| // Copyright 2009 The Go Authors. All rights reserved. | |
| // Use of this source code is governed by a BSD-style | |
| // license that can be found in the LICENSE file. | |
| /* | |
| A trivial example of wrapping a C library in Go. | |
| For a more complex example and explanation, | |
| see misc/cgo/gmp/gmp.go. | |
| */ | |
| package stdio | |
| /* | |
| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <sys/stat.h> | |
| #include <errno.h> | |
| char* greeting = "hello, world"; | |
| */ | |
| import "C" | |
| import "unsafe" | |
| type File C.FILE | |
| // Test reference to library symbol. | |
| // Stdout and stderr are too special to be a reliable test. | |
| //var = C.environ | |
| func (f *File) WriteString(s string) { | |
| p := C.CString(s) | |
| C.fputs(p, (*C.FILE)(f)) | |
| C.free(unsafe.Pointer(p)) | |
| f.Flush() | |
| } | |
| func (f *File) Flush() { | |
| C.fflush((*C.FILE)(f)) | |
| } | |
| var Greeting = C.GoString(C.greeting) | |
| var Gbytes = C.GoBytes(unsafe.Pointer(C.greeting), C.int(len(Greeting))) | |