diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -5,6 +5,7 @@
     # ctype.h entrypoints
     libc.src.ctype.isalnum
     libc.src.ctype.isalpha
+    libc.src.ctype.isascii
     libc.src.ctype.isblank
     libc.src.ctype.iscntrl
     libc.src.ctype.isdigit
@@ -15,6 +16,7 @@
     libc.src.ctype.isspace
     libc.src.ctype.isupper
     libc.src.ctype.isxdigit
+    libc.src.ctype.toascii
     libc.src.ctype.tolower
     libc.src.ctype.toupper
 
diff --git a/libc/src/ctype/CMakeLists.txt b/libc/src/ctype/CMakeLists.txt
--- a/libc/src/ctype/CMakeLists.txt
+++ b/libc/src/ctype/CMakeLists.txt
@@ -24,6 +24,14 @@
     .ctype_utils
 )
 
+add_entrypoint_object(
+  isascii
+  SRCS
+    isascii.cpp
+  HDRS
+    isascii.h
+)
+
 add_entrypoint_object(
   isblank
   SRCS
@@ -126,6 +134,14 @@
     .ctype_utils
 )
 
+add_entrypoint_object(
+  toascii
+  SRCS
+    toascii.cpp
+  HDRS
+    toascii.h
+)
+
 add_entrypoint_object(
   toupper
   SRCS
diff --git a/libc/src/ctype/isascii.h b/libc/src/ctype/isascii.h
new file mode 100644
--- /dev/null
+++ b/libc/src/ctype/isascii.h
@@ -0,0 +1,18 @@
+//===-- Implementation header for isascii -------------------------*-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_CTYPE_ISASCII_H
+#define LLVM_LIBC_SRC_CTYPE_ISASCII_H
+
+namespace __llvm_libc {
+
+int isascii(int c);
+
+} // namespace __llvm_libc
+
+#endif //  LLVM_LIBC_SRC_CTYPE_ISASCII_H
diff --git a/libc/src/ctype/isascii.cpp b/libc/src/ctype/isascii.cpp
new file mode 100644
--- /dev/null
+++ b/libc/src/ctype/isascii.cpp
@@ -0,0 +1,17 @@
+//===-- Implementation of isascii------------------------------------------===//
+//
+// 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/ctype/isascii.h"
+
+#include "src/__support/common.h"
+
+namespace __llvm_libc {
+
+LLVM_LIBC_FUNCTION(int, isascii, (int c)) { return (c & (~0x7f)) == 0; }
+
+} // namespace __llvm_libc
diff --git a/libc/src/ctype/toascii.h b/libc/src/ctype/toascii.h
new file mode 100644
--- /dev/null
+++ b/libc/src/ctype/toascii.h
@@ -0,0 +1,18 @@
+//===-- Implementation header for toascii -------------------------*-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_CTYPE_TOASCII_H
+#define LLVM_LIBC_SRC_CTYPE_TOASCII_H
+
+namespace __llvm_libc {
+
+int toascii(int c);
+
+} // namespace __llvm_libc
+
+#endif //  LLVM_LIBC_SRC_CTYPE_TOASCII_H
diff --git a/libc/src/ctype/toascii.cpp b/libc/src/ctype/toascii.cpp
new file mode 100644
--- /dev/null
+++ b/libc/src/ctype/toascii.cpp
@@ -0,0 +1,17 @@
+//===-- Implementation of toascii------------------------------------------===//
+//
+// 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/ctype/toascii.h"
+
+#include "src/__support/common.h"
+
+namespace __llvm_libc {
+
+LLVM_LIBC_FUNCTION(int, toascii, (int c)) { return (c & 0x7f); }
+
+} // namespace __llvm_libc
diff --git a/libc/test/src/ctype/CMakeLists.txt b/libc/test/src/ctype/CMakeLists.txt
--- a/libc/test/src/ctype/CMakeLists.txt
+++ b/libc/test/src/ctype/CMakeLists.txt
@@ -20,6 +20,16 @@
     libc.src.ctype.isalpha
 )
 
+add_libc_unittest(
+  isascii
+  SUITE
+    libc_ctype_unittests
+  SRCS
+    isascii_test.cpp
+  DEPENDS
+    libc.src.ctype.isascii
+)
+
 add_libc_unittest(
   isblank
   SUITE
@@ -120,6 +130,16 @@
     libc.src.ctype.isxdigit
 )
 
+add_libc_unittest(
+  toascii
+  SUITE
+    libc_ctype_unittests
+  SRCS
+    toascii_test.cpp
+  DEPENDS
+    libc.src.ctype.toascii
+)
+
 add_libc_unittest(
   tolower
   SUITE
diff --git a/libc/test/src/ctype/isascii_test.cpp b/libc/test/src/ctype/isascii_test.cpp
new file mode 100644
--- /dev/null
+++ b/libc/test/src/ctype/isascii_test.cpp
@@ -0,0 +1,23 @@
+//===-- Unittests for isascii----------------------------------------------===//
+//
+// 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/ctype/isascii.h"
+
+#include "utils/UnitTest/Test.h"
+
+TEST(IsAscii, DefaultLocale) {
+  // Loops through all characters, verifying that ascii characters
+  //    (which are all 7 bit unsigned integers)
+  // return a non-zero integer and everything else returns zero.
+  for (int ch = 0; ch < 255; ++ch) {
+    if (ch <= 0x7f)
+      EXPECT_NE(__llvm_libc::isascii(ch), 0);
+    else
+      EXPECT_EQ(__llvm_libc::isascii(ch), 0);
+  }
+}
diff --git a/libc/test/src/ctype/toascii_test.cpp b/libc/test/src/ctype/toascii_test.cpp
new file mode 100644
--- /dev/null
+++ b/libc/test/src/ctype/toascii_test.cpp
@@ -0,0 +1,24 @@
+//===-- Unittests for toascii----------------------------------------------===//
+//
+// 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/ctype/toascii.h"
+
+#include "utils/UnitTest/Test.h"
+
+TEST(ToAscii, DefaultLocale) {
+  // Loops through all characters, verifying that ascii characters
+  //    (which are all 7 bit unsigned integers)
+  // return themself, and that all other characters return themself
+  // mod 128 (which is equivalent to & 0x7f)
+  for (int ch = 0; ch < 255; ++ch) {
+    if (ch <= 0x7f)
+      EXPECT_EQ(__llvm_libc::toascii(ch), ch);
+    else
+      EXPECT_EQ(__llvm_libc::toascii(ch), ch & 0x7f);
+  }
+}