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form_field_new

Section: Miscellaneous Library Functions (3X)
Updated:
Index Return to Main Contents
 

NAME

form_field_new - create and destroy form fields  

SYNOPSIS

#include <form.h>
FIELD *new_field(int height, int width,
                 int toprow, int leftcol,
                 int offscreen, int nbuffers);
FIELD *dup_field(FIELD *field, int toprow, int leftcol);
FIELD *link_field(FIELD *field, int toprow, int leftcol);
int free_field(FIELD *field);
 

DESCRIPTION

The function new_field allocates a new field and initializes it from the parameters given: height, width, row of upper-left corner, column of upper-left corner, number off-screen rows, and number of additional working buffers.

The function dup_field duplicates a field at a new location. Most attributes (including current contents, size, validation type, buffer count, growth threshold, justification, foreground, background, pad character, options, and user pointer) are copied. Field status and the field page bit are not copied.

The function link_field acts like dup_field, but the new field shares buffers with its parent. Attribute data is separate.

The function free_field de-allocates storage associated with a field.  

RETURN VALUE

The function, new_field, dup_field, link_field return NULL on error. They set errno according to their success:
E_OK
The routine succeeded.
E_BAD_ARGUMENT
Routine detected an incorrect or out-of-range argument.
E_SYSTEM_ERROR
System error occurred, e.g., malloc failure.

The function free_field returns one of the following:

E_OK
The routine succeeded.
E_BAD_ARGUMENT
Routine detected an incorrect or out-of-range argument.
E_CONNECTED
field is connected.
 

SEE ALSO

curses(3X), form(3X).  

NOTES

The header file <form.h> automatically includes the header file <curses.h>.  

PORTABILITY

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

It may be unwise to count on the set of attributes copied by dup_field being portable; the System V forms library documents are not very explicit about what gets copied and what does not.  

AUTHORS

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


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
SEE ALSO
NOTES
PORTABILITY
AUTHORS


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