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+<H1 class="no-header">form_fieldtype 3x</H1>
<PRE>
-<!-- Manpage converted by man2html 3.0.1 -->
+<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>NAME</H2><PRE>
- <B>form_fieldtype</B> - define validation-field types
-</PRE>
-<H2>SYNOPSIS</H2><PRE>
- <B>#include</B> <B><form.h></B>
+
+</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
+ 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>DESCRIPTION</H2><PRE>
- The function <B>new_fieldtype</B> creates a new field type usable
- for data validation. You supply it with <I>field</I><B>_</B><I>check</I>, a
- predicate to check the validity of an entered data string
- whenever the user attempt 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 <B>new_fieldtype</B> with <I>char</I><B>_</B><I>check</I>, 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 <B>free_fieldtype</B> frees the space allocated for
- a given validation type.
-
- The function <B>set_fieldtype</B> associates three storage-man-
- agement functions with a field type. The <I>mak</I><B>_</B><I>arg</I> function
- is automatically applied to the list of arguments you give
- <B>set_field_type</B> when attaching validation to a field; its
- job is to bundle these into an allocated argument-block
- object which can later be passed to validation predicated.
- The other two hook arguments should copy and free argu-
- ment-block structures. They will be used by the forms-
- driver code. You must supply the <I>mak</I><B>_</B><I>arg</I> function, the
- other two are optional, you may supply NULL for them. In
- this case it is assumed, that <I>mak</I><B>_</B><I>arg</I> doesn't allocate
- memory but simply loads the argument into a single scalar
+</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 predi-
+ cate 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 vali-
+ dation 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
+ argument-block object which can later be passed to validation predi-
+ cated. 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 form driver requests <B>REQ_NEXT_CHOICE</B> and
- <B>REQ_PREV_CHOICE</B> 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 <B>set_fieldtype_choice</B> 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.
+ 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_field-</STRONG>
+ <STRONG>type_choice</STRONG> function allows forms programmers to define successor and
+ predecessor functions for the field type. These functions take the
+ field pointer and an argument-block structure as arguments.
-</PRE>
-<H2>RETURN VALUE</H2><PRE>
- The pointer-valued routines return NULL on error.
- The integer-valued routines return one of the following
- codes on error:
+</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
+ The pointer-valued routines return NULL on error. They set <STRONG>errno</STRONG>
+ according to their success:
- <B>E_OK</B> The routine succeeded.
+ <STRONG>E_OK</STRONG> The routine succeeded.
- <B>E_SYSTEM_ERROR</B>
- System error occurred (see <B>errno</B>).
+ <STRONG>E_BAD_ARGUMENT</STRONG>
+ Routine detected an incorrect or out-of-range argument.
- <B>E_BAD_ARGUMENT</B>
- Routine detected an incorrect or out-of-range argu-
- ment.
+ <STRONG>E_SYSTEM_ERROR</STRONG>
+ System error occurred, e.g., malloc failure.
- <B>E_CONNECTED</B>
- The field is already connected to a form.
+ The integer-valued routines return one of the following codes on error:
+ <STRONG>E_OK</STRONG> The routine succeeded.
-</PRE>
-<H2>SEE ALSO</H2><PRE>
- <B><A HREF="ncurses.3x.html">curses(3x)</A></B>, <B><A HREF="form.3x.html">form(3x)</A></B>.
+ <STRONG>E_BAD_ARGUMENT</STRONG>
+ Routine detected an incorrect or out-of-range argument.
+ <STRONG>E_CONNECTED</STRONG>
+ The field is already connected to a form.
-</PRE>
-<H2>NOTES</H2><PRE>
- The header file <B><form.h></B> automatically includes the header
- file <B><curses.h></B>.
-
- All of the <B>(char</B> <B>*)</B> arguments of these functions should
- actually be <B>(void</B> <B>*)</B>. The type has been left uncorrected
- for strict compatibility with System V.
-
+ <STRONG>E_CURRENT</STRONG>
+ The field is the current field.
-</PRE>
-<H2>PORTABILITY</H2><PRE>
- These routines emulate the System V forms library. They
- were not supported on Version 7 or BSD versions.
+ <STRONG>E_SYSTEM_ERROR</STRONG>
+ System error occurred (see <STRONG>errno(3)</STRONG>).
-</PRE>
-<H2>AUTHORS</H2><PRE>
- Juergen Pfeifer. Manual pages and adaptation for new
- curses by Eric S. Raymond.
+</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 sup-
+ ported 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>
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+<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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