.\"*************************************************************************** .\" Copyright (c) 1998-2010,2017 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 1.21 2017/11/20 01:28:31 tom Exp $ .TH form_field_validation 3X "" .SH NAME \fBform_field_validation\fR \- data type validation for fields .SH SYNOPSIS \fB#include \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\fP(3). 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\fR automatically includes the header file \fB\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.