[libc]: add vsscanf and vaprintf

libc/config/linux/aarch64/entrypoints.txt

@@ -344,6 +344,8 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.stdlib.strtoll_l
     libc.src.ctype.isdigit_l
     libc.src.ctype.isxdigit_l
+    libc.src.stdio.vsscanf
+    libc.src.stdio.vaprintf
 
 )
 

libc/config/linux/x86_64/entrypoints.txt

@@ -354,6 +354,8 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.stdlib.strtoll_l
     libc.src.ctype.isdigit_l
     libc.src.ctype.isxdigit_l
+    libc.src.stdio.vsscanf
+    libc.src.stdio.vaprintf
 )
 
 set(TARGET_LIBM_ENTRYPOINTS

libc/spec/stdc.td

@@ -975,6 +975,20 @@ def StdC : StandardSpec<"stdc"> {
               RetValSpec<IntType>,
               [ArgSpec<IntType>, ArgSpec<FILEPtr>]
           >,
+          FunctionSpec<
+              "vaprintf",
+              RetValSpec<IntType>,
+              [ArgSpec<CharPtr>,
+               ArgSpec<ConstCharPtr>,
+               ArgSpec<VaListType>]
+          >,
+          FunctionSpec<
+              "vsscanf",
+              RetValSpec<IntType>,
+              [ArgSpec<ConstCharPtr>,
+               ArgSpec<ConstCharPtr>,
+               ArgSpec<VaListType>]
+          >,
       ],
       [
           ObjectSpec<

libc/src/stdio/CMakeLists.txt

@@ -203,6 +203,26 @@ add_entrypoint_object(
     libc.src.stdio.printf_core.vfprintf_internal
 )
 
+add_entrypoint_object(
+  vaprintf
+  SRCS
+    vaprintf.cpp
+  HDRS
+    vaprintf.h
+  DEPENDS
+    libc.src.__support.arg_list
+)
+
+add_entrypoint_object(
+  vsscanf
+  SRCS
+    vsscanf.cpp
+  HDRS
+    vsscanf.h
+  DEPENDS
+    libc.src.__support.arg_list
+)
+
 add_stdio_entrypoint_object(
   fileno
   SRCS

libc/src/stdio/vaprintf.cpp

@@ -0,0 +1,27 @@
+//===-- Implementation of vaprintf ------------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/stdio/vaprintf.h"
+
+#include "src/__support/arg_list.h"
+
+#include <stdarg.h>
+#include <stdio.h>
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(int, vaprintf,
+                   (char *, const char *,
+                    va_list vlist)) {
+  internal::ArgList args(vlist); // This holder class allows for easier copying
+                                 // and pointer semantics, as well as handling
+                                 // destruction automatically.
+  return -1;
+}
+
+} // namespace LIBC_NAMESPACE

libc/src/stdio/vaprintf.h

@@ -0,0 +1,22 @@
+//===-- Implementation header of vaprintf -----------------------*- 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_VAPRINTF_H
+#define LLVM_LIBC_SRC_STDIO_VAPRINTF_H
+
+#include <stdarg.h>
+#include <stdio.h>
+
+namespace LIBC_NAMESPACE {
+
+int vaprintf(char * s, const char * format,
+             va_list vlist);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_STDIO_VAPRINTF_H

libc/src/stdio/vsscanf.cpp

@@ -0,0 +1,28 @@
+//===-- Implementation of vsscanf -------------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/stdio/vsscanf.h"
+
+#include "src/__support/arg_list.h"
+
+#include <stdarg.h>
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(int, vsscanf,
+                   (const char *, const char *,
+                    va_list vlist)) {
+  internal::ArgList args(vlist); // This holder class allows for easier copying
+                                 // and pointer semantics, as well as handling
+                                 // destruction automatically.
+
+
+  return -1;
+}
+
+} // namespace LIBC_NAMESPACE

libc/src/stdio/vsscanf.h

@@ -0,0 +1,21 @@
+//===-- Implementation header of vsscanf ------------------------*- 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_VSSCANF_H
+#define LLVM_LIBC_SRC_STDIO_VSSCANF_H
+
+#include <stdarg.h>
+
+namespace LIBC_NAMESPACE {
+
+int vsscanf(const char * s, const char * format,
+             va_list vlist);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_STDIO_VSSCANF_H