#ifndef _PDCLIB_CTYPE_H
#define _PDCLIB_CTYPE_H _PDCLIB_CTYPE_H
+#include <_PDCLIB_int.h>
+_PDCLIB_BEGIN_EXTERN_C
/* Character classification functions */
*/
int isalpha( int c );
-/* Returns true if the character is a whitespace. In the "C" locale, only ' '
- and '\t' are considered whitespace.
+/* Returns true if the character isspace() and used for seperating words within
+ a line of text. In the "C" locale, only ' ' and '\t' are considered blanks.
*/
int isblank( int c );
/* Returns true if the character is a control character. */
int iscntrl( int c );
-/* Returns true if the character is a decimal digit. */
+/* Returns true if the character is a decimal digit. Locale-independent. */
int isdigit( int c );
/* Returns true for every printing character except space (' '). */
*/
int isupper( int c );
-/* Returns true for any hexadecimal-digit character. */
+/* Returns true for any hexadecimal-digit character. Locale-independent. */
int isxdigit( int c );
/* Character case mapping functions */
/* Converts an uppercase letter to a corresponding lowercase letter. Input that
is not an uppercase letter remains unchanged.
*/
-int tolower( c );
+int tolower( int c );
/* Converts a lowercase letter to a corresponding uppercase letter. Input that
is not a lowercase letter remains unchanged.
*/
-int toupper( c );
+int toupper( int c );
+_PDCLIB_END_EXTERN_C
#endif