release/src/router/libncurses/doc/html/man/form_field_validation.3x.html

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  39 <H1>form_field_validation 3x</H1>
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  41 <PRE>
  42 <!-- Manpage converted by man2html 3.0.1 -->
  43 <STRONG><A HREF="form_field_validation.3x.html">form_field_validation(3x)</A></STRONG>                     <STRONG><A HREF="form_field_validation.3x.html">form_field_validation(3x)</A></STRONG>
  44
  45
  46
  47
  48 </PRE>
  49 <H2>NAME</H2><PRE>
  50        <STRONG>form_field_validation</STRONG> - data type validation for fields
  51
  52
  53 </PRE>
  54 <H2>SYNOPSIS</H2><PRE>
  55        <STRONG>#include</STRONG> <STRONG>&lt;form.h&gt;</STRONG>
  56        int set_field_type(FIELD *field, FIELDTYPE *type, ...);
  57        FIELDTYPE *field_type(const FIELD *field);
  58        void *field_arg(const FIELD *field);
  59
  60        FIELDTYPE *TYPE_ALNUM;
  61        FIELDTYPE *TYPE_ALPHA;
  62        FIELDTYPE *TYPE_ENUM;
  63        FIELDTYPE *TYPE_INTEGER;
  64        FIELDTYPE *TYPE_NUMERIC;
  65        FIELDTYPE *TYPE_REGEXP;
  66        FIELDTYPE *TYPE_IPV4;
  67
  68
  69 </PRE>
  70 <H2>DESCRIPTION</H2><PRE>
  71        The  function  <STRONG>set_field_type</STRONG>  declares  a data type for a
  72        given form field.  This is the type checked by  validation
  73        functions.  The predefined types are as follows:
  74
  75        TYPE_ALNUM
  76             Alphanumeric  data.  Requires a third <STRONG>int</STRONG> argument, a
  77             minimum field width.
  78
  79        TYPE_ALPHA
  80             Character data.  Requires a  third  <STRONG>int</STRONG>  argument,  a
  81             minimum field width.
  82
  83        TYPE_ENUM
  84             Accept one of a specified set of strings.  Requires a
  85             third <STRONG>(char</STRONG> <STRONG>**)</STRONG> argument pointing to a string list; a
  86             fourth  <STRONG>int</STRONG> flag argument to enable case-sensitivity;
  87             and a fifth <STRONG>int</STRONG> flag argument  specifying  whether  a
  88             partial  match  must be a unique one (if this flag is
  89             off, a prefix matches the first of any  set  of  more
  90             than  one  list  elements  with  that prefix). Please
  91             notice that the string list is copied. So you may use
  92             a  list  that  lives  in  automatic  variables on the
  93             stack.
  94
  95        TYPE_INTEGER
  96             Integer data, parsable  to  an  integer  by  <STRONG>atoi(3)</STRONG>.
  97             Requires  a third <STRONG>int</STRONG> argument controlling the preci-
  98             sion, a fourth  <STRONG>long</STRONG>  argument  constraining  minimum
  99             value,  and  a fifth <STRONG>long</STRONG> constraining maximum value.
 100             If the maximum value is less than  or  equal  to  the
 101             minimum value, the range is simply ignored. On return
 102             the field buffer is formatted according to the <STRONG>printf</STRONG>
 103             format   specification   ".*ld",  where  the  '*'  is
 104             replaced by the precision argument.  For  details  of
 105             the precision handling see <STRONG>printf's</STRONG> man-page.
 106
 107        TYPE_NUMERIC
 108             Numeric   data   (may  have  a  decimal-point  part).
 109             Requires a third <STRONG>int</STRONG> argument controlling the  preci-
 110             sion,  a  fourth <STRONG>double</STRONG> argument constraining minimum
 111             value, and a fifth <STRONG>double</STRONG> constraining maximum value.
 112             If  your  system  supports locales, the decimal point
 113             character to be used must be  the  one  specified  by
 114             your  locale.   If  the maximum value is less than or
 115             equal to the  minimum  value,  the  range  is  simply
 116             ignored.  On  return  the  field  buffer is formatted
 117             according to the <STRONG>printf</STRONG> format  specification  ".*f",
 118             where  the '*' is replaced by the precision argument.
 119             For details of the precision  handling  see  <STRONG>printf's</STRONG>
 120             man-page.
 121
 122        TYPE_REGEXP
 123             Regular  expression data.  Requires a regular expres-
 124             sion <STRONG>(char</STRONG> <STRONG>*)</STRONG> third argument; the data  is  valid  if
 125             the  regular  expression matches it.  Regular expres-
 126             sions are in  the  format  of  <STRONG>regcomp</STRONG>  and  <STRONG>regexec</STRONG>.
 127             Please  notice that the regular expression must match
 128             the whole field. If you have  for  example  an  eight
 129             character wide field, a regular expression "^[0-9]*$"
 130             always means that you have to fill  all  eight  posi-
 131             tions with digits. If you want to allow fewer digits,
 132             you may use for example "^[0-9]* *$"  which  is  good
 133             for  trailing  spaces  (up  to an empty field), or "^
 134             *[0-9]* *$" which is good for  leading  and  trailing
 135             spaces around the digits.
 136
 137        TYPE_IPV4
 138             An Internet Protocol Version 4 address. This requires
 139             no additional argument. It is checked whether or  not
 140             the  buffer  has  the form a.b.c.d, where a,b,c and d
 141             are numbers between 0 and 255. Trailing blanks in the
 142             buffer  are  ignored. The address itself is not vali-
 143             dated. Please note that this is an ncurses extension.
 144             This  field type may not be available in other curses
 145             implementations.
 146
 147        It is possible to  set  up  new  programmer-defined  field
 148        types.  See the <STRONG><A HREF="form_fieldtype.3x.html">form_fieldtype(3x)</A></STRONG> manual page.
 149
 150
 151 </PRE>
 152 <H2>RETURN VALUE</H2><PRE>
 153        The  functions  <STRONG>field_type</STRONG>  and  <STRONG>field_arg</STRONG>  return <STRONG>NULL</STRONG> on
 154        error. The function <STRONG>set_field_type</STRONG> returns one of the fol-
 155        lowing:
 156
 157        <STRONG>E_OK</STRONG> The routine succeeded.
 158
 159        <STRONG>E_SYSTEM_ERROR</STRONG>
 160             System error occurred (see <STRONG>errno</STRONG>).
 161
 162
 163 </PRE>
 164 <H2>SEE ALSO</H2><PRE>
 165        <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="form.3x.html">form(3x)</A></STRONG>, <STRONG><A HREF="form_variables.3x.html">form_variables(3x)</A></STRONG>.
 166
 167
 168 </PRE>
 169 <H2>NOTES</H2><PRE>
 170        The header file <STRONG>&lt;form.h&gt;</STRONG> automatically includes the header
 171        file <STRONG>&lt;curses.h&gt;</STRONG>.
 172
 173
 174 </PRE>
 175 <H2>PORTABILITY</H2><PRE>
 176        These routines emulate the System V forms  library.   They
 177        were not supported on Version 7 or BSD versions.
 178
 179
 180 </PRE>
 181 <H2>AUTHORS</H2><PRE>
 182        Juergen  Pfeifer.   Manual  pages  and  adaptation for new
 183        curses by Eric S. Raymond.
 184
 185
 186
 187                                               <STRONG><A HREF="form_field_validation.3x.html">form_field_validation(3x)</A></STRONG>
 188 </PRE>
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