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+ * @Id: form_field_validation.3x,v 1.12 2002/02/16 22:39:52 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 -->
+
+</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);
+
+
+</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 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 not copied, only a
+ reference to it is stored in the field. So you should
+ avoid to 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 or equal 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 locale's, the decimal point
+ character to be used must be the one specified by
+ your locale. If the maximum value is less or equal
+ 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><A HREF="regcomp.3x.html">regcomp(3x)</A></STRONG> and
+ <STRONG><A HREF="regexec.3x.html">regexec(3x)</A></STRONG>. Please notice that the regular expres-
+ sion must match the whole field. If you have for
+ example an eight character wide field, a regular
+ expression "^[0-9]*$" always means that you have to
+ fill all eight positions with digits. If you want to
+ allow fewer digits, you may use for example "^[0-9]*
+ *$" 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>.
+
+
+</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.
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+<HR>
+<ADDRESS>
+Man(1) output converted with
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