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| * @Id: form_fieldtype.3x,v 1.16 2010/12/04 18:40:45 tom Exp @ |
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| <H1 class="no-header">form_fieldtype 3x</H1> |
| <PRE> |
| <STRONG><A HREF="form_fieldtype.3x.html">form_fieldtype(3x)</A></STRONG> <STRONG><A HREF="form_fieldtype.3x.html">form_fieldtype(3x)</A></STRONG> |
| |
| |
| |
| |
| </PRE> |
| <H2><a name="h2-NAME">NAME</a></H2><PRE> |
| <STRONG>form_fieldtype</STRONG> - define validation-field types |
| |
| |
| </PRE> |
| <H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE> |
| <STRONG>#include</STRONG> <STRONG><form.h></STRONG> |
| FIELDTYPE *new_fieldtype( |
| bool (* const field_check)(FIELD *, const void *), |
| bool (* const char_check)(int, const void *)); |
| int free_fieldtype(FIELDTYPE *fieldtype); |
| int set_fieldtype_arg( |
| FIELDTYPE *fieldtype, |
| void *(* const make_arg)(va_list *), |
| void *(* const copy_arg)(const void *), |
| void (* const free_arg)(void *)); |
| int set_fieldtype_choice( |
| FIELDTYPE *fieldtype, |
| bool (* const next_choice)(FIELD *, const void *), |
| bool (* const prev_choice)(FIELD *, const void *)); |
| FIELDTYPE *link_fieldtype(FIELDTYPE *type1, |
| FIELDTYPE *type2); |
| |
| |
| </PRE> |
| <H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE> |
| The function <STRONG>new_fieldtype</STRONG> creates a new field type usable |
| for data validation. You supply it with <EM>field</EM><STRONG>_</STRONG><EM>check</EM>, a |
| predicate to check the validity of an entered data string |
| whenever the user attempts to leave a field. The (FIELD |
| *) argument is passed in so the validation predicate can |
| see the field's buffer, sizes and other attributes; the |
| second argument is an argument-block structure, about |
| which more below. |
| |
| You also supply <STRONG>new_fieldtype</STRONG> with <EM>char</EM><STRONG>_</STRONG><EM>check</EM>, a function |
| to validate input characters as they are entered; it will |
| be passed the character to be checked and a pointer to an |
| argument-block structure. |
| |
| The function <STRONG>free_fieldtype</STRONG> frees the space allocated for |
| a given validation type. |
| |
| The function <STRONG>set_fieldtype_arg</STRONG> associates three storage- |
| management functions with a field type. The <EM>make</EM><STRONG>_</STRONG><EM>arg</EM> |
| function is automatically applied to the list of arguments |
| you give <STRONG>set_field_type</STRONG> when attaching validation to a |
| field; its job is to bundle these into an allocated argu- |
| ment-block object which can later be passed to validation |
| predicated. The other two hook arguments should copy and |
| free argument-block structures. They will be used by the |
| forms-driver code. You must supply the <EM>make</EM><STRONG>_</STRONG><EM>arg</EM> function, |
| the other two are optional, you may supply NULL for them. |
| In this case it is assumed that <EM>make</EM><STRONG>_</STRONG><EM>arg</EM> does not allocate |
| memory but simply loads the argument into a single scalar |
| value. |
| |
| The function <STRONG>link_fieldtype</STRONG> creates a new field type from |
| the two given types. They are connected by an logical |
| 'OR'. |
| |
| The form driver requests <STRONG>REQ_NEXT_CHOICE</STRONG> and |
| <STRONG>REQ_PREV_CHOICE</STRONG> assume that the possible values of a field |
| form an ordered set, and provide the forms user with a way |
| to move through the set. The <STRONG>set_fieldtype_choice</STRONG> func- |
| tion allows forms programmers to define successor and pre- |
| decessor functions for the field type. These functions |
| take the field pointer and an argument-block structure as |
| arguments. |
| |
| |
| </PRE> |
| <H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE> |
| The pointer-valued routines return NULL on error. They |
| set errno according to their success: |
| |
| <STRONG>E_OK</STRONG> The routine succeeded. |
| |
| <STRONG>E_BAD_ARGUMENT</STRONG> |
| Routine detected an incorrect or out-of-range argu- |
| ment. |
| |
| <STRONG>E_SYSTEM_ERROR</STRONG> |
| System error occurred, e.g., malloc failure. |
| |
| The integer-valued routines return one of the following |
| codes on error: |
| |
| <STRONG>E_OK</STRONG> The routine succeeded. |
| |
| <STRONG>E_BAD_ARGUMENT</STRONG> |
| Routine detected an incorrect or out-of-range argu- |
| ment. |
| |
| <STRONG>E_CONNECTED</STRONG> |
| The field is already connected to a form. |
| |
| <STRONG>E_CURRENT</STRONG> |
| The field is the current field. |
| |
| <STRONG>E_SYSTEM_ERROR</STRONG> |
| System error occurred (see <STRONG>errno</STRONG>). |
| |
| |
| </PRE> |
| <H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE> |
| <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="form.3x.html">form(3x)</A></STRONG>. |
| |
| |
| </PRE> |
| <H2><a name="h2-NOTES">NOTES</a></H2><PRE> |
| The header file <STRONG><form.h></STRONG> automatically includes the header |
| file <STRONG><curses.h></STRONG>. |
| |
| All of the <STRONG>(char</STRONG> <STRONG>*)</STRONG> arguments of these functions should |
| actually be <STRONG>(void</STRONG> <STRONG>*)</STRONG>. The type has been left uncorrected |
| for strict compatibility with System V. |
| |
| |
| </PRE> |
| <H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE> |
| These routines emulate the System V forms library. They |
| were not supported on Version 7 or BSD versions. |
| |
| |
| </PRE> |
| <H2><a name="h2-AUTHORS">AUTHORS</a></H2><PRE> |
| Juergen Pfeifer. Manual pages and adaptation for new |
| curses by Eric S. Raymond. |
| |
| |
| |
| <STRONG><A HREF="form_fieldtype.3x.html">form_fieldtype(3x)</A></STRONG> |
| </PRE> |
| <div class="nav"> |
| <ul> |
| <li><a href="#h2-NAME">NAME</a></li> |
| <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li> |
| <li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li> |
| <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li> |
| <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li> |
| <li><a href="#h2-NOTES">NOTES</a></li> |
| <li><a href="#h2-PORTABILITY">PORTABILITY</a></li> |
| <li><a href="#h2-AUTHORS">AUTHORS</a></li> |
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