form_field_buffer(3x) form_field_buffer(3x)
form_field_buffer - field buffer control
#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);
The function set_field_buffer sets the numbered buffer of
the given field to contain a given string:
o Buffer 0 is the displayed value of the field.
o Other numbered buffers may be allocated by applica-
tions 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 con-
tents of the given numbered buffer:
o The buffer contents always have the same length,
and are padded with trailing spaces as needed to
ensure this length is the same.
o The buffer may contain leading spaces, depending on
how it was set.
o The buffer contents are set with set_field_buffer,
or as a side effect of any editing operations on
the corresponding field.
o Editing operations are based on the window which
displays the field, rather than a string. The win-
dow 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.
o 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.
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 argu-
ment.
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 argu-
ment.
curses(3x) and related pages whose names begin "form_" for
detailed descriptions of the entry points.
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_buf-
fer to return the same buffer. <curses.h>.
These routines emulate the System V forms library. They
were not supported on Version 7 or BSD versions.
Juergen Pfeifer. Manual pages and adaptation for new
curses by Eric S. Raymond.
form_field_buffer(3x)