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NAME

       mtext_prop_range - Find the range where the value of a text property is the same.

SYNOPSIS

       int mtext_prop_range (MText * mt, MSymbol key, int pos, int * from, int * to, int deeper)

DESCRIPTION

       Find the range where the value of a text property is the same. The mtext_prop_range()
       function investigates the extent where all characters have the same value for a text
       property. It first finds the value of the property specified by key of the character at
       pos in M-text mt.  Then it checks if adjacent characters have the same value for the
       property key.  The beginning and the end of the found range are stored to the variable
       pointed to by from and to.  The character position stored in from is inclusive but that in
       to is exclusive; this fashion is compatible with the range specification in the
       mtext_put_prop() function, etc.

       If deeper is not 0, not only the topmost but also all the stacked properties whose key is
       key are compared.

       If from is NULL, the beginning of range is not searched for. If to is NULL, the end of
       range is not searched for.

RETURN VALUE

       If the operation was successful, mtext_prop_range() returns the number of values the
       property key has at pos. Otherwise it returns -1 and assigns an error code to the external
       variable merror_code.

ERRORS

           MERROR_RANGE, MERROR_SYMBOL

SEE ALSO

           mtext_put_prop(), mtext_put_prop_values(), mtext_get_prop(), mtext_get_prop_values(),
           mtext_pop_prop(), mtext_push_prop()

COPYRIGHT

       Copyright (C) 2001 Information-technology Promotion Agency (IPA)
       Copyright (C) 2001-2011 National Institute of Advanced Industrial Science and Technology
       (AIST)
       Permission is granted to copy, distribute and/or modify this document under the terms of
       the GNU Free Documentation License <http://www.gnu.org/licenses/fdl.html>.