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+ * @Id: form_field_validation.3x,v 1.20 2010/12/04 18:38:55 tom Exp @
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+<HTML>
+<HEAD>
+<TITLE>form_field_validation 3x</TITLE>
+<link rev=made href="mailto:bug-ncurses@gnu.org">
+<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
+</HEAD>
+<BODY>
+<H1>form_field_validation 3x</H1>
+<HR>
+<PRE>
+<!-- Manpage converted by man2html 3.0.1 -->
+<STRONG><A HREF="form_field_validation.3x.html">form_field_validation(3x)</A></STRONG> <STRONG><A HREF="form_field_validation.3x.html">form_field_validation(3x)</A></STRONG>
+
+
+
+
+</PRE>
+<H2>NAME</H2><PRE>
+ <STRONG>form_field_validation</STRONG> - data type validation for fields
+
+
+</PRE>
+<H2>SYNOPSIS</H2><PRE>
+ <STRONG>#include</STRONG> <STRONG>&lt;form.h&gt;</STRONG>
+ int set_field_type(FIELD *field, FIELDTYPE *type, ...);
+ FIELDTYPE *field_type(const FIELD *field);
+ void *field_arg(const FIELD *field);
+
+ FIELDTYPE *TYPE_ALNUM;
+ FIELDTYPE *TYPE_ALPHA;
+ FIELDTYPE *TYPE_ENUM;
+ FIELDTYPE *TYPE_INTEGER;
+ FIELDTYPE *TYPE_NUMERIC;
+ FIELDTYPE *TYPE_REGEXP;
+ FIELDTYPE *TYPE_IPV4;
+
+
+</PRE>
+<H2>DESCRIPTION</H2><PRE>
+ The function <STRONG>set_field_type</STRONG> declares a data type for a
+ given form field. This is the type checked by validation
+ functions. The predefined types are as follows:
+
+ TYPE_ALNUM
+ Alphanumeric data. Requires a third <STRONG>int</STRONG> argument, a
+ minimum field width.
+
+ TYPE_ALPHA
+ Character data. Requires a third <STRONG>int</STRONG> argument, a
+ minimum field width.
+
+ TYPE_ENUM
+ Accept one of a specified set of strings. Requires a
+ third <STRONG>(char</STRONG> <STRONG>**)</STRONG> argument pointing to a string list; a
+ fourth <STRONG>int</STRONG> flag argument to enable case-sensitivity;
+ and a fifth <STRONG>int</STRONG> flag argument specifying whether a
+ partial match must be a unique one (if this flag is
+ off, a prefix matches the first of any set of more
+ than one list elements with that prefix). Please
+ notice that the string list is copied. So you may use
+ a list that lives in automatic variables on the
+ stack.
+
+ TYPE_INTEGER
+ Integer data, parsable to an integer by <STRONG>atoi(3)</STRONG>.
+ Requires a third <STRONG>int</STRONG> argument controlling the preci-
+ sion, a fourth <STRONG>long</STRONG> argument constraining minimum
+ value, and a fifth <STRONG>long</STRONG> constraining maximum value.
+ If the maximum value is less than or equal to the
+ minimum value, the range is simply ignored. On return
+ the field buffer is formatted according to the <STRONG>printf</STRONG>
+ format specification ".*ld", where the '*' is
+ replaced by the precision argument. For details of
+ the precision handling see <STRONG>printf's</STRONG> man-page.
+
+ TYPE_NUMERIC
+ Numeric data (may have a decimal-point part).
+ Requires a third <STRONG>int</STRONG> argument controlling the preci-
+ sion, a fourth <STRONG>double</STRONG> argument constraining minimum
+ value, and a fifth <STRONG>double</STRONG> constraining maximum value.
+ If your system supports locales, the decimal point
+ character to be used must be the one specified by
+ your locale. If the maximum value is less than or
+ equal to the minimum value, the range is simply
+ ignored. On return the field buffer is formatted
+ according to the <STRONG>printf</STRONG> format specification ".*f",
+ where the '*' is replaced by the precision argument.
+ For details of the precision handling see <STRONG>printf's</STRONG>
+ man-page.
+
+ TYPE_REGEXP
+ Regular expression data. Requires a regular expres-
+ sion <STRONG>(char</STRONG> <STRONG>*)</STRONG> third argument; the data is valid if
+ the regular expression matches it. Regular expres-
+ sions are in the format of <STRONG>regcomp</STRONG> and <STRONG>regexec</STRONG>.
+ Please notice that the regular expression must match
+ the whole field. If you have for example an eight
+ character wide field, a regular expression "^[0-9]*$"
+ always means that you have to fill all eight posi-
+ tions with digits. If you want to allow fewer digits,
+ you may use for example "^[0-9]* *$" which is good
+ for trailing spaces (up to an empty field), or "^
+ *[0-9]* *$" which is good for leading and trailing
+ spaces around the digits.
+
+ TYPE_IPV4
+ An Internet Protocol Version 4 address. This requires
+ no additional argument. It is checked whether or not
+ the buffer has the form a.b.c.d, where a,b,c and d
+ are numbers between 0 and 255. Trailing blanks in the
+ buffer are ignored. The address itself is not vali-
+ dated. Please note that this is an ncurses extension.
+ This field type may not be available in other curses
+ implementations.
+
+ It is possible to set up new programmer-defined field
+ types. See the <STRONG><A HREF="form_fieldtype.3x.html">form_fieldtype(3x)</A></STRONG> manual page.
+
+
+</PRE>
+<H2>RETURN VALUE</H2><PRE>
+ The functions <STRONG>field_type</STRONG> and <STRONG>field_arg</STRONG> return <STRONG>NULL</STRONG> on
+ error. The function <STRONG>set_field_type</STRONG> returns one of the fol-
+ lowing:
+
+ <STRONG>E_OK</STRONG> The routine succeeded.
+
+ <STRONG>E_SYSTEM_ERROR</STRONG>
+ System error occurred (see <STRONG>errno</STRONG>).
+
+
+</PRE>
+<H2>SEE ALSO</H2><PRE>
+ <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="form.3x.html">form(3x)</A></STRONG>, <STRONG><A HREF="form_variables.3x.html">form_variables(3x)</A></STRONG>.
+
+
+</PRE>
+<H2>NOTES</H2><PRE>
+ The header file <STRONG>&lt;form.h&gt;</STRONG> automatically includes the header
+ file <STRONG>&lt;curses.h&gt;</STRONG>.
+
+
+</PRE>
+<H2>PORTABILITY</H2><PRE>
+ These routines emulate the System V forms library. They
+ were not supported on Version 7 or BSD versions.
+
+
+</PRE>
+<H2>AUTHORS</H2><PRE>
+ Juergen Pfeifer. Manual pages and adaptation for new
+ curses by Eric S. Raymond.
+
+
+
+ <STRONG><A HREF="form_field_validation.3x.html">form_field_validation(3x)</A></STRONG>
+</PRE>
+<HR>
+<ADDRESS>
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