feat(llgo/c):Add an INI parser (#466)

* feat(llgo/c):Add an INI parser

c/inih/_demo/config.ini

@@ -0,0 +1,3 @@
+[settings]
+username=admin
+timeout=30

c/inih/_demo/inihHello.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"github.com/goplus/llgo/c"
+	"github.com/goplus/llgo/c/inih"
+)
+
+func main() {
+	filename := c.Str("config.ini")
+
+	if inih.Parse(filename, func(user c.Pointer, section *c.Char, name *c.Char, value *c.Char) c.Int {
+		println("section:", c.GoString(section), "name:", c.GoString(name), "value:", c.GoString(value))
+		return 1
+	}, nil) < 0 {
+		println("Error parsing config file")
+		return
+	}
+
+	file := c.Fopen(c.Str("config.ini"), c.Str("r"))
+	if file == nil {
+		println("Error opening config file")
+		return
+	} else {
+		if inih.ParseFile(file, func(user c.Pointer, section *c.Char, name *c.Char, value *c.Char) c.Int {
+			println("section:", c.GoString(section), "name:", c.GoString(name), "value:", c.GoString(value))
+			return 1
+		}, nil) < 0 {
+			println("Error parsing config file")
+			return
+		}
+		c.Fclose(file)
+	}
+
+	configData := "[settings]\nusername=lee\ntimeout=20"
+	if inih.ParseString(c.Str(configData), func(user c.Pointer, section *c.Char, name *c.Char, value *c.Char) c.Int {
+		println("section:", c.GoString(section), "name:", c.GoString(name), "value:", c.GoString(value))
+		return 1
+	}, nil) < 0 {
+		println("Error parsing config file")
+		return
+	} else {
+		println("Config file parsed successfully")
+	}
+
+}

c/inih/inih.go

@@ -0,0 +1,24 @@
+package inih
+
+/*
+#include <stdio.h>
+#include <stdlib.h>
+*/
+import (
+	_ "unsafe"
+
+	"github.com/goplus/llgo/c"
+)
+
+const (
+	LLGoPackage = "link: $(pkg-config --libs inih); -linih"
+)
+
+//go:linkname Parse C.ini_parse
+func Parse(filename *c.Char, handler func(user c.Pointer, section *c.Char, name *c.Char, value *c.Char) c.Int, user c.Pointer) c.Int
+
+//go:linkname ParseFile C.ini_parse_file
+func ParseFile(file c.FilePtr, handler func(user c.Pointer, section *c.Char, name *c.Char, value *c.Char) c.Int, user c.Pointer) c.Int
+
+//go:linkname ParseString C.ini_parse_string
+func ParseString(str *c.Char, handler func(user c.Pointer, section *c.Char, name *c.Char, value *c.Char) c.Int, user c.Pointer) c.Int