- The function set_field_type declares a data type for a given form
- field. This is the type checked by validation functions. The prede-
- fined types are as follows:
+ By default, no validation is done on form fields. You can associate a
+ form with with a fieldtype, making the form library validate input.
+
+
+
+ Returns a pointer to the field's argument block. The argumentblock is
+ an opaque structure containing a copy of the arguments provided in a
+ set_field_type call.
+
+
+
+ The function set_field_type associates a field type with a given form
+ field. This is the type checked by validation functions. Most field
+ types are configurable, via arguments which the caller provides when
+ calling set_field_type.
+
+ Several field types are predefined by the form library.
+
+
+
+ It is possible to set up new programmer-defined field types. Field
+ types are implemented via the FIELDTYPE data structure, which contains
+ several pointers to functions.
+
+ See the form_fieldtype(3x) manual page, which describes functions which
+ can be used to construct a field-type dynamically.
+
+ The predefined types are as follows:
TYPE_ALNUM
- Alphanumeric data. Requires a third int argument, a minimum field
- width.
+ Alphanumeric data. Required parameter:
+
+ o a third int argument, a minimum field width.
TYPE_ALPHA
- Character data. Requires a third int argument, a minimum field
- width.
+ Character data. Required parameter:
+
+ o a third int argument, a minimum field width.
TYPE_ENUM
- Accept one of a specified set of strings. Requires additional
- parameters:
+ Accept one of a specified set of strings. Required parameters:
o a third (char**) argument pointing to a string list;
o a fourth int flag argument to enable case-sensitivity;
- o 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 elements
- with that prefix.
+ o 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 elements with that
+ prefix.
- The library copies the string list, so you may use a list that
- lives in automatic variables on the stack.
+ The library copies the string list, 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 addi-
- tional parameters:
+ Integer data, parsable to an integer by atoi(3). Required
+ parameters:
o a third int argument controlling the precision,
o a fourth long argument constraining minimum value,
- o 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 formatted
- according to the printf format specification ".*ld", where the
- "*" is replaced by the precision argument.
+ o 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 formatted according to the printf
+ format specification ".*ld", where the "*" is replaced by the
+ precision argument.
- For details of the precision handling see printf(3).
+ For details of the precision handling see printf(3).
TYPE_NUMERIC
- Numeric data (may have a decimal-point part). This requires addi-
- tional parameters:
+ Numeric data (may have a decimal-point part). Required
+ parameters:
o a third int argument controlling the precision,
o a fourth double argument constraining minimum value,
o and a fifth double constraining maximum value. If your system
- supports locales, the decimal point character must be the one
- specified by your locale. If the maximum value is less than
+ supports locales, the decimal point character 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.
+ 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(3).
+ For details of the precision handling see printf(3).
TYPE_REGEXP
- Regular expression data. Requires a regular expression (char*)
- third argument. The data is valid if the regular expression
- matches it.
+ Regular expression data. Required parameter:
+
+ o a third argument, a regular expression (char*) string. The
+ data is valid if the regular expression matches it.
Regular expressions are in the format of regcomp and regexec.
@@ -144,22 +181,22 @@
trailing spaces around the digits.
TYPE_IPV4
- An Internet Protocol Version 4 address. This requires no addi-
- tional argument. The library checks 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
+ An Internet Protocol Version 4 address. Required parameter:
+
+ o none
+
+ The form library checks whether or not the buffer has the form
+ a.b.c.d, where a, b, c, and d are numbers in the range 0 to 255.
+ Trailing blanks in the buffer are ignored. The address itself is
not validated.
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.
-
- The functions field_type and field_arg return NULL on error. The func-
- tion set_field_type returns one of the following:
+ 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.
@@ -168,7 +205,7 @@
- These routines emulate the System V forms library. They were not sup-
- ported on Version 7 or BSD versions.
+ These routines emulate the System V forms library. They were not
+ supported on Version 7 or BSD versions.