ctype.c

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#include <ctype.h>
#include <stdbool.h>

bool mutt_isalnum(int arg)
{
  if (isascii(arg))
    return isalnum(arg);
 
  return false;
}

bool mutt_isalpha(int arg)
{
  if (isascii(arg))
    return isalpha(arg);
 
  return false;
}

bool mutt_isdigit(int arg)
{
  if (isascii(arg))
    return isdigit(arg);
 
  return false;
}

bool mutt_ispunct(int arg)
{
  if (isascii(arg))
    return ispunct(arg);
 
  return false;
}

bool mutt_isspace(int arg)
{
  if (isascii(arg))
    return isspace(arg);
 
  return false;
}

bool mutt_isxdigit(int arg)
{
  if (isascii(arg))
    return isxdigit(arg);
 
  return false;
}

int mutt_tolower(int arg)
{
  if (isascii(arg))
    return tolower(arg);
 
  return arg;
}

int mutt_toupper(int arg)
{
  if (isascii(arg))
    return toupper(arg);
 
  return arg;
}