ncurses/man/form_field_validation.3x - nest-cam/4320010/ncurses - Git at Google

 .\"***************************************************************************
 .\" Copyright (c) 1998-2006,2010 Free Software Foundation, Inc.              *
 .\"                                                                          *
 .\" Permission is hereby granted, free of charge, to any person obtaining a  *
 .\" copy of this software and associated documentation files (the            *
 .\" "Software"), to deal in the Software without restriction, including      *
 .\" without limitation the rights to use, copy, modify, merge, publish,      *
 .\" distribute, distribute with modifications, sublicense, and/or sell       *
 .\" copies of the Software, and to permit persons to whom the Software is    *
 .\" furnished to do so, subject to the following conditions:                 *
 .\"                                                                          *
 .\" The above copyright notice and this permission notice shall be included  *
 .\" in all copies or substantial portions of the Software.                   *
 .\"                                                                          *
 .\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
 .\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
 .\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
 .\" IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
 .\" DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
 .\" OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
 .\" THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
 .\"                                                                          *
 .\" Except as contained in this notice, the name(s) of the above copyright   *
 .\" holders shall not be used in advertising or otherwise to promote the     *
 .\" sale, use or other dealings in this Software without prior written       *
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"
 .\" $Id: form_field_validation.3x,v 1.20 2010/12/04 18:38:55 tom Exp $
 .TH form_field_validation 3X ""
 .SH NAME
 \fBform_field_validation\fR \- data type validation for fields
 .SH SYNOPSIS
 \fB#include <form.h>\fR
 .br
 int set_field_type(FIELD *field, FIELDTYPE *type, ...);
 .br
 FIELDTYPE *field_type(const FIELD *field);
 .br
 void *field_arg(const FIELD *field);
 .sp
 FIELDTYPE *TYPE_ALNUM;
 .br
 FIELDTYPE *TYPE_ALPHA;
 .br
 FIELDTYPE *TYPE_ENUM;
 .br
 FIELDTYPE *TYPE_INTEGER;
 .br
 FIELDTYPE *TYPE_NUMERIC;
 .br
 FIELDTYPE *TYPE_REGEXP;
 .br
 FIELDTYPE *TYPE_IPV4;
 .br
 .SH DESCRIPTION
 The function \fBset_field_type\fR declares a data type for a given form field.
 This is the type checked by validation functions.
 The predefined types are as follows:
 .TP 5
 TYPE_ALNUM
 Alphanumeric data.  Requires a third \fBint\fR argument, a minimum field width.
 .TP 5
 TYPE_ALPHA
 Character data.  Requires a third \fBint\fR argument, a minimum field width.
 .TP 5
 TYPE_ENUM
 Accept one of a specified set of strings.  Requires a third \fB(char **)\fR
 argument pointing to a string list; a fourth \fBint\fR flag argument to enable
 case-sensitivity; and a fifth \fBint\fR 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.
 .TP 5
 TYPE_INTEGER
 Integer data, parsable to an integer by \fBatoi(3)\fR.  Requires a third
 \fBint\fR argument controlling the precision, a fourth \fBlong\fR argument
 constraining minimum value, and a fifth \fBlong\fR 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
 \fBprintf\fR format specification ".*ld", where the '*' is replaced by the
 precision argument.
 For details of the precision handling see \fBprintf's\fR man-page.
 .TP 5
 TYPE_NUMERIC
 Numeric data (may have a decimal-point part). Requires a third
 \fBint\fR argument controlling the precision, a fourth \fBdouble\fR
 argument constraining minimum value, and a fifth \fBdouble\fR 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
 \fBprintf\fR format specification ".*f", where the '*' is replaced by the
 precision argument.
 For details of the precision handling see \fBprintf's\fR man-page.
 .TP 5
 TYPE_REGEXP
 Regular expression data.  Requires a regular expression \fB(char *)\fR third argument;
 the data is valid if the regular expression matches it.  Regular expressions
 are in the format of \fBregcomp\fR and \fBregexec\fR. 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]*$" always
 means that you have to fill all eight positions with digits. If you want to
 allow fewer digits, you may use for example "^[0\-9]* *$" 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.
 .TP 5
 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 validated. Please note that this is an ncurses extension. This
 field type may not be available in other curses implementations.
 .PP
 It is possible to set up new programmer-defined field types.  See the
 \fBform_fieldtype\fR(3X) manual page.
 .SH RETURN VALUE
 The functions \fBfield_type\fR and \fBfield_arg\fR return \fBNULL\fR on
 error. The function \fBset_field_type\fR returns one of the following:
 .TP 5
 .B E_OK
 The routine succeeded.
 .TP 5
 .B E_SYSTEM_ERROR
 System error occurred (see \fBerrno\fR).
 .SH SEE ALSO
 \fBcurses\fR(3X),
 \fBform\fR(3X),
 \fBform_variables\fR(3X).
 .SH NOTES
 The header file \fB<form.h>\fR automatically includes the header file
 \fB<curses.h>\fR.
 .SH PORTABILITY
 These routines emulate the System V forms library.  They were not supported on
 Version 7 or BSD versions.
 .SH AUTHORS
 Juergen Pfeifer.  Manual pages and adaptation for new curses by Eric
 S. Raymond.
	.\"***************************************************************************
	.\" Copyright (c) 1998-2006,2010 Free Software Foundation, Inc. *
	.\" *
	.\" Permission is hereby granted, free of charge, to any person obtaining a *
	.\" copy of this software and associated documentation files (the *
	.\" "Software"), to deal in the Software without restriction, including *
	.\" without limitation the rights to use, copy, modify, merge, publish, *
	.\" distribute, distribute with modifications, sublicense, and/or sell *
	.\" copies of the Software, and to permit persons to whom the Software is *
	.\" furnished to do so, subject to the following conditions: *
	.\" *
	.\" The above copyright notice and this permission notice shall be included *
	.\" in all copies or substantial portions of the Software. *
	.\" *
	.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
	.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
	.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
	.\" IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
	.\" DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
	.\" OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
	.\" THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
	.\" *
	.\" Except as contained in this notice, the name(s) of the above copyright *
	.\" holders shall not be used in advertising or otherwise to promote the *
	.\" sale, use or other dealings in this Software without prior written *
	.\" authorization. *
	.\"***************************************************************************
	.\"
	.\" $Id: form_field_validation.3x,v 1.20 2010/12/04 18:38:55 tom Exp $
	.TH form_field_validation 3X ""
	.SH NAME
	\fBform_field_validation\fR \- data type validation for fields
	.SH SYNOPSIS
	\fB#include <form.h>\fR
	.br
	int set_field_type(FIELD field, FIELDTYPE type, ...);
	.br
	FIELDTYPE field_type(const FIELD field);
	.br
	void field_arg(const FIELD field);
	.sp
	FIELDTYPE *TYPE_ALNUM;
	.br
	FIELDTYPE *TYPE_ALPHA;
	.br
	FIELDTYPE *TYPE_ENUM;
	.br
	FIELDTYPE *TYPE_INTEGER;
	.br
	FIELDTYPE *TYPE_NUMERIC;
	.br
	FIELDTYPE *TYPE_REGEXP;
	.br
	FIELDTYPE *TYPE_IPV4;
	.br
	.SH DESCRIPTION
	The function \fBset_field_type\fR declares a data type for a given form field.
	This is the type checked by validation functions.
	The predefined types are as follows:
	.TP 5
	TYPE_ALNUM
	Alphanumeric data. Requires a third \fBint\fR argument, a minimum field width.
	.TP 5
	TYPE_ALPHA
	Character data. Requires a third \fBint\fR argument, a minimum field width.
	.TP 5
	TYPE_ENUM
	Accept one of a specified set of strings. Requires a third \fB(char **)\fR
	argument pointing to a string list; a fourth \fBint\fR flag argument to enable
	case-sensitivity; and a fifth \fBint\fR 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.
	.TP 5
	TYPE_INTEGER
	Integer data, parsable to an integer by \fBatoi(3)\fR. Requires a third
	\fBint\fR argument controlling the precision, a fourth \fBlong\fR argument
	constraining minimum value, and a fifth \fBlong\fR 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
	\fBprintf\fR format specification ".ld", where the '' is replaced by the
	precision argument.
	For details of the precision handling see \fBprintf's\fR man-page.
	.TP 5
	TYPE_NUMERIC
	Numeric data (may have a decimal-point part). Requires a third
	\fBint\fR argument controlling the precision, a fourth \fBdouble\fR
	argument constraining minimum value, and a fifth \fBdouble\fR 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
	\fBprintf\fR format specification ".f", where the '' is replaced by the
	precision argument.
	For details of the precision handling see \fBprintf's\fR man-page.
	.TP 5
	TYPE_REGEXP
	Regular expression data. Requires a regular expression \fB(char *)\fR third argument;
	the data is valid if the regular expression matches it. Regular expressions
	are in the format of \fBregcomp\fR and \fBregexec\fR. 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]*$" always
	means that you have to fill all eight positions with digits. If you want to
	allow fewer digits, you may use for example "^[0\-9]* *$" 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.
	.TP 5
	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 validated. Please note that this is an ncurses extension. This
	field type may not be available in other curses implementations.
	.PP
	It is possible to set up new programmer-defined field types. See the
	\fBform_fieldtype\fR(3X) manual page.
	.SH RETURN VALUE
	The functions \fBfield_type\fR and \fBfield_arg\fR return \fBNULL\fR on
	error. The function \fBset_field_type\fR returns one of the following:
	.TP 5
	.B E_OK
	The routine succeeded.
	.TP 5
	.B E_SYSTEM_ERROR
	System error occurred (see \fBerrno\fR).
	.SH SEE ALSO
	\fBcurses\fR(3X),
	\fBform\fR(3X),
	\fBform_variables\fR(3X).
	.SH NOTES
	The header file \fB<form.h>\fR automatically includes the header file
	\fB<curses.h>\fR.
	.SH PORTABILITY
	These routines emulate the System V forms library. They were not supported on
	Version 7 or BSD versions.
	.SH AUTHORS
	Juergen Pfeifer. Manual pages and adaptation for new curses by Eric
	S. Raymond.