#
# Id: api.txt,v 1.3 2001/01/02 18:46:20 mleisher Exp 
#

                             The MUTT UCData API
                             -------------------


####
NOTE: This library has been customized for use with OpenLDAP. The character
data tables are hardcoded into the library and the load/unload/reload
functions are no-ops. Also, the MUTT API claimed to be compatible with
John Cowan's library but its ucnumber behavior was broken. This has been
fixed in the OpenLDAP release.

By default, the implementation specific properties in MUTTUCData.txt are
not incorporated into the OpenLDAP build. You can supply them to ucgendat
and recreate uctable.h if you need them.
  -- hyc@openldap.org
####


-----------------------------------------------------------------------------

Macros that combine to select data tables for ucdata_load(), ucdata_unload(),
and ucdata_reload().

#define UCDATA_CASE   0x01
#define UCDATA_CTYPE  0x02
#define UCDATA_DECOMP 0x04
#define UCDATA_CMBCL  0x08
#define UCDATA_NUM    0x10
#define UCDATA_COMP   0x20
#define UCATA_ALL (UCDATA_CASE|UCDATA_CTYPE|UCDATA_DECOMP|\
                   UCDATA_CMBCL|UCDATA_NUM|UCDATA_COMP)
-----------------------------------------------------------------------------

void ucdata_load(char *paths, int masks)

  This function initializes the UCData library by locating the data files in
  one of the colon-separated directories in the `paths' parameter.  The data
  files to be loaded are specified in the `masks' parameter as a bitwise
  combination of the macros listed above.

  This should be called before using any of the other functions.

  NOTE: the ucdata_setup(char *paths) function is now a macro that expands
        into this function at compile time.

-----------------------------------------------------------------------------

void ucdata_unload(int masks)

  This function unloads the data tables specified in the `masks' parameter.

  This function should be called when the application is done using the UCData
  package.

  NOTE: the ucdata_cleanup() function is now a macro that expands into this
        function at compile time.

-----------------------------------------------------------------------------

void ucdata_reload(char *paths, int masks)

  This function reloads the data files from one of the colon-separated
  directories in the `paths' parameter.  The data files to be reloaded are
  specified in the `masks' parameter as a bitwise combination of the macros
  listed above.

  If the data files have already been loaded, they are unloaded before the
  data files are loaded again.

-----------------------------------------------------------------------------

int ucdecomp(unsigned long code, unsigned long *num, unsigned long **decomp)

  This function determines if a character has a decomposition and returns the
  decomposition information if it exists.

  If a zero is returned, there is no decomposition.  If a non-zero is
  returned, then the `num' and `decomp' variables are filled in with the
  appropriate values.

  Example call:

    unsigned long i, num, *decomp;

    if (ucdecomp(0x1d5, &num, &decomp) != 0) {
       for (i = 0; i < num; i++)
         printf("0x%08lX,", decomp[i]);
       putchar('\n');
    }

int uccanondecomp(const unsigned long *in, int inlen, unsigned long **out,
                  int *outlen)

  This function decomposes an input string and does canonical reordering of
  the characters at the same time.

  If a -1 is returned, memory allocation was not successful.  If a zero is
  returned, no decomposition occurred.  Any other value means the output string
  contains the fully decomposed string in canonical order.

  If the "outlen" parameter comes back with a value > 0, then the string
  returned in the "out" parameter needs to be deallocated by the caller. 

-----------------------------------------------------------------------------

int ucdecomp_hangul(unsigned long code, unsigned long *num,
                    unsigned long decomp[])

  This function determines if a Hangul syllable has a decomposition and
  returns the decomposition information.

  An array of at least size 3 should be passed to the function for the
  decomposition of the syllable.

  If a zero is returned, the character is not a Hangul syllable.  If a
  non-zero is returned, the `num' field will be 2 or 3 and the syllable will
  be decomposed into the `decomp' array arithmetically.

  Example call:

    unsigned long i, num, decomp[3];

    if (ucdecomp_hangul(0xb1ba, &num, &decomp) != 0) {
       for (i = 0; i < num; i++)
         printf("0x%08lX,", decomp[i]);
       putchar('\n');
    }

-----------------------------------------------------------------------------

int uccomp(unsigned long ch1, unsigned long ch2, unsigned long *comp)

  This function takes a pair of characters and determines if they combine to
  form another character.

  If a zero is returned, no composition is formed by the character pair.  Any
  other value indicates the "comp" parameter has a value.

int uccomp_hangul(unsigned long *str, int len)

  This function composes the Hangul Jamo in the string.  The composition is
  done in-place.

  The return value provides the new length of the string.  This will be
  smaller than "len" if compositions occurred.

int uccanoncomp(unsigned long *str, int len)

  This function does a canonical composition of characters in the string.

  The return value is the new length of the string.

-----------------------------------------------------------------------------

struct ucnumber {
  int numerator;
  int denominator;
};

int ucnumber_lookup(unsigned long code, struct ucnumber *num)

  This function determines if the code is a number and fills in the `num'
  field with the numerator and denominator.  If the code happens to be a
  single digit, the denominator field will be 1.

####
The original code would set numerator = denominator for regular digits.
However, the Readme also claimed to be compatible with John Cowan's uctype
library, but this behavior is both nonsensical and incompatible with the
Cowan library. As such, it has been fixed here as described above.
  -- hyc@openldap.org
####

  If the function returns 0, the code is not a number.  Any other return
  value means the code is a number.

int ucdigit_lookup(unsigned long code, int *digit)

  This function determines if the code is a digit and fills in the `digit'
  field with the digit value.

  If the function returns 0, the code is not a number.  Any other return
  value means the code is a number.

struct ucnumber ucgetnumber(unsigned long code)

  This is a compatibility function with John Cowan's "uctype" package.  It
  uses ucnumber_lookup().

int ucgetdigit(unsigned long code)

  This is a compatibility function with John Cowan's "uctype" package.  It
  uses ucdigit_lookup().

-----------------------------------------------------------------------------

unsigned long uctoupper(unsigned long code)

  This function returns the code unchanged if it is already upper case or has
  no upper case equivalent.  Otherwise the upper case equivalent is returned.

-----------------------------------------------------------------------------

unsigned long uctolower(unsigned long code)

  This function returns the code unchanged if it is already lower case or has
  no lower case equivalent.  Otherwise the lower case equivalent is returned.

-----------------------------------------------------------------------------

unsigned long uctotitle(unsigned long code)

  This function returns the code unchanged if it is already title case or has
  no title case equivalent.  Otherwise the title case equivalent is returned.

-----------------------------------------------------------------------------

int ucisalpha(unsigned long code)
int ucisalnum(unsigned long code)
int ucisdigit(unsigned long code)
int uciscntrl(unsigned long code)
int ucisspace(unsigned long code)
int ucisblank(unsigned long code)
int ucispunct(unsigned long code)
int ucisgraph(unsigned long code)
int ucisprint(unsigned long code)
int ucisxdigit(unsigned long code)

int ucisupper(unsigned long code)
int ucislower(unsigned long code)
int ucistitle(unsigned long code)

  These functions (actually macros) determine if a character has these
  properties.  These behave in a fashion very similar to the venerable ctype
  package.

-----------------------------------------------------------------------------

int ucisisocntrl(unsigned long code)

  Is the character a C0 control character (< 32) ?

int ucisfmtcntrl(unsigned long code)

  Is the character a format control character?

int ucissymbol(unsigned long code)

  Is the character a symbol?

int ucisnumber(unsigned long code)

  Is the character a number or digit?

int ucisnonspacing(unsigned long code)

  Is the character non-spacing?

int ucisopenpunct(unsigned long code)

  Is the character an open/left punctuation (i.e. '[')

int ucisclosepunct(unsigned long code)

  Is the character an close/right punctuation (i.e. ']')

int ucisinitialpunct(unsigned long code)

  Is the character an initial punctuation (i.e. U+2018 LEFT SINGLE QUOTATION
  MARK)

int ucisfinalpunct(unsigned long code)

  Is the character a final punctuation (i.e. U+2019 RIGHT SINGLE QUOTATION
  MARK)

int uciscomposite(unsigned long code)

  Can the character be decomposed into a set of other characters?

int ucisquote(unsigned long code)

  Is the character one of the many quotation marks?

int ucissymmetric(unsigned long code)

  Is the character one that has an opposite form (i.e. <>)

int ucismirroring(unsigned long code)

  Is the character mirroring (superset of symmetric)?

int ucisnonbreaking(unsigned long code)

  Is the character non-breaking (i.e. non-breaking space)?

int ucisrtl(unsigned long code)

  Does the character have strong right-to-left directionality (i.e. Arabic
  letters)?

int ucisltr(unsigned long code)

  Does the character have strong left-to-right directionality (i.e. Latin
  letters)?

int ucisstrong(unsigned long code)

  Does the character have strong directionality?

int ucisweak(unsigned long code)

  Does the character have weak directionality (i.e. numbers)?

int ucisneutral(unsigned long code)

  Does the character have neutral directionality (i.e. whitespace)?

int ucisseparator(unsigned long code)

  Is the character a block or segment separator?

int ucislsep(unsigned long code)

  Is the character a line separator?

int ucispsep(unsigned long code)

  Is the character a paragraph separator?

int ucismark(unsigned long code)

  Is the character a mark of some kind?

int ucisnsmark(unsigned long code)

  Is the character a non-spacing mark?

int ucisspmark(unsigned long code)

  Is the character a spacing mark?

int ucismodif(unsigned long code)

  Is the character a modifier letter?

int ucismodifsymbol(unsigned long code)

  Is the character a modifier symbol?

int ucisletnum(unsigned long code)

  Is the character a number represented by a letter?

int ucisconnect(unsigned long code)

  Is the character connecting punctuation?

int ucisdash(unsigned long code)

  Is the character dash punctuation?

int ucismath(unsigned long code)

  Is the character a math character?

int uciscurrency(unsigned long code)

  Is the character a currency character?

int ucisenclosing(unsigned long code)

  Is the character enclosing (i.e. enclosing box)?

int ucisprivate(unsigned long code)

  Is the character from the Private Use Area?

int ucissurrogate(unsigned long code)

  Is the character one of the surrogate codes?

int ucisdefined(unsigned long code)

  Is the character defined (appeared in one of the data files)?

int ucisundefined(unsigned long code)

  Is the character not defined (non-Unicode)?

int ucishan(unsigned long code)

  Is the character a Han ideograph?

int ucishangul(unsigned long code)

  Is the character a pre-composed Hangul syllable?