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[libc][POSIX] implement fseeko, ftello (#86928)
Fixes: #85287
1 parent 5bbc640 commit 55b7403

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11 files changed

+130
-4
lines changed

11 files changed

+130
-4
lines changed

‎libc/config/linux/x86_64/entrypoints.txt

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@@ -681,6 +681,8 @@ if(LLVM_LIBC_FULL_BUILD)
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libc.src.stdio.fread_unlocked
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libc.src.stdio.fseek
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libc.src.stdio.ftell
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libc.src.stdio.fseeko
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libc.src.stdio.ftello
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libc.src.stdio.funlockfile
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libc.src.stdio.fwrite
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libc.src.stdio.fwrite_unlocked

‎libc/src/stdio/CMakeLists.txt

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@@ -270,6 +270,8 @@ add_stdio_entrypoint_object(ferror)
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add_stdio_entrypoint_object(ferror_unlocked)
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add_stdio_entrypoint_object(fseek)
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add_stdio_entrypoint_object(ftell)
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add_stdio_entrypoint_object(fseeko)
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add_stdio_entrypoint_object(ftello)
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add_stdio_entrypoint_object(fflush)
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add_stdio_entrypoint_object(clearerr)
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add_stdio_entrypoint_object(clearerr_unlocked)

‎libc/src/stdio/fseeko.h

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@@ -0,0 +1,20 @@
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//===-- Implementation header of fseeko -------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIBC_SRC_STDIO_FSEEKO_H
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#define LLVM_LIBC_SRC_STDIO_FSEEKO_H
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#include <stdio.h>
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namespace LIBC_NAMESPACE {
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int fseeko(::FILE *stream, off_t offset, int whence);
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} // namespace LIBC_NAMESPACE
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#endif // LLVM_LIBC_SRC_STDIO_FSEEKO_H

‎libc/src/stdio/ftello.h

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@@ -0,0 +1,20 @@
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//===-- Implementation header of ftello -------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIBC_SRC_STDIO_FTELLO_H
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#define LLVM_LIBC_SRC_STDIO_FTELLO_H
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#include <stdio.h>
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namespace LIBC_NAMESPACE {
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off_t ftello(::FILE *f);
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} // namespace LIBC_NAMESPACE
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#endif // LLVM_LIBC_SRC_STDIO_FTELLO_H

‎libc/src/stdio/generic/CMakeLists.txt

Lines changed: 24 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -103,7 +103,6 @@ add_entrypoint_object(
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../fseek.h
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DEPENDS
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libc.src.errno.errno
106-
libc.include.stdio
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libc.src.__support.File.file
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libc.src.__support.File.platform_file
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)
@@ -116,7 +115,30 @@ add_entrypoint_object(
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../ftell.h
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DEPENDS
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libc.src.errno.errno
119-
libc.include.stdio
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libc.src.__support.File.file
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libc.src.__support.File.platform_file
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)
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add_entrypoint_object(
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fseeko
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SRCS
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fseeko.cpp
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HDRS
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../fseeko.h
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DEPENDS
129+
libc.src.errno.errno
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libc.src.__support.File.file
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libc.src.__support.File.platform_file
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)
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add_entrypoint_object(
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ftello
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SRCS
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ftello.cpp
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HDRS
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../ftello.h
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DEPENDS
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libc.src.errno.errno
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libc.src.__support.File.file
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libc.src.__support.File.platform_file
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)

‎libc/src/stdio/generic/fseek.cpp

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@@ -10,7 +10,6 @@
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#include "src/__support/File/file.h"
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#include "src/errno/libc_errno.h"
13-
#include <stdio.h>
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namespace LIBC_NAMESPACE {
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‎libc/src/stdio/generic/fseeko.cpp

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@@ -0,0 +1,26 @@
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//===-- Implementation of fseeko ------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "src/stdio/fseeko.h"
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#include "src/__support/File/file.h"
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#include "src/errno/libc_errno.h"
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namespace LIBC_NAMESPACE {
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LLVM_LIBC_FUNCTION(int, fseeko, (::FILE * stream, off_t offset, int whence)) {
17+
auto result =
18+
reinterpret_cast<LIBC_NAMESPACE::File *>(stream)->seek(offset, whence);
19+
if (!result.has_value()) {
20+
libc_errno = result.error();
21+
return -1;
22+
}
23+
return 0;
24+
}
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} // namespace LIBC_NAMESPACE

‎libc/src/stdio/generic/ftell.cpp

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@@ -10,7 +10,6 @@
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#include "src/__support/File/file.h"
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1212
#include "src/errno/libc_errno.h"
13-
#include <stdio.h>
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namespace LIBC_NAMESPACE {
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‎libc/src/stdio/generic/ftello.cpp

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,25 @@
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//===-- Implementation of ftello ------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
5+
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
8+
9+
#include "src/stdio/ftello.h"
10+
#include "src/__support/File/file.h"
11+
12+
#include "src/errno/libc_errno.h"
13+
14+
namespace LIBC_NAMESPACE {
15+
16+
LLVM_LIBC_FUNCTION(off_t, ftello, (::FILE * stream)) {
17+
auto result = reinterpret_cast<LIBC_NAMESPACE::File *>(stream)->tell();
18+
if (!result.has_value()) {
19+
libc_errno = result.error();
20+
return -1;
21+
}
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return result.value();
23+
}
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} // namespace LIBC_NAMESPACE

‎libc/test/src/stdio/CMakeLists.txt

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -442,6 +442,8 @@ add_libc_test(
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libc.src.stdio.fread
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libc.src.stdio.fseek
444444
libc.src.stdio.ftell
445+
libc.src.stdio.fseeko
446+
libc.src.stdio.ftello
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libc.src.stdio.fwrite
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libc.src.stdio.setvbuf
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)

‎libc/test/src/stdio/ftell_test.cpp

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Original file line numberDiff line numberDiff line change
@@ -10,7 +10,9 @@
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#include "src/stdio/fopen.h"
1111
#include "src/stdio/fread.h"
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#include "src/stdio/fseek.h"
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#include "src/stdio/fseeko.h"
1314
#include "src/stdio/ftell.h"
15+
#include "src/stdio/ftello.h"
1416
#include "src/stdio/fwrite.h"
1517
#include "src/stdio/setvbuf.h"
1618
#include "test/UnitTest/Test.h"
@@ -37,6 +39,13 @@ class LlvmLibcFTellTest : public LIBC_NAMESPACE::testing::Test {
3739
// still return the correct effective offset.
3840
ASSERT_EQ(size_t(LIBC_NAMESPACE::ftell(file)), WRITE_SIZE);
3941

42+
off_t offseto = 42;
43+
ASSERT_EQ(0, LIBC_NAMESPACE::fseeko(file, offseto, SEEK_SET));
44+
ASSERT_EQ(LIBC_NAMESPACE::ftello(file), offseto);
45+
ASSERT_EQ(0, LIBC_NAMESPACE::fseeko(file, -offseto, SEEK_END));
46+
ASSERT_EQ(size_t(LIBC_NAMESPACE::ftello(file)),
47+
size_t(WRITE_SIZE - offseto));
48+
4049
long offset = 5;
4150
ASSERT_EQ(0, LIBC_NAMESPACE::fseek(file, offset, SEEK_SET));
4251
ASSERT_EQ(LIBC_NAMESPACE::ftell(file), offset);

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