X-Git-Url: https://pd.if.org/git/?p=pdclib;a=blobdiff_plain;f=includes%2Fctype.h;h=a4ac53449bfd52e529860d95358dbe24ccf7d24e;hp=2c8071c5da3b39eb08f1ba72d2b8d3eacc98345e;hb=0fa6394bc70eab55e0e38703a31a3072232c0729;hpb=3d73330dba39a534ae569ca053fe626e670efd4d

diff --git a/includes/ctype.h b/includes/ctype.h
index 2c8071c..a4ac534 100644
--- a/includes/ctype.h
+++ b/includes/ctype.h
@@ -9,15 +9,85 @@
 #ifndef _PDCLIB_CTYPE_H
 #define _PDCLIB_CTYPE_H _PDCLIB_CTYPE_H
 
-/* ------------------------------------------------------------------------- */
-/*  THIS IS A STUB  -  THIS IS A STUB  -  THIS IS A STUB  -  THIS IS A STUB  */
-/* ------------------------------------------------------------------------- */
-/* This implements two functions that are required by <stdlib.h> / <stdio.h> */
-/* for the C locale only. Will be replaced in v0.6 by something compliant.   */
-/* ------------------------------------------------------------------------- */
-
-int tolower( int c );
+/* Character classification functions */
+
+/* Note that there is a difference between "whitespace" (any printing, non-
+   graph character, like horizontal and vertical tab), and "blank" (the literal
+   ' ' space character).
+
+   There will be masking macros for each of these later on, but right now I
+   focus on the functions only.
+*/
+
+/* Returns isalpha( c ) || isdigit( c ) */
+int isalnum( int c );
+
+/* Returns isupper( c ) || islower( c ) in the "C" locale.
+   In any other locale, also returns true for a locale-specific set of
+   alphabetic characters which are neither control characters, digits,
+   punctation, or whitespace.
+*/
+int isalpha( int c );
+
+/* Returns true if the character is a whitespace. In the "C" locale, only ' '
+   and '\t' are considered whitespace.
+*/
+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. */
+int isdigit( int c );
+
+/* Returns true for every printing character except space (' '). */
+int isgraph( int c );
+
+/* Returns true for lowercase letters in the "C" locale.
+   In any other locale, also returns true for a locale-specific set of
+   characters which are neither control characters, digits, punctation, or
+   space (' '). In a locale other than the "C" locale, a character might test
+   true for both islower() and isupper().
+*/
+int islower( int c );
+
+/* Returns true for every printing character including space (' '). */
+int isprint( int c );
+
+/* Returns true for every printing character that is neither whitespace
+   nor alphanumeric in the "C" locale. In any other locale, there might be
+   characters that are printing characters, but neither whitespace nor
+   alphanumeric.
+*/
+int ispunct( int c );
+
+/* Returns true for every standard whitespace character (' ', '\f', '\n', '\r',
+   '\t', '\v') in the "C" locale. In any other locale, also returns true for a
+   locale-specific set of characters for which isalnum() is false.
+*/ 
 int isspace( int c );
 
-#endif
+/* Returns true for uppercase letters in the "C" locale.
+   In any other locale, also returns true for a locale-specific set of
+   characters which are neither control characters, digits, punctation, or
+   space (' '). In a locale other than the "C" locale, a character might test
+   true for both islower() and isupper().
+*/
+int isupper( int c );
+
+/* Returns true for any hexadecimal-digit character. */
+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 );
+
+/* Converts a lowercase letter to a corresponding uppercase letter. Input that
+   is not a lowercase letter remains unchanged.
+*/
+int toupper( c );
+
+#endif