feat(cpp/inih): add inih parser_1

cpp/inih/_demo/inihdemo/ReaderDemo.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"github.com/goplus/llgo/c"
+	"github.com/goplus/llgoexamples/cpp/inih"
+)
+
+/*
+	expected output:
+	section: owner name: name value: John Doe
+	section: owner name: organization value: Acme Widgets Inc.
+	section: database name: server value: 192.0.2.62
+	section: database name: port value: 143
+	section: database name: file value: "payroll.dat"
+	section: database name: enabled value: true
+	section: owner name: name value: John Doe
+	section: owner name: organization value: Acme Widgets Inc.
+	section: database name: server value: 192.0.2.62
+	section: database name: port value: 143
+	section: database name: file value: "payroll.dat"
+	section: database name: enabled value: true
+	section: settings name: username value: lee
+	section: settings name: timeout value: 20
+	Config file parsed successfully
+	isDatabaseEnabled: true port: 143
+	0x10e2c8e20
+	0
+	value: 100
+
+*/
+
+func main() {
+	demo1()
+	reader := inih.NewReaderFile(inih.Str("config.ini"))
+	if reader.ParseError() != 0 {
+		println("Error parsing config file")
+		return
+	}
+	isDatabaseEnabled := reader.GetBoolean(inih.Str("database"), inih.Str("enabled"), false)
+	port := reader.GetInteger(inih.Str("database"), inih.Str("port"), 0)
+	println("isDatabaseEnabled:", isDatabaseEnabled, "port:", port)
+	demo2()
+
+}
+
+func demo2() {
+	buf := `[settings]
+username=admin
+timeout=100
+`
+	reader := inih.NewReader(c.Str(buf), c.Ulong(len(buf)))
+
+	println(&reader)
+	println(reader.ParseError())
+	sec := inih.Str("settings")
+	name := inih.Str("timeout")
+	value := reader.GetInteger(sec, name, 0)
+	println("value:", value)
+}