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Last update Sun Jul 22 16:19:28 2007

# std.ctype

Simple ASCII character classification functions. For Unicode classification, see std.uni.
References:
ASCII Table, Wikipedia

int isalnum(dchar c);
  Returns !=0 if c is a letter in the range (0..9, a..z, A..Z).
int isalpha(dchar c);
  Returns !=0 if c is an ascii upper or lower case letter.
int iscntrl(dchar c);
  Returns !=0 if c is a control character.
int isdigit(dchar c);
  Returns !=0 if c is a digit.
int islower(dchar c);
  Returns !=0 if c is lower case ascii letter.
int ispunct(dchar c);
  Returns !=0 if c is a punctuation character.
int isspace(dchar c);
  Returns !=0 if c is a space, tab, vertical tab, form feed, carriage return, or linefeed.
int isupper(dchar c);
  Returns !=0 if c is an upper case ascii character.
int isxdigit(dchar c);
  Returns !=0 if c is a hex digit (0..9, a..f, A..F).
int isgraph(dchar c);
  Returns !=0 if c is a printing character except for the space character.
int isprint(dchar c);
  Returns !=0 if c is a printing character including the space character.
int isascii(dchar c);
  Returns !=0 if c is in the ascii character set, i.e. in the range 0..0x7F.
dchar tolower(dchar c);
  If c is an upper case ascii character, return the lower case equivalent, otherwise return c.
dchar toupper(dchar c);
  If c is a lower case ascii character, return the upper case equivalent, otherwise return c.

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