1//===-- Implementation of fopencookie -------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "src/stdio/fopencookie.h"
10#include "src/__support/CPP/new.h"
11#include "src/__support/File/file.h"
12
13#include "src/errno/libc_errno.h"
14#include <stdio.h>
15#include <stdlib.h>
16
17namespace LIBC_NAMESPACE {
18
19namespace {
20
21class CookieFile : public LIBC_NAMESPACE::File {
22 void *cookie;
23 cookie_io_functions_t ops;
24
25 static FileIOResult cookie_write(File *f, const void *data, size_t size);
26 static FileIOResult cookie_read(File *f, void *data, size_t size);
27 static ErrorOr<long> cookie_seek(File *f, long offset, int whence);
28 static int cookie_close(File *f);
29
30public:
31 CookieFile(void *c, cookie_io_functions_t cops, uint8_t *buffer,
32 size_t bufsize, File::ModeFlags mode)
33 : File(&cookie_write, &cookie_read, &CookieFile::cookie_seek,
34 &cookie_close, buffer, bufsize, 0 /* default buffering mode */,
35 true /* File owns buffer */, mode),
36 cookie(c), ops(cops) {}
37};
38
39FileIOResult CookieFile::cookie_write(File *f, const void *data, size_t size) {
40 auto cookie_file = reinterpret_cast<CookieFile *>(f);
41 if (cookie_file->ops.write == nullptr)
42 return 0;
43 return cookie_file->ops.write(cookie_file->cookie,
44 reinterpret_cast<const char *>(data), size);
45}
46
47FileIOResult CookieFile::cookie_read(File *f, void *data, size_t size) {
48 auto cookie_file = reinterpret_cast<CookieFile *>(f);
49 if (cookie_file->ops.read == nullptr)
50 return 0;
51 return cookie_file->ops.read(cookie_file->cookie,
52 reinterpret_cast<char *>(data), size);
53}
54
55ErrorOr<long> CookieFile::cookie_seek(File *f, long offset, int whence) {
56 auto cookie_file = reinterpret_cast<CookieFile *>(f);
57 if (cookie_file->ops.seek == nullptr) {
58 return Error(EINVAL);
59 }
60 off64_t offset64 = offset;
61 int result = cookie_file->ops.seek(cookie_file->cookie, &offset64, whence);
62 if (result == 0)
63 return offset64;
64 else
65 return -1;
66}
67
68int CookieFile::cookie_close(File *f) {
69 auto cookie_file = reinterpret_cast<CookieFile *>(f);
70 if (cookie_file->ops.close == nullptr)
71 return 0;
72 int retval = cookie_file->ops.close(cookie_file->cookie);
73 if (retval != 0)
74 return retval;
75 delete cookie_file;
76 return 0;
77}
78
79} // anonymous namespace
80
81LLVM_LIBC_FUNCTION(::FILE *, fopencookie,
82 (void *cookie, const char *mode,
83 cookie_io_functions_t ops)) {
84 uint8_t *buffer;
85 {
86 AllocChecker ac;
87 buffer = new (ac) uint8_t[File::DEFAULT_BUFFER_SIZE];
88 if (!ac)
89 return nullptr;
90 }
91 AllocChecker ac;
92 auto *file = new (ac) CookieFile(
93 cookie, ops, buffer, File::DEFAULT_BUFFER_SIZE, File::mode_flags(mode));
94 if (!ac)
95 return nullptr;
96 return reinterpret_cast<::FILE *>(file);
97}
98
99} // namespace LIBC_NAMESPACE
100

source code of libc/src/stdio/fopencookie.cpp