Manual Pages for UNIX Operating System command usage for man field_buffer

Miscellaneous Library Functions             form_field_buffer(3X)



NAME
     form_field_buffer - field buffer control

SYNOPSIS
     #include 
     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  applica-
           tions    through    the    nbuf   argument   of   (see
           form_field_new(3X)) but are  not  manipulated  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 set.

        -  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



SunOS 5.10                Last change:                          1






Miscellaneous Library Functions             form_field_buffer(3X)



     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 according 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  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 application should not attempt to modify  the
     data.   It will be freed on the next call to field_buffer to
     return the same buffer.  .

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

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







SunOS 5.10                Last change:                          2