[libc-commits] [libc] [libc][POSIX] implement fseeko, ftello (PR #86928)

Shourya Goel via libc-commits libc-commits at lists.llvm.org
Thu Mar 28 03:11:06 PDT 2024


https://github.com/Sh0g0-1758 created https://github.com/llvm/llvm-project/pull/86928

Fixes: #85287

>From 10b8074e95e604a44bcdb91eeca9087d089e7a36 Mon Sep 17 00:00:00 2001
From: Sh0g0-1758 <shouryagoel10000 at gmail.com>
Date: Thu, 28 Mar 2024 15:34:47 +0530
Subject: [PATCH] Added implementation

Ran Formatter
---
 libc/config/linux/x86_64/entrypoints.txt |  2 ++
 libc/src/stdio/CMakeLists.txt            |  2 ++
 libc/src/stdio/fseeko.h                  | 20 ++++++++++++++++++
 libc/src/stdio/ftello.h                  | 20 ++++++++++++++++++
 libc/src/stdio/generic/CMakeLists.txt    | 26 +++++++++++++++++++++++
 libc/src/stdio/generic/fseeko.cpp        | 27 ++++++++++++++++++++++++
 libc/src/stdio/generic/ftello.cpp        | 26 +++++++++++++++++++++++
 libc/test/src/stdio/CMakeLists.txt       |  2 ++
 libc/test/src/stdio/ftell_test.cpp       |  9 ++++++++
 9 files changed, 134 insertions(+)
 create mode 100644 libc/src/stdio/fseeko.h
 create mode 100644 libc/src/stdio/ftello.h
 create mode 100644 libc/src/stdio/generic/fseeko.cpp
 create mode 100644 libc/src/stdio/generic/ftello.cpp

diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index 5b428e51aee620..a4d0da5e043d4f 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -681,6 +681,8 @@ if(LLVM_LIBC_FULL_BUILD)
     libc.src.stdio.fread_unlocked
     libc.src.stdio.fseek
     libc.src.stdio.ftell
+    libc.src.stdio.fseeko
+    libc.src.stdio.ftello
     libc.src.stdio.funlockfile
     libc.src.stdio.fwrite
     libc.src.stdio.fwrite_unlocked
diff --git a/libc/src/stdio/CMakeLists.txt b/libc/src/stdio/CMakeLists.txt
index 11e15c91735188..1056f38fc7513a 100644
--- a/libc/src/stdio/CMakeLists.txt
+++ b/libc/src/stdio/CMakeLists.txt
@@ -270,6 +270,8 @@ add_stdio_entrypoint_object(ferror)
 add_stdio_entrypoint_object(ferror_unlocked)
 add_stdio_entrypoint_object(fseek)
 add_stdio_entrypoint_object(ftell)
+add_stdio_entrypoint_object(fseeko)
+add_stdio_entrypoint_object(ftello)
 add_stdio_entrypoint_object(fflush)
 add_stdio_entrypoint_object(clearerr)
 add_stdio_entrypoint_object(clearerr_unlocked)
diff --git a/libc/src/stdio/fseeko.h b/libc/src/stdio/fseeko.h
new file mode 100644
index 00000000000000..77fb41215c318f
--- /dev/null
+++ b/libc/src/stdio/fseeko.h
@@ -0,0 +1,20 @@
+//===-- Implementation header of fseeko -------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_STDIO_FSEEKO_H
+#define LLVM_LIBC_SRC_STDIO_FSEEKO_H
+
+#include <stdio.h>
+
+namespace LIBC_NAMESPACE {
+
+int fseeko(::FILE *stream, off_t offset, int whence);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_STDIO_FSEEKO_H
diff --git a/libc/src/stdio/ftello.h b/libc/src/stdio/ftello.h
new file mode 100644
index 00000000000000..5ab17f9244a5ad
--- /dev/null
+++ b/libc/src/stdio/ftello.h
@@ -0,0 +1,20 @@
+//===-- Implementation header of ftello -------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_STDIO_FTELLO_H
+#define LLVM_LIBC_SRC_STDIO_FTELLO_H
+
+#include <stdio.h>
+
+namespace LIBC_NAMESPACE {
+
+off_t ftello(::FILE *f);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_STDIO_FTELLO_H
diff --git a/libc/src/stdio/generic/CMakeLists.txt b/libc/src/stdio/generic/CMakeLists.txt
index 0aa213caba7b8a..4b04c2e6df6022 100644
--- a/libc/src/stdio/generic/CMakeLists.txt
+++ b/libc/src/stdio/generic/CMakeLists.txt
@@ -121,6 +121,32 @@ add_entrypoint_object(
     libc.src.__support.File.platform_file
 )
 
+add_entrypoint_object(
+  fseeko
+  SRCS
+    fseeko.cpp
+  HDRS
+    ../fseeko.h
+  DEPENDS
+    libc.src.errno.errno
+    libc.include.stdio
+    libc.src.__support.File.file
+    libc.src.__support.File.platform_file
+)
+
+add_entrypoint_object(
+  ftello
+  SRCS
+    ftello.cpp
+  HDRS
+    ../ftello.h
+  DEPENDS
+    libc.src.errno.errno
+    libc.include.stdio
+    libc.src.__support.File.file
+    libc.src.__support.File.platform_file
+)
+
 add_entrypoint_object(
   fopen
   SRCS
diff --git a/libc/src/stdio/generic/fseeko.cpp b/libc/src/stdio/generic/fseeko.cpp
new file mode 100644
index 00000000000000..aa581d9f06ea8c
--- /dev/null
+++ b/libc/src/stdio/generic/fseeko.cpp
@@ -0,0 +1,27 @@
+//===-- Implementation of fseeko ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/stdio/fseeko.h"
+#include "src/__support/File/file.h"
+
+#include "src/errno/libc_errno.h"
+#include <stdio.h>
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(int, fseeko, (::FILE * stream, off_t offset, int whence)) {
+  auto result =
+      reinterpret_cast<LIBC_NAMESPACE::File *>(stream)->seek(offset, whence);
+  if (!result.has_value()) {
+    libc_errno = result.error();
+    return -1;
+  }
+  return 0;
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/stdio/generic/ftello.cpp b/libc/src/stdio/generic/ftello.cpp
new file mode 100644
index 00000000000000..50d222e45249fa
--- /dev/null
+++ b/libc/src/stdio/generic/ftello.cpp
@@ -0,0 +1,26 @@
+//===-- Implementation of ftello ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/stdio/ftello.h"
+#include "src/__support/File/file.h"
+
+#include "src/errno/libc_errno.h"
+#include <stdio.h>
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(off_t, ftello, (::FILE * stream)) {
+  auto result = reinterpret_cast<LIBC_NAMESPACE::File *>(stream)->tell();
+  if (!result.has_value()) {
+    libc_errno = result.error();
+    return -1;
+  }
+  return result.value();
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/test/src/stdio/CMakeLists.txt b/libc/test/src/stdio/CMakeLists.txt
index 4c38e8aba7d7f2..03c43eaefebe5e 100644
--- a/libc/test/src/stdio/CMakeLists.txt
+++ b/libc/test/src/stdio/CMakeLists.txt
@@ -442,6 +442,8 @@ add_libc_test(
     libc.src.stdio.fread
     libc.src.stdio.fseek
     libc.src.stdio.ftell
+    libc.src.stdio.fseeko
+    libc.src.stdio.ftello
     libc.src.stdio.fwrite
     libc.src.stdio.setvbuf
 )
diff --git a/libc/test/src/stdio/ftell_test.cpp b/libc/test/src/stdio/ftell_test.cpp
index 61b626f53cd26e..68a969ed0c30dd 100644
--- a/libc/test/src/stdio/ftell_test.cpp
+++ b/libc/test/src/stdio/ftell_test.cpp
@@ -10,7 +10,9 @@
 #include "src/stdio/fopen.h"
 #include "src/stdio/fread.h"
 #include "src/stdio/fseek.h"
+#include "src/stdio/fseeko.h"
 #include "src/stdio/ftell.h"
+#include "src/stdio/ftello.h"
 #include "src/stdio/fwrite.h"
 #include "src/stdio/setvbuf.h"
 #include "test/UnitTest/Test.h"
@@ -37,6 +39,13 @@ class LlvmLibcFTellTest : public LIBC_NAMESPACE::testing::Test {
     // still return the correct effective offset.
     ASSERT_EQ(size_t(LIBC_NAMESPACE::ftell(file)), WRITE_SIZE);
 
+    off_t offseto = 42;
+    ASSERT_EQ(0, LIBC_NAMESPACE::fseeko(file, offseto, SEEK_SET));
+    ASSERT_EQ(LIBC_NAMESPACE::ftello(file), offseto);
+    ASSERT_EQ(0, LIBC_NAMESPACE::fseeko(file, -offseto, SEEK_END));
+    ASSERT_EQ(size_t(LIBC_NAMESPACE::ftello(file)),
+              size_t(WRITE_SIZE - offseto));
+
     long offset = 5;
     ASSERT_EQ(0, LIBC_NAMESPACE::fseek(file, offset, SEEK_SET));
     ASSERT_EQ(LIBC_NAMESPACE::ftell(file), offset);



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