libc/src/ctype/ctype_utils.h

   1 //===-- Collection of utils for implementing ctype functions-------*-C++-*-===//
   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 #ifndef LLVM_LIBC_SRC_CTYPE_CTYPE_UTILS_H
  10 #define LLVM_LIBC_SRC_CTYPE_CTYPE_UTILS_H
  11
  12 namespace __llvm_libc {
  13 namespace internal {
  14
  15 // ------------------------------------------------------
  16 // Rationale: Since these classification functions are
  17 // called in other functions, we will avoid the overhead
  18 // of a function call by inlining them.
  19 // ------------------------------------------------------
  20
  21 static inline int isalpha(unsigned ch) { return (ch | 32) - 'a' < 26; }
  22
  23 static inline int isdigit(unsigned ch) { return (ch - '0') < 10; }
  24
  25 static inline int isalnum(unsigned ch) { return isalpha(ch) || isdigit(ch); }
  26
  27 static inline int isgraph(unsigned ch) { return 0x20 < ch && ch < 0x7f; }
  28
  29 static inline int islower(unsigned ch) { return (ch - 'a') < 26; }
  30
  31 static inline int isupper(unsigned ch) { return (ch - 'A') < 26; }
  32
  33 } // namespace internal
  34 } // namespace __llvm_libc
  35
  36 #endif //  LLVM_LIBC_SRC_CTYPE_CTYPE_UTILS_H