// +build !darwin

// Copied from https://github.com/amoghe/go-crypt/blob/b3e291286513a0c993f7c4dd7060d327d2d56143/crypt_r.go

// Original sources are under MIT license:

// The MIT License (MIT)

//

// Copyright (c) 2015 Akshay Moghe

//

// Permission is hereby granted, free of charge, to any person obtaining a copy

// of this software and associated documentation files (the "Software"), to deal

// in the Software without restriction, including without limitation the rights

// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

// copies of the Software, and to permit persons to whom the Software is

// furnished to do so, subject to the following conditions:

//

// The above copyright notice and this permission notice shall be included in all

// copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

// SOFTWARE.

//

// Package crypt provides wrappers around functions available in crypt.h

//

// It wraps around the GNU specific extension (crypt_r) when it is available

// (i.e. where GOOS=linux). This makes the go function reentrant (and thus

// callable from concurrent goroutines).

package crypt

import (

	"unsafe"

)

/*

	#cgo LDFLAGS: -lcrypt

	// this is needed for Ubuntu

	#define _GNU_SOURCE

	#include <stdlib.h>

	#include <string.h>

	#include <crypt.h>

	char *gnu_ext_crypt(char *pass, char *salt) {

		char *enc = NULL;

		char *ret = NULL;

		struct crypt_data data;

		data.initialized = 0;

		enc = crypt_r(pass, salt, &data);

		if(enc == NULL) {

			return NULL;

		}

		ret = (char *)malloc((strlen(enc)+1) * sizeof(char)); // for trailing null

		strcpy(ret, enc);

		ret[strlen(enc)]= '\0';

	 return ret;

	}

*/

import "C"

// Crypt provides a wrapper around the glibc crypt_r() function.

// For the meaning of the arguments, refer to the package README.

func crypt(pass, salt string) (string, error) {

	c_pass := C.CString(pass)

	defer C.free(unsafe.Pointer(c_pass))

	c_salt := C.CString(salt)

	defer C.free(unsafe.Pointer(c_salt))

	c_enc, err := C.gnu_ext_crypt(c_pass, c_salt)

	if c_enc == nil {

		return "", err

	}

	defer C.free(unsafe.Pointer(c_enc))

	// Return nil error if the string is non-nil.

	// As per the errno.h manpage, functions are allowed to set errno

	// on success. Caller should ignore errno on success.

	return C.GoString(c_enc), nil

}