form_driver man page on Ultrix

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form_driver(3X)						       form_driver(3X)

NAME
       form_driver - command-processing loop of the form system

SYNOPSIS
       #include <form.h>
       int form_driver(FORM *form, int c);

DESCRIPTION
       Once a form has been posted (displayed), you should funnel input events
       to it through form_driver.  This routine has  two  major	 input	cases;
       either the input is a form navigation request or it's a printable ASCII
       character.  The form driver requests are as follows:

       REQ_NEXT_PAGE
	    Move to the next page.

       REQ_PREV_PAGE
	    Move to the previous page.

       REQ_FIRST_PAGE
	    Move to the first page.

       REQ_LAST_PAGE
	    Move to the last field.

       REQ_NEXT_FIELD
	    Move to the next field.

       REQ_PREV_FIELD
	    Move to the previous field.

       REQ_FIRST_FIELD
	    Move to the first field.

       REQ_LAST_FIELD
	    Move to the last field.

       REQ_SNEXT_FIELD
	    Move to the sorted next field.

       REQ_SPREV_FIELD
	    Move to the sorted previous field.

       REQ_SFIRST_FIELD
	    Move to the sorted first field.

       REQ_SLAST_FIELD
	    Move to the sorted last field.

       REQ_LEFT_FIELD
	    Move left to a field.

       REQ_RIGHT_FIELD
	    Move right to a field.

       REQ_UP_FIELD
	    Move up to a field.

       REQ_DOWN_FIELD
	    Move down to a field.

       REQ_NEXT_CHAR
	    Move to the next char.

       REQ_PREV_CHAR
	    Move to the previous char.

       REQ_NEXT_LINE
	    Move to the next line.

       REQ_PREV_LINE
	    Move to the previous line.

       REQ_NEXT_WORD
	    Move to the next word.

       REQ_PREV_WORD
	    Move to the previous word.

       REQ_BEG_FIELD
	    Move to the beginning of the field.

       REQ_END_FIELD
	    Move to the end of the field.

       REQ_BEG_LINE
	    Move to the beginning of the line.

       REQ_END_LINE
	    Move to the end of the line.

       REQ_LEFT_CHAR
	    Move left in the field.

       REQ_RIGHT_CHAR
	    Move right in the field.

       REQ_UP_CHAR
	    Move up in the field.

       REQ_DOWN_CHAR
	    Move down in the field.

       REQ_NEW_LINE
	    Insert or overlay a new line.

       REQ_INS_CHAR
	    Insert a blank at the cursor.

       REQ_INS_LINE
	    Insert a blank line at the cursor.

       REQ_DEL_CHAR
	    Delete character at the cursor.

       REQ_DEL_PREV
	    Delete character before the cursor.

       REQ_DEL_LINE
	    Delete line at the cursor.

       REQ_DEL_WORD
	    Delete blank-delimited word at the cursor.

       REQ_CLR_EOL
	    Clear to end of line from cursor.

       REQ_CLR_EOF
	    Clear to end of field from cursor.

       REQ_CLR_FIELD
	    Clear the entire field.

       REQ_OVL_MODE
	    Enter overlay mode.

       REQ_INS_MODE
	    Enter insert mode.

       REQ_SCR_FLINE
	    Scroll the field forward a line.

       REQ_SCR_BLINE
	    Scroll the field backward a line.

       REQ_SCR_FPAGE
	    Scroll the field forward a page.

       REQ_SCR_BPAGE
	    Scroll the field backward a page.

       REQ_SCR_FHPAGE
	    Scroll the field forward half a page.

       REQ_SCR_BHPAGE
	    Scroll the field backward half a page.

       REQ_SCR_FCHAR
	    Scroll the field forward a character.

       REQ_SCR_BCHAR
	    Scroll the field backward a character.

       REQ_SCR_HFLINE
	    Horizontal scroll the field forward a line.

       REQ_SCR_HBLINE
	    Horizontal scroll the field backward a line.

       REQ_SCR_HFHALF
	    Horizontal scroll the field forward half a line.

       REQ_SCR_HBHALF
	    Horizontal scroll the field backward half a line.

       REQ_VALIDATION
	    Validate field.

       REQ_NEXT_CHOICE
	    Display next field choice.

       REQ_PREV_CHOICE
	    Display previous field choice.

       If the second argument is  a  printable	ASCII  character,  the	driver
       places  it  in the current position in the current field.  If it is one
       of the forms requests listed above, that request is executed.

       If the second argument is neither printable ASCII nor one of the	 above
       pre-defined  form requests, the drive assumes it is an application-spe‐
       cific command and returns E_UNKNOWN_COMMAND.  Application-defined  com‐
       mands  should  be defined relative to MAX_COMMAND, the maximum value of
       these pre-defined requests.

RETURN VALUE
       form_driver return one of the following error codes:

       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.

       E_BAD_STATE
	    Routine was called from an initialization or termination function.

       E_NOT_POSTED
	    The form has not been posted.

       E_UNKNOWN_COMMAND
	    The form driver code saw an unknown request code.

       E_INVALID_FIELD
	    Contents of field is invalid.

       E_REQUEST_DENIED
	    The form driver could not process the request.

SEE ALSO
       curses(3X), form(3X).

NOTES
       The header  file	 <form.h>  automatically  includes  the	 header	 files
       <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_driver(3X)
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