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100 lines
4.3 KiB
Plaintext
100 lines
4.3 KiB
Plaintext
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'\" t
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.TH form_field_validation 3X ""
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.SH NAME
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\fBform_field_validation\fR - data type validation for fields
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.SH SYNOPSIS
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\fB#include <form.h>\fR
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.br
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int set_field_type(FIELD *field, FIELDTYPE *type, ...);
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.br
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FIELDTYPE *field_type(const FIELD *field);
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.br
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void *field_arg(const FIELD *field);
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.br
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.SH DESCRIPTION
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The function \fBset_field_type\fR declares a data type for a given form field.
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This is the type checked by validation functions. The types are as follows:
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.TP 5
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TYPE_ALNUM
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Alphanumeric data. Requires a third \fBint\fR argument, a minimum field width.
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.TP 5
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TYPE_ALPHA
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Character data. Requires a third \fBint\fR argument, a minimum field width.
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.TP 5
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TYPE_ENUM
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Accept one of a specified set of strings. Requires a third \fB(char **)\fR
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argument pointing to a string list; a fourth \fBint\fR flag argument to enable
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case-sensitivity; and a fifth \fBint\fR flag argument specifying whether a partial
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match must be a unique one (if this flag is off, a prefix matches the first
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of any set of more than one list elements with that prefix). Please notice
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that the string list is not copied, only a reference to it is stored in the
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field. So you should avoid to use a list that lives in automatic variables
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on the stack.
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.TP 5
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TYPE_INTEGER
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Integer data, parsable to an integer by \fBatoi(3)\fR. Requires a third
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\fBint\fR argument controlling the precision, a fourth \fBlong\fR argument
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constraining minimum value, and a fifth \fBlong\fR constraining maximum value.
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If the maximum value is less or equal the minimum value, the range is simply
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ignored. On return the field buffer is formatted according to the \fBprintf\fR
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format specification ".*ld", where the '*' is replaced by the precision argument.
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For details of the precision handling see \fBprintf's\fR man-page.
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.TP 5
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TYPE_NUMERIC
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Numeric data (may have a decimal-point part). Requires a third
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\fBint\fR argument controlling the precision, a fourth \fBdouble\fR
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argument constraining minimum value, and a fifth \fBdouble\fR constraining
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maximum value. If your system supports locale's, the decimal point character
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to be used must be the one specified by your locale.
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If the maximum value is less or equal the minimum value, the range is simply
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ignored. On return the field buffer is formatted according to the \fBprintf\fR
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format specification ".*f", where the '*' is replaced by the precision argument.
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For details of the precision handling see \fBprintf's\fR man-page.
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.TP 5
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TYPE_REGEXP
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Regular expression data. Requires a regular expression \fB(char *)\fR third argument;
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the data is valid if the regular expression matches it. Regular expressions
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are in the format of \fBregcomp\fR(3x) and \fBregexec\fR(3X). Please notice
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that the regular expression must match the whole field. If you have for
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example an eight character wide field, a regular expression "^[0-9]*$" always
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means that you have to fill all eight positions with digits. If you want to
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allow fewer digits, you may use for example "^[0-9]* *$" which is good for
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trailing spaces (up to an empty field), or "^ *[0-9]* *$" which is good for
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leading and trailing spaces around the digits.
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.TP 5
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TYPE_IPV4
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An Internet Protocol Version 4 address. This requires no additional argument. It
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is checked whether or not the buffer has the form a.b.c.d, where a,b,c and d are
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numbers between 0 and 255. Trailing blanks in the buffer are ignored. The address
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itself is not validated. Please note that this is an ncurses extension. This
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field type may not be available in other curses implementations.
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It is possible to set up new programmer-defined field types. See the
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\fBform_fieldtype\fR(3X) manual page.
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.SH RETURN VALUE
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The functions \fBfield_type\fR and \fBfield_arg\fR return \fBNULL\fR on
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error. The function \fBset_field_type\fR returns one of the following:
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.TP 5
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\fBE_OK\fR
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The routine succeeded.
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.TP 5
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\fBE_SYSTEM_ERROR\fR
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System error occurred (see \fBerrno\fR).
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.SH SEE ALSO
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\fBcurses\fR(3X), \fBform\fR(3X).
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.SH NOTES
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The header file \fB<form.h>\fR automatically includes the header file
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\fB<curses.h>\fR.
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.SH PORTABILITY
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These routines emulate the System V forms library. They were not supported on
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Version 7 or BSD versions.
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.SH AUTHORS
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Juergen Pfeifer. Manual pages and adaptation for new curses by Eric
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S. Raymond.
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.\"#
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.\"# The following sets edit modes for GNU EMACS
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.\"# Local Variables:
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.\"# mode:nroff
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.\"# fill-column:79
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.\"# End:
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