,59 @@ type Reader struct {
 	Unused [24]byte
 }
 
-func Str(s string) *stdstring {
-	var r stdstring
+type StdString struct {
+	buf [24]byte
+}
+
+type stringHead struct {
+	data unsafe.Pointer
+	size int
+}
+
+type __long struct {
+	__cap_  int
+	__size_ int
+	__data_ unsafe.Pointer
+}
+
+func Str(s string) *StdString {
+	var r StdString
 	r.init(c.GoStringData(s), c.Int(len(s)))
 	return &r
 }
 
-type stdstring struct {
-	buf [24]byte
+func (r *StdString) String() string {
+	if r.buf[0]&1 == 0 {
+		return c.GoString((*c.Char)(unsafe.Pointer(&r.buf[1])))
+	} else {
+		v := *(*__long)(unsafe.Pointer(&r.buf[0]))
+		return *(*string)(unsafe.Pointer(&stringHead{data: v.__data_, size: v.__size_}))
+	}
 }
 
-// llgo:link (*stdstring).init C._ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE6__initEPKcm
-func (*stdstring) init(s *c.Char, size c.Int) {}
+// llgo:link (*StdString).init C._ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE6__initEPKcm
+func (*StdString) init(s *c.Char, size c.Int) {}
 
 //go:linkname NewReader C._ZN9INIReaderC1EPKcm
 func NewReader(fileName *c.Char, size c.Ulong) Reader
 
 //go:linkname NewReaderFile C._ZN9INIReaderC1ERKNSt3__112basic_stringIcNS0_11char_traitsIcEENS0_9allocatorIcEEEE
-func NewReaderFile(fileName *stdstring) Reader
+func NewReaderFile(fileName *StdString) Reader
 
 // llgo:link (*Reader).ParseError C._ZNK9INIReader10ParseErrorEv
 func (*Reader) ParseError() c.Int { return 0 }
 
 // llgo:link (*Reader).GetInteger C._ZNK9INIReader10GetIntegerERKNSt3__112basic_stringIcNS0_11char_traitsIcEENS0_9allocatorIcEEEES8_l
-func (*Reader) GetInteger(section *stdstring, name *stdstring, defaultValue c.Long) c.Long {
+func (*Reader) GetInteger(section *StdString, name *StdString, defaultValue c.Long) c.Long {
 	return 0
 }
 
 // llgo:link (*Reader).GetBoolean C._ZNK9INIReader10GetBooleanERKNSt3__112basic_stringIcNS0_11char_traitsIcEENS0_9allocatorIcEEEES8_b
-func (*Reader) GetBoolean(section *stdstring, name *stdstring, defaultValue bool) bool {
+func (*Reader) GetBoolean(section *StdString, name *StdString, defaultValue bool) bool {
 	return false
 }
+
+// llgo:link (*Reader).GetString C._ZNK9INIReader9GetStringERKNSt3__112basic_stringIcNS0_11char_traitsIcEENS0_9allocatorIcEEEES8_S8_
+func (*Reader) GetString(section *StdString, name *StdString, defaultValue *StdString) *StdString {
+	return &StdString{}
+}