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form_field_validation(3X) form_field_validation(3X)
NAME
form_field_validation - data type validation for fields
SYNOPSIS
#include <form.h>
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;
DESCRIPTION
The function set_field_type 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 int argument, a minimum field width.
TYPE_ALPHA
Character data. Requires a third int argument, a minimum field width.
TYPE_ENUM
Accept one of a specified set of strings. Requires a third (char **) argument point-
ing to a string list; a fourth int flag argument to enable case-sensitivity; and a
fifth int 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 ele-
ments 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 atoi(3). Requires a third int argument con-
trolling the precision, a fourth long argument constraining minimum value, and a
fifth long 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 format-
ted according to the printf format specification ".*ld", where the '*' is replaced by
the precision argument. For details of the precision handling see printf's man-page.
TYPE_NUMERIC
Numeric data (may have a decimal-point part). Requires a third int argument control-
ling the precision, a fourth double argument constraining minimum value, and a fifth
double 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 printf format specification ".*f",
where the '*' is replaced by the precision argument. For details of the precision
handling see printf's man-page.
TYPE_REGEXP
Regular expression data. Requires a regular expression (char *) third argument; the
data is valid if the regular expression matches it. Regular expressions are in the
format of regcomp and regexec. 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.
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.
It is possible to set up new programmer-defined field types. See the form_fieldtype(3X)
manual page.
RETURN VALUE
The functions field_type and field_arg return NULL on error. The function set_field_type
returns one of the following:
E_OK The routine succeeded.
E_SYSTEM_ERROR
System error occurred (see errno).
SEE ALSO
curses(3X), form(3X), form_variables(3X).
NOTES
The header file <form.h> automatically includes the header file <curses.h>.
PORTABILITY
These routines emulate the System V forms library. They were not supported on Version 7
or BSD versions.
AUTHORS
Juergen Pfeifer. Manual pages and adaptation for new curses by Eric S. Raymond.
form_field_validation(3X)
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On Apache
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