[libc] add iswblank entrypoint (#185272)

alowqie · web-flow · commit 4fcdf5254d35 · 2026-03-11T11:18:29.000-07:00
Implement iswblank entrypoint and test for #185136
diff --git a/libc/config/baremetal/arm/entrypoints.txt b/libc/config/baremetal/arm/entrypoints.txt
@@ -304,6 +304,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.wctype.iswdigit
     libc.src.wctype.iswlower
     libc.src.wctype.iswspace
+    libc.src.wctype.iswblank
 
     # internal entrypoints
     libc.startup.baremetal.init
diff --git a/libc/config/baremetal/riscv/entrypoints.txt b/libc/config/baremetal/riscv/entrypoints.txt
@@ -301,6 +301,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.wctype.iswdigit
     libc.src.wctype.iswlower
     libc.src.wctype.iswspace
+    libc.src.wctype.iswblank
 
     # internal entrypoints
     libc.startup.baremetal.init
diff --git a/libc/config/darwin/aarch64/entrypoints.txt b/libc/config/darwin/aarch64/entrypoints.txt
@@ -107,6 +107,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.wctype.iswdigit
     libc.src.wctype.iswlower
     libc.src.wctype.iswspace
+    libc.src.wctype.iswblank
 )
 
 if(LLVM_LIBC_FULL_BUILD)
diff --git a/libc/config/linux/aarch64/entrypoints.txt b/libc/config/linux/aarch64/entrypoints.txt
@@ -374,6 +374,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.wctype.iswdigit
     libc.src.wctype.iswlower
     libc.src.wctype.iswspace
+    libc.src.wctype.iswblank
 
     # sys/uio.h entrypoints
     libc.src.sys.uio.writev
diff --git a/libc/config/linux/arm/entrypoints.txt b/libc/config/linux/arm/entrypoints.txt
@@ -199,6 +199,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.wctype.iswdigit
     libc.src.wctype.iswlower
     libc.src.wctype.iswspace
+    libc.src.wctype.iswblank
 )
 
 if(LLVM_LIBC_FULL_BUILD)
diff --git a/libc/config/linux/riscv/entrypoints.txt b/libc/config/linux/riscv/entrypoints.txt
@@ -378,6 +378,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.wctype.iswdigit
     libc.src.wctype.iswlower
     libc.src.wctype.iswspace
+    libc.src.wctype.iswblank
 
     # sys/uio.h entrypoints
     libc.src.sys.uio.writev
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
@@ -423,6 +423,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.wctype.iswdigit
     libc.src.wctype.iswlower
     libc.src.wctype.iswspace
+    libc.src.wctype.iswblank
 
     # sys/uio.h entrypoints
     libc.src.sys.uio.writev
diff --git a/libc/config/windows/entrypoints.txt b/libc/config/windows/entrypoints.txt
@@ -112,6 +112,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.wctype.iswcntrl
     libc.src.wctype.iswlower
     libc.src.wctype.iswspace
+    libc.src.wctype.iswblank
 )
 
 set(TARGET_LIBM_ENTRYPOINTS
diff --git a/libc/include/wctype.yaml b/libc/include/wctype.yaml
@@ -32,3 +32,9 @@ functions:
     return_type: int
     arguments:
       - type: wint_t
+  - name: iswblank
+    standards:
+      - stdc
+    return_type: int
+    arguments:
+      - type: wint_t
diff --git a/libc/src/wctype/CMakeLists.txt b/libc/src/wctype/CMakeLists.txt
@@ -62,3 +62,14 @@ add_entrypoint_object(
     libc.src.__support.wctype_utils
     libc.hdr.types.wint_t
 )
+
+add_entrypoint_object(
+  iswblank
+  SRCS
+    iswblank.cpp
+  HDRS
+    iswblank.h
+  DEPENDS
+    libc.src.__support.wctype_utils
+    libc.hdr.types.wint_t
+)
diff --git a/libc/src/wctype/iswblank.cpp b/libc/src/wctype/iswblank.cpp
@@ -0,0 +1,21 @@
+//===-- Implementation of iswblank ----------------------------------------===//
+//
+// 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/wctype/iswblank.h"
+#include "src/__support/common.h"
+#include "src/__support/wctype_utils.h"
+
+#include "hdr/types/wint_t.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(int, iswblank, (wint_t c)) {
+  return internal::isblank(static_cast<wchar_t>(c));
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/wctype/iswblank.h b/libc/src/wctype/iswblank.h
@@ -0,0 +1,21 @@
+//===-- Implementation header for iswblank ----------------------*- 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_WCTYPE_ISWBLANK_H
+#define LLVM_LIBC_SRC_WCTYPE_ISWBLANK_H
+
+#include "hdr/types/wint_t.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+int iswblank(wint_t c);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_WCTYPE_ISWBLANK_H
diff --git a/libc/test/src/wctype/CMakeLists.txt b/libc/test/src/wctype/CMakeLists.txt
@@ -62,3 +62,12 @@ add_libc_test(
     libc.src.wctype.iswspace
 )
 
+add_libc_test(
+  iswblank_test
+  SUITE
+    libc_wctype_unittests
+  SRCS
+    iswblank_test.cpp
+  DEPENDS
+    libc.src.wctype.iswblank
+)
diff --git a/libc/test/src/wctype/iswblank_test.cpp b/libc/test/src/wctype/iswblank_test.cpp
@@ -0,0 +1,23 @@
+//===-- Unittests for iswblank --------------------------------------------===//
+//
+// 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/wctype/iswblank.h"
+
+#include "test/UnitTest/Test.h"
+
+TEST(LlvmLibciswblank, SimpleTest) {
+  EXPECT_NE(LIBC_NAMESPACE::iswblank(' '), 0);
+  EXPECT_NE(LIBC_NAMESPACE::iswblank('\t'), 0);
+
+  EXPECT_EQ(LIBC_NAMESPACE::iswblank('a'), 0);
+  EXPECT_EQ(LIBC_NAMESPACE::iswblank('\n'), 0);
+  EXPECT_EQ(LIBC_NAMESPACE::iswblank('3'), 0);
+  EXPECT_EQ(LIBC_NAMESPACE::iswblank('?'), 0);
+  EXPECT_EQ(LIBC_NAMESPACE::iswblank('\0'), 0);
+  EXPECT_EQ(LIBC_NAMESPACE::iswblank(-1), 0);
+}

Original file line number	Diff line number	Diff line change
`@@ -107,6 +107,7 @@ set(TARGET_LIBC_ENTRYPOINTS`
`107`	`107`	`libc.src.wctype.iswdigit`
`108`	`108`	`libc.src.wctype.iswlower`
`109`	`109`	`libc.src.wctype.iswspace`
	`110`	`+ libc.src.wctype.iswblank`
`110`	`111`	`)`
`111`	`112`
`112`	`113`	`if(LLVM_LIBC_FULL_BUILD)`
Original file line number	Diff line number	Diff line change
`@@ -199,6 +199,7 @@ set(TARGET_LIBC_ENTRYPOINTS`
`199`	`199`	`libc.src.wctype.iswdigit`
`200`	`200`	`libc.src.wctype.iswlower`
`201`	`201`	`libc.src.wctype.iswspace`
	`202`	`+ libc.src.wctype.iswblank`
`202`	`203`	`)`
`203`	`204`
`204`	`205`	`if(LLVM_LIBC_FULL_BUILD)`
Original file line number	Diff line number	Diff line change
`@@ -112,6 +112,7 @@ set(TARGET_LIBC_ENTRYPOINTS`
`112`	`112`	`libc.src.wctype.iswcntrl`
`113`	`113`	`libc.src.wctype.iswlower`
`114`	`114`	`libc.src.wctype.iswspace`
	`115`	`+ libc.src.wctype.iswblank`
`115`	`116`	`)`
`116`	`117`
`117`	`118`	`set(TARGET_LIBM_ENTRYPOINTS`