[libc] Add isspace, isprint, isxdigit implementations.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D85270

4 files changed, 97 insertions, 0 deletions

diff --git a/libc/test/src/ctype/CMakeLists.txt b/libc/test/src/ctype/CMakeLists.txt
index 3adf5739d72a..0d77134b95eb 100644
--- a/libc/test/src/ctype/CMakeLists.txt
+++ b/libc/test/src/ctype/CMakeLists.txt
@@ -71,6 +71,16 @@ add_libc_unittest(
 )
 
 add_libc_unittest(
+  isprint
+  SUITE
+    libc_ctype_unittests
+  SRCS
+    isprint_test.cpp
+  DEPENDS
+    libc.src.ctype.isprint
+)
+
+add_libc_unittest(
   ispunct
   SUITE
     libc_ctype_unittests
@@ -81,6 +91,16 @@ add_libc_unittest(
 )
 
 add_libc_unittest(
+  isspace
+  SUITE
+    libc_ctype_unittests
+  SRCS
+    isspace_test.cpp
+  DEPENDS
+    libc.src.ctype.isspace
+)
+
+add_libc_unittest(
   isupper
   SUITE
     libc_ctype_unittests
@@ -89,3 +109,13 @@ add_libc_unittest(
   DEPENDS
     libc.src.ctype.isupper
 )
+
+add_libc_unittest(
+  isxdigit
+  SUITE
+    libc_ctype_unittests
+  SRCS
+    isxdigit_test.cpp
+  DEPENDS
+    libc.src.ctype.isxdigit
+)
diff --git a/libc/test/src/ctype/isprint_test.cpp b/libc/test/src/ctype/isprint_test.cpp
new file mode 100644
index 000000000000..565453e0013c
--- /dev/null
+++ b/libc/test/src/ctype/isprint_test.cpp
@@ -0,0 +1,19 @@
+//===-- Unittests for isprint----------------------------------------------===//
+//
+// 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/isprint.h"
+#include "utils/UnitTest/Test.h"
+
+TEST(IsPrint, DefaultLocale) {
+  for (int ch = 0; ch < 255; ++ch) {
+    if (' ' <= ch && ch <= '~') // A-Z, a-z, 0-9, punctuation, space.
+      EXPECT_NE(__llvm_libc::isprint(ch), 0);
+    else
+      EXPECT_EQ(__llvm_libc::isprint(ch), 0);
+  }
+}
diff --git a/libc/test/src/ctype/isspace_test.cpp b/libc/test/src/ctype/isspace_test.cpp
new file mode 100644
index 000000000000..e1caded67452
--- /dev/null
+++ b/libc/test/src/ctype/isspace_test.cpp
@@ -0,0 +1,28 @@
+//===-- Unittests for isspace----------------------------------------------===//
+//
+// 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/isspace.h"
+#include "utils/UnitTest/Test.h"
+
+TEST(IsSpace, DefaultLocale) {
+  // Loops through all characters, verifying that space characters
+  // return true and everything else returns false.
+  // Hexadecimal | Symbol
+  // ---------------------------
+  //    0x09     |   horizontal tab
+  //    0x0a     |   line feed
+  //    0x0b     |   vertical tab
+  //    0x0d     |   carriage return
+  //    0x20     |   space
+  for (int ch = 0; ch < 255; ++ch) {
+    if (ch == 0x20 || (0x09 <= ch && ch <= 0x0d))
+      EXPECT_NE(__llvm_libc::isspace(ch), 0);
+    else
+      EXPECT_EQ(__llvm_libc::isspace(ch), 0);
+  }
+}
diff --git a/libc/test/src/ctype/isxdigit_test.cpp b/libc/test/src/ctype/isxdigit_test.cpp
new file mode 100644
index 000000000000..570cb82b3c78
--- /dev/null
+++ b/libc/test/src/ctype/isxdigit_test.cpp
@@ -0,0 +1,20 @@
+//===-- Unittests for isxdigit---------------------------------------------===//
+//
+// 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/isxdigit.h"
+#include "utils/UnitTest/Test.h"
+
+TEST(IsXDigit, DefaultLocale) {
+  for (int ch = 0; ch < 255; ++ch) {
+    if (('0' <= ch && ch <= '9') || ('a' <= ch && ch <= 'f') ||
+        ('A' <= ch && ch <= 'F'))
+      EXPECT_NE(__llvm_libc::isxdigit(ch), 0);
+    else
+      EXPECT_EQ(__llvm_libc::isxdigit(ch), 0);
+  }
+}