form_field_buffer man page on YellowDog

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form_field_buffer(3X)					 form_field_buffer(3X)

NAME
       form_field_buffer - field buffer control

SYNOPSIS
       #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);

DESCRIPTION
       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
       manipulated  by	the  forms library.  The function field_buffer returns
       the address of the buffer.  Please note that this buffer has always the
       length of the buffer, that means that it may typically contain trailing
       spaces. If you entered leading spaces the buffer may also contain them.
       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  spa‐
       ces.  Please  note  also,  that	subsequent operations on the form will
       probably change the content of the buffer. So do not use	 it  for  long
       term storage of the entered 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.

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

       E_OK The routine succeeded.

       E_BAD_ARGUMENT
	    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.

       E_SYSTEM_ERROR
	    System error occurred (see errno).

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

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

NOTES
       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>.

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

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

							 form_field_buffer(3X)
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