1 // skip 2 3 // Copyright 2009 The Go Authors. All rights reserved. 4 // Use of this source code is governed by a BSD-style 5 // license that can be found in the LICENSE file. 6 7 /* 8 A trivial example of wrapping a C library in Go. 9 For a more complex example and explanation, 10 see ../gmp/gmp.go. 11 */ 12 13 package stdio 14 15 /* 16 #include <stdio.h> 17 #include <stdlib.h> 18 #include <sys/stat.h> 19 #include <errno.h> 20 21 char* greeting = "hello, world"; 22 */ 23 import "C" 24 import "unsafe" 25 26 type File C.FILE 27 28 // Test reference to library symbol. 29 // Stdout and stderr are too special to be a reliable test. 30 //var = C.environ 31 32 func (f *File) WriteString(s string) { 33 p := C.CString(s) 34 C.fputs(p, (*C.FILE)(f)) 35 C.free(unsafe.Pointer(p)) 36 f.Flush() 37 } 38 39 func (f *File) Flush() { 40 C.fflush((*C.FILE)(f)) 41 } 42 43 var Greeting = C.GoString(C.greeting) 44 var Gbytes = C.GoBytes(unsafe.Pointer(C.greeting), C.int(len(Greeting))) 45
