X-Git-Url: https://ncurses.scripts.mit.edu/?a=blobdiff_plain;f=doc%2Fhtml%2Fman%2Fform_field_validation.3x.html;h=64e780bdc582e2d283842d21a32858bdef157f3c;hb=a47b9e53836434777854387fa6f09f2137ec2111;hp=e810402edcf6eae2656086937f77ccd98e3e2a4e;hpb=3a935d9991cdf43ebfa952073c9b555f73a3e011;p=ncurses.git diff --git a/doc/html/man/form_field_validation.3x.html b/doc/html/man/form_field_validation.3x.html index e810402e..64e780bd 100644 --- a/doc/html/man/form_field_validation.3x.html +++ b/doc/html/man/form_field_validation.3x.html @@ -1,7 +1,7 @@ - - +
-- -form_field_validation(3x) form_field_validation(3x) +form_field_validation(3x) Library calls form_field_validation(3x) --
+
form_field_validation - data type validation for fields --
+
#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; + void *field_arg(const FIELD *field); + FIELDTYPE *field_type(const FIELD *field); + int set_field_type(FIELD *field, FIELDTYPE *type, ...); + /* predefined field types */ + FIELDTYPE *TYPE_ALNUM; + FIELDTYPE *TYPE_ALPHA; + FIELDTYPE *TYPE_ENUM; + FIELDTYPE *TYPE_INTEGER; + FIELDTYPE *TYPE_NUMERIC; + FIELDTYPE *TYPE_REGEXP; + FIELDTYPE *TYPE_IPV4; --
- 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: + +
+ By default, no validation is done on form fields. You can associate a + form with with a field type, making the form library validate input. + + +
+ Returns a pointer to the field's argument block. The argument block is + an opaque structure containing a copy of the arguments provided in a + set_field_type call. + + +
+ Returns a pointer to the field type associated with the form field, + i.e., by calling set_field_type. + + +
+ 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 a - third (char **) argument pointing 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 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. + 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 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. TYPE_INTEGER - Integer data, parsable to an integer by atoi(3). - Requires a third int argument controlling the preci- - sion, 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 formatted 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. + 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 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). TYPE_NUMERIC - Numeric data (may have a decimal-point part). - Requires a third int argument controlling the preci- - sion, 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. + 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 + 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(3). TYPE_REGEXP - Regular expression data. Requires a regular expres- - sion (char *) third argument; the data is valid if - the regular expression matches it. Regular expres- - sions 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]*$" - always means that you have to fill all eight posi- - tions with digits. If you want to allow fewer digits, - you may use for example "^[0-9]* *$" which is good - for trailing spaces (up to an empty field), or "^ - *[0-9]* *$" which is good for leading and trailing - spaces around the digits. + Regular expression data. Required parameter: + + o a third argument, a regular expression (char *) string. The + data is valid if the regular expression matches it. + + Regular expressions are in the format of regcomp and regexec. + + The regular expression must match the whole field. If you have + for example, an eight character wide field, a regular expression + "^[0-9]*$" 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 vali- - dated. Please note that this is an ncurses extension. - This field type may not be available in other curses - implementations. + An Internet Protocol Version 4 address. Required parameter: - It is possible to set up new programmer-defined field - types. See the form_fieldtype(3x) manual page. + 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. --
- The functions field_type and field_arg return NULL on - error. The function set_field_type returns one of the fol- - lowing: + +
+ 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). + System error occurred (see errno(3)). --
- curses(3x), form(3x), form_variables(3x). +
+ curses(3x), form(3x), form_fieldtype(3x), form_variables(3x). --
- The header file <form.h> automatically includes the header - file <curses.h>. +
+ The header file <form.h> automatically includes the header file + <curses.h>. --
- These routines emulate the System V forms library. They - were not supported on Version 7 or BSD versions. +
+ These routines emulate the System V forms library. They were not + supported on Version 7 or BSD versions. --
- Juergen Pfeifer. Manual pages and adaptation for new - curses by Eric S. Raymond. +
+ Juergen Pfeifer. Manual pages and adaptation for new curses by Eric S. + Raymond. - form_field_validation(3x) +ncurses 6.4 2023-07-01 form_field_validation(3x)-