[libc] Add implementations for isblank, iscntrl, isgraph, ispunct.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D85059

5 files changed, 137 insertions, 0 deletions

diff --git a/libc/test/src/ctype/CMakeLists.txt b/libc/test/src/ctype/CMakeLists.txt
index c9959465c697..3adf5739d72a 100644
--- a/libc/test/src/ctype/CMakeLists.txt
+++ b/libc/test/src/ctype/CMakeLists.txt
@@ -21,6 +21,26 @@ add_libc_unittest(
 )
 
 add_libc_unittest(
+  isblank
+  SUITE
+    libc_ctype_unittests
+  SRCS
+    isblank_test.cpp
+  DEPENDS
+    libc.src.ctype.isblank
+)
+
+add_libc_unittest(
+  iscntrl
+  SUITE
+    libc_ctype_unittests
+  SRCS
+    iscntrl_test.cpp
+  DEPENDS
+    libc.src.ctype.iscntrl
+)
+
+add_libc_unittest(
   isdigit
   SUITE
     libc_ctype_unittests
@@ -31,6 +51,16 @@ add_libc_unittest(
 )
 
 add_libc_unittest(
+  isgraph
+  SUITE
+    libc_ctype_unittests
+  SRCS
+    isgraph_test.cpp
+  DEPENDS
+    libc.src.ctype.isgraph
+)
+
+add_libc_unittest(
   islower
   SUITE
     libc_ctype_unittests
@@ -41,6 +71,16 @@ add_libc_unittest(
 )
 
 add_libc_unittest(
+  ispunct
+  SUITE
+    libc_ctype_unittests
+  SRCS
+    ispunct_test.cpp
+  DEPENDS
+    libc.src.ctype.ispunct
+)
+
+add_libc_unittest(
   isupper
   SUITE
     libc_ctype_unittests
diff --git a/libc/test/src/ctype/isblank_test.cpp b/libc/test/src/ctype/isblank_test.cpp
new file mode 100644
index 000000000000..f024ef67f9f6
--- /dev/null
+++ b/libc/test/src/ctype/isblank_test.cpp
@@ -0,0 +1,21 @@
+//===-- Unittests for isblank----------------------------------------------===//
+//
+// 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/isblank.h"
+#include "utils/UnitTest/Test.h"
+
+TEST(IsBlank, DefaultLocale) {
+  // Loops through all characters, verifying that space and horizontal tab
+  // return a non-zero integer and everything else returns zero.
+  for (int ch = 0; ch < 255; ++ch) {
+    if (ch == ' ' || ch == '\t')
+      EXPECT_NE(__llvm_libc::isblank(ch), 0);
+    else
+      EXPECT_EQ(__llvm_libc::isblank(ch), 0);
+  }
+}
diff --git a/libc/test/src/ctype/iscntrl_test.cpp b/libc/test/src/ctype/iscntrl_test.cpp
new file mode 100644
index 000000000000..5af7457cbda4
--- /dev/null
+++ b/libc/test/src/ctype/iscntrl_test.cpp
@@ -0,0 +1,21 @@
+//===-- Unittests for iscntrl----------------------------------------------===//
+//
+// 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/iscntrl.h"
+#include "utils/UnitTest/Test.h"
+
+TEST(IsCntrl, DefaultLocale) {
+  // Loops through all characters, verifying that control characters
+  // return a non-zero integer, all others return zero.
+  for (int ch = 0; ch < 255; ++ch) {
+    if ((0 <= ch && ch <= 0x1f /*US*/) || ch == 0x7f /*DEL*/)
+      EXPECT_NE(__llvm_libc::iscntrl(ch), 0);
+    else
+      EXPECT_EQ(__llvm_libc::iscntrl(ch), 0);
+  }
+}
diff --git a/libc/test/src/ctype/isgraph_test.cpp b/libc/test/src/ctype/isgraph_test.cpp
new file mode 100644
index 000000000000..1ed1ec7145f6
--- /dev/null
+++ b/libc/test/src/ctype/isgraph_test.cpp
@@ -0,0 +1,21 @@
+//===-- Unittests for isgraph----------------------------------------------===//
+//
+// 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/isgraph.h"
+#include "utils/UnitTest/Test.h"
+
+TEST(IsGraph, DefaultLocale) {
+  // Loops through all characters, verifying that graphical characters
+  // return a non-zero integer, everything else returns zero.
+  for (int ch = 0; ch < 255; ++ch) {
+    if ('!' <= ch && ch <= '~') // A-Z, a-z, 0-9, punctuation.
+      EXPECT_NE(__llvm_libc::isgraph(ch), 0);
+    else
+      EXPECT_EQ(__llvm_libc::isgraph(ch), 0);
+  }
+}
diff --git a/libc/test/src/ctype/ispunct_test.cpp b/libc/test/src/ctype/ispunct_test.cpp
new file mode 100644
index 000000000000..07e83fb36c7c
--- /dev/null
+++ b/libc/test/src/ctype/ispunct_test.cpp
@@ -0,0 +1,34 @@
+//===-- Unittests for ispunct----------------------------------------------===//
+//
+// 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/ispunct.h"
+#include "utils/UnitTest/Test.h"
+
+// Helper function to mark the sections of the ASCII table that are
+// punctuation characters. These are listed below:
+//  Decimal    |         Symbol
+//  -----------------------------------------
+//  33 -  47   |  ! " $ % & ' ( ) * + , - . /
+//  58 -  64   |  : ; < = > ? @
+//  91 -  96   |  [ \ ] ^ _ `
+// 123 - 126   |  { | } ~
+static inline int is_punctuation_character(int c) {
+  return ('!' <= c && c <= '/') || (':' <= c && c <= '@') ||
+         ('[' <= c && c <= '`') || ('{' <= c && c <= '~');
+}
+
+TEST(IsPunct, DefaultLocale) {
+  // Loops through all characters, verifying that punctuation characters
+  // return a non-zero integer, and everything else returns zero.
+  for (int ch = 0; ch < 255; ++ch) {
+    if (is_punctuation_character(ch))
+      EXPECT_NE(__llvm_libc::ispunct(ch), 0);
+    else
+      EXPECT_EQ(__llvm_libc::ispunct(ch), 0);
+  }
+}