form_driver - form library
library ``libform''
#include <form.h>
int
form_driver(FORM *form, int request);
The form_driver() is the heart of the forms library, it takes commands in
the request parameter that is either a request to the driver to perform
some action or is a character to be inserted into the current field. The
form driver will attempt to insert any printable character passed to it
into the current field. This may or may not succeed depending on the
state of the current field. If the character passed is not printable
then the driver attempts to process it as a driver request. If the character
passed is not a valid request then the driver will return an
unknown command error.
The forms driver recognises the following requests:
REQ_NEXT_PAGE Change to the next page in the form.
REQ_PREV_PAGE Change to the previous page in the form.
REQ_FIRST_PAGE Select the first page in the form.
REQ_LAST_PAGE Go to the last page in the form.
REQ_NEXT_FIELD Move to the next field in the form field array.
REQ_PREV_FIELD Move to the previous field in the form field array.
REQ_FIRST_FIELD Go to the first field in the form field array.
REQ_LAST_FIELD Go to the last field in the form field array.
REQ_SNEXT_FIELD Move to the next sorted field on the form.
REQ_SPREV_FIELD Move to the previous sorted field on the form.
REQ_SFIRST_FIELD Go to the first field in the sorted list.
REQ_SLAST_FIELD Move to the last field in the sorted list.
REQ_LEFT_FIELD Go one field to the left on the form page.
REQ_RIGHT_FIELD Go one field to the right on the form page.
REQ_UP_FIELD Go up one field on the form page.
REQ_DOWN_FIELD Go down one field on the form page.
REQ_NEXT_CHAR Move one char to the right within the field
REQ_PREV_CHAR Move one char to the left within the current field.
REQ_NEXT_LINE Go down one line in the current field.
REQ_PREV_LINE Go up one line in the current field.
REQ_NEXT_WORD Go forward one word in the current field
REQ_PREV_WORD Go backward one word in the current field.
REQ_BEG_FIELD Move the cursor to the beginning of the current field.
REQ_END_FIELD Move the cursor to the end of the current field.
REQ_BEG_LINE Move the cursor to the beginning of the line in the
current field.
REQ_END_LINE Move the cursor to the end of the line.
REQ_LEFT_CHAR Move the cursor left one character
REQ_RIGHT_CHAR Move the cursor right one character
REQ_UP_CHAR Move the cursor up one line.
REQ_DOWN_CHAR Move the cursor down one line.
REQ_NEW_LINE Insert a new line at the current cursor position.
REQ_INS_CHAR Insert a blank character at the current cursor position
REQ_INS_LINE Open a blank line at the current cursor position.
REQ_DEL_CHAR Delete the character at the currrent cursor position.
REQ_DEL_PREV Delete the character to the left of the current cursor
position.
REQ_DEL_LINE Delete the current line.
REQ_DEL_WORD Delete the word at the current cursor position.
REQ_CLR_EOL Clear the field from the current cursor position to the
end of the current line.
REQ_CLR_EOF Clear the field from the current cursor position to the
end of the field.
REQ_CLR_FIELD Clear the field.
REQ_OVL_MODE Enter overlay mode, characters added to the field will
replace the ones already there.
REQ_INS_MODE Enter insert mode, characters will be inserted at the
current cursor position. Any characters to the right
of the cursor will be moved right to accomodate the new
characters.
REQ_SCR_FLINE Scroll the field forward one line.
REQ_SCR_BLINE Scroll the field backward one line.
REQ_SCR_FPAGE Scroll the field forward one field page.
REQ_SCR_BPAGE Scroll the field backward one field page.
REQ_SCR_FHPAGE Scroll the field forward half one field page.
REQ_SCR_BHPAGE Scroll the field backward half one field page.
REQ_SCR_FCHAR Scroll the field horizontally forward one character
REQ_SCR_BCHAR Scroll the field horizontally backward one character
REQ_SCR_HFLINE Scroll the field horizontally forward one field line.
REQ_SCR_HBLINE Scroll the field horizontally backward one field line.
REQ_SCR_HFHALF Scroll the field horizontally forward half a field
line.
REQ_SCR_HBHALF Scroll the field horizontally backward half a field
line.
REQ_VALIDATION Request the contents of the current field be validated
using any field validation function that has been set
for the field. Normally, the field is validated before
the current field changes. This request allows the
current field to be validated.
REQ_PREV_CHOICE Select the previous choice in an enumerated type field.
REQ_NEXT_CHOICE Select the next choice in an enumerated type field.
Functions returning pointers will return NULL if an error is detected.
The functions that return an int will return one of the following error
values:
E_OK The function was successful.
E_REQUEST_DENIED The forms driver request could not be fulfilled
E_UNKNOWN_COMMAND The passed character is not a printable character and
is not a valid forms driver request.
E_BAD_ARGUMENT A bad argument was passed to the forms driver.
E_INVALID_FIELD The form passed to the driver has no valid attached
fields.
E_NOT_POSTED The given form is not currently posted to the screen.
E_BAD_STATE The forms driver was called from within an init or
term function.
E_INVALID_FIELD The character passed to the forms driver fails the
character validation for the current field.
curses(3), forms(3)
Field sorting is done by location of the field on the form page, the
fields are sorted by position starting with the top-most, left-most field
and progressing left to right. For the purposes of sorting, the fields
top left corner is used as the sort criteria. The header <form.h> automatically
includes both <curses.h> and <eti.h>.
BSD January 1, 2001 BSD
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