field_buffer man page on QNX

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form_field_buffer(3X)					 form_field_buffer(3X)

       form_field_buffer - field buffer control

       #include <form.h>
       int set_field_buffer(FIELD *field, int buf, const char *value);
       char *field_buffer(const FIELD *field, int buffer);
       int set_field_status(FIELD *field, bool status);
       bool field_status(const FIELD *field);
       int set_max_field(FIELD *field, int max);

       The  function  set_field_buffer	sets  the numbered buffer of the given
       field to contain a given string:

	  -  Buffer 0 is the displayed value of the field.

	  -  Other numbered buffers may be allocated by	 applications  through
	     the nbuf argument of (see form_field_new(3X)) but are not manipu‐
	     lated by the forms library.

       The function field_buffer returns a pointer  to	the  contents  of  the
       given numbered buffer:

	  -  The  buffer  contents always have the same length, and are padded
	     with trailing spaces as needed to ensure this length is the same.

	  -  The buffer may contain leading spaces, depending on  how  it  was

	  -  The  buffer  contents are set with set_field_buffer, or as a side
	     effect of any editing operations on the corresponding field.

	  -  Editing operations are based on the  window  which	 displays  the
	     field,  rather than a string.  The window contains only printable
	     characters, and is filled with blanks.  If you want the raw data,
	     you  must write your own routine that copies the value out of the
	     buffer and removes the leading and trailing spaces.

	  -  Because editing operations change the content of  the  buffer  to
	     correspond	 to  the  window, you should not rely on using buffers
	     for long-term storage of form data.

       The function set_field_status sets the associated status flag of field;
       field_status  gets  the	current	 value.	  The  status flag is set to a
       nonzero value whenever the field changes.

       The function set_max_field sets the maximum size for a  dynamic	field.
       An argument of 0 turns off any maximum size threshold for that field.

       The field_buffer function returns NULL on error.	 It sets errno accord‐
       ing to their success:

       E_OK The routine succeeded.

	    Routine detected an incorrect or out-of-range argument.

       The field_status function returns TRUE or FALSE.

       The remaining routines return one of the following:

       E_OK The routine succeeded.

	    System error occurred (see errno).

	    Routine detected an incorrect or out-of-range argument.

       curses(3X) and related pages whose names	 begin	"form_"	 for  detailed
       descriptions of the entry points.

       The header file <form.h> automatically includes the header file

       When  configured for wide-characters, field_buffer returns a pointer to
       temporary storage (allocated and freed by the library).	 The  applica‐
       tion  should  not  attempt to modify the data.  It will be freed on the
       next call to field_buffer to return the same buffer.  <curses.h>.

       These routines emulate the System V forms library.  They were not  sup‐
       ported on Version 7 or BSD versions.

       Juergen Pfeifer.	 Manual pages and adaptation for new curses by Eric S.

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