xref: /llvm-project/libc/test/src/ctype/isalpha_test.cpp (revision 3d94a202302d808db49646c60601e75fdcc40c14)
1 //===-- Unittests for isalpha----------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "src/__support/CPP/span.h"
10 #include "src/ctype/isalpha.h"
11 
12 #include "test/UnitTest/Test.h"
13 
14 namespace {
15 
16 // TODO: Merge the ctype tests using this framework.
17 constexpr char ALPHA_ARRAY[] = {
18     'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
19     'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
20     'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
21     'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
22 };
23 
24 bool in_span(int ch, LIBC_NAMESPACE::cpp::span<const char> arr) {
25   for (size_t i = 0; i < arr.size(); ++i)
26     if (static_cast<int>(arr[i]) == ch)
27       return true;
28   return false;
29 }
30 
31 } // namespace
32 
33 TEST(LlvmLibcIsAlpha, SimpleTest) {
34   EXPECT_NE(LIBC_NAMESPACE::isalpha('a'), 0);
35   EXPECT_NE(LIBC_NAMESPACE::isalpha('B'), 0);
36 
37   EXPECT_EQ(LIBC_NAMESPACE::isalpha('3'), 0);
38   EXPECT_EQ(LIBC_NAMESPACE::isalpha(' '), 0);
39   EXPECT_EQ(LIBC_NAMESPACE::isalpha('?'), 0);
40   EXPECT_EQ(LIBC_NAMESPACE::isalpha('\0'), 0);
41   EXPECT_EQ(LIBC_NAMESPACE::isalpha(-1), 0);
42 }
43 
44 TEST(LlvmLibcIsAlpha, DefaultLocale) {
45   // Loops through all characters, verifying that letters return a
46   // non-zero integer and everything else returns zero.
47   // TODO: encoding indep
48   for (int ch = -255; ch < 255; ++ch) {
49     if (in_span(ch, ALPHA_ARRAY))
50       EXPECT_NE(LIBC_NAMESPACE::isalpha(ch), 0);
51     else
52       EXPECT_EQ(LIBC_NAMESPACE::isalpha(ch), 0);
53   }
54 }
55