zircon/kernel/lib/libc/ctype.cc

// Copyright 2016 The Fuchsia Authors
// Copyright (c) 2008 Travis Geiselbrecht
//
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file or at
// https://opensource.org/licenses/MIT

#include <ctype.h>

int isblank(int c) { return (c == ' ' || c == '\t'); }

int isspace(int c) {
  return (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v');
}

int islower(int c) { return ((c >= 'a') && (c <= 'z')); }

int isupper(int c) { return ((c >= 'A') && (c <= 'Z')); }

int isdigit(int c) { return ((c >= '0') && (c <= '9')); }

int isalpha(int c) { return isupper(c) || islower(c); }

int isalnum(int c) { return isalpha(c) || isdigit(c); }

int isxdigit(int c) {
  return isdigit(c) || ((c >= 'a') && (c <= 'f')) || ((c >= 'A') && (c <= 'F'));
}

int isgraph(int c) { return ((c > ' ') && (c < 0x7f)); }

int iscntrl(int c) { return ((c < ' ') || (c == 0x7f)); }

int isprint(int c) { return ((c >= 0x20) && (c < 0x7f)); }

int ispunct(int c) { return isgraph(c) && (!isalnum(c)); }

int tolower(int c) {
  if ((c >= 'A') && (c <= 'Z'))
    return c + ('a' - 'A');
  return c;
}

int toupper(int c) {
  if ((c >= 'a') && (c <= 'z'))
    return c + ('A' - 'a');
  return c;
}