[libc] [llvm] [libc] Migrate ctype_utils to use char instead of int where applicable. (PR #166225)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- libc/src/__support/ctype_utils.h libc/src/__support/integer_to_string.h libc/src/ctype/isalnum.cpp libc/src/ctype/isalnum_l.cpp libc/src/ctype/isalpha.cpp libc/src/ctype/isalpha_l.cpp libc/src/ctype/isdigit.cpp libc/src/ctype/isdigit_l.cpp libc/src/ctype/isgraph.cpp libc/src/ctype/isgraph_l.cpp libc/src/ctype/islower.cpp libc/src/ctype/islower_l.cpp libc/src/ctype/ispunct.cpp libc/src/ctype/ispunct_l.cpp libc/src/ctype/isspace.cpp libc/src/ctype/isspace_l.cpp libc/src/ctype/isupper.cpp libc/src/ctype/isupper_l.cpp libc/src/ctype/isxdigit.cpp libc/src/ctype/isxdigit_l.cpp libc/src/ctype/tolower.cpp libc/src/ctype/tolower_l.cpp libc/src/ctype/toupper.cpp libc/src/ctype/toupper_l.cpp libc/src/stdio/printf_core/float_dec_converter_limited.h libc/src/stdio/printf_core/float_hex_converter.h libc/src/stdlib/l64a.cpp libc/src/string/strcasestr.cpp libc/src/strings/strcasecmp.cpp libc/src/strings/strcasecmp_l.cpp libc/src/strings/strncasecmp.cpp libc/src/strings/strncasecmp_l.cpp libc/test/UnitTest/MemoryMatcher.cpp libc/test/src/ctype/islower_test.cpp libc/test/src/stdlib/StrtolTest.h --diff_from_common_commit
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``````````diff
diff --git a/libc/src/ctype/isalpha.cpp b/libc/src/ctype/isalpha.cpp
index 8b6ecf192..7c874bf37 100644
--- a/libc/src/ctype/isalpha.cpp
+++ b/libc/src/ctype/isalpha.cpp
@@ -17,7 +17,7 @@ namespace LIBC_NAMESPACE_DECL {
 
 LLVM_LIBC_FUNCTION(int, isalpha, (int c)) {
   if (c < 0 || c > cpp::numeric_limits<unsigned char>::max())
-    return 0;  
+    return 0;
   return static_cast<int>(internal::isalpha(static_cast<char>(c)));
 }
 
diff --git a/libc/src/ctype/isgraph.cpp b/libc/src/ctype/isgraph.cpp
index 86ac0cb0d..b9308ecb7 100644
--- a/libc/src/ctype/isgraph.cpp
+++ b/libc/src/ctype/isgraph.cpp
@@ -17,7 +17,7 @@ namespace LIBC_NAMESPACE_DECL {
 
 LLVM_LIBC_FUNCTION(int, isgraph, (int c)) {
   if (c < 0 || c > cpp::numeric_limits<unsigned char>::max())
-    return 0;  
+    return 0;
   return static_cast<int>(internal::isgraph(static_cast<char>(c)));
 }
 
diff --git a/libc/src/ctype/isspace.cpp b/libc/src/ctype/isspace.cpp
index 908cc1196..998dbf28f 100644
--- a/libc/src/ctype/isspace.cpp
+++ b/libc/src/ctype/isspace.cpp
@@ -17,7 +17,7 @@ namespace LIBC_NAMESPACE_DECL {
 
 LLVM_LIBC_FUNCTION(int, isspace, (int c)) {
   if (c < 0 || c > cpp::numeric_limits<unsigned char>::max())
-    return 0;  
+    return 0;
   return static_cast<int>(internal::isspace(static_cast<char>(c)));
 }
 
diff --git a/libc/src/ctype/isspace_l.cpp b/libc/src/ctype/isspace_l.cpp
index dd287c633..e40765326 100644
--- a/libc/src/ctype/isspace_l.cpp
+++ b/libc/src/ctype/isspace_l.cpp
@@ -17,7 +17,7 @@ namespace LIBC_NAMESPACE_DECL {
 
 LLVM_LIBC_FUNCTION(int, isspace_l, (int c, locale_t)) {
   if (c < 0 || c > cpp::numeric_limits<unsigned char>::max())
-    return 0;  
+    return 0;
   return static_cast<int>(internal::isspace(static_cast<char>(c)));
 }
 

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https://github.com/llvm/llvm-project/pull/166225