2 ****************************************************************************
3 * Copyright 2018-2019,2020 Thomas E. Dickey *
4 * Copyright 1998-2010,2017 Free Software Foundation, Inc. *
6 * Permission is hereby granted, free of charge, to any person obtaining a *
7 * copy of this software and associated documentation files (the *
8 * "Software"), to deal in the Software without restriction, including *
9 * without limitation the rights to use, copy, modify, merge, publish, *
10 * distribute, distribute with modifications, sublicense, and/or sell *
11 * copies of the Software, and to permit persons to whom the Software is *
12 * furnished to do so, subject to the following conditions: *
14 * The above copyright notice and this permission notice shall be included *
15 * in all copies or substantial portions of the Software. *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
20 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
21 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
22 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
23 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
25 * Except as contained in this notice, the name(s) of the above copyright *
26 * holders shall not be used in advertising or otherwise to promote the *
27 * sale, use or other dealings in this Software without prior written *
29 ****************************************************************************
30 * @Id: form_field_validation.3x,v 1.25 2020/02/02 23:34:34 tom Exp @
32 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
35 <meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
36 <meta name="generator" content="Manpage converted by man2html - see https://invisible-island.net/scripts/readme.html#others_scripts">
37 <TITLE>form_field_validation 3x</TITLE>
38 <link rel="author" href="mailto:bug-ncurses@gnu.org">
39 <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
42 <H1 class="no-header">form_field_validation 3x</H1>
44 <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>
49 </PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
50 <STRONG>form_field_validation</STRONG> - data type validation for fields
53 </PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
54 <STRONG>#include</STRONG> <STRONG><form.h></STRONG>
55 int set_field_type(FIELD *field, FIELDTYPE *type, ...);
56 FIELDTYPE *field_type(const FIELD *field);
57 void *field_arg(const FIELD *field);
59 FIELDTYPE *TYPE_ALNUM;
60 FIELDTYPE *TYPE_ALPHA;
62 FIELDTYPE *TYPE_INTEGER;
63 FIELDTYPE *TYPE_NUMERIC;
64 FIELDTYPE *TYPE_REGEXP;
68 </PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
69 The function <STRONG>set_field_type</STRONG> declares a data type for a given form
70 field. This is the type checked by validation functions. The prede-
71 fined types are as follows:
74 Alphanumeric data. Requires a third <STRONG>int</STRONG> argument, a minimum field
78 Character data. Requires a third <STRONG>int</STRONG> argument, a minimum field
82 Accept one of a specified set of strings. Requires additional
85 <STRONG>o</STRONG> a third <STRONG>(char</STRONG> <STRONG>**)</STRONG> argument pointing to a string list;
87 <STRONG>o</STRONG> a fourth <STRONG>int</STRONG> flag argument to enable case-sensitivity;
89 <STRONG>o</STRONG> and a fifth <STRONG>int</STRONG> flag argument specifying whether a partial
90 match must be a unique one. If this flag is off, a prefix
91 matches the first of any set of more than one list elements
94 The library copies the string list, so you may use a list that
95 lives in automatic variables on the stack.
98 Integer data, parsable to an integer by <STRONG>atoi(3)</STRONG>. Requires addi-
101 <STRONG>o</STRONG> a third <STRONG>int</STRONG> argument controlling the precision,
103 <STRONG>o</STRONG> a fourth <STRONG>long</STRONG> argument constraining minimum value,
105 <STRONG>o</STRONG> and a fifth <STRONG>long</STRONG> constraining maximum value. If the maximum
106 value is less than or equal to the minimum value, the range is
107 simply ignored. On return, the field buffer is formatted
108 according to the <STRONG>printf</STRONG> format specification ".*ld", where the
109 "*" is replaced by the precision argument.
111 For details of the precision handling see <STRONG>printf(3)</STRONG>.
114 Numeric data (may have a decimal-point part). This requires addi-
117 <STRONG>o</STRONG> a third <STRONG>int</STRONG> argument controlling the precision,
119 <STRONG>o</STRONG> a fourth <STRONG>double</STRONG> argument constraining minimum value,
121 <STRONG>o</STRONG> and a fifth <STRONG>double</STRONG> constraining maximum value. If your system
122 supports locales, the decimal point character must be the one
123 specified by your locale. If the maximum value is less than
124 or equal to the minimum value, the range is simply ignored.
126 On return, the field buffer is formatted according to the
127 <STRONG>printf</STRONG> format specification ".*f", where the "*" is replaced
128 by the precision argument.
130 For details of the precision handling see <STRONG>printf(3)</STRONG>.
133 Regular expression data. Requires a regular expression <STRONG>(char</STRONG> <STRONG>*)</STRONG>
134 third argument. The data is valid if the regular expression
137 Regular expressions are in the format of <STRONG>regcomp</STRONG> and <STRONG>regexec</STRONG>.
139 The regular expression must match the whole field. If you have
140 for example, an eight character wide field, a regular expression
141 "^[0-9]*$" always means that you have to fill all eight positions
142 with digits. If you want to allow fewer digits, you may use for
143 example "^[0-9]* *$" which is good for trailing spaces (up to an
144 empty field), or "^ *[0-9]* *$" which is good for leading and
145 trailing spaces around the digits.
148 An Internet Protocol Version 4 address. This requires no addi-
149 tional argument. The library checks whether or not the buffer has
150 the form a.b.c.d, where a,b,c and d are numbers between 0 and 255.
151 Trailing blanks in the buffer are ignored. The address itself is
154 This is an ncurses extension; this field type may not be available
155 in other curses implementations.
157 It is possible to set up new programmer-defined field types. See the
158 <STRONG><A HREF="form_fieldtype.3x.html">form_fieldtype(3x)</A></STRONG> manual page.
161 </PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
162 The functions <STRONG>field_type</STRONG> and <STRONG>field_arg</STRONG> return <STRONG>NULL</STRONG> on error. The func-
163 tion <STRONG>set_field_type</STRONG> returns one of the following:
165 <STRONG>E_OK</STRONG> The routine succeeded.
167 <STRONG>E_SYSTEM_ERROR</STRONG>
168 System error occurred (see <STRONG>errno(3)</STRONG>).
171 </PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
172 <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>.
175 </PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
176 The header file <STRONG><form.h></STRONG> automatically includes the header file
177 <STRONG><curses.h></STRONG>.
180 </PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
181 These routines emulate the System V forms library. They were not sup-
182 ported on Version 7 or BSD versions.
185 </PRE><H2><a name="h2-AUTHORS">AUTHORS</a></H2><PRE>
186 Juergen Pfeifer. Manual pages and adaptation for new curses by Eric S.
191 <STRONG><A HREF="form_field_validation.3x.html">form_field_validation(3x)</A></STRONG>
195 <li><a href="#h2-NAME">NAME</a></li>
196 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
197 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
198 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
199 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
200 <li><a href="#h2-NOTES">NOTES</a></li>
201 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
202 <li><a href="#h2-AUTHORS">AUTHORS</a></li>