XmTextGetSubstring(3X)

     NAME
          XmTextGetSubstring - A Text function that retrieves a copy
          of a portion of the internal text buffer

     SYNOPSIS
          #include <Xm/Text.h>

          int XmTextGetSubstring (widget, start, num_chars, buffer_size, buffer)
               Widget      widget;
               XmTextPositionstart;
               int         num_chars;
               int         buffer_size;
               char        *buffer;

     DESCRIPTION
          XmTextGetSubstring retrieves a copy of a portion of the
          internal text buffer of a Text widget.  The function copies
          a specified number of characters from a given start position
          in the internal text buffer into a buffer provided by the
          application.  A NULL terminator is placed at the end of the
          copied data.

          The size of the required buffer depends on the maximum
          number of bytes per character (MB_CUR_MAX) for the current
          locale.  MB_CUR_MAX is a macro defined in stdlib.h.  The
          buffer should be large enough to contain the substring to be
          copied and a NULL terminator.  Use the following equation to
          calculate the size of buffer the application should provide:

          buffer_size = (num_chars * MB_CUR_MAX) + 1

          widget
               Specifies the Text widget ID.

          start
               Specifies the beginning character position from which
               the data will be retrieved.  This is an integer number
               of characters from the beginning of the text buffer.
               The first character position is 0.

          num_chars
               Specifies the number of characters to be copied into
               the provided buffer.

          buffer_size
               Specifies the size of the supplied buffer in bytes.
               This size should account for a NULL terminator.

          buffer
               Specifies the character buffer into which the internal
               text buffer will be copied.
          For a complete definition of Text and its associated
          resources, see XmText(3X).

     RETURN VALUE
          XmCOPY_SUCCEEDED
               The function was successful.

          XmCOPY_FAILED
               The function failed because it was unable to copy the
               specified number of characters into the buffer
               provided.  The buffer size may be insufficient.  The
               contents of buffer are undefined.

          XmCOPY_TRUNCATED
               The requested number of characters extended beyond the
               internal buffer.  The function copied characters
               between start and the end of the widget's buffer and
               terminated the string with a NULL terminator; fewer
               than num_chars characters were copied.

     RELATED INFORMATION
          XmText(3X) and XmTextGetSubstringWcs(3X).