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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 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 opera-tions operations
             tions 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.

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 <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 application 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 supported on Version 7 or BSD ver-sions. versions.
       sions.

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



                                                                                       form_field_buffer(3X)