form_driver(3X)                                             form_driver(3X)


   NAME
         formdriver - command processor for the forms subsystem

   SYNOPSIS
         #include <form.h>

         int formdriver(FORM *form, int c);

   DESCRIPTION
         formdriver is the workhorse of the forms subsystem; it checks to
         determine whether the character c is a forms request or data.  If it
         is a request, the form driver executes the request and reports the
         result.  If it is data (a printable ASCII character), it enters the
         data into the current position in the current field.  If it is not
         recognized, the form driver assumes it is an application-defined
         command and returns EUNKNOWNCOMMAND.  Application defined commands
         should be defined relative to MAXCOMMAND, the maximum value of a
         request listed below.

         Form driver requests:
         REQNEXTPAGE    Move to the next page.
         REQPREVPAGE    Move to the previous page.
         REQFIRSTPAGE   Move to the first page.
         REQLASTPAGE    Move to the last page.
         REQNEXTFIELD   Move to the next field.
         REQPREVFIELD   Move to the previous field.
         REQFIRSTFIELD  Move to the first field.
         REQLASTFIELD   Move to the last field.
         REQSNEXTFIELD  Move to the sorted next field.
         REQSPREVFIELD  Move to the sorted prev field.
         REQSFIRSTFIELD Move to the sorted first field.
         REQSLASTFIELD  Move to the sorted last field.
         REQLEFTFIELD   Move left to field.
         REQRIGHTFIELD  Move right to field.
         REQUPFIELD     Move up to field.
         REQDOWNFIELD   Move down to field.
         REQNEXTCHAR    Move to the next character in the field.
         REQPREVCHAR    Move to the previous character in the field.
         REQNEXTLINE    Move to the next line in the field.
         REQPREVLINE    Move to the previous line in the field.
         REQNEXTWORD    Move to the next word in the field.
         REQPREVWORD    Move to the previous word in the field.
         REQBEGFIELD    Move to the first char in the field.
         REQENDFIELD    Move after the last char in the field.
         REQBEGLINE     Move to the beginning of the line.
         REQENDLINE     Move after the last char in the line.
         REQLEFTCHAR    Move left in the field.
         REQRIGHTCHAR   Move right in the field.
         REQUPCHAR      Move up in the field.
         REQDOWNCHAR    Move down in the field.
         REQNEWLINE     Insert/overlay a new line.


   7/91                                                                 Page 1

   form_driver(3X)                                             form_driver(3X)


         REQINSCHAR     Insert the blank character at the cursor.
         REQINSLINE     Insert a blank line at the cursor.
         REQDELCHAR     Delete the character at the cursor.
         REQDELPREV     Delete the character before the cursor.
         REQDELLINE     Delete the line at the cursor.
         REQDELWORD     Delete the word at the cursor.
         REQCLREOL      Clear to the end of the line.
         REQCLREOF      Clear to the end of the field.
         REQCLRFIELD    Clear the entire field.
         REQOVLMODE     Enter overlay mode.
         REQINSMODE     Enter insert mode.
         REQSCRFLINE    Scroll the field forward a line.
         REQSCRBLINE    Scroll the field backward a line.
         REQSCRFPAGE    Scroll the field forward a page.
         REQSCRBPAGE    Scroll the field backward a page.
         REQSCRFHPAGE   Scroll the field forward half a page.
         REQSCRBHPAGE   Scroll the field backward half a page.
         REQSCRFCHAR    Horizontal scroll forward a character.
         REQSCRBCHAR    Horizontal scroll backward a character.
         REQSCRHFLINE   Horizontal scroll forward a line.
         REQSCRHBLINE   Horizontal scroll backward a line.
         REQSCRHFHALF   Horizontal scroll forward half a line.
         REQSCRHBHALF   Horizontal scroll backward half a line.
         REQVALIDATION   Validate field.
         REQPREVCHOICE  Display the previous field choice.
         REQNEXTCHOICE  Display the next field choice.

   RETURN VALUE
         formdriver returns one of the following:
         EOK              - The function returned successfully.
         ESYSTEMERROR    - System error.
         EBADARGUMENT    - An argument is incorrect.
         ENOTPOSTED      - The form is not posted.
         EINVALIDFIELD   - The field contents are invalid.
         EBADSTATE       - The routine was called from an
                             initialization or termination
                             function.
         EREQUESTDENIED  - The form driver request failed.
         EUNKNOWNCOMMAND - An unknown request was passed to
                             the the form driver.

   NOTES
         The header file <form.h> automatically includes the header files
         <eti.h> and <curses.h>.

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






   Page 2                                                                 7/91